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Biogeographical patterns of arbuscular mycorrhizal fungi diversity in China’s grasslands

Journal of Geographical Sciences 2021年第7期31卷 965-976页

作者： TENG Jialing TIAN Jing YU Guirui Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China College of Resources and Environmental Sciences Key Laboratory of Plant-Soil InteractionsMinistry of EducationChina Agricultural UniversityBeijing 100193China

Arbuscular mycorrhizal fungi(AMF)are universally mutualistic symbionts that colonize the fine roots of most vascular ***,the biogeographical patterns and driving factors of AMF diversity of plant roots in grasslands are not well *** this study,we used high-throughput sequencing techniques and bioinformatics to evaluate the AMF richness of 333 individual plant roots in 21 natural grassland ecosystems in northern China,including the Loess Plateau(LP),the Mongolian Plateau(MP),and the Tibetan Plateau(TP).The AMF richness showed a significant parabolic trend with increasing *** regional situations,the AMF richness in the grasslands of the MP(60.4±1.47)was significantly higher than those of the LP(46.4±1.43)and TP(44.3±1.64).Plant traits(including plant families,genera,and functional groups)explained the most variation in the AMF richness across China's grasslands,followed by energy and water;soil properties had the least *** results showed the biogeographical patterns of the AMF richness and the underlying dominant factors,providing synthetic data compilation and analyses in the AMF diversity in China's grasslands.

关键词： arbuscular mycorrhizal fungi biogeography grassland ecosystems northern China

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Responses of gross primary productivity to different sizes of precipitation events in a temperate grassland ecosystem in Inner Mongolia, China

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Journal of Arid Land 2016年第1期8卷 36-46页

作者： GUO Qun LI Shenggong HU Zhongmin ZHAO Wei YU Guirui SUN Xiaomin LI Linghao LIANG Naishen BAI Wenming Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Global Carbon Cycle Research Section Center for Global Environmental Research National Institute for Environmental Studies

Changes in the sizes of precipitation events in the context of global climate change may have profound impacts on ecosystem productivity in arid and semiarid grasslands. However, we still have little knowledge about to what extent grassland productivity will respond to an individual precipitation event. In this study, we quantified the duration, the maximum, and the time-integrated amount of the response of daily gross primary productivity (GPP) to an individual precipitation event and their variations with different sizes of precipitation events in a typical temperate steppe in Inner Mongolia, China. Results showed that the duration of GPP-response (τ_R) and the maximum absolute GPP-response (GPP_max) increased linearly with the sizes of precipitation events (P_es), driving a corresponding increase in time-integrated amount of the GPP-response (GPP_total) because variations of GPPtotal were largely explained by τ_R and GPP_max. The relative contributions of these two parameters to GPP_total were strongly P_es-dependent. The GPP_max contributed more to the variations of GPP_total when P_es was relatively small (<20 mm), whereas τ_R was the main driver to the variations of GPP_total when P_es was relatively large. In addition, a threshold size of at least 5 mm of precipitation was required to induce a GPP-response for the temperate steppe in this study. Our work has important implications for the modeling community to obtain an advanced understanding of productivity-response of grassland ecosystems to altered precipitation regimes.

关键词： precipitation event grassland gross primary productivity global climate change precipitation regime

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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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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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Spatial distribution of water-active soil layer along the south-north transect in the Loess Plateau of China

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Journal of Arid Land 2019年第2期11卷 228-240页

作者： ZHAO Chunlei SHAO Ming'an JIA Xiaoxu HUANG Laiming ZHU Yuanjun Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences College of Resources and Environment University of Chinese Academy of Sciences State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F University College of Natural Resources and Environment Northwest A&F University

Soil water is an important composition of water recycle in the soil-plant-atmosphere ***, intense water exchange between soil-plant and soil-atmosphere interfaces only occurs in a certain layer of the soil profile. For deep insight into water active layer(WAL, defined as the soil layer with a coefficient of variation in soil water content >10% in a given time domain) in the Loess Plateau of China,we measured soil water content(SWC) in the 0.0–5.0 m soil profile from 86 sampling sites along an approximately 860-km long south-north transect during the period 2013–2016. Moreover, a dataset contained four climatic factors(mean annual precipitation, mean annual evaporation, annual mean temperature and mean annual dryness index) and five local factors(altitude, slope gradient, land use, clay content and soil organic carbon) of each sampling site was obtained. In this study, three WAL indices(WALT(the thickness of WAL), WAL-CV(the mean coefficient of variation in SWC within WAL) and WALSWC(the mean SWC within WAL)) were used to evaluate the characteristics of WAL. The results showed that with increasing latitude, WAL-T and WAL-CV increased firstly and then decreased. WAL-SWC showed an opposite distribution pattern along the south-north transect compared with WAL-T and *** WAL-T of the transect was 2.0 m, suggesting intense soil water exchange in the 0.0–2.0 m soil layer in the study area. Soil water exchange was deeper and more intense in the middle region than in the southern and northern regions, with the values of WAL-CV and WAL-T being 27.3% and 4.3 m in the middle region,respectively. Both climatic(10.1%) and local(4.9%) factors influenced the indices of WAL, with climatic factors having a more dominant effect. Compared with multiple linear regressions, pedotransfer functions(PTFs) from arti?cial neural network can better estimate the WAL indices. PTFs developed by artificial neural network respectively explained 86%, 81% and 64% of the total

关键词： water active layer soil water content redundancy analysis pedotransfer function artificial neural network Loess Plateau

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Spatial pattern of plant species diversity and the influencing factors in a Gobi Desert within the Heihe River Basin, Northwest China

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Journal of Arid Land 2017年第3期9卷 379-393页

作者： ZHANG Pingping SHAO Ming'an ZHANG Xingchang Institute of Soil and Water Conservation Northwest A&F University State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water Resources Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Understanding the spatial pattern of plant species diversity and the influencing factors has important implications for the conservation and management of ecosystem biodiversity. The transitional zone between biomes in desert ecosystems, however, has received little attention in that regard. In this study, we conducted a quantitative field survey （including 187 sampling plots） in a 40-km2 study area to determine the spatial pattern of plant species diversity and analyze the influencing factors in a Gobi Desert within the Heihe River Basin, Northwest China. A total of 42 plant species belonging to 16 families and 39 genera were recorded. Shrub and semi-shrub species generally represented the major part of the plant communities （covering 90% of the land surface）, while annual and perennial herbaceous species occupied a large proportion of the total recorded species （71%）. Patrick richness index （R）, Shannon-Wiener diversity index （H）, Simpson＇s dominance index （D）, and Pielou＇s evenness index （I） were all moderately spadaUy variable, and the variability increased with increasing sampling area. The semivariograms for R and H＇ were best fitted with Gaussian models while the semivariograms for D andJ were best fitted with exponential models. Nugget-to-still ratios indicated a moderate spatial autocorrelation for R, H＇, and D while a strong spatial autocorrelation was observed for J. The spatial patterns of R and H＇ were closely related to the geographic location within the study area, with lower values near the oasis and higher values near the mountains. However, there was an opposite trend for D. R, H＇, and D were significantly correlated with elevation, soil texture, bulk density, saturated hydraulic conductivity, and total porosity （P〈0.05）. Generally speaking, locations at higher elevations tended to have higher species richness and diversity and the higher elevations were characterized by higher values in sand and gravel contents, bulk density, and saturated hydraul

关键词： species diversity spatial heterogeneity environmental factors Gobi Desert transitional zone

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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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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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Water consumption in summer maize and winter wheat cropping system based on SEBAL model in Huang-Huai-Hai Plain, China

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Journal of Integrative Agriculture 2015年第10期14卷 2065-2076页

作者： YANG Jian-ying MEI Xu-rong HUO Zhi-guo YAN Chang-rong JU Hui ZHAO Feng-hua LIU Qin Chinese Academy of Meteorological Sciences Key Laboratory of Dryland Agriculture Ministry of Agriculture/Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural Sciences Key Laboratory of Agricultural Environment Ministry of Agriculture/Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural Sciences Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Crop consumptive water use is recognized as a key element to understand regional water management performance. This study documents an attempt to apply a regional evapotranspiration model（SEBAL） and crop information for assessment of regional crop（summer maize and winter wheat） actual evapotranspiration（ET a） in Huang-Huai-Hai（3H） Plain, China. The average seasonal ET a of summer maize and winter wheat were 354.8 and 521.5 mm respectively in 3H Plain. A high-ET a belt of summer maize occurs in piedmont plain, while a low ET a area was found in the hill-irrigable land and dry land area. For winter wheat, a high-ET a area was located in the middle part of 3H Plain, including low plain-hydropenia irrigable land and dry land, hill-irrigable land and dry land, and basin-irrigable land and dry land. Spatial analysis demonstrated a linear relationship between crop ET a, normalized difference vegetation index（NDVI）, and the land surface temperature（LST）. A stronger relationship between ET a and NDVI was found in the metaphase and last phase than other crop growing phase, as indicated by higher correlation coefficient values. Additionally, higher correlation coefficients were detected between ET a and LST than that between ET a and NDVI, and this significant relationship ran through the entire crop growing season. ET a in the summer maize growing season showed a significant relationship with longitude, while ET a in the winter wheat growing season showed a significant relationship with latitude. The results of this study will serve as baseline information for water resources management of 3H Plain.

关键词： ETa winter wheat summer maize SEBAL crop information Huang-Huai-Hai Plain

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