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Sources of uncertainty in exploring rangeland phenology： A case study in an alpine meadow on the central Tibetan Plateau

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Journal of Mountain Science 2017年第9期14卷 1827-1838页

作者： ZHAO Guang-shuai SHI Pei-li Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Science Beijing 100049 China China National Forestry Economics and Development Research Center Beijing 100714 China

Global climate change has been found to substantially influence the phenology of rangeland,especially on the Tibetan Plateau. However, there is considerable controversy about the trends and causes of rangeland phenology owing to different phenological exploration methods and lack of ground validation. Little is known about the uncertainty in the exploration accuracy of vegetation ***, in this study, we selected a typical alpine rangeland near Damxung national meteorological station as a case study on central Tibetan Plateau, and identified several important sources influencing phenology to better understand their effects on phenological exploration. We found man-made land use was not easily distinguished from natural rangelands, and therefore this may confound phenological response to climate change in the rangeland. Change trends of phenology explored by four methods were similar, but ratio threshold method(RTM) was more suitable for exploring vegetation phenology in terms of the beginning of growing season(BGS) and end of growing season(EGS). However, some adjustments are needed when RTM is used in extreme drought years. MODIS NDVI/EVI dataset was most suitable for exploring vegetation phenology of BGS and EGS. The discrimination capacities of vegetation phenology declined with decreasing resolution of remote sensing images from MODIS to GIMMS AVHRR datasets. Additionally, distinct trends of phenological change rates were indicated in different terrain conditions, with advance of growing season in high altitudes but delay of season in lower altitudes. Therefore, it was necessary to eliminate interference of complex terrain and man-made land use to ensure the representativeness of natural vegetation. Moreover, selecting the appropriate method to explore rangelands and fully considering the impact of topography are important to accurately analyze the effects of climate change on vegetation phenology.

关键词： Climate change Data quality NDVI Phenological exploration Northern Tibetan Plateau

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Critical role of multidimensional biodiversity in contributing to ecosystem sustainability under global change

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Geography and Sustainability 2023年第3期4卷 232-243页

作者： Ruiyang Zhang Dashuan Tian Jinsong Wang Shuli Niu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Department of Environment and Resources University of Chinese Academy of SciencesBeijing 100049China

The 21st century has seen an acceleration of global change,including climate change,elevated carbon dioxide,nitrogen deposition,and land-use intensification,which poses a significant threat to ecosystem ***-ertheless,studies on the relationship between biodiversity and ecosystem functioning(BEF)have consistently demonstrated that biodiversity enhances ecosystem functioning and its stability,even in variable environmental *** findings potentially indicate the critical role of biodiversity in promoting sustainable provi-sioning of ecosystem functioning under global *** paper provides a comprehensive review of current BEF research and the response of BEF to multiple global change *** demonstrate that(1)assessing the effects of biodiversity on ecosystem functioning requires consideration of multiple dimensions of diversity,such as diversity across multiple trophic levels(plants,animals,and microbes),multiple facets(taxonomy,functional traits,and phylogeny),and multiple spatial scales(local,regional,and landscape scales).(2)The interaction of multiple global change factors may lead to a greater reduction in biodiversity and ecosystem functioning than a single global change factor.(3)Multidimensional biodiversity regulates the response of ecosystem functioning to global change factors,indicating that high levels of multidimensional biodiversity can mitigate the negative impacts of global change on ecosystem ***,we emphasize that recognizing the importance of multidimensional biodiversity is critical for sustaining ecosystem ***,prioritizing conserva-tion efforts to maintain and enhance all dimensions of biodiversity is essential to address the challenges of future global change.

关键词： Biodiversity ecosystem functioning Global change ecosystem sustainability

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Effects of conservation measures on crop diversity and their implications for climate-resilient livelihoods: the case of Rupa Lake Watershed in Nepal

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Journal of Mountain Science 2022年第4期19卷 945-957页

作者： BAI Yun-li FU Chao THAPA Balaram RANA Ram Bahadur ZHANG Lin-xiu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China United Nations Environment Programme-International Ecosystem Management Partnership(UNEP-IEMP) Beijing 100101China Local Initiatives for Biodiversity Research and Development(LI-BIRD)PO Box 324Pokhara 33700Nepal

Agrobiodiversity conservation is vital for achieving sustainability, but empirical studies on the effects of different practices or measures on crop diversity are rare. This study aims to estimate the effects of raising conservation awareness(RCA),building diversity blocks(BDB), and their combination on crop diversity among 240 randomly selected households surrounding the Rupa Lake Watershed in Nepal. Based on descriptive analysis and multiple regression models, the results indicate that the two single measures had no significant effect on the numbers of crop species and varieties grown by households in 2018. However, the combination of RCA and BDB had a significantly positive effect on the number of crop varieties, especially for grain and vegetable crops. Considering that these crops are essential in the daily lives of local people, the results indicate that a strategy that combines both awareness raising and on-farm conservation measures can generate higher crop diversity and better serve the climate-resilient livelihoods of people in mountainous areas.

关键词： Agrobiodiversity Conservation measures Crop species and varieties Rupa Lake

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What is the mass of loess in the Loess Plateau of China?

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Science Bulletin 2019年第8期64卷 534-539页

作者： Yuanjun Zhu Xiaoxu Jia Jiangbo Qiao Ming'an Shao State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F University Institute of Soil and Water Conservation Chinese Academy of Sciences & Ministry of Water Resources College of Resources and Environment University of Chinese Academy of Sciences Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

The Loess Plateau of China(LP) has the largest and thickest loess deposits in the world. Quantifying the amount of loess in the LP is crucial for investigating the accumulation and erosion of loess, and determining the regional soil and water resource capacity. We used loess thickness data, a pedotransfer function for bulk density(BD), and the clay content data observed in 242 sites across the LP to derive the BD of loess and then estimate the loess mass and its distribution across the LP. The results indicated that the average BD of loess between the surface and bedrock is 1.58 g cm^(-3), varying from 1.18 to 1.87 g cm^(-3).The total loess mass is approximately 5.45 ? 10^(13) t, and the average loess mass over an area of 1 m^2 is 169 t, ranging from 1.36 to 585 t. The greatest mass of loess is in the south-central of the LP while the lowest mass of loess is in the northwest and river valley areas. Our estimate of loess mass provides key data for calculating water, carbon, and nutrient storages in the LP, which improves our understanding of soil-water processes and ecohydrological systems in this landscape.

关键词： The Loess Plateau Loess mass Pedotransfer function Soil erosion Bulk density

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Potential contributors to the quality of degraded soils in a hilly red soil region of southern China

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Pedosphere 2025年

作者： Yuna LI Meng XU Shulan CHENG Huajun FANG Yifan GUO Yi ZHOU Fangying SHI Hui WANG Long CHEN Yancheng Teachers University Yancheng 224002 (China) College of Resources and Environment University of Chinese Academy of Sciences Beijing 100049 (China) Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 (China) The Zhongke-Ji'an Institute for Eco-Environmental Sciences Ji'an 343000 (China)

Soil microorganisms are gaining recognition as useful indicators of soil quality. While microbial communities are highly susceptible to soil degradation, whether changes in microbial community attributes can be used as indicators of the quality of degraded soils is poorly understood. In this study, paddy soil samples were collected from sites with various soil degradation statuses in the hilly red soil region of southern China to investigate the responses of microbial communities to soil degradation and to explore their linkages with soil quality index (SQI, a composite index based on soil physical, chemical, and biological properties). We found that SQI values were significantly decreased by 21.2%–28.8% in degraded soils compared to the undegraded reference. Degraded and undegraded soils exhibited markedly different microbial community composition. This difference was driven by changes in edaphic factors, such as pH and nutrient availability, due to degradation. network analysis indicated a reduced network complexity by soil degradation for both bacterial and fungal communities. In addition, potential functions associated with carbon metabolism were enhanced while functions related to nitrogen oxidation were suppressed by soil degradation. Microbial attributes, including specific taxa, community structure, and potential functions, were identified using the random forest model as important predictors of soil quality, explaining 76% of the variation in the SQI values. Among the identified predictors, we found that SQI was positively related to the relative abundances of Sva0485 and Nitrospirae but negatively related to those of Acidothermaceae (Actinobacteria) and WPS-2. We also observed negative associations between SQI and the abundance of cellulolysis and aerobic chemoheterotrophy. Collectively, our results highlight the potential of incorporating DNA-based microbial metrics into routine soil monitoring to improve the assessment and prediction of soil degradation.

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Carbon transportation,transformation,and sedimentation processes at the land-river-estuary continuum

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Fundamental Research 2024年第6期4卷 1594-1602页

作者： Yang Gao Junjie Jia Yao Lu Kun Sun Jing Wang Shuoyue Wang Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

In terrestrial ecosystems,carbon(C)transportation and C pool transformation processes both occur at the landriver-estuary ***,C budget and C balance processes are generally critical in achieving the C neutrality of terrestrial *** study analyzes key C transportation processes at multiple interfaces that collectively constitute the land-river-estuary continuum,discusses C transportation and sedimentation processes at the land-river interface,and reveals aquatic plant C sequestration coupling processes and associated *** mechanisms of inorganic-organic C pools are also investigated here as well as a systematic evaluation of C transport flux within the different interfaces that constitute the land-river-estuary *** show that the net C sink of terrestrial ecosystems was 1.70 Pg C yr^(−1),wherein the gross primary productivity(GPP)of global terrestrial vegetation reached 123 Pg C yr^(−1),while rock weathering also consumed 0.30 Pg C yr^(−1)of atmospheric carbon dioxide(CO_(2)).Subsequently,the C transported by the land-river-estuary continuum reached 1.70 Pg C yr^(−1).During this process,0.20 Pg C is deposited and buried in inland water and 1.00 Pg C escapes from inland water systems each ***,only 0.85 Pg C is transported to the ***,this study clarifies control mechanisms of C transportation and transformation processes at the land-river-estuary *** aim of this study is to provide an important scientific basis for the quantitative analysis of C sources and sinks at the land-river-estuary continuum and C neutrality of the biosphere.

关键词： Land-river-estuary continuum Carbon neutrality Carbon source and sink Carbon transportation Carbon sedimentation Carbon cycle

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Vertical distribution and storage of soil organic and inorganic carbon in a typical inland river basin,Northwest China

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Journal of Arid Land 2018年第2期10卷 183-201页

作者： YANG Fan HUANG Laiming YANG Renmin YANG Fei LI Decheng ZHAO Yuguo YANG Jinling LIU Feng ZHANG Ganlin State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Knowledge of soil carbon（C） distribution and its relationship with the environment can improve our understanding of its biogeochemical cycling and help to establish sound regional models of C cycling. However, such knowledge is limited in environments with complex landscape configurations. In this study, we investigated the vertical distribution and storage of soil organic carbon（SOC） and soil inorganic carbon（SIC） in the 10 representative landscapes（alpine meadow, subalpine shrub and meadow, mountain grassland, mountain forest, typical steppe, desert steppe, Hexi Corridor oases cropland, Ruoshui River delta desert, Alxa Gobi desert, and sandy desert） with contrasting bioclimatic regimes in the Heihe River Basin, Northwest China. We also measured the 87 Sr/86 Sr ratio in soil carbonate to understand the sources of SIC because the ratio can be used as a proxy in calculating the contribution of pedogenic inorganic carbon（PIC） to total SIC. Our results showed that SOC contents generally decreased with increasing soil depth in all landscapes, while SIC contents exhibited more complicated variations along soil profiles in relation to pedogenic processes and parent materials at the various landscapes. There were significant differences of C stocks in the top meter among different landscapes, with SOC storage ranging from 0.82 kg C/m^2 in sandy desert to 50.48 kg C/m^2 in mountain forest and SIC storage ranging from 0.19 kg C/m^2 in alpine meadow to 21.91 kg C/m^2 in desert steppe. SIC contributed more than 75% of total C pool when SOC storage was lower than 10 kg C/m^2, and the proportion of PIC to SIC was greater than 70% as calculated from Sr isotopic ratio, suggesting the critical role of PIC in the C budget of this region. The considerable variations of SOC and SIC in different landscapes were attributed to different pedogenic environments resulted from contrasting climatic regimes, parent materials and vegetation types. This study provides an evidence for a general t

关键词： Heihe River Basin arid ecosystem soil landscape pedogenesis pedogenic carbonate SOC CaCO3

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Spatio-temporal patterns of temperature extremes and their response to atmospheric circulation factors in China from 1961 to 2020

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Journal of Geographical Sciences 2024年第10期34卷 1883-1903页

作者： LUO Yuanbo ZHOU Yuke ZHOU Chenghu State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCAsBeijing 100101China

Changes in surface temperature extremes have become a global *** on the daily lowest temperature(TN)and daily highest temperature(TX)data from 2138weather stations in China from 1961 to 2020,we calculated 14 extreme temperature indices to analyze the characteristics of extreme temperature *** widespread changes observed in all extreme temperature indices suggest that China experienced significant warming during this ***,the cold extreme indices,such as cold nights,cold days,frost days,icing days,and the cold spell duration index,decreased significantly by-6.64,-2.67,-2.96,-0.97,and-1.01 days/decade,*** contrast,we observed significant increases in warm extreme *** number of warm nights,warm days,summer days,tropical nights,and warm spell duration index increased by 8.44,5.18,2.81,2.50,and 1.66d/decade,*** addition,the lowest TN,highest TN,lowest TX,and highest TX over the entire period rose by 0.47,0.22,0.26,and 0.16℃/decade,***,using Pearson's correlation and wavelet coherence analyses,this study identified a strong association between extreme temperature indices and atmospheric circulation factors,with varying correlation strengths and resonance periods across different time-frequency domains.

关键词： temperature changes global warming atmospheric circulation wavelet coherence analysis China

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Corrigendum to “Economic impact of more stringent environmental standard in China: Evidence from a regional policy experimentation in pulp and paper industry” Resources, Conservation and Recycling 158 (2020), 104831

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Resources, Conservation and Recycling 2025年 212卷

作者： Meijie Yang Lan Yang Mingxing Sun Yutao Wang Fudan Tyndall Center Department of Environmental Science & Engineering Fudan University Shanghai 200438 China Key laboratory of ecosystem network observation and modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China International Ecosystem Management Partnership United Nations Environment Programme Beijing 100101 China Institute of Eco-Chongming (IEC) No.3663 Northern Zhongshan Road Shanghai 200062 China

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Spatial sampling inconsistency leads to differences in phenological sensitivity to warming between natural and experiment sites

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Science Bulletin 2019年第14期64卷 961-963页

作者： Nan Cong Miaogen Shen Jiaxing Zu Yangjian Zhang Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Key Laboratory of Alpine Ecology and Biodiversity Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100190 China

Plant spring phenology is receiving increasing attention owing to the recognition of its high sensitivity to ongoing climatic warming [1]. Changes in plant spring phenology can substantially influence a wide range of ecosystem structure and functions, which can not only affect human-beings but also in turn affect climate [2]. Warming experiments have been widely conducted to help understand, and thus predict plant phenological response to climate. Most of these experiment-based studies have focused on reporting the signs and magn让udes of phenological responses, and a few have included temperature sensitivity (phenological shifts per unit temperature change). However, applying the outputs of these experiments to predict future phenological response to climate change remains challenging.

关键词： differences phenological sensitivity experiment sites

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