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Forest management required for consistent carbon sink in China’s forest plantations

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Forest Ecosystems 2021年第4期8卷 726-734页

作者： Zhen Yu Weibin You Evgenios Agathokleous guoyi zhou Shirong Liu Institute of Ecology Jiangsu Key Laboratory of Agricultural MeteorologyNanjing University of Information Science&TechnologyNanjing 210044China Key Laboratory of Forest Ecology and Environment China’s National Forestry and Grassland AdministrationInstitute of Forest EcologyEnvironment and ProtectionChinese Academy of ForestryBeijing 100091China College of Forestry Fujian Agriculture and Forestry UniversityFuzhou 350002China

Background:Forest is the largest biomass carbon(C)pool in China,taking up a substantial amount of atmospheric carbon *** it is well understood that planted forests(PFs)act as a large C sink,the contribution of human management to C storage enhancement remains ***,existing projections of forest C dynamics suffer from spatially inconsistent age and type information or neglected human management *** this study,using developed PF age and type maps and data collected from 1371 forest plantation sites in China,we simulated biomass C stock change and quantified management impacts for the time period ***:Results show that future forest biomass C increment might have been overestimated by 32.5%-107.5% in former *** also found that age-related growth will be by far the largest contributor to PF biomass C increment from 2010 to 2050(1.23±0.002 Pg C,1 Pg=10^(15) g=1 billion metric tons),followed by the impact of human management(0.57±0.02 Pg C),while the contribution of climate is slight(0.087±0.04 Pg C).Besides,an additional 0.24±0.07 Pg C can be stored if current PFs are all managed by 2050,resulting in a total increase of 2.13±0.05 Pg ***:Forest management and age-related growth dominate the biomass C change in PFs,while the effect of climatic factors on the accumulation is *** achieve the ambitious goal of forest C stock enhancement by 3.5 Pg from 2020 to 2050,we advocate to improve the management of existing forests and reduce the requests for more lands for forest expansion,which helps mitigate potential conflicts with agricultural *** results highlight that appropriate planning and management are required for sustaining and enhancing biomass C sequestration in China’s PF.

关键词： Planted forest Human management Forest biomass carbon Forest age Forest expansion Climate change

Sensitivity of forest phenology in China varies with proximity to forest edges

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Forest Ecosystems 2023年第6期10卷 647-655页

作者： Weibin You Ziyi Xian guoyi zhou Evgenios Agathokleous Zhen Yu College of JunCao Science and Ecology Fujian Agriculture and Forestry UniversityFuzhou 350002China Fujian Southern Forest Resources and Environmental Engineering Technology Research Center College of ForestryFujian Agriculture and Forestry UniversityFuzhou 350002China Key Laboratory of Ecosystem Carbon Source and Sink China Meteorological Administration(ECSS-CMA)School of Applied MeteorologyNanjing University of Information Science and TechnologyNanjing 210044China Research Center for Global Changes and Ecosystem Carbon Sequestration&Mitigation Nanjing University of Information Science&TechnologyNanjing 210044China

Background:Shifts in forest phenological events serve as strong indicators of climate ***,the sensitivity of phenology events to climate change in relation to forest origins has received limited ***,it is unknown whether forest phenology changes with the proximity to forest ***:This study examined the green-up dates,dormancy dates,time-integrated NDVI(LiNDVI,a measure of vegetation productivity in growing season),and their sensitivities to climatic factors along the gradients of distance(***)to forest edge(0–2 km)in China's natural forests(NF)and planted forests(PF).For the analysis,field-surveyed data were integrated with Moderate Resolution Imaging Spectroradiometer(MODIS)NDVI from 2000 to ***:Our results reveal that PF had earlier green-up dates,later dormancy dates,and higher LiNDVI than ***,green-up sensitivities to temperature were higher at the edges of NF,whereas no such pattern was observed in ***,the sensitivity of dormancy dates remains relatively stable from the inner to the edge of both NF and PF,except for a quadratic change in dormancy date sensitivity to precipitation found in ***,we found that the green-up sensitivity to temperature increased with decreasing proximity to edge in NF evergreen forests,while it showed the opposite trend in PF evergreen ***,we observed that the precipitation impact on green-up dates shifts from postponing to advancing from the inner to the edge of NF,whereas precipitation dominantly postpones PF's green-up dates regardless of the proximity to *** LiNDVI exhibits higher sensitivity to precipitation at the edge areas,a phenomenon observed in NF but not in ***:These results suggest that the responses of forests to climate change vary with the distance to the *** increasing edge forests,which results from fragmentation caused by global changes,we anticipate that desynchronized phenological events along th

关键词： Phenology sensitivity Edge effects Planted forests Natural forests Climate change

Pitfalls in forest carbon sink projection

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Journal of Forestry Research 2024年第6期35卷 368-372页

作者： Yanli Dong Zhen Yu Evgenios Agathokleous guoyi zhou Shirong Liu Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science and TechnologyNanjing 210044People’s Republic of China Key Laboratory of Ecosystem Carbon Source and Sink China Meteorological Administration(ECSS-CMA)Nanjing University of Information Science and TechnologyNanjing 210044People’s Republic of China Institute of Ecology and School of Ecology Applied Meteorology Nanjing University of Information Science and TechnologyNanjing 210044People’s Republic of China Key Laboratory of Forest Ecology and Environment China’s National Forestry and Grassland AdministrationInstitute of Forest EcologyEnvironment and ProtectionChinese Academy of ForestryBeijing 100091People’s Republic of China

Global forests are increasingly crucial for achiev-ing net-zero carbon emissions,with a quarter of the miti-gation efforts under the Paris Climate Agreement directed towards *** China,forests currently contribute to 13%of the global land’s carbon sink,but their stability and per-sistence remain *** examined and identified that published studies suffered from oversimplifications of eco-system succession and tree demographic dynamics,as well as poor constraints on land ***,substan-tial estimations might have been suffered from underrepre-sented or ignored crucial factors,including tree demographic dynamics,and disturbances and habitat shifts caused by global climate *** argue that these essential factors should be considered to enhance the reliability and accuracy of assessments of the potential for forest carbon sinks.

关键词： forest carbon forests

Effect of N and P addition on soil organic C potential mineralization in forest soils in South China

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Journal of Environmental Sciences 2008年第9期20卷 1082-1089页

作者： OUYANG, Xuejun zhou, guoyi HUANG, Zhongliang zhou, Cunyu LI, Jiong SHI, Junhui ZHANG, Deqiang South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China College of Horticulture and Gardening Yangtze University Jingzhou 434025 China Xinjiang Academy of Forest Sciences Urumqi 830002 China

Atmospheric nitrogen deposition is at a high level in some forests of South China. The effects of addition of exogenous N and P on soil organic carbon mineralization were studied to address: (1) if the atmospheric N deposition promotes soil C storage through decreasing mineralization; (2) if the soil available P is a limitation to organic carbon mineralization. Soils (0–10 cm) was sampled from monsoon evergreen broad-leaved forest (MEBF), coniferous and broad-leaved mixed forest (CBMF), and Pinus massoniana...

关键词： addition inorganic N available P mineralization soil organic C South China

Changes in leaf nutrient traits and photosynthesis of four tree species: effects of elevated [CO_(2)], N fertilization and canopy positions

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Journal of Plant Ecology 2012年第4期5卷 376-390页

作者： Juxiu Liu Deqiang Zhang guoyi zhou Honglang Duan Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China

Aims Leaf traits of trees exposed to elevated[CO_(2)]in association with other environmental factors are poorly understood in tropical and subtropical *** goal was to investigate the impacts of elevated[CO_(2)]and N fertilization on leaf traits in southern *** Four tree species,Schima superba *** Champ.(***),Ormosia pinnata(Lour.)Merr(***),Castanopsis hystrix ***.(***)and Acmena acuminatissima(Blume)*** Perry(***)were studied in a factorial combination of atmospheric[CO_(2)](ambient at~390μmol mol^(-1)and elevated[CO_(2)]at~700μmol mol^(-1))and N fertilization(ambient and ambient+100 kg N ha^(-1)year^(-1))in open-top chambers in southern China for 5 *** mass per unit leaf area(LMA),leaf nutrient concentration and photosynthesis(A_(sat))were *** Findings Results indicated that leaf traits and photosynthesis were affected differently by elevated[CO_(2)]and N fertilization among ***[CO_(2)]decreased LMA in all species,while N fertilization did not affect *** mass-based N concentration(N_(M))was significantly greater in *** and *** grown in elevated[CO_(2)]but was lower in *** mass-based P concentration(P_(M))was significantly greater in *** and *** exposed to elevated[CO_(2)]but was lower in ***.N fertilization significantly increased P_(M) in *** but decreased P_(M) in *** stimulation in ***,*** and *** was sustained after 5 years of CO_(2)fumigation.N fertilization did not modify the effects of elevated[CO_(2)]on *** traits(N_(M),N_(A),P_(M),P_(A))and light-saturated photosynthesis were decreased from the upper to lower *** position did not alter the responses of leaf traits and photosynthesis to elevated[CO_(2)].Results suggest that photosynthetic stimulation by elevated[CO_(2)]in native species in subtropical regions may be sustained in th

关键词： photosynthesis elevated CO_(2) nitrogen phosphorus subtropical China

Rates of litter decomposition in terrestrial ecosystems:global patterns and controlling factors

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Journal of Plant Ecology 2008年第2期1卷 85-93页

作者： Deqiang Zhang Dafeng Hui Yiqi Luo guoyi zhou South China Institute of Botany Chinese Academy of SciencesGuangzhou 510650China Department of Botany and Microbiology University of OklahomaNormanOK 73019USA Department of Biological Sciences Tennessee State University3500 John A.Merritt Blvd.NashvilleTennessee 37209USA

Aims We aim to construct a comprehensive global database of litter decomposition rate(k value)estimated by surface floor litterbags,and investigate the direct and indirect effects of impact factors such as geographic factors(latitude and altitude),climatic factors(mean annual tempePlrature,MAT;mean annual precipitation,MAP)and litter quality factors(the contents of N,P,K,Ca,Mg and C:N ratio,lignin:N ratio)on litter *** We compiled a large data set of litter decomposition rates(k values)from 110 research sites and conducted simple,multiple regression and path analyses to explore the relationship between the k values and impact factors at the global *** findings The k values tended to decrease with latitude(LAT)and lignin content(LIGN)of litter but increased with temperature,precipitation and nutrient concentrations at the large spatial *** factor such as climate,litter quality and geographic variable could not explain litter decomposition rates ***,the combination of total nutrient(TN)elements and C:N accounted for 70.2%of the variation in the litter decomposition *** combination of LAT,MAT,C:N and TN accounted for 87.54%of the variation in the litter decomposition *** results indicate that litter quality is the most important direct regulator of litter decomposition at the global *** data synthesis revealed significant relationships between litter decomposition rates and the combination of climatic factor(MAT)and litter quality(C:N,TN).The global-scale empirical relationships developed here are useful for a better understanding and modeling of the effects of litter quality and climatic factors on litter decomposition rates.

关键词： climatic factors geographic factors litter decomposition rate litter quality path analysis terrestrial ecosystems

Integrating a model with remote sensing observations by a data assimilation approach to improve the model simulation accuracy of carbon flux and evapotranspiration at two flux sites

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Science China Earth Sciences 2016年第2期59卷 337-348页

作者： ZHANG TingLong SUN Rui PENG ChangHui zhou guoyi WANG ChunLing ZHU QiuAn YANG YanZheng College of Resources and Environmental Science Northwest A&F University Laboratory of Ecosystems Forecasting and Global Change College of Forestry Northwest A&F University State Key Laboratory of Remote Sensing Science Co-sponsored by Beijing Normal University and IRSA School of Geography and Remote Sensing Sciences Beijing Normal University Institute of Environment Sciences Department of Biological Sciences University of Quebec at Montreal South China Botanical Garden Chinese Academy of Sciences

Model simulation and in situ observations are often used to research water and carbon cycles in terrestrial ecosystems, but each of these methods has its own advantages and limitations. Combining these two methods could improve the accuracy of quantifying the dynamics of the water and carbon fluxes of an ecosystem. Data assimilation is an effective means of integrating modeling with in situ observation. In this study, the ensemble Kalman filter(En KF) and the unscented Kalman filter(UKF) algorithms were used to assimilate remotely sensed leaf area index(LAI) data with the Biome-BGC model to simulate water and carbon fluxes at the Harvard Forest Environmental Monitoring Site(EMS) and the Dinghushan site. After MODIS LAI data from 2000–2004 were assimilated into the improved Biome-BGC model using the En KF algorithm at the Harvard Forest site, the R2 between the simulated and observed results for NEE and evapotranspiration increased by 7.8% and 4.7%, respectively. In addition, the sum of the absolute error(SAE) and the root mean square error(RMSE) of NEE decreased by an average of 21.9% and 26.3%, and the SAE and RMSE of evapotranspiration decreased by 24.5% and 25.5%, respectively. MODIS LAI data of 2003 were assimilated into the Biome-BGC model for the Dinghushan site, and the R2 values between the simulated and observed results for NEE and evapotranspiration were increased by 6.7% and 17.3%, respectively. In addition, the SAE values of NEE and ET were decreased by 11.3% and 30.7%, respectively, and the RMSE values of NEE and ET decreased by 10.1% and 30.9%, respectively. These results demonstrate that the accuracy of carbon and water flux simulations can be effectively improved when remotely sensed LAI data are properly integrated with ecosystem models through a data assimilation approach.

关键词： Net ecosystem exchange Ensemble Kalman filter Unscented Kalman filter Biome-BGC model Leaf area index

Reduced turnover rate of topsoil organic carbon in old-growth forests:a case study in subtropical China

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Forest Ecosystems 2021年第4期8卷 778-788页

作者： Xin Xiong Juxiu Liu guoyi zhou Qi Deng Huiling Zhang Guowei Chu Ze Meng Deqiang Zhang Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystem South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China Center for Plant Ecology Core Botanical GardensChinese Academy of SciencesGuangzhou 510650China School of Applied Meteorology Nanjing University of Information Science&TechnologyNanjing 210044China

Background:Old-growth forests are irreplaceable with respect to climate change mitigation and have considerable carbon(C)sink potential in ***,the relationship between the soil organic carbon(SOC)turnover rate and forest development is poorly understood,which hinders our ability to assess the C sequestration capacity of soil in old-growth ***:In this study,we evaluated the SOC turnover rate by calculating the isotopic enrichment factor β(defined as the slope of the regression between ^(13)C natural abundance and log-transformed C concentrations)along 0-30 cm soil profiles in three successional forests in subtropical China.A lower β(steeper slope)is associated with a higher turnover *** three forests were a 60-year-old *** forest(PF),a 100-year-old coniferous and broadleaved mixed forest(MF),and a 400-year-old monsoon evergreen broadleaved forest(BF).We also analyzed the soil physicochemical properties in these forests to examine the dynamics of SOC turnover during forest succession and the main ***:The β value for the upper 30-cm soils in the BF was significantly(p<0.05)higher than that in the PF,in addition to the SOC stock,although there were nonsignificant differences between the BF and *** β value was significantly(p<0.05)positively correlated with the soil recalcitrance index,total nitrogen,and available nitrogen contents but was significantly(p<0.01)negatively correlated with soil ***:Our results demonstrate that SOC has lower turnover rates in old-growth forests,accompanied by higher soil chemical recalcitrance,nitrogen status,and lower soil *** finding helps to elucidate the mechanism underlying C sequestration in old-growth forest soils,and emphasizes the important value of old-growth forests among global C sinks.

关键词： Forest succession Old-growth forests Soil organic carbon Turnover rate 13C natural abundance

Soil microbial biomass and community responses to experimental precipitation change:A meta-analysis

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Soil Ecology Letters 2020年第2期2卷 93-103页

作者： Shan Xu Weixin Geng Emma JSayer guoyi zhou Ping zhou Chengshuai Liu Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Guangdong Institute of Eco-environmental Science&TechnologyGuangzhou 510650China Guangzhou Institute of Geography Chinese Academy of SciencesGuangzhou 510070China Lancaster Environment Centre Lancaster UniversityLancasterLA14YQUK Smithsonian Tropical Research Institute Apartado 0843-03092BalboaAnconPanama Institute of Ecology Nanjing University of Information Science&TechnologyNanjing 210044China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China

The activity of soil microbes is strongly constrained by water ***,it is unclear how microbial activity responds to spatial and temporal changes in precipitation,particularly to long-term precipitation *** identify the spatiotemporal patterns of microbial responses to precipitation changes of differing durations,we conducted a meta-analysis of data from 95 field studies with drought treatments and 109 field studies with elevated precipitation *** results indicated that microbial biomass carbon(MBC)decreased by 17% under drought and increased by 18% under elevated *** all studies,the phospholipid fatty acid(PLFA)biomarkers for fungi and bacteria decreased significantly under drought but increased under elevated *** addition,the negative effect of drought on MBC tended to be greater at sites with a high aridity index,but the effect of elevated precipitation on MBC did not differ among *** importantly,the responses of MBC,fungal and bacterial PLFA abundance did not vary with treatment duration under drought,but under elevated precipitation,they increased in the first five years of treatment and declined *** results are important for our prediction of microbial responses to long-term precipitation change,because they imply that microbes acclimate to long-term elevated precipitation.

关键词： Drought Precipitation change Microbial biomass Microbial community Treatment duration