The spatial pattern of grassland aboveground biomass on Xizang Plateau and its climatic controls
Jiang, YB; Tao, J; Huang, YQ; Zhu, JT; Tian, L; Zhang, YJ
2015
Source PublicationJOURNAL OF PLANT ECOLOGY
ISSN1752-9921
Volume8Issue:1Pages:30-40
AbstractAims Grassland is the most widely distributed vegetation type on the Xizang Plateau. Accurate remote sensing estimation of the grassland aboveground biomass (AGB) in this region is influenced by the types of vegetation indexes (VIs) used, the grain size (resolution) of the remote sensing data and the targeted ecosystem features. This study attempts to answer the following questions: (i) Which VI can most accurately reflect the grassland AGB distribution on the Xizang Plateau? (ii) How does the grain size of remote sensing imagery affect AGB reflection? (iii) What is the spatial distribution pattern of the grassland AGB on the plateau and its relationship with the climate? Methods We investigated 90 sample sites and measured site-specific AGBs using the harvest method for three grassland types (alpine meadow, alpine steppe and desert steppe). For each sample site, four VIs, namely, Normalized Difference VI (NDVI), Enhanced VI, Normalized Difference Water Index (NDWI) and Modified Soil-Adjusted VI (MSAVI) were extracted from the Moderate Resolution Imaging Spectroradiometer (MODIS) products with grain sizes of 250 m and 1 km. Linear regression models were employed to identify the best estimator of the AGB for the entire grassland and the three individual grassland types. Paired Wilcoxon tests were applied to assess the grain size effect on the AGB estimation. General linear models were used to quantify the relationships between the spatial distribution of the grassland AGB and climatic factors. Important Findings The results showed that the best estimator for the entire grassland AGB on the Xizang Plateau was MSAVI at a 250 m grain size (MSAVI(250) (m)). For each individual grassland type, the best estimator was MSAVI at a grain size of 250 m for alpine meadow, NDWI at a grain size of 1 km for alpine steppe and NDVI at a grain size of 1 km for desert steppe. The explanation ability of each VI for the grassland AGB did not significantly differ for the two grain sizes. Based on the best fit model (AGB = -10.80 + 139.13 MSAVI(250 m)), the spatial pattern of the grassland AGB on the plateau was characterized. The AGB varied from 1 to 136 g m(-2). Approximately 59% of total spatial variation in the AGB for the entire grassland was explained by the combination of the mean annual precipitation (MAP) and mean annual temperature. The explanatory power of MAP was weaker for each individual grassland type than that for the entire grassland. This study illustrated the high efficiency of the VIs derived from MODIS data in the grassland AGB estimation on the Xizang Plateau due to the vegetation homogeneity within a 1 x 1 km pixel in this region. Furthermore, MAP is a primary driver on the spatial variation of AGB at a regional scale.
SubtypeJournal
Keywordaboveground biomass grassland vegetation index Xizang Plateau grain size precipitation
Subject AreaPlant Sciences ; Environmental Sciences & Ecology
WOS Subject ExtendedPlant Sciences ; Ecology
WOS KeywordADJUSTED VEGETATION INDEX ; SPECIES-RICHNESS PATTERNS ; NET PRIMARY PRODUCTIVITY ; REMOTE-SENSING APPROACH ; TEMPERATE GRASSLAND ; EPIPHYLLOUS LIVERWORTS ; PRECIPITATION GRADIENT ; HYPERSPECTRAL DATA ; TIBETAN PLATEAU ; INNER-MONGOLIA
Indexed BySCI
Language英语
WOS IDWOS:000350242200004
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44454
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Jiang, YB,Tao, J,Huang, YQ,et al. The spatial pattern of grassland aboveground biomass on Xizang Plateau and its climatic controls[J]. JOURNAL OF PLANT ECOLOGY,2015,8(1):30-40.
APA Jiang, YB,Tao, J,Huang, YQ,Zhu, JT,Tian, L,&Zhang, YJ.(2015).The spatial pattern of grassland aboveground biomass on Xizang Plateau and its climatic controls.JOURNAL OF PLANT ECOLOGY,8(1),30-40.
MLA Jiang, YB,et al."The spatial pattern of grassland aboveground biomass on Xizang Plateau and its climatic controls".JOURNAL OF PLANT ECOLOGY 8.1(2015):30-40.
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