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SSRN 2023年

作者： Liu, Yu Wang, Bo Sheng, Qinghong Li, Jun Zhao, Hong Wang, Shuwei Liu, Xiaoli He, Honglin College of Astronautics Nanjing University of Aeronautics and Astronautics Nanjing211106 China Changshu National Agro-Ecosystem Observation and Research Station Institute of Soil Science Chinese Academy of Sciences Nanjing210008 China Yingtan National Agro-Ecosystem Observation and Research Station Institute of Soil Science Chinese Academy of Sciences Nanjing210008 China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China

Rice plant height is a comprehensive reflection of rice itself, as well as soil, hydrology, meteorology, and other factors, and is an important indicator for monitoring rice growth. Synthetic Aperture Radar (SAR) has become one of the important means for monitoring rice growth due to its sensitivity to vegetation changes. This paper proposes a dynamic monitoring method for rice plant height based on crop growth law, effectively combining crop growth law with plant height models, developing a Dual Polarization SAR crop growth (DPSCG) model, and using unsupervised domain adaptive (DA) method to improve the generalization ability of growth monitoring. The experimental results show that the DPSCG model proposed in this study considers the correlation of crop growth changes in the time dimension and the difference in crop growth at different phenological stages and can be effectively applied to the entire growth period of rice. © 2023, The Authors. All rights reserved.

关键词： Synthetic aperture radar

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Regulation of tree water use by biophysical factors: Insights based on multi-layer hierarchical residual analysis

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Journal of Hydrology 2025年 660卷

作者： Du, Jiali Oren, Ram Hölttä, Teemu Feng, Shaoyuan Wang, Weishu Dai, Xiaoqin Huo, Zailin Key Laboratory of Tree Breeding and Cultivation National Forestry and Grassland Administration Research Institute of Forestry Chinese Academy of Forestry Beijing100091 China State Key Laboratory of Efficient Utilization of Agricultural Water Resources China Agricultural University Beijing100083 China Henan Xiaolangdi Forest Ecosystem Observation and Research Station Henan Jiyuan454650 China Nicholas School of the Environment & Pratt School of Engineering Duke University DurhamNC27708 United States Department of Forest Sciences Institute for Atmospheric and Earth System Research INAR/Forest Sciences University of Helsinki FI-00014 Finland College of Hydraulic Science and Engineering Yangzhou University Yangzhou225009 China Qianyanzhou Ecological Research Station Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China

The complex impact of biophysical factors on tree water use in changing environments has been an important topic in the ecohydrological studies. However, understanding how to model tree water use based on key biophysical factors requires an in-depth analysis. This study monitored the sap flow (Q) of Populus popularis in an arid area over four consecutive growing seasons from 2018 to 2021, and leaf area index (LAI), soil water content at 0–30 cm soil depth (SWC0–30 cm), groundwater level, and meteorological variables (photosynthetically active radiation (PAR), solar radiation, air temperature, relative humidity, wind speed at 2 m height, and rainfall). Based on a three-layer hierarchical residual analysis, three novel statistical models representing the total effects of biophysical factors (meteorological variables, water supply conditions, and circadian rhythms factors) on normalized daily sap flow (Q/LAI), normalized nocturnal sap flow (Qn/LAI), and the ratio of nocturnal sap flow to daily sap flow (Qn/Q) were constructed on a daily scale, respectively. These models could estimate Q/LAI, Qn/LAI, and Qn/Q over four years. The results further indicated that daily total PAR and mean SWC0–30 cm best explained the variation in Q/LAI, while nighttime length and mean SWC0–30 cm jointly influenced Qn/LAI. Interannually, the seasonal patterns of daily Q/LAI and Qn/LAI were correlated to the mean growing season SWC0–30 cm. The proposed models can quantify daily tree water use, nighttime water use, and its proportion in daily tree water use using biophysical factors, specifically daily total PAR, SWC0–30 cm, nighttime length, Q, and day of year. Our findings contribute to a deeper understanding of the drivers of daily and nighttime tree water use in arid regions. © 2025 Elsevier B.V.

关键词： Radiation damage

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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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Effects of climate and forest age on the ecosystem carbon exchange of afforestation

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Journal of Forestry Research 2020年第2期31卷 365-374页

作者： Zhi Chen Guirui Yu Qiufeng Wang Synthesis Research Center of Chinese Ecosystem Research Network and Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101People’s Republic of China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049People’s Republic of China

Afforestation is believed to be an effective practice to reduce global warming by sequestering large amounts of carbon in plant biomass and ***,the factors that determine the rate of carbon sequestration with afforestation are still poorly *** analyzed ecosystem carbon exchange after afforestation based on eddy covariance measurements with the aim to identify factors responsible for the rate of carbon exchange following *** results indicated that afforestation in the tropical/subtropical and temperate climate zones had greater capacities for carbon sequestration than those in boreal *** ecosystem production(NEP),gross primary production(GPP)and ecosystem respiration(RE)varied greatly with age groups over ***,NEP was initially less than zero in the\10 year group and then increased to its peak in the 10-20 year *** of varied previous land use types and planting of diverse tree species did not result in different carbon *** general linear model showed that climate zone and age of afforestation were the dominant factors influencing carbon *** factors jointly controlled 51%,61%and 63%of the variation in NEP,GPP and RE,*** to the strong regulation of climate on GPP and RE,NEP showed greater sensitivity to the age of *** results increase our understanding of the variation in ecosystem carbon exchange of afforestation and suggest that afforestation in subtropical and temperate areas after 20 years would yield greater carbon sink benefits than would afforestation of boreal regions.

关键词： Afforestation Carbon sequestration Eddy covariance Climate Age

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Soil moisture alters the responses of alpine ecosystem productivity to environmental factors, especially VPD, on the Qinghai-Tibetan Plateau

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Science of the Total Environment 2024年 947卷 174518页

作者： Zhang, Tao Shan, Baoxin Xu, Mingjie Zhao, Guang Zheng, Zhoutao Tang, Yuanyuan Chen, Ning Zhu, Juntao Cong, Nan Niu, Ben Zhang, Yangjian College of Agronomy Shenyang Agricultural University Shenyang110866 China School of Life Sciences Hebei University Baoding071002 China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China Key Laboratory of Forest Ecology and Management Institute of Applied Ecology Chinese Academy of Sciences Shenyang110016 China College of Resources and Environment University of Chinese Academy of Sciences Beijing100190 China Jilin Meteorological Observatory Changchun130062 China

Water availability, which can be represented by soil water content (SWC), plays a crucial role in plant growth and productivity across the cold and arid Qinghai-Tibetan Plateau. However, the indirect effects of SWC are less well understood, and a more comprehensive understanding of its regulating effects may enhance the recognition of its importance, as this factor is pivotal for accurately predicting the future response of alpine ecosystems to climate change. In this study, in situ eddy covariance observation data from typical alpine ecosystems and satellite data covering the Qinghai-Tibetan region were used to comprehensively reveal the effects of SWC on ecosystem productivity. The results indicated that SWC played an important role in regulating the responses of gross primary productivity (GPP) to other environmental factors over both time and space, especially in terms of the responses of GPP to vapor pressure deficit (VPD). The regulating effect can be summarized as follows: there was a specific SWC value (SWC = 0.24 m3 m−3 on the Qinghai-Tibetan Plateau) above which SWC was no longer the primary limiting factor. The responses of GPP to certain environmental factors shifted from negative to positive when the SWC increased above this value. The responses of GPP to VPD exhibited the highest sensitivity to the regulating effects of SWC, with a general response pattern found across different temporal and spatial scales. The findings revealed divergent responses of GPP to environmental factors under different SWC conditions and between arid and humid regions, emphasizing the importance of soil water conditions. These findings suggest that water conditions should be given primary consideration in global change studies. © 2024

关键词： Climate change

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Changes in Soil Nutrient Stoichiometric Ratios Reveal Increasing Phosphorus Limitation Along a Tropical Soil Chronosequence in Hainan Island, China

SSRN

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SSRN 2022年

作者： Zhao, Wen Huang, Lai-Ming 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

Understanding the variations and controls of stoichiometric ratios of soil nutrients during different stages of soil evolution can provide a basis for ecosystem nutrient management and regulation. In the present study, soil nutrient contents and basic soil physicochemical properties (soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), available nitrogen (AN), available phosphorus (AP), pH, cation exchange capacity (CEC), and clay content (Cy)) were measured in a tropical soil chronosequence (0.09, 0.146, 0.64, 1.12, 1.81, and 2.30 million years) developed on basalt in the northern Hainan Island. The environmental factor data (annual average temperature (MAT), annual average rainfall (MAP), average annual evaporation (Ea), normalized differential vegetation index (NDVI), altitude (ALT), longitude (LON), and latitude (LAT)) were simultaneously extracted to understand the changes in and factors associated with soil nutrient stoichiometric ratios during different stages of soil development. Results showed that AN content decreased continuously with increasing soil age. TN, TP, AP, and SOC contents increased initially during the early stage of soil development, reaching a peak value in the 0.146 million-year-old soil profile (with profile weighted mean values of 1.14, 1.31, 3.53, and 11.25 g kg -1 , respectively). Thereafter, TP and AP fluctuated with increasing soil age (ranging from 0.34 to 0.75 g kg -1 and 0.90 to 2.49 mg kg -1 , respectively), whereas SOC exhibited a decreasing trend with aging soil. C:N (9.82–12.75), C:P (0.86–1.98), and N:P (0.86–1.98) remained relatively stable across the soil chronosequence, with the coefficient of variation (CV) 0.64 million years) developed on basalt in order to alleviate the increasing P limitation during the late stage of soil evolution. © 2022, The Authors. All rights reserved.

关键词： Soils

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Achievements,challenges,and recommendations for waterbird conservation in China's coastal wetlands

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Avian Research 2023年第3期14卷 305-314页

作者： Zhijun Ma Chi-Yeung Choi Xiaojing Gan Jing Li Yang Liu David S.Melville Tong Mu Theunis Piersma Zhengwang Zhang Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering National Observation and Research Station for Wetland Ecosystems of the Yangtze EstuaryFudan UniversityShanghai200438China Division of Natural and Applied Sciences Environmental Research CentreDuke Kunshan UniversityKunshan215316JiangsuChina The Paulson Institute Beijing Representative Office Beijing100006China Spoon-Billed Sandpiper Shanghai Environmental Protection Technology Co.Ltd.Shanghai201100China State Key Laboratory of Biocontrol School of EcologySun Yat-Sen UniversityGuangzhou510275China Global Flyway Network Wakefield7096New Zealand Princeton School of Public and International Affairs Princeton UniversityPrincetonNJ08544USA NIOZ Royal Netherlands Institute for Sea Research Department of Coastal SystemsP.O.Box 591790AB Den BurgTexelthe Netherlands BirdEyes Centre for Global Ecological Changeand Conservation Ecology GroupGroningen Institute for Evolutionary Life Sciences(GELIFES)University of Groningen9700CC Groningenthe Netherlands CEAAF Center for East Asian-Australasian Flyway Studies Beijing Forestry UniversityQinghua East Road 35Haidian DistrictBeijing100083China Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering School of Life SciencesBeijing Normal UniversityBeijing100875China

China’s coastal wetlands provide breeding,migration stopover,and wintering habitats for about 230 waterbird species,which is more than a quarter of all waterbirds in the ***-scale and high intensity human activities have resulted in serious loss and degradation of coastal wetlands over the past half century,causing population declines in many *** a literature review and expert surveys,this article reviews conservation measures taken in recent decades to protect waterbirds in China’s coastal wetlands and provides recommendations for future conservation action from three aspects:policy and administration,habitat conservation and management,and multiparty *** the past decades,many conservation legislation,regulations and action plans at the national level and more site-specific measures and interventions have been implemented,with notable improvement in the effectiveness in policy making and multi-stakeholder ***,some threats to waterbirds have been mitigated and many key sites for waterbirds have been designated as strictly protected nature ***,some critical issues still remain,mostly related to habitat conservation and management,such as coastal wetland restoration,control of invasive Spartina alterniflora,control of environmental pollution,and improvement of artificial habitat *** highlight that protecting natural tidal wetlands and improving habitat quality are critical for the conservation of coastal waterbirds,especially those highly dependent on the intertidal *** has demonstrated strong commitment to ecological conservation and restoration for the future,in terms of both funding and policies for biodiversity and wetland *** is important that this commitment to conserve coastal waterbirds is supported continuously by science-and evidence-based decisions and actions.

关键词： Coastal zone East Asian-Australasian Flyway Habitat Intertidal flat Management Shorebird

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Simulating daily PM2.5 concentrations using wavelet analysis and artificial neural network with remote sensing and surface observation data

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Chemosphere 2023年第1期340卷

作者： Guo, Qingchun He, Zhenfang Wang, Zhaosheng School of Geography and Environment Liaocheng University Liaocheng252000 China Key Laboratory of Atmospheric Chemistry China Meteorological Administration Beijing100081 China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an710061 China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China National Ecosystem Science Data Center Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China

Accurate PM2.5 concentrations predicting is critical for public health and wellness as well as pollution control. However, traditional methods are difficult to accurately predict PM2.5. An adaptive model coupled with artificial neural network (ANN) and wavelet analysis (WANN) is utilized to predict daily PM2.5 concentrations with remote sensing and surface observation data. The four evaluation metrics, namely Pearson correlation coefficient (R), mean absolute percentage error (MAPE), root mean square error (RMSE), and mean absolute error (MAE), are utilized to evaluate the performances of the artificial neural network (ANN) and WANN methods. From the predicting results, The WANN model has a higher R (R = 0.9990) during the testing period compared with R (R = 0.6844) based on the ANN model. Similarly, the WANN model has a lower MAPE (3.6988%), RMSE (1.0145 μg/m3), MAE (1.3864 μg/m3), compared with MAPE (80.0086%), RMSE (16.5838 μg/m3), MAE (12.2420 μg/m3) of the ANN. In addition, comparing the outcomes of the proposed WANN method with the ANN method, it was observed that the error during the training and verification period has decreased significantly. Furthermore, the statistical methods are used to analyze WANN and ANN, showing that WANN has higher training accuracy and better stability. Therefore, it is feasible to establish WANN to predict PM2.5 concentrations (1 day in advance) by using remote sensing and surface observation data. © 2023

关键词： Neural networks

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How will climate change affect the sources of global irrigation water withdrawal?

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Science Bulletin 2024年第21期69卷 3361-3364页

作者： Zhipin Ai Xin Zhao Julien Boulange Fadong Li Rashid Mahmood Qiuying Zhang Yonghui Yang Jun Xia 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 101408China Earth System Division National Institute for Environmental StudiesTsukuba 305-8506Japan United Graduate School of Agricultural Science Tokyo University of Agriculture and TechnologyTokyo 183-8509Japan Water Engineering and Management Asian Institute of TechnologyPathumthani 12120Thailand Chinese Research Academy of Environmental Sciences Beijing 100012China Center for Agricultural Resources Research Institute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuang 050021China State Key Laboratory of Water Resources Engineering and Management Wuhan UniversityWuhan 430072China

Irrigation plays a vital role in global food production,contributing approximately 40%of the total production[1],although the contribution varies by crop type[2,3].However,irrigation water withdrawal constitutes 65%–70%of total global anthropogenic water withdrawal[4,5],making it the largest water-use sector *** irrigation water demand,sources,and availability,particularly in the context of climate change,is crucial for identifying potential threats to crop production and ensuring future global food *** studies have focused extensively on the impacts of climate change on irrigation water demand and withdrawal[6–9];however,it remains unclear how climate change will affect the sources of irrigation water withdrawal.

关键词： irrigation withdrawal sources

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Stability of Vegetation Net Primary Productivity and Climate Impacts in China in the Following Century

全球变化数据仓储（中英文）

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全球变化数据仓储（中英文） 2023年第6期 1-3页

作者： CHEN Xing WANG Junbang HE Qifan WANG Chunyu YE Hui National Ecosystem Science Data Center Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China College of Tourism and Geography Jiujiang UniversityJiujiang 332005JiangxiChina Qilu Normal University Jinan 205200China

In order to investigate NPP and its stability at long time scales of nearly 100 years under future climate scenarios,the authors developed the dataset of Stability of Vegetation Net Primary Productivity and Climate Impacts in China in the Following Century using HadGEM2-ES data scenarios based on the Regional Climate Model RegCM4.6 and *** dataset includes:(1)mean NPP values and their trends from 2006 to 2099 under RCP4.5 and RCP8.5 scenarios;(2)multi-year mean NPP stability values for the full(2006-2099),early(2006-2035),mid(2036-2065)and late(2066-2099)*** spatial resolution of the data is 0.1°.The dataset is archived in 17 data files with data size of 15.0 MB(Compressed into one file with 4.26 MB).One of the research results based on this dataset was published in Acta Geographica Sinica,Vol.78,No.3,2023.

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