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Global convergence in terrestrial gross primary production response to atmospheric vapor pressure deficit

Science China(Life Sciences) 2024年第9期67卷 2016-2025页

作者： Chao Huang Jingfeng Huang Jingfeng Xiao Xing Li Hong SHe Yu Liang Fusheng Chen hanqin tian Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed College of ForestryJiangxi Agricultural UniversityNanchang 330045China CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Institute of Applied Remote Sensing&Information Technology College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China Key Laboratory of Agricultural Remote Sensing and Information Systems Zhejiang ProvinceZhejiang UniversityHangzhou 310058China Earth Systems Research Center Institute for the Study of EarthOceansand SpaceUniversity of New HampshireDurham NH 03824USA Research Institute of Agriculture and Life Sciences Seoul National UniversitySeoul 08826South Korea School of Natural Resources University of Missouri203 ABNR BuildingColumbiaMO 65211USA Schiller Institute for Integrated Science and Society Department of Earth and Environmental SciencesBoston CollegeChestnut HillMA 02467USA

Atmospheric vapor pressure deficit(VPD)increases with climate warming and may limit plant ***,gross primary production(GPP)responses to VPD remain a mystery,offering a significant source of uncertainty in the estimation of global terrestrial ecosystems carbon *** this study,in-situ measurements,satellite-derived data,and Earth System Models(ESMs)simulations were analysed to show that the GPP of most ecosystems has a similar threshold in response to VPD:first increasing and then *** VPD exceeds these thresholds,atmospheric drought stress reduces soil moisture and stomatal conductance,thereby decreasing the productivity of terrestrial *** ESMs underscore CO_(2) fertilization effects but predict significant GPP decline in low-latitude ecosystems when VPD exceeds the *** results emphasize the impacts of climate warming on VPD and propose limitations to future ecosystems productivity caused by increased atmospheric water *** VPD,soil moisture,and canopy conductance interactions into ESMs enhances the prediction of terrestrial ecosystem responses to climate change.

关键词： atmospheric water demands soil moisture stomatal conductance photosynthesis climate warming

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Phosphorus limitation on CO_(2)fertilization effect in tropical forests informed by a coupled biogeochemical model

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Forest Ecosystems 2024年第4期11卷 502-515页

作者： Zhuonan Wang hanqin tian Shufen Pan Hao Shi Jia Yang Naishen Liang Latif Kalin Christopher Anderson Natural Resources Ecology Laboratory Colorado State UniversityFort CollinsCO80523USA Center for Earth System Science and Global Sustainability Schiller Institute for Integrated Science and SocietyBoston CollegeChestnut HillMAUSA Department of Earth and Environmental Sciences Boston CollegeChestnut HillMAUSA Department of Engineering Boston CollegeChestnut HillMAUSA Research Center for Eco-Environmental Sciences State Key Laboratory of Urban and Regional EcologyChinese Academy of SciencesBeijingChina Department of Natural Resource Ecology and Management Oklahoma State UniversityStillwaterOKUSA Center for Global Environmental Research(CGER) National Institute for Environmental Studies(NIES)TsukubaIbaraki305-8506Japan College of Forestry Wildlife and EnvironmentAuburn UniversityAuburnALUSA

Tropical forests store more than half of the world's terrestrial carbon(C)pool and account for one-third of global net primary productivity(NPP).Many terrestrial biosphere models(TBMs)estimate increased productivity in tropical forests throughout the 21st century due to CO_(2)***,phosphorus(P)liaitations on vegetation photosynthesis and productivity could significantly reduce the CO_(2)fertilization ***,we used a carbon-nitrogen-phosphorus coupled model(Dynamic Land Ecosystem Model;DLEM-CNP)with heterogeneous maximum carboxylation rates to examine how P limitation has affected C fluxes in tropical forests *** model results showed that the inclusion of the P processes enhanced model performance in simulating ecosystem *** further compared the simulations from DLEM-CNP,DLEM-CN,and DLEMC and the results showed that the inclusion of P processes reduced the CO_(2)fertilization effect on gross primary production(GPP)by 25%and 45%,and net ecosystem production(NEP)by 28%and 41%,respectively,relative to CN-only and C-on ly *** the 1860s to the 2010s,the DLEM-CNP estimated that in tropical forests GPP increased by 17%,plant respiration(Ra)increased by 18%,ecosystem respiration(Rh)increased by 13%,NEP increased by 121%per unit area,***,factorial experiments with DLEM-CNP showed that the enhanced NPP benefiting from the CO_(2) fertilization effect had been offset by 135%due to deforestation from the 1860s to the *** study highlights the importance of P limitation on the C cycle and the weakened CO_(2)fertilization effect resulting from P limitation in tropical forests.

关键词： Tropical forests Carbon-nitrogen-phosphorus model Phosphorus limitation CO_(2)fertilization effect Terrestfial ecosy stem model

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Four decades of full-scale nitrous oxide emission inventory in China

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National Science Review 2024年第03期11卷 137-149页

作者： Minqi Liang Zheyan Zhou Peiyang Ren Han Xiao Xu-Ri Zhongmin Hu Shilong Piao hanqin tian Qing Tong Feng Zhou Jing Wei Wenping Yuan School of Atmospheric Sciences Guangdong Province Data Center of Terrestrial and Marine Ecosystems Carbon Cycle Sun Yat-sen University State Key Laboratory of Tibetan Plateau Earth System Resources and Environment Institute of Tibetan Plateau Research Chinese Academy of Sciences Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province Hainan University Sino-French Institute for Earth System Science College of Urban and Environmental SciencesPeking University Schiller Institute for Integrated Science and Society Department of Earth and Environmental Sciences Boston College Institute of Energy Environment and Economy Tsinghua University Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)

China is among the top nitrous oxide（N2O）-emitting countries, but existing national inventories do not provide full-scale emissions including both natural and anthropogenic sources. We conducted a four-decade（1980–2020） of comprehensive quantification of Chinese N2O inventory using empirical emission factor method for anthropogenic sources and two up-to-date process-based models for natural sources. Total N2O emissions peaked at 2287.4（1774.8–2799.9） Gg N2O yr-1in 2018, and agriculture-developed regions, like the East, Northeast, and Central, were the top N2O-emitting regions. Agricultural N2O emissions have started to decrease after 2016 due to the decline of nitrogen fertilization applications, while, industrial and energetic sources have been dramatically increasing after 2005. N2O emissions from agriculture, industry,energy, and waste represented 49.3%, 26.4%, 17.5%, and 6.7% of the anthropogenic emissions in 2020,respectively, which revealed that it is imperative to prioritize N2O emission mitigation in agriculture,industry, and energy. Natural N2O sources, dominated by forests, have been steadily growing from 317.3（290.3–344.1） Gg N2O yr-1in 1980 to 376.2（335.5–407.2） Gg N2O yr-1in 2020. Our study produces a Full-scale Annual N2O dataset in China（FAN2020）, providing emergent counting to refine the current national N2O inventories.

关键词： nitrous oxide four decades anthropogenic sources natural sources

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Industrial land expansion in rural China threatens environmental securities

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Frontiers of Environmental Science & Engineering 2021年第2期15卷 127-139页

作者： Chi Zhang Wenhui Kuang Jianguo Wu Jiyuan Liu hanqin tian Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection Linyi UniversityLinyi 276000China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China School of Life Sciences&School of Sustainability Arizona State UniversityTempeAZ 85287USA International Center for Climate and Global Change Research School of Forestry and Wildlife SciencesAuburn UniversityAuburnAL 36849USA

China’s rural industrialization has been a major driver for its rapid economic growth during the recent decades,but its myriad environmental risks are yet to be fully *** on a comprehensive national land-use data set,our study shows that the area of China’s rural industrial land(RIL)quadrupled during 1990–2015,reaching 39338 km2 in 2015,comparable to urbanization in magnitude but with a much greater degree of landscape fragmentation which implies stronger ecological and environmental *** 91%of the protected areas in the central China were within 50 km from rural industrial land,thus exposed to industrial *** rural industrial land expansion,particularly in regions under high geo-hazard risks,led to dramatically increased environmental risks,threatening the safety and health of both rural industrial workers and ***,negative effects from rural industrial land expansion could partially offset the crop production growth in recent *** underprivileged rural population in the west bears a disproportionally large share of the increased environmental *** urgently needs to design and implement sustainable policies to restrict and reshape its rural *** study aims to inspire policy makers and researchers to rethink the current model of industrial expansion and improve rural industrial land planning,which is important for achieving the sustainable development goals of China.

关键词： Industrialization Land-use change Environment risks Environmental security Urbanization China

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Response patterns of simulated corn yield and soil nitrous oxide emission to precipitation change

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Ecological Processes 2023年第1期12卷 247-259页

作者： Navneet Kaur Dafeng Hui Daniel M.Riccuito Melanie A.Mayes hanqin tian Department of Biological Sciences Tennessee State UniversityNashvilleTN 37209USA Environmental Sciences Division and Climate Change Science Institute Oak Ridge National LaboratoryOak RidgeTNUSA Schiller Institute for Integrated Science and Society Department of Earth and Environmental SciencesBoston CollegeChestnut HillMAUSA

Background Precipitation plays an important role in crop production and soil greenhouse gas ***,how crop yield and soil nitrous oxide(N_(2)O)emission respond to precipitation change,particularly with different background precipitations(dry,normal,and wet years),has not been well *** this study,we examined the impacts of precipitation changes on corn yield and soil N_(2)O emission using a long-term(1981-2020,40 years)climate dataset as well as seven manipulated precipitation treatments with different background precipitations using the DeNitrification-DeComposition(DNDC)*** Results showed large variations of corn yield and precipitation but small variation of soil N_(2)O emission among 40 *** corn yield and soil N_(2)O emission showed near linear relationships with precipitation based on the long-term precipitation data,but with different response patters of corn yield and soil N_(2)O emission to precipitation *** yield showed a positive linear response to precipitation manipulations in the dry year,but no response to increases in precipitation in the normal year,and a trend of decrease in the wet *** extreme drought treatments reduced corn yield sharply in both normal and wet *** contrast,soil N_(2)O emission mostly responded linearly to precipitation *** in precipitation in the dry year reduced more soil N_(2)O emission than those in the normal and wet years,while increases in precipitation increased more soil N_(2)O emission in the normal and wet years than in the dry *** This study revealed different response patterns of corn yield and soil N_(2)O emission to precipitation and highlights that mitigation strategy for soil N_(2)O emission reduction should consider different background climate conditions.

关键词： Background precipitation DNDC model Precipitation change Response pattern Yield Soil N_(2)O emission

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Spatiotemporal variations of carbon flux and nitrogen deposition flux linked with climate change at the centennial scale in China

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Science China Earth Sciences 2020年第5期63卷 731-748页

作者： Dongdong GAO Li DAN Guangzhou FAN hanqin tian Jing PENG Xiujing YANG Fuqiang YANG Yueyue LI Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Atmospheric Science Chengdu University of Information EngineeringChengdu 610225China International Center for Climate and Global Change Research Auburn UniversityAL 36849USA Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

The spatial and temporal variations of the vegetation carbon flux in China from 1901 to 2005 were studied using the vegetation net primary production(NPP)values from seven Earth-system *** addition,the temporal and spatial changes in the nitrogen deposition flux in China were studied using the NHx and NOy fluxes from 1901 to *** relationship between changes in the carbon flux,nitrogen flux and climate was *** results show that(1)over the past 100 years,NPP in China has shown an upward *** average trend coefficient is 0.88 and the NPP distribution trend is generally low in the north and high in the south,with a gradual increase from the northwest to the ***,precipitation and radiation are all conducive to plant growth in the direction of the *** correlation coefficients between the ensemble model mean NPP and temperature,precipitation,longwave radiation and shortwave radiation are 0.88,0.73,0.91 and 0.67,respectively.(2)In the past 100 years,the NHx and NOy fluxes in China have shown an upward trend,with trend coefficients of 0.98 and 0.98,respectively,which pass the 99.9%confidence level of the *** and NOy fluxes are also generally low in the north and high in the south,with a gradual increase from the northwest to the southeast in a step-like pattern.(3)The spatial distribution of the correlation coefficients between the NHx and NOy fluxes and air temperature is similar,with only slight differences in *** spatial distribution of the correlation coefficients between the NHx and NOy fluxes and precipitation is similar in overall pattern,but the pattern is relatively complicated,with a positive-negative-positive-negative-positive pattern occurring across the monsoon region from north to south,and a negative-positive-negative-positive pattern occurring beyond the monsoon region from east to west.(4)The spatial distribution of the correlation coefficients between the NHx and NOy fluxes and NPP shows a ge

关键词： Net primary production(NPP) Temperature Precipitation NHx NOy

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Climate change induced eutrophication of cold-water lake in an ecologically fragile nature reserve

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Journal of Environmental Sciences 2019年第1期31卷 359-369页

作者： Xiaotian Lu Yonglong Lu Deliang Chen Chao Su Shuai Song Tieyu Wang hanqin tian Ruoyu Liang Meng Zhang Kifayatullah Khan State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Earth Sciences Goteborg University International Center for Climate and Global Change Research School of Forestry and Wildlife Sciences Auburn University Department of Environmental and Conservation Sciences University of Swat

Aquatic ecosystem sustainability around the globe is facing crucial challenges because of increasing anthropogenic and natural disturbances. In this study, the tianchi Lake, a typical cold-water lake and a UNESCO/MAB(Man and Biosphere) nature reserve located in high latitude and elevation with the relatively low intensity of human activity was chosen as a system to examine the linkages between climate change and eutrophication. As a part of the UNESCO Bogda Man and Biosphere Reserve, tianchi Lake has been well preserved for prevention from human intervention, but why has it been infected with eutrophication recent years? Our results show that climate change played a significant role in the eutrophication in the tianchi Lake. Increased temperature, changed precipitation pattern and wind-induced hydrodynamic fluctuations in the summer season were suggested to make a major contribution to the accelerated eutrophication. The results also showed that the local temperature and precipitation changes were closely linked to the large-scale atmospheric circulation, which opens the door for the method to be applied in other regions without local climatic information. This study suggests that there is an urgent need to take into consideration of climate change adaptation into the conservation and management of cold-water lakes globally.

关键词： Eutrophication Climate change Atmospheric circulation Alpine lakes

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Methane emissions from livestock in East Asia during 1961−2019

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Ecosystem Health and Sustainability 2021年第1期7卷 147-158页

作者： Lei Zhang hanqin tian Hao Shi Shufen Pan Xiaoyu Qin Naiqing Pan Shree R.S.Dangal State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina International Center for Climate and Global Change Research School of Forestry and Wildlife SciencesAuburn UniversityAuburnALUSA School of Natural Resources University of NebraskaLincolnNEUSA

Context:East Asia is a crucial region in the global methane(CH4)budget,with significant contributions from the livestock ***,the long-term trend and spatial pattern of CH4 emissions from livestock in this region have not been fully ***:Here,we estimate CH4 emissions from 10 categories of livestock in East Asia during 1961-2019 following the Tier 2 approaches suggested by the 2019 Refinement to the IPCC 2006 ***:livestock-sourced CH4 emission in 2019 was 13.22[11.42-15.01](mean[minimum%maximum of 95-confidence interval]Tg CH4 yr-1,accounting for an increase of 231%since *** contribution of slaughtered populations to total emissions increased from 3%in 1961 to 24%in ***,the emission hotspots were mostly distributed in eastern China,South Korea,and parts of Japan,but they tend to shift northward after ***:It is necessary to use dynamic emission factors and include slaughtered populations in the estimation of livestock CH4 *** including Northern China,Mongolia,and South Korea deserve more attention in future CH4 mitigation efforts.

关键词： CH4 emissions livestock dynamic emission factors live and slaughtered populations East Asia

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Global pattern and change of cropland soil organic carbon during 1901-2010: Roles of climate, atmospheric chemistry, land use and management

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Geography and Sustainability 2020年第1期1卷 59-69页

作者： Wei Ren Kamaljit Banger Bo Tao Jia Yang Yawen Huang hanqin tian Department of Plant&Soil Sciences College of AgricultureFood and EnvironmentUniversity of KentuckyLexingtonKY 40506USA Plant Agriculture-University of Guelph Ontario N1G 2W1Canada Department of Forestry Mississippi State UniversityMississippi StateMS 39762USA International Center for Climate and Global Change Research and School of Forestry and Wildlife Sciences Auburn UniversityAuburnAL 36849USA

Soil organic carbon(SOC)in croplands is a key property of soil quality for ensuring food security and agricultural sustainability,and also plays a central role in the global carbon(C)*** managed sustainably,soils may play a critical role in mitigating climate change by sequestering C and decreasing greenhouse gas emissions into the ***,the magnitude and spatio-temporal patterns of global cropland SOC are far from well constrained due to high land surface heterogeneity,complicated mechanisms,and multiple influencing ***,we use a process-based agroecosystem model(DLEM-Ag)in combination with diverse spatially-explicit gridded environmental data to quantify the long-term trend of SOC storage in global cropland area during 1901-2010 and identify the relative impacts of climate change,elevated CO2,nitrogen deposition,land cover change,and land management practices such as nitrogen fertilizer use and *** results show that the total SOC and SOC density in the 2000s increased by 125%and 48.8%,respectively,compared to the early 20th *** SOC increase was primarily attributed to cropland expansion and nitrogen fertilizer *** analysis suggests that climate change reduced approximately 3.2%(or 2,166 Tg C)of the total SOC over the past 110 *** results indicate that croplands have a large potential to sequester C through implementing better land use management practices,which may partially offset SOC loss caused by climate change.

关键词： Global cropland Soil organic carbon Climate change Land management Process-based modeling

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Recent patterns of terrestrial net primary production in Africa influenced by multiple environmental changes

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Ecosystem Health and Sustainability 2015年第5期1卷 34-48页

作者： Shufen Pan Shree R.S.Dangal Bo Tao Jia Yang hanqin tian International Center for Climate and Global Change Research School of Forestry and Wildlife SciencesAuburn UniversityAuburnAlabama 36849 USA

Terrestrial net primary production(NPP)is of fundamental importance to food security and ecosystem ***,little is known about how terrestrial NPP in African ecosystems has responded to recent changes in climate and other environmental ***,we used an integrated ecosystem model(the dynamic land ecosystem model;DLEM)to simulate the dynamic variations in terrestrial NPP of African ecosystems driven by climate and other environmental factors during *** estimate a terrestrial NPP of 10.22(minimum-maximum range of 8.9-11.3)Pg C/yr during the study *** results show that precipitation variability had a significant effect on terrestrial NPP,explaining 74%of interannual variations in *** the 30-yr period,African ecosystems experienced an increase in NPP of 0.03 Pg C/yr,resulting from the combined effects of climate variability,elevated atmospheric CO_(2)concentration,and nitrogen *** further analyses show that there is a difference in NPP of 1.6 Pg C/yr between wet and dry years,indicating that interannual climatic variations play an important role in determining the magnitude of terrestrial *** Africa,dominated by tropical forests,was the most productive region and accounted for 50%of the carbon sequestered as NPP in *** results indicate that warmer and wetter climatic conditions,together with elevated atmospheric CO_(2)concentration and nitrogen deposition,have resulted in a significant increase in African terrestrial NPP during 1980-2009,with the largest contribution from tropical forests.

关键词： Africa climate change dynamic land ecosystem model elevated CO_(2)concentration net primary production terrestrial ecosystems

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