globalchange  > 全球变化的国际研究计划
DOI: 10.1016/j.ecolind.2019.02.023
WOS记录号: WOS:000470964500047
论文题名:
Estimating grassland aboveground biomass on the Tibetan Plateau using a random forest algorithm
作者: Zeng, Na1,2; Ren, Xiaoli1; He, Honglin1,3; Zhang, Li1,3; Zhao, Dan4; Ge, Rong1,2; Li, Pan5; Niu, Zhongen1,2
通讯作者: Ren, Xiaoli ; He, Honglin
刊名: ECOLOGICAL INDICATORS
ISSN: 1470-160X
EISSN: 1872-7034
出版年: 2019
卷: 102, 页码:479-487
语种: 英语
英文关键词: Aboveground biomass (AGB) ; The Tibetan Plateau ; Random Forest (RF) ; Mean annual temperature (MAT) ; Mean annual precipitation (MAP)
WOS关键词: LIVESTOCK-CARRYING-CAPACITY ; PRECIPITATION GRADIENT ; CARBON STORAGE ; CLIMATE-CHANGE ; TIME-SERIES ; VEGETATION ; CHINA ; ECOSYSTEMS ; EVAPOTRANSPIRATION ; PRODUCTIVITY
WOS学科分类: Biodiversity Conservation ; Environmental Sciences
WOS研究方向: Biodiversity & Conservation ; Environmental Sciences & Ecology
英文摘要:

Effective and accurate monitoring of grassland aboveground biomass (AGB) is necessary for improving our understanding of regional carbon cycle and pastoral agricultural management. In this study, we developed a suitable AGB estimation model for the Tibetan alpine grasslands based on the random forest algorithm, using 256 AGB observation data, remote sensing vegetation indices, meteorological data, and topographical data. We estimated the grassland AGB on the Tibetan Plateau during 2000-2014, analyzed its spatiotemporal changes, and further explored the response of AGB to the variation in climatic factors. The results indicated that (1) the RF model performed well in the AGB estimation, which can explain 86% of the variation of the observation data. (2) The grassland AGB decreased from the southeast to the northwest in this region, with an average value of 77.12 gm(-2). (3) In the whole study area, the grassland AGB showed significantly positive correlation with temperature and precipitation. The correlation between grassland AGB and MAP was 0.54 (P < 0.05), much higher than that of MAT (R = 0.38, P < 0.05). (4) The inter-annual variation of AGB on the Tibetan Plateau was significantly and positively correlated with temperature (R-2 = 0.45, P < 0.05). This study demonstrated that RF model can help improve our understanding of the spatiotemporal dynamics of the grassland AGB and the effects of climate variation.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/142708
Appears in Collections:全球变化的国际研究计划

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作者单位: 1.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Chinese Acad Sci, Coll Resource & Environm, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Key Lab Digital Earth Sci, Inst Remote Sensing & Digital Earth, Beijing 100094, Peoples R China
5.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China

Recommended Citation:
Zeng, Na,Ren, Xiaoli,He, Honglin,et al. Estimating grassland aboveground biomass on the Tibetan Plateau using a random forest algorithm[J]. ECOLOGICAL INDICATORS,2019-01-01,102:479-487
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