检索结果-南通市图书馆

How forest age impacts on net primary productivity: Insights from future multi-scenarios

forest Ecosystems 2024年第5期11卷 708-719页

作者： Lei Tian Yu Tao Simms Joanna Annikki Mäakelä Mingyang Li Co-Innovation Center for Sustainable forestry in Southern China Nanjing Forestry UniversityNanjingChina Faculty of Agriculture and forestry University of HelsinkiHelsinkiFinland

forest net primary productivity(NPP)constitutes a key flux within the terrestrial ecosystem carbon cycle and serves as a significant indicator of the forests carbon sequestration capacity,which is closely related to forest *** its significance,the impact of forest age on NPP is often ignored in future NPP ***,we mapped forest age in Hunan Province at a 30-m resolution utilizing a combination of Landsat time series stack(LTSS),national forest inventory(NFI)data,and the relationships between height and ***,NPP was derived from NFI data and the relationships between NPP and age was built for various forest *** forest NPP was predicted based on the NPP-age relationships under three future scenarios,assessing the impact of forest age on *** findings reveal substantial variations in forest NPP in Hunan Province under three future scenarios:under the age-only scenario,NPP peaks in 2041(133.56TgC·yr^(−1)),while NPP peaks three years later in 2044(141.14TgC·yr^(−1))under the natural development *** maximum afforestation scenario exhibits the most rapid increase in NPP,with peaking in 2049(197.95TgC·yr^(−1)).However,with the aging of the forest,NPP is projected to then decrease by 7.54%,6.07%,and 7.47%in 2060,and 20.05%,19.74%,and 28.38%in 2100,respectively,compared to their peaks under the three *** indicates that forest NPP will continue to decline *** the age structure of forests through selective logging,afforestation and reforestation,and encouraging natural regeneration after disturbance could mitigate this declining trend in forest NPP,but implications of these measures on the full forest carbon balance remain to be *** from the future multi-scenarios are expected to provide data to support sustainable forest management and national policy development,which will inform the achievement of carbon neutrality goals by 2060.

关键词： Net primary productivity forest age NPP-age relationships NPP projections Afforestation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mapping forest age using National forest Inventory,airborne laser scanning,and Sentinel-2 data

引用

forest Ecosystems 2020年第4期7卷 793-806页

作者： Johannes Schumacher Marius Hauglin Rasmus Astrup Johannes Breidenbach National forest Inventory Norwegian Institute of Bioeconomy ResearchÅsNorway

Background:The age of forest stands is critical information for forest management and conservation,for example for growth modelling,timing of management activities and harvesting,or decisions about protection ***,area-wide information about forest stand age often does not *** this study,we developed regression models for large-scale area-wide prediction of age in Norwegian *** model development we used more than 4800 plots of the Norwegian National forest Inventory(NFI)distributed over Norway between latitudes 58°and 65°N in an 18.2 Mha study *** variables were based on airborne laser scanning(ALS),Sentinel-2,and existing public map *** performed model validation on an independent data set consisting of 63 spruce stands with known ***:The best modelling strategy was to fit independent linear regression models to each observed site index(SI)level and using a SI prediction map in the application of the *** most important predictor variable was an upper percentile of the ALS heights,and root mean squared errors(RMSEs)ranged between 3 and 31 years(6%to 26%)for SI-specific models,and 21 years(25%)on *** deviance(MD)ranged between^(−1) and 3 *** models improved with increasing SI and the RMSEs were largest for low SI stands older than 100 *** a mapped SI,which is required for practical applications,RMSE and MD on plot level ranged from 19 to 56 years(29%to 53%),and 5 to 37 years(5%to 31%),*** the validation stands,the RMSE and MD were 12(22%)and 2 years(3%),***:Tree height estimated from airborne laser scanning and predicted site index were the most important variables in the models describing ***,we obtained good results,especially for stands with high *** models could be considered for practical applications,although we see considerable potential for improvements if better SI maps were available.

关键词： forest age Lidar Optical satellite images Remote sensing forest inventory

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ground bryophyte species diversity in young spruce forests: effects of forest age and forest structure

Ground bryophyte species diversity in young spruce forests: ...

引用

2012年全国苔藓植物学学术研讨会

作者： Xiao-Li Yan Wei-Kai Bao Xue-Yong Pang Chengdu Institute of Biology Chinese Academy of Sciences Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization Chinese Academy of Sciences Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province

To evaluate important role in biological diversity in young forests, the effect of forest age on ground bryophyte diversity were studied. Furthermore, the relationship between ground bryophyte community and forest structural characteristics was verified to provide suggestion for improving ground bryophyte diversity of young forests. Three young spruce forests (PFⅠ27 years old, PFⅡ34 years old, PFⅢ 39 years old) with similar topographic characteristics were surveyed for the ground bryophyte diversity and forest structure in the upper reaches of the Dadu River, SW China. Shannon-Wiener index was not different significantly among three forests, but PFⅡ and PFⅢ had significantly higher Simpson diversity than PFⅠ. Species composition of ground bryophyte differed greatly among the three forests, which contained high proportion of rare species occurred exclusively in one of the three forests. PFⅢ contained a fewer species with pendant growth than PFⅠand PFⅡ. forest age, herb richness and herb height were important forest structural factors that influenced the distribution of bryophyte. Ground bryophyte Shannon-Wiener diversity was mainly correlated with shrub richness, while Simpson diversity was determined by the forest age. Our results suggested that in the developmental process of young forest, shrub and herb layers have an important role in determining ground bryophyte diversity. In order to improve bryophyte diversity of spruce forests, some relevant forest managements are needed to promote growth of shrub and herb layers.

关键词： ground bryophyte diversity young forests forest structure forest age

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Future biomass carbon sequestration capacity of Chinese forests

引用

Science Bulletin 2018年第17期63卷 1108-1117页

作者： Yitong Yao Shilong Piao Tao Wang Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University Beijing 100871 China Key Laboratory of Alpine Ecology and Biodiversity Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China Center for Excellence in Tibetan Earth Science Chinese Academy of Sciences Beijing 100085. China

Chinese forests, characterized by relatively young stand age, represent a significant biomass carbon （C） sink over the past several decades. Nevertheless, it is unclear how forest biomass C sequestration capacity in China will evolve as forest age, climate and atmospheric CO2 concentration change continuously. Here, we present a semi-empirical model that incorporates forest age and climatic factors for each lbrest type to estimate the effects of forest age and climate change on total forest biomass, under three different sce-narios based on the fifth phase of the Coupled Model Intercomparison Project （CMIPS）. We estimate that age-related forest biomass C sequestration to be 6.69 Pg C （~0.17 Pg C a^-1） from the 2000s to the 2040s. Climate change induces a rather weak increase in total forest biomass C sequestration （0.52-0.60 Pg C by tile 2040s）. We show that rising CO2 concentrations could further increase tile total forest biomass C sequestration by 1.68-3.12 Pg C in the 2040s across all three scenarios. Overall, the total forest biomass in China would increase by 8.89-10.37 Pg C by the end of 2040s. Our findings highlight the benefits of Chinese afforestation programs, continued climate change and increasing CO2. concentration in sustaining the forest biomass C sink in the near future, and could therefore be useful for designing more realistic climate change mitigation policies such as continuous forestation programs and careful choice of tree species.

关键词： forest biomass Carbon sequestration forest age Climate change Rising C02 concentration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Eucalyptus carbon stock estimation in subtropical regions with the modeling strategy of sample plots–airborne LiDAR–Landsat time series data

引用

forest Ecosystems 2023年第6期10卷 700-716页

作者： Xiandie Jiang Dengqiu Li Guiying Li Dengsheng Lu Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education Fujian Normal UniversityFuzhou350117China Institute of Geography Fujian Normal UniversityFuzhou350117China Fujian Provincial Engineering Research Center for forest Carbon Metering Fujian Normal UniversityFuzhou350117China

Updating eucalyptus carbon stock data in a timely manner is essential for better understanding and quantifying its effects on ecological and hydrological *** present,there are no suitable methods to accurately estimate the eucalyptus carbon stock in a large *** research aimed to explore the transferability of the eucalyptus carbon stock estimation model at temporal and spatial scales and assess modeling performance through the strategy of combining sample plots,airborne LiDAR and Landsat time series data in subtropical regions of ***,eucalyptus carbon stock estimates in typical sites were obtained by applying the developed models with the combination of airborne LiDAR and field measurement data;the eucalyptus plantation ages were estimated using the random localization segmentation approach from Landsat time series data;and regional models were developed by linking LiDAR-derived eucalyptus carbon stock and vegetation age(e.g.,months or years).To examine the models’robustness,the developed models at the regional scale were transferred to estimate carbon stocks at the spatial and temporal scales,and the modeling results were evaluated using validation samples *** results showed that carbon stock can be successfully estimated using the age-based models(both age variables in months and years as predictor variables),but the month-based models produced better estimates with a root mean square error(RMSE)of 6.51 t⋅ha1 for Yunxiao County,Fujian Province,and 6.33 t⋅ha1 for Gaofeng forest Farm,Guangxi Zhuang Autonomous ***,the month-based models were superior for estimating the carbon stocks of young eucalyptus plantations of less than two *** model transferability analyses showed that the month-based models had higher transferability than the year-based models at the temporal scale,indicating their possibility for analysis of carbon stock ***,both the month-based and year-based models expressed rela

关键词： forest carbon stock Eucalyptus plantation Airborne LiDAR Landsat time series forest age

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Aboveground carbon sequestration of Cunninghamia lanceolata forests:Magnitude and drivers

引用

forest Ecosystems 2024年第1期11卷 32-41页

作者： Chen Wang Shuguang Liu Yu Zhu Andrew R.Smith Ying Ning Deming Deng National Engineering Laboratory for Applied Technology of forestry&Ecology in South China Central South University of Forestry and TechnologyChangsha 410004China Technology Innovation Center for Ecological Conservation and Restoration in Dongting Lake Basin Ministry of Natural ResourcesChangsha 410007China College of Life Science and Technology Central South University of Forestry and TechnologyChangsha 410004China School of Ecology and Environment Hainan UniversityHaikou 570228China School of Natural Sciences Bangor UniversityGwyneddLL572UWUK College of forestry Central South University of Forestry and TechnologyChangsha 410004China Hunan Prospecting Designing&Research General Institute for Agriculture Forestry&IndustryChangsha 410007China

Understanding the spatial variation,temporal changes,and their underlying driving forces of carbon sequestration in various forests is of great importance for understanding the carbon cycle and carbon management *** carbon density and sequestration in various Cunninghamia lanceolata forests,extensively cultivated for timber production in subtropical China,vary with biodiversity,forest structure,environment,and cultural factors remain poorly explored,presenting a critical knowledge gap for realizing carbon sequestration supply potential through *** on a large-scale database of 449 permanent forest inventory plots,we quantified the spatial-temporal heterogeneity of aboveground carbon densities and carbon accumulation rates in Cunninghamia lanceolate forests in Hunan Province,China,and attributed the contributions of stand structure,environmental,and management factors to the heterogeneity using quantile age-sequence analysis,partial least squares path modeling(PLS-PM),and hot-spot *** results showed lower values of carbon density and sequestration on average,in comparison with other forests in the same climate zone(i.e.,subtropics),with pronounced spatial and temporal ***,quantile regression analysis using carbon accumulation rates along an age sequence showed large differences in carbon sequestration rates among underperformed and outperformed forests(0.50 and 1.80 Mg·ha^(-1)·yr^(-1)).PLS-PM demonstrated that maximum DBH and stand density were the main crucial drivers of aboveground carbon density from young to mature ***,species diversity and geotopographic factors were the significant factors causing the large discrepancy in aboveground carbon density change between low-and high-carbon-bearing *** analysis revealed the importance of culture attributes in shaping the geospatial patterns of carbon *** work highlighted that retaining largesized DBH trees and increasing shade-t

关键词： Carbon density Carbon accumulation rate forest age Spatial variation Cultural influence

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recovery of Collembola in Pinus tabulaeformis Plantations

引用

Pedosphere 2017年第1期27卷 129-137页

作者： CHANG Liang WANG Baifeng LIU Xianghui Mac A.CALLAHAM Jr. GE Feng State Key Laboratory of Integrated Management of Pest and Rodents Institute of ZoologyChinese Academy of Sciences Northeast Institute of Geography and Agroecology Chinese Academy of Sciences USDA Forest ServiceSouthern Research StationCenter for Forest Disturbance Science

Large areas of forest plantations have been developed in China. It is important to evaluate the soil fauna in plantations and the conditions needed for their recovery in view of the large areas of plantations in China. Three Pinus tabulaeformis forests, a 26-year-old plantation （P26） and a 45-year-old plantation （P45）, exposed to clear-cutting before plantation, and an 80 260-year-old natural forest （N260）, were chosen to study the effects of different forest ages/types on Collembola community in the lifter and soil layers during 2008 and 2009. Soil conditions in P26 and P45 were significantly deteriorated when compared to N260. A higher value of soil bulk density and lower values of soil organic matter, soil N, litter depth, soil pH, and soil water content were observed in P26 and P45. Totally, the same genera of Collembola tended to occur in the forests of all ages studied; however, the Collembola community structure was significantly impacted by the differences in forest age. Both in the litter and soil layers, the density and generic richness of the Collembola were the highest in N260 and the lowest in P26. Some collembolan groups were sensitive to soil conditions in particular forest ages. N260 was associated with relatively high abundance of Plutomus collembolans and P45 with relatively high abundance of Pseudofolsomia collembolans. The canonical correspondence analysis showed that the community structure of Collembola was mainly affected by forest age in both litter and soil layer. The ordination analysis of non-metric multidimensional scaling also found that the Collembola community did not recover to the level of natural forests in 26-year regeneration after clear-cutting. Even in 45-year regeneration after clear-cutting, the Collembola community only showed a slight recovery to the level of natural forests. Our results clearly showed that both Collembola community and soil conditions did not recover in 26- and 45-year regeneration after clear-cutting in P.

关键词： community structure forest age litter layer soil conditions soil fauna soil layer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Variations of root and heterotrophic respiration along environmental gradients in China’s forests

引用

Journal of Plant Ecology 2013年第5期6卷 358-367页

作者： Pin Li Yuanhe Yang Jingyun Fang Department of Ecology and Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China

Aims Root and heterotrophic respiration may respond differently to environmental variability,but little evidence is available from largescale *** we aimed to examine variations of root and heterotrophic respiration across broad geographic,climatic,soil and biotic *** We conducted a synthesis of 59 field measurements on root and heterotrophic respiration across China’s *** Findings Root and heterotrophic respiration varied differently with forest types,of which evergreen broadleaf forest was significantly different from those in other forest types on heterotrophic respiration but without statistically significant differences on root *** results also indicated that root and heterotrophic respiration exhibited similar trends along gradients of precipitation,soil organic carbon and satellite-indicated vegetation ***,they exhibited different relationships with temperature:root respiration exhibited bimodal patterns along the temperature gradient,while heterotrophic respiration increased monotonically with ***,they showed different relationships with MOD17 GPP,with increasing trend observed for root respiration whereas insignificant change for heterotrophic *** addition,root and heterotrophic respiration exhibited different changes along the age sequence,with insignificant change for root respiration and decreasing trend for heterotrophic ***,these results suggest that root and heterotrophic respiration may respond differently to environmental *** findings could advance our understanding on the different environmental controls of root and heterotrophic respiration and also improve our ability to predict soil CO_(2) flux under a changing environment.

关键词： enhanced vegetation index forest age heterotrophic respiration latitude mean annual temperature mean annual precipitation root respiration GPP

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Impact of land use conversion on soil organic carbon stocks in an agro-pastoral ecotone of Inner Mongolia

引用

Journal of Geographical Sciences 2017年第8期27卷 999-1010页

作者： ZHAO Wei HU Zhongmin LI Shenggong GUO Qun YANG Hao ZHANG Tonghui Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China Naiman Desertification Research Station Northwest Institute of Eco-Environment and Resources CAS Lanzhou 730000 China

Soil organic carbon （SOC） stocks in terrestrial ecosystems vary considerably with land use types. Grassland, forest, and cropland coexist in the agro-pastoral ecotone of Inner Mongolia, China. Using SOC data compiled from literature and field investigations, this study compared SOC stocks and their vertical distributions among three types of ecosystems. The results indicate that grassland had the Largest SOC stock, which was 1.5- and 1.8-folds more than stocks in forest and cropland, respectively. Relative to the stock in 0-100 cm depth, grassland held more than 40% of its SOC stock in the upper 20 cm soil layer; forest and cropland both held over 30% of their respective SOC stocks in the upper 20 cm soil layer. SOC stocks in grazed grasslands were remarkably promoted after -〉20 years of grazing ex- clusion. Conservational cultivation substantially increased the SOC stocks in cropland, espe- cially in the 0-40 cm depth. Stand ages, tree species, and forest types did not have obvious impacts on forest SOC stocks in the study area likely due to the younger stand ages. Our study implies that soil carbon loss should be taken into account during the implementation of ecological projects, such as reclamation and afforestation, in the arid and semi-arid regions of China.

关键词： soil organic carbon soil carbon profile land use change grazing tillage forest age

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：