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Optimization of vegetation carbon content parameters and their application in carbon storage estimation in China

Science of the Total Environment 2024年 955卷 176912页

作者： Yu, Cong Xu, Li He, Nianpeng Li, Mingxu Kang, Xiaoyan 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 Key Laboratory of Sustainable Forest Ecosystem Management Ministry of Education Northeast Forestry University Harbin150040 China

As a key parameter for C pool and flux assessments, vegetation carbon (C) content can be used in ecological models to predict climate-induced changes in the C sequestration capacity of vegetation. However, the differences in methods for upscaling C content from the organ to the community scale and their impact on regional C stock estimates have been ignored. Based on a comprehensive community structure survey of 72 typical natural ecosystems in China and 27,905 measured samples of plant organs (leaves, twigs, trunks, and roots), we first quantified the differences among scaling-up methods for vegetation C content. These methods included the community or dominant species-weighted mean, geometric mean, arithmetic mean, and traditional empirical coefficients (45 % and 50 %), and their impact on C storage estimation at the regional scale. Comparing the accuracy, variability, and response patterns of the different scaling-up methods, the dominant C species biomass-weighted mean (CDWM) method had the highest similarity to the community-weighted C mean (CCWM) method. Concerning vegetation C storage estimation in China's natural terrestrial ecosystems, the relative errors of the other methods ranged from −2.6 % to 8.22 % compared with that of the CCWM method (18.39 Pg C). The empirical coefficients had the highest uncertainty, with a 45 % empirical coefficient underestimating the vegetation C stock by 2.60 %, and a 50 % empirical coefficient overestimating it by 8.22 %. The CDWM method proposed here has high reliability for C storage estimation (overestimated by only 0.44 %), making it a preferable sampling and scaling-up method for regional C content and stock assessment. Additionally, our study provided the C content of plant organs for China's provinces and typical vegetation types based on the CCWM, which could be used for regional C stock assessment and C cycle models. © 2024 Elsevier B.V.

关键词： Carbon sequestration

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Diversity loss and light limitation threaten the sustainability of ecosystem productivity gains under nitrogen enrichment

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Science of the Total Environment 2025年 958卷 177960页

作者： Zhang, Wenshuo Li, Tingting Li, Jiawen Zhang, Ruiyang Xu, Li Wang, Jinsong Hu, Jian Niu, Shuli Tian, Dashuan Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research CAS Beijing100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing100049 China College of Life Sciences China West Normal University Nanchong637009 China Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station Southwest Minzu University Chengdu610041 China

Plant photosynthesis significantly regulates atmospheric CO₂ but is often limited by nitrogen (N) availability. While N deposition could alleviate this limitation and enhance gross ecosystem productivity (GEP), its long-term effects are uncertain due to potential negative impacts like biodiversity loss and soil acidification. Yet, many long-term N addition experiments emphasize community biomass over gross GEP. Here, we conducted a six-year N addition experiment in an alpine meadow, frequently monitoring GEP, community structure, aboveground net primary productivity (ANPP)and plant traits. We found that N addition significantly enhanced GEP in the first three years, but during 4–6 years this effect disappeared. We further disentangled the mechanisms affecting GEP into biomass-based and non-biomass-based processes. The latter is expressed as biomass-specific GEP, defined as GEP per unit biomass. Differing with GEP, biomass-specific GEP provides a metric of carbon assimilation efficiency normalized to biomass. Unlike previous studies, we found that it was not ANPP, but specific GEP that determined the loss of the short-term N effect. ANPP showed a consistent increase under N addition, whereas specific GEP decreased in the last three years. This specific GEP reduction was primarily regulated by biodiversity loss and increased light limitation under N addition. Overall, our findings suggest that short-term benefits of N deposition on GEP are not sustained in long term, highlighting the need to explore the non-biomass-based mechanisms to better predict ecosystem responses to prolonged N enrichment. © 2024 Elsevier B.V.

关键词： Anthropogenic

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An empirical approach to predict regional organic carbon in deep soils

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Science China Earth Sciences 2023年第3期66卷 583-593页

作者： Jingjing WANG Xiaorong WEI Xiaoxu JIA Mingbin HUANG Zhipeng LIU Yufei YAO Ming’an SHAO State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling 712100China Institute of Soil and Water Conservation Ministry of Water Resources and Chinese Academy of SciencesYangling 712100China CAS Center for Excellence in Quaternary Science and Global Change Xi’an 710061China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China College of Urban and Environmental Sciences Northwest UniversityXi’an 710127China

Deep soil organic carbon(SOC)plays an important role in carbon *** predicting deep SOC at the regional scale is crucial for the accurate assessment of carbon sequestration potential in soils but has been challenging for a ***,we developed a depth distribution function-based empirical approach to predict SOC in deep soils at the regional *** validated this approach with a dataset from four regions of the world and examined the application of this approach in China’s Loess *** found that among the reported depth distribution functions describing vertical patterns of SOC,the negative exponential function performed best in fitting SOC along the soil profile in various ***,the parameters(i.e.,Ceand k)of the negative exponential function were linearly correlated to surface SOC(0–20 cm)and the changing rates of SOC within the topsoil(0–40 cm).Based on the above relationships,the empirical equations for predicting the negative exponential parameters are *** validation results from site-specific and regional dataset showed that combining the negative exponential function and such empirical equations can precisely predict SOC concentration in soils down to 500 cm *** study provides a simple,rapid and accurate method for predicting deep soil SOC at the regional scale,which could simplify the assessment of deep soil SOC in various regions.

关键词： Deep SOC Empirical approach Negative exponential function Depth distribution Spatial pattern

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Cultivated Grassland Development on the Tibetan Plateau:Current Status,Challenges,Suggestions

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Journal of Resources and Ecology 2024年第4期15卷 804-813页

作者： HOU Ge SHI Peili ZHAO Guangshuai CHEN Xueying HUANG Xiaofang DUAN Cheng Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Development Research Center National Forestry and Grassland AdministrationBeijing 100714China University of Chinese Academy of sciences Beijing 100049China

The Tibetan Plateau is vital for animal husbandry in China,and relies heavily on its natural ***,grassland degradation,increasing livestock numbers,and uneven grazing practices are exacerbating the grass-livestock *** grasslands are a key strategy to address this *** this review,we evaluate the current status,challenges,and suggestions for developing and managing Tibetan Plateau cultivated *** discernible advancements have been made in the cultivated grasslands in this region,persistent challenges *** challenges stem from issues like low awareness and enthusiasm among farmers and herders,uneven cultivated grassland distribution,and limited scientific and technological *** on these challenges,we propose strengthening the promotion of artificial forage,implementing a rationalized grassland layout,and improving the scientific and technological contributions to forage species selection,sowing,management,and *** summary,cultivated grasslands in the Tibetan Plateau offer promising prospects but still face significant *** these obstacles will require innovative approaches to unlock the full potential of cultivated grasslands in this unique ecological niche.

关键词： animal husbandry balance of grass and livestock cultivated grassland Tibetan Plateau

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Enhanced dominance of soil moisture stress on vegetation growth in Eurasian drylands

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National Science Review 2023年第8期10卷 135-147页

作者： Yu Zhang Yangjian Zhang Xu Lian Zhoutao Zheng Guang Zhao Tao Zhang Minjie Xu Ke Huang Ning Chen Ji Li Shilong Piao 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 Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University Department of Earth and Environmental Engineering Columbia University College of Agronomy Shenyang Agricultural University Department of Geosciences and Natural Resource Management University of Copenhagen Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Department of Geography School of Geography and Information EngineeringChina University of Geosciences State Key Laboratory of Tibetan Plateau Earth System Resources and Environment Institute of Tibetan Plateau ResearchChinese Academy of Sciences

Despite the mounting attention being paid to vegetation growth and their driving forces for water-limited ecosystems, the relative contributions of atmospheric and soil moisture dryness stress on vegetation growth are an ongoing debate. Here we comprehensively compare the impacts of high vapor pressure deficit(VPD) and low soil water content(SWC) on vegetation growth in Eurasian drylands during 1982–*** analysis indicates a gradual decoupling between atmospheric dryness and soil dryness over this period,as the former has expanded faster than the latter. Moreover, the VPD–SWC relation and VPD–greenness relation are both non-linear, while the SWC–greenness relation is near-linear. The loosened coupling between VPD and SWC, the non-linear correlations among VPD–SWC-greenness and the expanded area extent in which SWC acts as the dominant stress factor all provide compelling evidence that SWC is a more influential stressor than VPD on vegetation growth in Eurasian drylands. In addition, a set of 11 Earth system models projected a continuously growing constraint of SWC stress on vegetation growth towards 2100. Our results are vital to dryland ecosystems management and drought mitigation in Eurasia.

关键词： soil water content vapor pressure deficit vegetation growth decoupling non-linear relation

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Decadal shifts in Qingzang Plateau lake carbon dynamics (1970-2020): From predominant carbon sources to emerging sinks

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Environmental Science and Ecotechnology 2024年第5期21卷 123-132页

作者： Di Shen Yu Li Yafeng Wang Shouliang Huo Yong Liu Junjie Jia Shuoyue Wang Kun Sun Yang Gao College of Earth and Environment Science Lanzhou UniversityLanzhou730000PR China State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing100101PR China Chinese Research Academy of Environmental Sciences Beijing100012PR China College of Environmental Sciences and Engineering Peking UniversityBeijing1008714PR China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101PR China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049PR China

The evasion of carbon dioxide(CO_(2))from lakes significantly influences the global carbon *** global climatic transformations,the role of Qingzang Plateau(QZP)lakes as carbon(C)sources or sinks remains a subject of ***,accurately quantifying their contribution to the global carbon budget presents a formidable ***,spanning half a century(1970e2020),we utilize a synthesis of literature and empirical field data to assess the CO_(2) exchange flux of QZP *** find markedly higher CO_(2) exchange flux in the southeast lakes than that in the northern and western regions from 1970 to *** this time,both freshwater and saltwater lakes served primarily as carbon *** annual CO_(2) exchange flux was estimated at 2.04±0.37 Tg(Tg)C yr1,mainly influenced by temperature *** CO_(2) exchange flux patterns underwent a geographical inversion between 2000 and 2020,with increased levels in the west and decreased levels in the ***,CO_(2) emissions from freshwater lakes diminished,and certain saltwater lakes in the QTP transitioned from carbon sources to *** 2000 to 2020,the annual CO_(2) exchange flux from QZP lakes is estimated at 1.34±0.50 Tg C yr1,with solar radiation playing a more pronounced role in carbon ***,over the past five decades,QZP lakes have generally functioned as carbon ***,the total annual CO_(2) emissions have declined since the year 2000,indicating a potential shift trend from being a carbon source to a sink,mirroring broader patterns of global climate *** findings not only augment our understanding of the carbon cycle in plateau aquatic systems but also provide crucial data for refining China's carbon budget.

关键词： Carbon source Carbon sink Carbon exchange flux Qingzang Plateau Global climate change

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Different responses of soil respiration and its components to nitrogen and phosphorus addition in a subtropical secondary forest

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Forest ecosystems 2021年第3期8卷 491-503页

作者： Junjun Zhang Yong Li Jinsong Wang Weinan Chen Dashuan Tian Shuli Niu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Beijing Key Laboratory of Wetland Services and Restoration Institute of Wetland ResearchChinese Academy of ForestryBeijing 100091China Department of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Background:Nitrogen(N)and phosphorus(P)deposition have largely affected soil respiration(Rs)in forest ***,few studies have explored how N and P individually or in combination to influence Rs and its components(autotrophic respiration,Ra;heterotrophic respiration,Rh),especially in highly P-limited subtropical *** address this question,we conducted a field manipulation experiment with N and/or P addition in a 50-year-old subtropical secondary ***:We found that N addition on average reduced Rs,Ra,and Rh by 15.2%,15%,and 11.7%,respectively during 2-year field study.P addition had an inconsistent effect on Ra,with Ra increasing by 50.5%in the first year but reducing by 26.6%in the second ***,P addition on average decreased Rh by 8.9%–30.9%and Rs by 6.7%–15.6%across 2 *** contrast,N and P co-addition on average increased Rs,Ra,and Rh by 1.9%,7.9%,and 2.1%during the experimental *** Rs and Rh were significantly correlated with soil temperature,their temperature sensitivities were not significantly changed by *** was predominantly regulated by soil nitrogen availability(NH4+and NO3−),soil dissolved organic carbon(DOC),and enzyme activities,while the variation in Rh was mainly attributable to changes in soil microbial community composition and soilβ-D-Cellubiosidase(CB)andβ-Xylosidase(XYL)***:Our findings highlight the contrasting responses of Rs and its components to N or P addition against N and P co-addition,which should be differentially considered in biogeochemical models in order to improve prediction of forest carbon dynamics in the context of N and P enrichment in terrestrial ecosystems.

关键词： Nitrogen deposition Phosphorus enrichment Heterotrophic respiration Autotrophic respiration Enzyme activities Microbial community composition

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

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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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The 30m-NDVI-based Alpine Grassland Changes and Climate Impacts in the Three-River Headwaters Region on the Qinghai-Tibet Plateau from 1990 to 2018

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Journal of Resources and Ecology 2022年第2期13卷 186-195页

作者： SUN Ziyu WANG Junbang 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

The response of long-term vegetation changes and climate change has been a hot topic in recent ***,a Landsat-based fusion model was developed and used to produce a dataset of normalized vegetation index(NDVI)for the Three-River Headwater region on the Qinghai-Tibet Plateau with a spatial resolution of 30 m and the time spanning the nearly 30 years from 1990 to *** this study,the NDVI was applied to an analysis of the spatial and temporal changes in the alpine grassland and the impacts from climate change using the Theil-Sen Median method and linear *** results showed that:(1)The regional mean NDVI was 0.39and showed a spatial pattern of decreasing from the southeast to the northwest in the recent three *** the three parks,the Lancang River Park had the highest NDVI(0.43),followed by the Yellow River Park(0.38)and Yangtze River Park(0.23).(2)An upward trending was found in the NDVI time series at a rate of 0.0031 yr^(-1)(R^(2)=0.62,P<0.01)over the whole period of 1990–*** increasing rate(0.00649 yr^(-1),R^(2)=0.71,P<0.01)in the latter period of 2005–2018 was nearly 2.3 times of that(0.00284 yr^(-1),R^(2)=0.31,P<0.01)in the previous period of1990–*** the latest periods,the three parks experienced rates that were 2.3 to 63 times the corresponding values in the early period.(3)The NDVI is correlated more positively with temperature than *** impacts of climate change decreased along with the coverage fraction from the higher,median and then lower *** climate change can explain 34%of the variability in the NDVI time series of the areas with a higher fraction of grassland coverage,while it was 31%for the median fraction and 20%for the lower *** study is the first to use the 30 m NDVI dataset spanning nearly 30 years to analyze the spatial and temporal variability and climate impacts in the alpine grasslands of the Three-River Headwater region of the Qinghai-Tibet *** results provide a

关键词： Normalized Difference Vegetation Index(NDVI) the Three-River Headwater region alpine grassland climate change

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人为管理措施诱导土壤微生物磷与土壤微生物碳氮内稳态解耦的代谢证据

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Journal of Plant Ecology 2023年第6期16卷 185-196页

作者： Lihua Zhang Lizhi Jia Liyuan He David A.Lipson Yihui Wang Shunzhong Wang Xiaofeng Xu College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Biology Department San Diego State UniversitySan DiegoCA 92182USA

微生物化学计量学理论能够预测微生物对碳(C)、氮(N)、磷(P)的同化作用具有比例耦合性。这种耦合性被量化为稳态值,用于计算内稳性系数(H)。C、N、P的H值协变量表明,微生物对C、N、P的同化作用是耦合的。因此,在本文中我们利用全球数据... 详细信息

微生物化学计量学理论能够预测微生物对碳(C)、氮(N)、磷(P)的同化作用具有比例耦合性。这种耦合性被量化为稳态值,用于计算内稳性系数(H)。C、N、P的H值协变量表明,微生物对C、N、P的同化作用是耦合的。因此,在本文中我们利用全球数据集研究微生物C、N、P的H值在不同生物群落中的时空动态变化。研究结果表明,土地利用和人为管理措施导致P与C、N的代谢在时间和空间上解耦,并且我们利用结构方程模型(SEM)分析结果表明,土壤因子主导P的微生物动态平衡,而土壤元素含量则主导C和N的微生物动态平衡。利用机器学习算法得出的微生物P与微生物C和N的对比因子也证实了这一结果。总的来说,我们的研究强调了在营养循环中人为管理措施对微生物角色转变具有重要的影响。

关键词：碳氮磷微生物的内稳性管理措施

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