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SSRN 2022年

作者： Hou, Guanqun Hou, Ruixing Wang, Yuanbo Ouyang, Zhu Key Laboratory 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 Beijing100049 China Observation and Research Station of Land Use Security in the Yellow River Delta Shandong Provincial Territorial Spatial Ecological Restoration Center Ministry of Natural Resources of the People’s Republic of China Shandong Jinan250014 China

Quantitative vegetation and microbial succession research is essential for understanding ecological processes. However, continuous observations over decadal time scales is currently lacking. The Yellow River delta (YRD) provides a unique, parallel pattern of primary succession among sub-deltas with different succession ages since 1855. Aimed for a quantitative description of the primary succession trajectories in the YRD, sampling points were selected from coastal to inland areas among four alluvial sectors formed during 1904–1929, 1929–1938, 1953–1976, and 1976–2020, using vegetation survey and amplicon sequencing of the genes encoding 16S rRNA. The results revealed that along with the succession stages, soil nutrition level exhibited an upward trend with decreasing salinity in the inland areas while natural vegetation communities were growing from saline meadow with simple community structure to brush grassland with Imperata cylindrica (L.) Beauv. as the constructive species. In the coastal areas, the Yellow River brought the new alluvial sector fresh water and fertile sediment but soil salt stress would increase after the diversion of river tail, leading to vegetation deterioration. From coastal to inland, soil properties and vegetation were generally improving, where the dominant phylum changed from Proteobacteria to Actinobacteriota, dominating the increasing ratio of gram-positive to gram-negative. Bacterial community similarity was nearly linearly negatively correlated with the succession time intervals (r 2 = 0.605), reflecting the orderly shifts in bacterial structure. The levels of nitrogen utilization, alkyl carbon utilization, and customer niches increased with soil aging, while dissimilative metabolism phenotype decreased (p © 2022, The Authors. All rights reserved.

关键词： Vegetation

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Succession of Vegetation and Bacterial Communities Along a Century-Long Chronosequence in the Yellow River Delta

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SSRN 2022年

关键词： Vegetation

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Contribution of irrigation to the production of maize, wheat, and rice in the major global producing countries

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National Science Review 2024年第11期11卷 44-46页

作者： Zhipin Ai Julien Boulange Xin Zhao Fadong Li Rashid Mahmood Kiril Manevski Yonghui Yang Guirui Yu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences College of Resources and Environment University of Chinese Academy of Sciences United Graduate School of Agricultural Science Tokyo University of Agriculture and Technology Earth System Division National Institute for Environmental Studies Water Engineering and Management Asian Institute of Technology Sino-Danish College University of the Chinese Academy of Sciences Department of Agroecology Aarhus University Center for Agricultural Resources Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences

Global megatrends in population growth and climate change, together with regional conflicts, are driving an increasing and unequal demand for food and consequently pose a serious threat to food security worldwide. Studies have shown that increasing cropland productivity, rather than expanding cropland area, may be a more viable strategy to promote food security [1]. From an agronomic perspective, irrigation can greatly enhance crop yield and productivity,

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Nutrient Addition Alters Drought Resistance and Resilience Via Forb Abundance in a Temperate Grassland

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SSRN 2024年

作者： Luo, Dengnan Yang, Guojiao Zhang, Guangru Liu, Qianguang Guo, Qun Li, Shenggong Xie, Yun Hu, Zhongmin Facility of Geographical Science Beijing Normal University Beijing100875 China College of Arts and Sciences Beijing Normal University at Zhuhai Zhuhai519087 China Hainan Baoting Tropical Rainforest Ecosystem Observation and Research Station School of Ecology Hainan University Haikou570228 China School of Geography South China Normal University Guangzhou510631 China Key Laboratory 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 the Chinese Academy of Sciences Beijing101408 China National Ecosystem Science Data Center Beijing100101 China

Nutrient addition has resulted in profound effects on grassland ecosystems. Yet, the response and ecological mechanisms of grassland ecosystem resistance and resilience in relation to nutrient inputs are not fully understood. We investigated the effects of nutrient addition on resistance and resilience of a temperate grassland during a severe drought event. Our findings demonstrated that nutrient addition significantly alters ecosystem resistance and resilience. The resistance of both the community and forb was decreased by nitrogen (N) addition, while only forb resistance was significantly decreased under phosphorus (P) addition. Interestingly, N addition also hindered the community and forb resilience, whereas community resilience significantly enhanced under P addition. Unexpectedly, even although nutrient addition significantly affected grass biomass, grass resistance and resilience were not significantly altered by nutrient addition. Conversely, forb biomass was not significantly influenced by nutrient addition, but there was a noticeable decrease in forb abundance. Furthermore, structural equation models revealed that nutrient addition affect community drought resistance and resilience by altering the stability dimension of functional groups via forb abundance. Our outcomes highlight the crucial function of forbs in sustaining grassland ecosystem stability in the face of global change. Moreover, it provides crucial scientific evidence for the scientific management and sustainable preservation of ecosystem services in grassland ecosystems under global change. © 2024, The Authors. All rights reserved.

关键词： Drought

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Correction to: Contrasting rhizosphere soil nutrient economy of plants associated with arbuscular mycorrhizal and ectomycorrhizal fungi in karst forests

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Plant and Soil 2021年第1期470卷 95-96页

作者： Yang, Yang Zhang, Xinyu Hartley, Iain P. Dungait, Jennifer A. J. Wen, Xuefa Li, Dandan Guo, Zhiming Quine, Timothy A. Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China College of Resources and Environment University of Chinese Academy of Sciences Beijing China Geography College of Life and Environmental Sciences University of Exeter Exeter UK College of Land and Environment Shenyang Agricultural University Shenyang China Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical Garden Chinese Academy of Sciences Guangzhou China

A Correction to this paper has been published: https://***/10.1007/s11104-021-05032-6

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Soil Organic Matter Quality, Rather than Quantity, Drives Spatial Variation of Soil Microbial Basal Respiration in Boreal Forests

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SSRN 2022年

作者： Yang, Yan Cheng, Shulan Fang, Huajun Guo, Yifan Li, Yuna Zhou, Yi Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China University of Chinese Academy of Sciences Beijing100049 China Northwest Plateau Institute of Biology Chinese Academy of Sciences Qinghai Xining810001 China The Zhongke-Ji’an Institute for Eco-Environmental Sciences Ji'An343000 China

Soil microbial basal respiration (BR), a key process for quantifying the soil-atmospheric CO 2 fluxes, has been extensively studied at individual sites. However, the controlling factors of the spatial variation in BR at larger spatial scales characterized by the same vegetation types are still poorly identified. Here, we examined the influence of soil organic matter (SOM) quantity, quality, soil physical, and microbial properties on BR along a 650 km north-south boreal forest transect in eastern China. The chemical structures of soil organic carbon (SOC) were characterized by 13 C-nuclear magnetic resonance spectroscopy, and soil microbial compositions were determined by high-throughput sequencing. Results showed that the variation of BR was independent of latitude both in organic and mineral layers. The BR in the O layer was significantly ( P © 2022, The Authors. All rights reserved.

关键词： Nuclear magnetic resonance spectroscopy

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Succession of Vegetation and Bacterial Communities Along a Century-Long Chronosequence in the Yellow River Delta

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SSRN 2022年

关键词： Vegetation

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Assessing and Comparing Smallholders’Vulnerability to Climate Change among Countries in the Pan-Third Pole Region

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Journal of Resources and Ecology 2024年第4期15卷 1015-1026页

作者： XU Xiangbo XU Ce LI Chang FU Chao ZHOU Yunqiao Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China International Ecosystem Management Partnership United Nations Environment ProgrammeBeijing 100101China Land Consolidation and Rehabilitation Center Ministry of Natural ResourcesBeijing 100035China Technology Innovation Center for Land Engineering Ministry of Natural ResourcesBeijing 100035China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

A comprehensive assessment of climate change vulnerability is imperative for formulating effective adaptation strategies and advancing sustainable development *** one of the most climate-vulnerable regions globally,the Pan-Third Pole area lacks transnational vulnerability assessments,which poses a significant obstacle to efficient climate *** study conducted transnational comparisons based on primary micro-survey data collected uniformly across Nepal,Cambodia,Thailand,and Myanmar,which are all located in the Pan-Third Pole *** and comparing the vulnerabilities employed an extended framework of climate change *** findings reveal substantial variations in vulnerability among the countries,with Cambodia exhibiting the highest vulnerability,followed by Thailand,Myanmar,and Nepal in descending order,primarily due to differences in *** exposure to climate change also varied *** scores decreased in the order of Nepal>Cambodia>Thailand>Myanmar,with demographic factors,tap water accessibility,and land being the major contributors and sources of differentiation among the *** adaptability,Thailand demonstrated the highest adaptability,with human and financial capital as the key *** outcomes underscore the need for tailored policy measures addressing the diverse vulnerabilities,including enhancing household disaster prevention and capital ***,targeted international investments are crucial for improving adaptability among smallholders in this unique region.

关键词： climate change vulnerability smallholder sustainable development Pan-Third Pole region

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Contrasting nutrient-mediated responses between surface and deep fine root biomass to N addition in poplar plantations on the east coast of China

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FOREST ECOLOGY AND MANAGEMENT 2021年 490卷 119152-119152页

作者： Geng, Qinghong Ma, Xiaocui Liao, Jiahui Wu, Wei Niu, Shuli Luo, Yiqi Xu, Xia Nanjing Forestry Univ Coinnovat Ctr Sustainable Forestry Southern China Dept Ecol Nanjing 210037 Jiangsu Peoples R China Chinese Acad Sci Inst Geog Sci & Nat Resources Res Key Lab Ecosystem Network Observat & Modeling Beijing 100101 Peoples R China No Arizona Univ Ctr Ecosyst Sci & Soc Flagstaff AZ 86011 USA

Dynamics of fine root biomass (FRB) is fundamental to understanding carbon allocation and storage in forests. However, our understanding of FRB responses and its vertical distribution with respect to atmospheric nitrogen (N) deposition is limited. In this study, we applied five N addition rates (0, 5, 10, 15, and 30 g m? 2 yr? 1) to explore effects of N addition on FRB and its distribution patterns along soil profile (0?100 cm) in poplar plantations on the east coast of China. We found that N addition significantly decreased total FRB and altered its vertical distribution. Specifically, N addition decreased FRB in the surface (0?20 cm) and increased it in the deep (20?100 cm) soil layers. Structural equation models (SEM) showed that soil available nutrients dominantly regulated FRB and its vertical distribution in poplar plantations. Decreased FRB and increased root distribution to deep soil layers indicate that trees can not only regulate carbon allocation between above- and below- ground tissues, but also optimize nutrient uptake by redistributing their roots vertically under different nutrient environments.

关键词： Nitrogen addition Soil available nutrients Fine root biomass Surface and deep soil profile Vertical distribution Poplar plantations

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Spatio-temporal Characteristics of the Extreme Climate Events and Their Potential Effects on Crop Yield in Ethiopia

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Journal of Resources and Ecology 2018年第3期9卷 290-301页

作者： SONG Shuai LI Fadong LU Yonglong Kifayatullah Khan XUE Jianfang LENG Peifang State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China 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 Sciences Beijing 100049 China Department of Environmental and Conservation Sciences University of Swat Swat 19130 Pakistan

Extreme climate events exhibit an increasing spatio-temporal trend globally, and the increasing intensity and frequency may have severe impacts on the human society and natural ecosystems. This study analyzed the extreme temperature and precipitation variability from 1956 to 2016, and evaluated their potential effects on crop yield in Ethiopia. Relative extreme temperature indices exhibited a decreasing trend with low-temperature events, but a significantly upward trend with extreme high temperature events. The frequency of annual warm nights increased to a greater degree than that of cold days. The total annual wet-day precipitation decreased significantly at a rate of-46 mm/decade. Further, the succession of dry days gradually increased by 5.6 day/decade, while an opposite trend of wet days was found with a decline of 1.4 day/decade. The correlation between annual precipitation and crop production was 0.422, indicating that extreme precipitation indices may have higher explanatory power than extreme temperature indices in the crop yield variations. Moreover, the extreme climate changes have induced significant adverse impacts on crops yield particularly in Ethiopia where no proper adaptation measures have been implemented.

关键词： extreme climate crop yield trend analysis Ethiopia

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