检索结果-南通市图书馆

Estimating forest aboveground biomass using HJ-1 Satellite CCD and ICESat GLAS waveform data

Science China Earth Sciences 2010年第S1期53卷 16-25页

作者： GUO ZhiFeng1,CHI Hong1,2 & SUN GuoQing1,3 1State Key Laboratory of Remote Sensing Science,Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University,Institute of Remote Sensing Applications,Chinese Academy of Sciences,Beijing 100101,China 2Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3Department of Geography University of Maryland,College Park,MD 20742,USA 1. State Key Laboratory of Remote Sensing Science Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing 100101 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. Department of Geography University of Maryland College Park MD 20742 USA

The ecosystem in northeastern China and the Russian Far East is a hotspot of scientific research into the global carbon *** aboveground biomass(AGB) is an important component in the land surface carbon *** this study,using forest inventory data and forest distribution data,the AGB was estimated for forest in Daxinganlin in northeastern China by combining charge-coupled device(CCD) data from the Small Satellite for Disaster and Environment Monitoring and Forecast(HJ-1) and Geoscience Laser Altimeter System(GLAS) waveform data from the Ice,Cloud and land Elevation Satellite(ICESat).The forest AGB prediction models were separately developed for different forest types in the research area at GLAS footprint level from GLAS waveform parameters and field survey plot biomass in the Changqing(CQ) Forest Center,which was calculated from forest inventory *** resulted statistical regression models have a R2=0.68 for conifer and R2=0.71 for broadleaf *** models were used to estimate biomass for all GLAS footprints of forest located in the study *** GLAS footprint biomass coupled with various spectral reflectivity parameters and vegetation indices derived from HJ-1 satellite CCD data were used in multiple regression analyses to establish biomass prediction models(R2=0.55 and R2=0.52 for needle and broadleaf respectively).Then the models were used to produce a forest AGB map for the whole study area using the HJ-1 *** data obtained from forest inventory data of the Zhuanglin(ZL) Forest Center were used as independent field measurements to validate the AGB estimated from HJ-1 CCD data(R2=0.71).About 80% of biomass samples had an error less than 20 t ha-1,and the mean error of all validation samples is 5.74 t *** pixel-level biomass map was then stratified into different biomass levels to illustrate the AGB spatial distribution pattern in this *** was found that HJ-1 wide-swath data and GLAS waveform data can be combined to estim

关键词： Disaster and Environment Monitoring and Forecast Satellite ICESat GLAS waveform boreal forest forest aboveground biomass multiple linear regression

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

Effects of long-term warming on the aboveground biomass and species diversity in an alpine meadow on the Qinghai-Tibetan Plateau of China

引用

Journal of Arid Land 2020年第2期12卷 252-266页

作者： WEN Jing QIN Ruimin ZHANG Shixiong YANG Xiaoyan XU Manhou Taiyuan Normal University Jinzhong 030619China

Ecosystems in high-altitude regions are more sensitive and respond more rapidly than other ecosystems to global climate *** Qinghai-Tibet Plateau(QTP)of China is an ecologically fragile zone that is sensitive to global climate *** is of great importance to study the changes in aboveground biomass and species diversity of alpine meadows on the QTP under predicted future climate *** this study,we selected an alpine meadow on the QTP as the study object and used infrared radiators as the warming device for a simulation experiment over eight years(2011-2018).We then analyzed the dynamic changes in aboveground biomass and species diversity of the alpine meadow at different time scales,including an early stage of warming(2011-2013)and a late stage of warming(2016-2018),in order to explore the response of alpine meadows to short-term(three years)and long-term warming(eight years).The results showed that the short-term warming increased air temperature by 0.31℃and decreased relative humidity by 2.54%,resulting in the air being warmer and *** long-term warming increased air temperature and relative humidity by 0.19℃and 1.47%,respectively,and the air tended to be warmer and *** short-term warming increased soil temperature by 2.44℃and decreased soil moisture by 12.47%,whereas the long-term warming increased soil temperature by 1.76℃and decreased soil moisture by 9.90%.This caused the shallow soil layer to become warmer and drier under both short-term and long-term ***,the degree of soil drought was alleviated with increased warming *** the long-term warming,the importance value and aboveground biomass of plants in different families *** importance values of grasses and sedges decreased by 47.56%and 3.67%,respectively,while the importance value of weeds increased by 1.37%.aboveground biomass of grasses decreased by 36.55%,while those of sedges and weeds increased by 8.09%and 15.24%,*** increase

关键词： climate warming long-term warming species diversity indices aboveground biomass soil microclimate correlation analysis alpine meadows

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

Root-fed Salicylic Acid in Grape Involves the Response Caused by aboveground High Temperature

引用

Journal of Integrative Plant Biology 2008年第6期50卷 761-767页

作者： Hong-Tao Liu Yue-Ping Liu Wei-Dong Huang College of Food Science &Nutntional Engineenng China Agncultural University Beijing 100083 China Department of Biotechnology Beijing Agricultural College Beijing 102206 China

In order to investigate the transportation and distribution of salicylic acid （SA） from root to aboveground tissues in response to high temperature, the roots of grape plant were fed with 14C-SA before high temperature treatment. Radioactivity results showed that progressive increase in SA transportation from root to aboveground as compared with the control varied exactly with the heat treatment time. Radioactivity results of leaves at different stem heights indicated that the increase in SA amount at the top and middle leaves during the early period was most significant in comparison with the bottom leaves. The up-transportation of SA from root to aboveground tissues was dependent on xylem rather than phloem. Autoradiographs of whole grape plants strongly approved the conclusions drawn above. Root-derived SA was believed to be a fundamental source in response to aboveground high temperature.

关键词： aboveground grape high temperature root salicylic acid

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

Estimating aboveground biomass using Pléiades satellite image in a karst watershed of Guizhou Province,Southwestern China

引用

Journal of Mountain Science 2018年第5期15卷 1020-1034页

作者： GUO Yin-ming NI Jian LIU Li-bin WU Yang-yang GUO Chun-zi XU Xin ZHONG Qiao-lian State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China Puding Karst Ecosystem Research Station Chinese Academy of Sciences Puding 562100 China University of Chinese Academy of Sciences Beijing 100049 China College of Chemistry and Life Sciences Zhejiang Normal University Jinhua 321004 China

Biomass in karst terrain has rarely been measured because the steep mountainous limestone terrain has limited the ability to sample woody *** observation, especially at high spatial resolution, is an important surrogate for the quantification of the biomass of karst forests and shrublands. In this study, an artificial neural network(ANN) model was built using Pléiades satellite imagery and field biomass measurements to estimate the aboveground biomass(AGB) in the Houzhai River Watershed, which is a typical plateau karst basin in Central Guizhou Province, Southwestern China. A back-propagation ANN model was also *** vegetation indices, two spectral bands of Pléiades imagery, one geomorphological parameter,and land use/land cover were selected as model inputs. AGB was chosen as an output. The AGB estimated by the allometric functions in 78 quadrats was utilized as training data(54 quadrats, 70%),validation data(12 quadrats, 15%), and testing data(12 quadrats, 15%). Data-model comparison showed that the ANN model performed well with an absolute root mean square error of 11.85 t/ha, which was 9.88%of the average AGB. Based on the newly developed ANN model, an AGB map of the Houzhai River Watershed was produced. The average predicted AGB of the secondary evergreen and deciduous broadleaved mixed forest, which is the dominant forest type in the watershed, was 120.57 t/ha. The average AGBs of the large distributed shrubland,tussock, and farmland were 38.27, 9.76, and 11.69 t/ha, respectively. The spatial distribution pattern ofthe AGB estimated by the new ANN model in the karst basin was consistent with that of the field investigation. The model can be used to estimate the regional AGB of karst landscapes that are distributed widely over the Yun-Gui Plateau.

关键词： aboveground biomass Secondary karstforest Artificial neural network Vegetation indices Very high resolution satellite image

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

Species-specific allometric equations for improving aboveground biomass estimates of dry deciduous woodland ecosystems

引用

Journal of Forestry Research 2019年第5期30卷 1619-1632页

作者： Amsalu Abich Tadesse Mucheye Mequanent Tebikew Yohanns Gebremariam Asmamaw Alemu Department of General Forestry College of Agriculture and Rural TransformationUniversity of Gondar Department of Natural Resource Management College of Agriculture and Rural TransformationUniversity of Gondar

Allometric equations are important for quantifying biomass and carbon storage in terrestrial forest ***,equations for dry deciduous woodland ecosystems,an important carbon sink in the lowland areas of Ethiopia have not as yet been *** study attempts to develop and evaluate species-specific allometric equations for predicting aboveground biomass(AGB)of dominant woody species based on data from destructive sampling for Combretum collinum,Combretum molle,Combretum harotomannianum,Terminalia laxiflora and *** at breast height ranged from 5 to 30 *** empirical equations were developed using DBH(Eq.1)and height(Eq.2).Equation 2 gave better AGB estimations than *** inclusion of both DBH and H were the best estimate biometric variables for ***,the equations were evaluated and compared with common generic allometric *** result showed that our allometric equations are appropriate for estimating *** development and application of empirical species-specific allometric equations is crucial to improve biomass and carbon stock estimation for dry woodland ecosystems.

关键词： Woodland Allometric equations aboveground biomass Destructive sampling

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

A two-scale approach for estimating forest aboveground biomass with optical remote sensing images in a subtropical forest of Nepal

引用

Journal of Forestry Research 2019年第6期30卷 2119-2136页

作者： Upama A.Koju Jiahua Zhang Shashish Maharjan Sha Zhang Yun Bai Dinesh B.I.P.Vijayakumar Fengmei Yao Key Laboratory of Digital Earth Sciences Institute of Remote Sensing and Digital EarthCASBeijing 100094People’s Republic of China University of Chinese Academy of Sciences Beijing 100094People’s Republic of China International Maize and Wheat Improvement Center Kathmandu 44600Nepal The Laboratory of Forest Inventory The National Institute of Geographic and Forest InformationNancyFrance

Forests account for 80%of the total carbon exchange between the atmosphere and terrestrial ***,to better manage our responses to global warming,it is important to monitor and assess forest aboveground carbon and forest aboveground biomass(FAGB).Different levels of detail are needed to estimate FAGB at local,regional and national ***-scale remote sensing analysis from high,medium and coarse spatial resolution data,along with field sampling,is one approach often ***,the methods developed are still time consuming,expensive,and inconvenient for systematic monitoring,especially for developing countries,as they require vast numbers of field samples for ***,we recommend a convenient two-scale approach to estimate FAGB that was tested in our study *** study was conducted in the Chitwan district of Nepal using GeoEye-1(0.5 m),Landsat(30 m)and Google Earth very high resolution(GEVHR)Quickbird(0.65 m)*** the local scale(Kayerkhola watershed),tree crowns of the area were delineated by the object-based image analysis technique on GeoEye *** overall accuracy of 83%was obtained in the delineation of tree canopy cover(TCC)per plot.A TCC *** model was developed based on the TCC estimations from GeoEye and FAGB measurements from field sample plots.A coefficient of determination(R2)of 0.76 was obtained in the modelling,and a value of 0.83 was obtained in the validation of the *** upscale FAGB to the entire district,open source GEVHR images were used as virtual field *** delineated their TCC values and then calculated FAGB based on a TCC versus FAGB *** the multivariate adaptive regression splines machine learning algorithm,we developed a model from the relationship between the FAGB of GEVHR virtual plots with predictor parameters from Landsat 8 bands and vegetation *** model was then used to extrapolate FAGB to the entire *** approach considerably reduced the need for field data and com

关键词： Forest aboveground biomass Google Earth imagery Multi-scale remote sensing Virtual plot Optical imagery

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

Effects of spring fire and slope on the aboveground biomass, and organic C and N dynamics in a semi-arid grassland of northern China

引用

Journal of Arid Land 2019年第2期11卷 267-279页

作者： ZHAO Xiang HU Shuya DONG Jie REN Min ZHANG Xiaolin DONG Kuanhu WANG Changhui College of Animal Science and Veterinary Medicine Shanxi Agricultural University State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing Institute of Science and Technology Information

The aboveground primary production is a major source of carbon(C) and nitrogen(N) pool and plays an important role in regulating the response of ecosystem and nutrient cycling to natural and anthropogenic disturbances. To explore the mechanisms underlying the effect of spring fire and topography on the aboveground biomass(AGB) and the soil C and N pool, we conducted a field experiment between April 2014 and August 2016 in a semi-arid grassland of northern China to examine the effects of slope and spring fire, and their potential interactions on the AGB and organic C and total N contents in different plant functional groups(C_3 grasses, C_4 grasses, forbs, Artemisia frigida plants, total grasses and total plants).The dynamics of AGB and the contents of organic C and N in the plants were examined in the burned and unburned plots on different slope positions(upper and lower). There were differences in the total AGB of all plants between the two slope positions. The AGB of grasses was higher on the lower slope than on the upper slope in July. On the lower slope, spring fire marginally or significantly increased the AGB of C_3 grasses, forbs, total grasses and total plants in June and August, but decreased the AGB of C_4 grasses and *** plants from June to August. On the upper slope, however, spring fire significantly increased the AGB of forbs in June, the AGB of C_3 grasses and total grasses in July, and the AGB of forbs and C_4 grasses in August. Spring fire exhibited no significant effect on the total AGB of all plants on the lower and upper slopes in 2014 and 2015. In 2016, the total AGB in the burned plots showed a decreasing trend after fire burning compared with the unburned plots. The different plant functional groups had different responses to slope positions in terms of organic C and N contents in the plants. The lower and upper slopes differed with respect to the organic C and N contents of C_3 grasses, C_4 grasses, total grasses, forbs, A. frigida plan

关键词： aboveground biomass plant functional group spring fire slope position N content organic C content semi-arid grassland

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 Biomass Estimation of <i>Avicennia marina</i>(Forssk) Vierh. and <i>Rhizophora mucronata</i>Lam. in the Mangoky Delta, SW Madagascar

引用

American Journal of Plant Sciences 2018年第9期9卷 1894-1910页

作者： Andriamparany Rakotomavo Higher Institute of Sciences Environment and Sustainable Development (ISSEDD) University of Toamasina Toamasin Madagascar

Forty-three trees (23 Rhizophora mucronata and 20 Avicennia marina) were studied for the establishment of allometric relationships between the aboveground biomass “y” and the following dendrometric variables “x”: diameter at breast height DBH, (DBH)2 product Ht (where Ht is the total height), and the basal circumference Cb of the trees. The Log y = A Log [(DBH)2·Ht] + B equation gives a fairly satisfactory regression coefficient (R2 > 0.9) for the woody compartments. For A. marina, it is the equation Log y = A Log Cb + B that is the best correlated for the estimation of less woody compartments (R2 = 0.826 to 0.847). As for R. mucronata, these are much more related to DBH. For trees of 8 - 10 m height, the aboveground biomass of the delta is higher (171 t·ha-1 for R. mucronata) than that of Puerto Rico, but quite comparable to that of Australia (110 t·ha-1 for A. marina). The first tools for estimating aboveground biomass are given for these two characteristic species of the Indo-Pacific Region and East Africa. Because of the low values of the regression coefficients for some allometric relationships obtained, precautions should be taken in case of extrapolation.

关键词： Avicennia marina aboveground Biomass Mangoky Delta Mangrove Allometric Relationships Rhizophora mucronata

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

Retraction Note:Tree species diversity predicts aboveground carbon storage through functional diversity and functional dominance in the dry evergreen Afromontane forest of Hararghe highland,Southeast Ethiopia

引用

Ecological Processes 2023年第1期12卷 588-588页

作者： Mengistu Teshome Wondimu Zebene Asfaw Nigussie Muktar Mohammed Yusuf Wondo Genet College of Forestry and Natural Resources Hawassa UniversityHawassaEthiopia College of Natural Resources and Environmental Science Oda Bultum UniversityChiroEthiopia

The Editor-in-Chief has retracted this article as it contains material that substantially overlaps with the following article(Mensah et al.2016).Mengistu Teshome Wondimu does not agree to this *** Asfaw Nigussie and M... 详细信息

关键词： forest evergreen aboveground

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

Estimation of aboveground biomass using in situ hyperspectral measurements in five major grassland ecosystems on the Tibetan Plateau

引用

Journal of Plant Ecology 2009年第1期2卷 42-42页

作者： Miaogen Shen Yanhong Tang Julia Klein Pengcheng Zhang Song Gu Ayako Shimono Jin Chen 不详

In the the original published figure,the‘Achnatherum grassland’chart showed six lines when there should have been *** see below the corrected figure.

关键词： grassland Plateau aboveground

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

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：