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Weakened maize phenological response to climate warming in China over 1981‒2018 due to cultivar shifts

Advances in Climate Change Research 2022年第5期13卷 710-720页

作者： Yu-Chuan LUO Zhao ZHANG Liang-Liang ZHANG Jing ZHANG Fu-Lu TAO Academy of Disaster Reduction and Emergency Management Ministry of Emergency Management&Ministry of Education School of National Safety and Emergency ManagementBeijing Normal UniversityBeijing 100875China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101 China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049 China Natural Resources Institute Finland(Luke) Helsinki 00790Finland

Assessing climate change impacts on crop phenology is essential for developing adaptation *** better understand crop response and adaptation to climate change,there is an urgent need to investigate whether the impacts weakens and how crops responds to recent climate warming,as well as the roles of different drivers in crop phenology ***,we analyzed the spatiotemporal changes in maize phenology and the underlying mechanisms over 1981–2018 using up-to-date 6106 phenological observations at 327 agro-meteorological stations in *** found that during 1981–2018 maize sowing and maturity dates were generally delayed by 0.6 and 1.2 d per decade,respectively,whereas heading date was advanced by 0.9 d per *** phenology was most negatively correlated with rising minimum temperature(night-time warming),followed by maximum(daytime)temperature,and least by mean *** trends in maize phenology and the correlation between growth periods and temperature generally declined from 1981 to 1999 to 2000–2018 for both spring and summer maize,although climate warming during growth period did not slow *** phenological response to temperature weakened mainly owing to agricultural managements,especially cultivar *** change shortened growth period by 3.4 and 1.7 d per decade but cultivar shifts prolonged it by 4.5 and 2.1 d per decade for spring and summer maize,*** study highlights that maize phenology is more sensitive to night-time warming than daytime warming,and cultivar shifts far outweigh climate *** findings foster the understanding of spatiotemporal dynamics of maize phenology and its drivers,which can benefit to develop effective climate change adaptation options for different regions.

关键词： Maize Climate change Phenology Adaptation Cultivars shift

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Identification of Dominant Climate Variables on Spatiotemporal Variation in Reference Evapotranspiration on the Loess Plateau,China

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Chinese Geographical Science 2022年第4期32卷 620-642页

作者： LI Xiaofei LIANG Wei JIAO Lei YAN Jianwu ZHANG Weibin WANG Fengjiao GOU Fen WANG Chengxi SHAO Quanqin School of Geography and Tourism Shaanxi Normal UniversityXi’an 710119China National Demonstration Center for Experimental Geography Education Shaanxi Normal UniversityXi’an 710119China Xi’an Gu Bo Electronic Intelligent Technology Co. LtdXi’anChina Key Laboratory of Terrestrial Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Reference evapotranspiration(ET_(0))is a vital component in hydrometeorological research and is widely applied to various aspects,such as water resource management,hydrological modeling,irrigation deployment,and understanding and predicting the influence of hydrologic cycle variations on future climate and land use *** the influence of various meteorological variables on ET_(0) is not only helpful for predicting actual evapotranspiration but also has important implications for understanding the impact of global climate change on regional water *** on daily data from 69 meteorological stations,the present study analyzed the spatiotemporal pattern of ET_(0) and major contributing meteorological variables to ET_(0) from 1960 to 2017 by the segmented re-gression model,Mann-Kendall test,wavelet analysis,generalized linear model,and detrending *** results showed that the annual ET_(0) declined slightly because of the combined effects of the reduction in solar radiation and wind speed and the increase in vapor pressure deficit(VPD)and average air temperature in the Loess Plateau(LP)during the past 58 *** change points were detected in 1972,1990,1999,and 2010,and the annual ET_(0) showed a zigzag change trend of‘increasing-decreasing-increasing-decreasing-increasing’.Wind speed and VPD played a leading role in the ET_(0) changes from 1960 to 1990 and from 1991 to 2017,*** study confirms that the dominant meteorological factors affecting ET_(0) had undergone significant changes due to global climate change and vegetation greening in the past 58 years,and VPD had become the major factor controlling the ET_(0) changes on the *** data presented herein will contribute to increasing the accuracy of predictions on future changes in ET_(0).

关键词： reference evapotranspiration(ET0) change points generalized linear model dominant factors vapor pressure deficit(VPD) Loess Plateau(LP)

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Possible NPP changes and risky ecosystem region identification in China during the 21st century based on BCC-CSM2

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Journal of Geographical Sciences 2020年第8期30卷 1219-1232页

作者： ZHANG Chi WU Shaohong LENG Guoyong Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China

Based on simulations by the Beijing Climate Center climate system model version 2(BCC-CSM2), the possible changes in net primary productivity (NPP) of the terrestrial ecosystemin China during the 21st century are explored under the Shared SocioeconomicPathway 2 (SSP2) 4.5 scenario. We found both the near-term and long-term terrestrial NPPbasically shows a unanimously increasing trend, which indicates low ecosystem productivityrisk in the future. However, the simple linear regression is insufficient to characterize thelong-term variation of NPP. Using the piecewise linear regression approach, we identify adecreasing trend of NPP in large areas for the latter part of the 21st century. In the northeastregion (NER) from east Inner Mongolia to west Heilongjiang province, NPP decreases significantlyafter 2059 at a rate of −0.9% dec-1. In the south region (SR) from Zhejiang toGuangxi provinces, a rapid decline of −2.4% dec-1 is detected after 2085. Further analysisreveals that the rapid decline in SR is primarily attributed to the decrease in precipitation, withtemperature playing a secondary role, while the NPP decline in NER seems to have no evidentrelations with climate change. These findings are useful for making preparations forpotential ecosystem crisis in China in the future.

关键词： climate change NPP ecosystem risk turning point SSP245

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Multi-scale temperature variations and their regional differences in China during the Medieval Climate Anomaly

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Journal of Geographical Sciences 2020年第1期30卷 119-130页

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

The Medieval Climate Anomaly(MCA,AD950-1250)is the most recent warm period lasting for several hundred years and is regarded as a reference scenario when studying the impact of and adaptation to global and regional *** this study,we investigated the characteristics of temperature variations on decadal-centennial scales during the MCA for four regions(Northeast,Northwest,Central-east,and Tibetan Plateau)in China,based on high-resolution temperature reconstructions and related warm-cold records from historical *** ensemble empirical mode decomposition method is used to analyze the time *** results showed that for China as a whole,the longest warm period during the last 2000 years occurred in the 10th-13th centuries,although there were multi-decadal cold intervals in the middle to late 12th ***,in the beginning and ending decades,warm peaks and phases on the decadal scale of the MCA for different regions were not consistent with each *** the inter-decadal scale,regional temperature variations were similar from 950 to 1130;moreover,their amplitudes became smaller,and the phases did not agree well from 1130 to *** the multi-decadal to centennial scale,all four regions began to warm in the early 10th century and experienced two cold intervals during the ***,the Northwest and Central-east China were in step with each other while the warm periods in the Northeast China and Tibetan Plateau ended about 40-50 years *** the multi-centennial scale,the mean temperature difference between the MCA and Little Ice Age was significant in Northeast and Central-east China but not in the Northwest China and Tibetan *** to the mean temperature of the 20th century,a comparable warmth in the MCA was found in the Central-east China,but there was a little cooling in Northeast China;meanwhile,there were significantly lower temperatures in Northwest China and Tibetan Plateau.

关键词： China multi-scale variations temperature Medieval Climate Anomaly

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Cropping patterns for Phenology Stability and Resource Conservation Under Extreme Climates

SSRN

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SSRN 2023年

作者： Ahmad, Aqeel Liu, Yujie Institute of Agricultural Sciences University of the Punjab Punjab Lahore Pakistan Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China

CONTEXTCultivation pattern is the foundation stone of agriculture policy, enabling farmers to perform various farming operations efficiently. In the meantime, with an elevating frequency of extreme climate hits, it is imperative to devise low-cost strategies to anticipate disastrous climates and achieve regional food security even in the regions facing typhoons, floods, and extreme *** primarily aimed to evaluate the crop cultivation patterns, focusing on their intrinsic climate mitigation potential and phenological stability to secure sufficient ***, the study was performed in three phases, (i) crop type evaluation, (ii) cultivation pattern analysis, and (iii) cropping area analysis. In the first phase, the study used the climate data of 1979-2020 with reference to seven crop types (i.e., grains, oilseed, vegetables, beans, peas, nuts, and tubers) and evaluated yield reductions and phenological *** AND CONCLUSIONSThe results showed that tubers and nuts were the most resilient crops to extreme environmental events. Whereas grains (conventional staple crops) and oilseed (the essential food crops) were most vulnerable to extreme climatic hits. Time-course phenological stability was higher in nuts and tubers, which possessed elevated resistance against phenological shifts. In the second phase, intercropping was highlighted as a better cultivation pattern;however, the recommended cultivation pattern was agroforestry due to its significant advantages over alley cropping, forest farming and windbreaks. The third phase recommended incorporating windbreak plants in the perpendicular single-row formation with an inter-row distance of 20 r (r - horizontal radius of the tree canopy).SIGNIFICANCEOverall, the study aligns the fundamental aspects of agroecology with redesigning crop cultivation policies and has global implications in the agricultural systems to mitigate extreme environments and ensure food security. © 2023, The Auth

关键词： Cultivation

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Impact of spatial transfer of farmland on the food-water-GHG nexus in China during 2000–2020

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Resources, Conservation and Recycling 2025年 221卷

作者： Liu, Yunxi Wang, Xue Tan, Minghong Zhang, Fuyao Li, Xiubin Key Laboratory of Land Surface Pattern and Simulation 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 Beijing100049 China

Analyzing the impact of spatial transfer of farmland (STF) on the food-water-greenhouse gases (FWG) nexus through a coupled perspective holds significant scientific value for guiding sustainable farmland management policies. This study developed an integrated assessment framework to quantify FWG-nexus dynamics induced by STF, systematically evaluating changes in crop yields, irrigation water consumption, and GHG emissions across China from 2000 to 2020. The coupling coordination degree (CCD) of the FWG system was further examined. The results show that between 2000 and 2020, the area of farmland in China decreased by 2.63 × 104km2, and the center of gravity of farmland shifted approximately 56.90 km towards the northwest. Nationwide, STF led to an increase in average crop yields by 58.54 kg/ha;at the same time, the average irrigation water consumption increased by 1.93 mm, and the average GHG emissions also rose by 23.63 kgCO2-eq/ha. During the study period, the FWG-nexus exhibited a tendency toward decoupling, as indicated by a 0.21 % decrease in the FWG CCD. The increasing consumption for irrigation water and rising GHG emissions have consistently been the primary constraints to the harmonization of the FWG-nexus at the national level, with notable regional variations of these constraints. These insights help deepen the understanding of the impact of STF on the FWG-nexus, providing scientific support for sustainable land use in China and the achievement of the United Nations Sustainable Development Goals (SDGs). © 2025 Elsevier B.V.

关键词： Greenhouse gas emissions

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Conversion of biochar into sulfonate-bearing solid acids used for the hydrolysis of tylosin:the effect of aromaticity and degree of condensation

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Biochar 2023年第1期5卷 1514-1526页

作者： Qianqian Xie Xiao Yang Binoy Sarkar Xiaomin Dou Piumi Amasha Withana Yong Sik Ok College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083People’s Republic of China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101People’s Republic of China Future Industries Institute University of South AustraliaMawson LakesSA 5095Australia Korea Biochar Research Center APRU Sustainable Waste Management Program&Division of Environmental Science and Ecological EngineeringKorea UniversitySeoul 02841Republic of Korea International ESG Association(IESGA) Seoul 06621Republic of Korea

In the last few decades,sulfonated carbon materials have garnered significant attention as Brøsted solid acid *** sulfonation process and catalytic activity of sulfonated biochar can be influenced by the aromaticity and degree of condensation exhibited by ***,the relationships between the aromaticity,sulfonating ability,and resultant catalytic activity are not fully *** this study,biochar samples pyrolyzed at 300-650℃ exhibiting different aromaticity and degrees of condensation were sulfonated and employed as sulfonate-bearing solid catalysts for hydrolytically removing *** exhibited excellent hydrolytic performance and their kinetic constants were positively correlated with the total acidity and negatively correlated with their *** study has uncovered the relationship between the structure,properties,sulfonating ability,and subsequent hydrolytic performance of biochar *** was observed that the aromaticity of biochar decreased as the pyrolysis temperature *** pyrolysis temperatures resulted in a reduced degree of condensation,smaller ring size,and an increased number of ring edge sites available for sulfonation,ultimately leading to enhanced catalytic *** findings provide valuable insights into the fundamental chemistry behind sulfonation upgrading of biochar,with the aim of developing functional catalysts for mitigating antibiotics in contaminated water.

关键词： Biochar upgrading Sulfonation Hydrolytic mitigation Tylosin removal Biochar-based solid acids

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Disciplinary structure and development strategy of physical geography in China

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Journal of Geographical Sciences 2022年第9期32卷 1642-1653页

作者： CHEN Fahu WU Shaohong LIU Hongyan YANG Xiaoyan LIU Jianbao State Key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchCASBeijing100101China Alpine Paleoecology and Human Adaptation Group(ALPHA) Institute of Tibetan Plateau ResearchCASBeijing100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing100101China College of Urban and Environmental Sciences Peking UniversityBeijing100871China College of Earth and Environmental Sciences Lanzhou UniversityLanzhou730000China

Physical geography,one of the branches of geography,is the basic discipline of geographic *** it is the scientific foundation of ecology,environmental science and other related *** geography focuses on spatial characteristics,evolution and regional differentiation of the earth’s *** the new period of rapid development of social economy,and science and technology,physical geography is more closely and widely connected with human geography and,information *** paper analyzed the forming process of the physical geography,expressed sub-discipline structure of integrated physical geography,sectoral physical geography,human living-environment geography,and proposed the development strategy of physical geography and its sub-branch disciplines,key priority of development goals and directions in China.

关键词： physical geography disciplinary structure development strategy

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Vertical distribution changes in land cover between 1990 and 2015 within the Koshi River Basin,Central Himalayas

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Journal of Geographical Sciences 2021年第10期31卷 1419-1436页

作者： WU Xue PAUDEL Basanta ZHANG Yili LIU Linshan WANG Zhaofeng XIE Fangdi GAO Jungang SUN Xiaomin Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Texas A&M AgriLife Blackland Res&Extens CtrTempleTX 76502USA

The study of mountain vertical natural belts is an important component in the study of regional *** areas are especially sensitive to climate change and have indicative function,which is the core of three-dimensional zonality ***,based on high precision land cover and digital elevation model(DEM)data,and supported by MATLAB and ArcGIS analyses,this paper aimed to study the present situation and changes of the land cover vertical belts between 1990 and 2015 on the northern and southern slopes of the Koshi River Basin(KRB).Results showed that the vertical belts on both slopes were markedly different from one *** vertical belts on the southern slope were mainly dominated by cropland,forest,bare land,and glacier and snow *** contrast,grassland,bare land,sparse vegetation,glacier and snow cover dominated the northern *** found that the main vertical belts across the KRB within this region have not changed substantially over the past 25 *** contrast,on the southern slope,the upper limits of cropland and bare land have moved to higher elevation,while the lower limits of forest and glacier and snow cover have moved to higher *** upper limit of alpine grassland on the northern slope retreated and moved to higher elevation,while the lower limits of glacier and snow cover and vegetation moved northward to higher *** in the vertical belt were influenced by climate change and human activities over *** was mainly controlled by human activities and climate warming,and the reduced precipitation also led to the abandonment of cropland,at least to a certain *** in grassland and forest ecosystems were predominantly influenced by both human activities and climate *** the same time,glacier and snow cover far away from human activities was also mainly influenced by climate warming.

关键词： vertical belt land cover Central Himalayas Koshi River Basin climate change

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Reconstruction of cropland area in the European part of Tsarist Russia from 1696 to 1914 based on historical documents

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Journal of Geographical Sciences 2020年第8期30卷 1307-1324页

作者： ZHAO Zhilong FANG Xiuqi YE Yu ZHANG Chengpeng ZHANG Diyang Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China

To evaluate the climatic and ecological impacts of anthropogenic activities in global change research,it is essential to reconstruct historical land use and land cover change on regional and global *** this study,we reconstructed cropland areas for 54 provinces within the European part of Tsarist Russia(ETR)over the periods of 1696–1914 using historical data,including cropland area,population,grain consumption,and grain yield per unit *** main results are as follows.(1)Total cropland areas and fractional cropland areas of ETR for 8 time sections during 1696–1914 were reconstructed,the former increased from 31.98×104 km2 to 147.40×104 km2,and the latter increased from 7.89%to 29.20%.The per capita cropland area decreased from 0.0246 km2 to 0.0113 km2 during 1696–1914.(2)Cropland expanded from the central and southwestern ETR to the black soil region,surrounding area of the Volga River,Ukraine region,the new Russia region,the vicinity of Ural,and north Caucasus region.(3)The expansion of territory,increase and migration of population,policies related to agricultural development and foreign trade,and the impacts of climate change were the reasons for the changes in cropland within ETR from 1696 to 1914.(4)In 1914,the cropland area and fractional cropland area of each province varied from 0.16×104 km2 and 0.76%to 5.65×104 km2 and 76.68%,respectively.(5)The comparisons show that the cropland areas of ETR in this study for 1696–1914 are higher than those in the HYDE 3.2 *** main reason for this finding might be the underestimation of per capita cropland areas in the HYDE 3.2 dataset,which values remained at approximately 0.01 km2 from 1700 to 1920.

关键词： land use/cover change cropland area provincial-level reconstruction past 300 years Eastern Europe

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