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Unprecedented Warming Revealed from Multi-proxy Reconstruction of Temperature in Southern China for the Past 160 Years

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Advances in Atmospheric Sciences 2017年第8期34卷 977-982页

作者： Yang LIU Jingyun ZHENG Zhixin HAO Xuezhen ZHANG Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China

Using the southern limit of snowfall recorded in Chinese documents, chronologies of tree-ring width, and tree-ring stable oxygen isotope（δ^（18）O）, the annual temperature anomaly in southern China during 1850–2009 is reconstructed using the method of signal decomposition and synthesis. The results show that the linear trend was 0.47℃（100 yr）^（-1）over 1871–2009,and the two most rapid warming intervals occurred in 1877–1938 and 1968–2007, at rates of 0.125℃（10 yr）^（-1）and 0.258℃（10 yr）^（-1）, respectively. The decadal variation shows that the temperature in the moderate warm interval of the 1910s–1930s was notably lower than that of the 1980s–2000s, which suggests that the warming since the 1980s was unprecedented for the past 160 years, though a warming hiatus existed in the 2000s. Additionally, there was a rapid cooling starting from the 1860s,followed by a cold interval until the early 1890s, with the coldest years in 1892 and 1893. A slight temperature decline was also found from the 1940s to the late 1960s. This study provides an independent case to validate the global warming for the past 160 years and its hiatus recently, because the proxy data are not affected by urbanization.

关键词： centennial warming temperature reconstruction multi-proxy southern China

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Revealing climatic impacts on the temporal and spatial variation in vegetation activity across China:Sensitivity and contribution

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Advances in Climate Change Research 2021年第3期12卷 409-420页

作者： JIAO Ke-Wei GAO Jiang-Bo LIU Zhi-Hua WU Shao-Hong Tamara L.FLETCHER Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang110016China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China

Relative weakness in sensitivity and contribution integration,especially lack of specific indicators at spatial and temporal scales,may hinder the formation of systematic knowledge for climate change impact on vegetation *** the interannual variability and periods difference,we investigated the ecosystem sensitivity to hydrothermal conditions and the contribution of individual climatic factors to vegetation activity on spatiotemporal scales during the period of 1980s—2013 in *** ran simulations of the Common land Model(CoLM)to obtain the photosynthetic rate,and used the satellite-derived Normalized Difference Vegetation Index(NDVI),to which we applied a temporal sensitivity analysis,the slope change ratio of accumulative quantity(SCRAQ),and geographical *** show that the discrepancy between warming and precipitation variation contributed to vegetation activity was more notable than the ecosystem sensitivity to hydrothermal conditions,regardless of which temporal and spatial scale was *** sensitivity of vegetation activity to hydrothermal variation in most parts of northeastern and western China was higher than elsewhere,and the contribution of warming to vegetation dynamics was relatively high in the Inner Mongolian Plateau and Tibetan Plateau(>60%),where the contribution of warming to the vegetation distribution was also greater than elsewhere in ***,the contribution of precipitation variation to vegetation dynamics was comparatively greater in northwestern China and subtropical and tropical regions(>55%).The spatiotemporal contribution of precipitation variation to vegetation activity differed between regions,especially on the Tibetan Plateau and in subtropical and tropical ***,both the temporal and spatial sensitivities to climate change were weak in the subtropical and tropical regions,where the contribution of climatic factors to vegetation distribution was also ***,temperature sensit

关键词： Vegetation activity Climate change Sensitivity Contribution Spatial-temporal scales China

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Ecological changes and the tradeoff and synergy of ecosystem services in western China

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Journal of Geographical Sciences 2022年第6期32卷 1059-1075页

作者： NIU Linan SHAO Quanqin NING Jia HUANG Haibo Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Since the implementation of the Development of Western Regions in 2000,a series of major ecological construction projects have been implemented,leading to a series of changes in the ecological conditions and ecological services of western *** study calculated the amount of ecosystem services in total in the western region from 2000 to 2019,and analyzed ecological changes and the characteristics of spatio-temporal variations in ecological services.A relevant analysis method was applied to explore the tradeoff and synergy of *** was found that the area of settlements and wetland ecosystems in the western region increased significantly from 2000 to 2015,whereas grassland showed a downward trend year by *** vegetation fraction showed a decreasing belt-like distribution from south to *** showed a fluctuating increase during 2000 to 2019,with inter-annual and large spatial *** water conservation service(WCS)had a slight downward trend from 2000 to 2019,and the main decreasing areas were distributed in southeastern Tibet,the western part of the Three Rivers Source region,and the karst rocky desertification *** soil conservation service(SCS)showed an increasing but fluctuating trend,with the greatest increases observed in the Loess Plateau region,western Sichuan and Yunnan,northwest Tibet,and southeast *** windbreak and sand fixation service(SFS)showed a downward trend,and the sharp decline was mainly in the central and western parts of Inner Mongolia,Tibet and parts of northern *** supply and WCS,and SCS were mainly synergistic,which were found in areas north of the Qinling Mountains-Huaihe River(QM-HR)line,especially in Ningxia and Inner *** supply was mainly tradeoffs with SFS,and it was found in the agriculture-pastoral transition *** synergistic degree of ecosystem services in areas subjected to ecological engineering policy was greater than that in non-engineering *** asse

关键词： ecosystem services tradeoff and synergy western region Western Development Strategy

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China's agricultural land use change and its underlying drivers:A literature review

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Journal of Geographical Sciences 2021年第8期31卷 1222-1242页

作者： WANG Xue LI Xiubin Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Understanding the manifestations and underlying drivers of agricultural land use change in China is of great importance for both domestic and global food security. However, little is known about the holistic pattern of agricultural land use change across China, especially from the perspective of intensity since the evidence has been gathered mainly through case studies at local levels. This study conducts a systemic review of agricultural land use change and its underlying drivers in China by aggregating 169 relevant case studies from 123 publications. The cases related to intensification and disintensification, which are the two types of agricultural land use change, are generally equal, accounting for 50% of the total number of cases. Intensification and disintensification can be further divided into the same three categories: expansion/contraction of agricultural land, changes in agricultural land use activities and changes in land management intensity. Demographic, economic, technological, and institutional drivers, together with location factors, are frequently noted as significant underlying drivers, while sociocultural drivers and farm(er) characteristics are less frequently recognized. Finally, three major land use change trajectories are summarized mainly concerning rising labor costs and the concomitant increase in off-farm employment, the ecological improvement policy, and advances in agricultural technology.

关键词： agricultural land land use intensity driving forces aggregate analysis China

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Contributions of climate change to cereal yields in Tibet, 1993–2017

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Journal of Geographical Sciences 2022年第1期32卷 101-116页

作者： DING Rui SHI Wenjiao Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Climate change is a global environmental crisis, but there have been few studies of the effects of climate change on cereal yields on the Tibetan Plateau. We used data from meteorological stations and statistical yearbooks to assess the impacts of climate change on cereal yields in Tibet. Three types of statistical models were selected: fixed-effects model, first-difference models, and linear detrending models. We analyzed the impacts of climate change(including the minimum temperature, precipitation, growing degree days and solar radiation) on cereal yields in Tibet from 1993 to 2017 at the county, prefecture-level city, and autonomous region scales. The results showed that the sensitivity of cereal yields in Tibet to temperature(minimum temperature and growing degree days) was greater than their sensitivity to precipitation and solar radiation. The joint impacts of climate variables were positive, but the sensitivity and significance varied in different regions. The impacts of minimum temperature, precipitation, and solar radiation were positive in all cities, apart from the negative impacts of growing degree days on cereal yields in Lhasa. The impacts of climate trends on cereal yields in Tibet were positive and the results were in the range of 1.5%–4.8%. Among the three types of model, the fixed-effects model was the most robust and the linear detrending model performed better than the first-difference model. The robustness of the first-difference model decreased after adding the interaction terms between different climate variables. Our findings will help in implementing more spatially targeted agricultural adaptations to cope with the impacts of climate change on the agro-ecosystem of the Tibetan Plateau.

关键词： Tibetan Plateau climate change statistical model cereal yields

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Changes and determining factors of crop evapotranspiration derived from satellite-based dual crop coefficients in North China Plain

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The Crop Journal 2022年第5期10卷 1496-1506页

作者： Qinghua Tan Yujie Liu Tao Pan Xianfang Song Xiaoyan Li Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China

Evaluating actual crop evapotranspiration(ET) variations and their determining factors under changing climates is crucial for agricultural irrigation management and crop productivity improvement in nonhumid *** study analyzed the spatiotemporal characteristics and detected the determining factors of ETfor winter wheat and summer maize rotation system from 2000 to 2017 in the North China Plain(NCP),by combining the FAO-56 dual crop coefficient approach with remotely sensed vegetation indices(VIs).The results indicated that daily air temperature increased in varying degrees while wind speed and sunshine hours decreased slightly during the growing season of winter wheat and summer maize over the study *** trends of relative humidity and effective precipitation varied in crop growing *** on the validated relationship of dual crop coefficients and VIs,the estimated multi-year average ETof winter wheat(370.29±31.28 mm) was much higher than summer maize(281.85±20.14 mm),and the rotation cycle was 652.43±27.67 *** ETof winter wheat and the rotation cycle increased by 2.96 mm aand 1,77 mm a,***,the ETof summer maize decreased with distinct spatial ***,winter wheat ETincreased significantly in the northeast NCP,covering the Beijing-Tianiin-Hebei ***,significant increases in summer maize ETwere detected in the southwest *** sensitivity and contribution analysis showed that ETof winter wheat and summer maize was positively sensitive to temperature,wind speed,and sunshine hours while negatively to relative ***,wind speed and sunshine hours contributed most to changes in ET(around 20%-40%).

关键词： Actual crop evapotranspiration Determining factor North China Plain Rotation system Spatiotemporal variation

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Spatio-temporal characteristics of soil protection efforts of the Grain for Green Project in northern Shaanxi Province

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Journal of Geographical Sciences 2020年第3期30卷 401-422页

作者： LIU Wenchao LIU Jiyuan KUANG Wenhui Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China School of Geographic and Environmental Sciences Tianjin Normal UniversityTianjin 300387China

This paper looks at the Green for Grain Project in northern Shaanxi *** on remote sensing monitoring data,this study analyzes the locations of arable land in northern Shaanxi in the years 2000,2010 and 2013 as well as spatio-temporal changes over that period,and then incorporates data on the distribution of terraced fields to improve the input parameters of a RUSLE model and simulate and generate raster data on soil erosion for northern Shaanxi at different stages with a accuracy ***,combined with the dataset of farmland change,compared and analyzed the characteristics of soil erosion change in the converted farmland to forest(grassland)and the unconverted farmland in northern Shaanxi,so as to determine the project’s impact on soil erosion over time across the *** results show that between 2000 and 2010,the soil erosion modulus of repurposed farmland in northern Shaanxi decreased 22.7 t/ha,equivalent to 47.08%of the soil erosion modulus of repurposed farmland in *** the same period,the soil erosion modulus of non-repurposed farmland fell 10.99 t/ha,equivalent to 28.6%of the soil erosion modulus of non-repurposed farmland in *** soil erosion modulus for all types of land in northern Shaanxi decreased by an average of 14.51 t/ha between 2000 and 2010,equivalent to 41.87%of the soil erosion modulus for the entire region in *** suggests that the Green for Grain Project effectively reduced the soil erosion modulus,thus helping to protect the *** particular,arable land that was turned into forest and grassland reduced erosion most noticeably and contributed most to soil ***,in the period 2010 to 2013,which was a period of consolidation of the Green for Grain Project,the soil erosion modulus and change in volume of soil erosion in northern Shaanxi were significantly lower than in the previous decade.

关键词： northern Shaanxi converting farmland into forest and grassland remote sensing RUSLE soil erosion soil conservation

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A combined process coupling phytoremediation and in situ flushing for removal of arsenic in contaminated soil

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Journal of Environmental Sciences 2017年第7期29卷 104-109页

作者： Xiulan Yan Qiuxin Liu Jianyi Wang Xiaoyong Liao Beijing Key Laboratory of Environmental Damage Assessment and Remediation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Phytoremediation and soil washing are both potentially useful for remediating arsenic（As）-contaminated *** evaluated the effectiveness of a combined process coupling phytoremediation and in situ soil flushing for removal of As in contaminated soil through a pilot *** results showed that growing Pteris vittata L.（P.v.） accompanied by soil flushing of phosphate（P.v./Flushing treatment） could significantly decrease the total As concentration of soil over a 37 day flushing period compared with the single flushing（Flushing treatment）.The P.v./Flushing treatment removed 54.04% of soil As from contaminated soil compared to 47.16% in Flushing treatment,suggesting that the growth of *** was beneficial for promoting the removal *** analyzed the As fractionation in soil and As concentration in soil solution to reveal the mechanism behind this combined *** showed that comparing with the control treatment,the percent of labile arsenate fraction significantly increased by 17% under P.v./Flushing *** concentration in soil solution remained a high lever during the middle and later periods（51.26–56.22 mg/L）,which was significantly higher than the Flushing *** soil flushing of phosphate for more than a month,*** still had good accumulation and transfer capacity of As of the *** results of the research revealed that combination of phytoremediation and in situ soil flushing is available to remediate As-contaminated soils.

关键词： Arsenic Soil flushing Phytoremediation Pteris vittata L. Phosphate

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Climatic and Biotic Controls of Evapotranspiration Across Grassland Ecosystems on the Tibetan Plateau

SSRN

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SSRN 2025年

作者： Peng, Siyuan Yang, Yue Luo, Dengnan Zeng, Xiang Liang, Minqi Tao, Long Zhang, Guangru Li, Pan Liao, Weijie Guo, Qun Cao, Ruochen Li, Yuzhe Zhang, Weirong Hu, Zhongmin Hainan Baoting Tropical Rainforest Ecosystem Observation and Research Station School of Ecology Hainan University Haikou570228 China Department of Geography Faculty of Arts and Sciences Beijing Normal University Zhuhai519087 China Facility of Geographical Science Beijing Normal University Beijing100875 China Zhuhai Branch of State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Zhuhai519087 China School of Geography South China Normal University Shipai Campus Guangzhou510631 China School of Atmospheric Sciences Guangdong Province Data Center of Terrestrial and Marine Ecosystems Carbon Cycle Sun Yat-sen University Guangdong Zhuhai510245 China Key Lab of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing101408 China International Institute for Earth System Sciences Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing University Jiangsu210023 China Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural Resources School of Geography and Ocean Science Nanjing University Jiangsu210023 China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China

Study region: The Tibetan Plateau in China, the Third Pole of the *** focus: Accurate descriptions of spatial variation in evapotranspiration (ET) and its components on the Tibetan Plateau (TP) are crucial for understanding the dynamics of the regional water cycle and energy balance. However, how various environmental factors affect ET and its components remains unclear. This study addresses this gap using observational data from 14 sites and employing the Shuttleworth-Wallace-Hu (SWH) model to examine the spatial relationships between ET, its components, and underlying *** hydrological insights for the region: The SWH model parameters were optimized using the Monte Carlo method, achieving a satisfactory model performance with an average R² of 0.75. The ratio of transpiration to ET was generally higher in alpine meadows (0.55) than alpine steppes (0.39). Across the TP, precipitation and the leaf area index together shaped spatial variation in ET and transpiration. Precipitation emerged as the primary driver of interannual variation in ET, while the leaf area index strongly regulated the proportion of ET accounted for by transpiration. Furthermore, above aridity index values of 0.73, grassland ecosystems transitioned from water to energy. This finding is significant as it challenges the common application of an aridity index value of 0.65 to distinguish arid from humid regions. It suggests that TP grasslands, with an AI of 0.65-0.73, remain primarily water-limited. © 2025, The Authors. All rights reserved.

关键词： Monte Carlo methods

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Soil organic carbon dynamics in Xilingol grassland of northern China induced by the Beijing-Tianjin Sand Source Control Program

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Frontiers of Earth Science 2017年第2期11卷 407-415页

作者： Liangxia ZHANG Wei CAO Jiangwen FAN Jiangsu Key Laboratory of Agricultural Meteorology and College of Applied Meteorology Nanjing University of Information Science and Technology Nanjing 210044 China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

To mitigate impacts of sandstorms on northern China, the Chinese government launched the Beijing- Tianjin Sand Source Control Program （BTSSCP） in 2000. The associated practices （i.e., cultivation, enclosure, and aerial seeding） were expected to greatly enhance grassland carbon sequestration. However, the BTSSCP-induced soil organic carbon （SOC） dynamics remain elusive at a regional level. Using the Xilingol League in Inner Mongolia for a case study, we examined the impacts from 2000 to 2006 of the BTSSCP on SOC stocks using the IPCC carbon budget inventory method. Results indicated that over all practices SOC storage increased by 1.7%, but there were large differences between practices. SOC increased most rapidly at the rate of 0.3 Mg ***-1 ＂yr-1 under cultivation, but decreased signifi- cantly under aerial seeding with moderate or heavy grazing （0.3 vs.0.6 Mg C-ha-I .yr-1）. SOC increases varied slightly for grassland types, ranging from 0.10 Mg C-ha-1 .yr-a for temperate desert steppe to 0.16 Mg ***-1 for temperate meadow steppe and lowland meadow. The overall economic benefits of the SOC sink were estimated to be 4.0 million CNY. Aerial seeding with no grazing was found to be the most cost-effective practice. Finally, we indicated that at least 55.5 years （shortest for cultivation） were needed for the grasslands to reach their potential carbon stocks. Our findings highlight the importance and effectiveness of BTSSCP in promoting terrestrial carbon sequestration which may help mitigate climate change, and further stress the need for more attention to the effective- ness of specific practices.

关键词： grassland carbon sequestration ecologicalrestoration Beijing-Tianjin Sand Source Control Program（BTSSCP） IPCC carbon budget inventory method

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