干旱区生态环境知识资源中心(Arid): Spatiotemporal fusion of multi-source remote sensing data for estimating aboveground biomass of grassland

Arid

DOI	10.1016/j.ecolind.2023.109892
	Spatiotemporal fusion of multi-source remote sensing data for estimating aboveground biomass of grassland
	Zhou, Yajun; Liu, Tingxi; Batelaan, Okke; Duan, Limin; Wang, Yixuan; Li, Xia; Li, Mingyang
通讯作者	Liu, TX
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2023
卷号	146
英文摘要	Accurate estimation of aboveground biomass of grasslands is key to sustainable grassland utilization. However, most satellites cannot provide high temporal and spatial resolution data. Patterns of grassland dynamics asso-ciated with variability in climate conditions across spatiotemporal scales are yet to be adequately quantified. A spatiotemporal fusion model offers the opportunity to combine the resolution advantages of different remote sensing data to achieve a high frequency and high precision monitoring of vegetation. We test a flexible spatiotemporal data fusion (FSDAF) methodology to generate synthetic normalized difference vegetation index (NDVI) data from Moderate-Resolution Imaging Spectroradiometer (MODIS) and Landsat data sets. The meth-odology is tested for the semi-arid grassland of the Xilin River Basin, China. Based on NDVI data fusion and field measured aboveground biomass an aboveground biomass estimation model is established for the watershed. Exploring the temporal and spatial changes of biomass and its relationship with environmental factors. The results show that: (1) The FSDAF model performs well (R2 = 0.75) and has clear textural features. (2) The established Support Vector Machine Aboveground Biomass model not only ensured the accuracy of estimation (R2 = 0.78, RMSE = 15.43 g/m2), but also generated spatiotemporal maps of biomass with higher spatial (30 m) and temporal resolution (8 days). (3) The grassland aboveground biomass in this area decreases from southeast to northwest, and the grassland biomass reaches its peak at the end of July. The average biomass of different grasslands decreases in the order of meadow grassland > typical grassland > desert grassland. (4) Aboveground biomass increased linearly with increasing water content, organic carbon and total nitrogen, and was most sensitive to soil water content. During the early growing and rapid growing period, aboveground biomass is mainly affected by both air temperature and precipitation, while the effects of temperature and human activities gradually dominate in the middle and late growing periods. This study helps to improve the spatial and temporal resolution of dynamic monitoring of grassland biomass, and provides a scientific basis for grassland protection and management in arid and semi-arid regions.
英文关键词	Biomass Spatiotemporal data fusion Support Vector Machine Xilin River Basin
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000923534600001
WOS关键词	NATURAL GRASSLAND ; CLIMATE-CHANGE ; REFLECTANCE ; MODEL
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395911
推荐引用方式 GB/T 7714	Zhou, Yajun,Liu, Tingxi,Batelaan, Okke,et al. Spatiotemporal fusion of multi-source remote sensing data for estimating aboveground biomass of grassland[J],2023,146.
APA	Zhou, Yajun.,Liu, Tingxi.,Batelaan, Okke.,Duan, Limin.,Wang, Yixuan.,...&Li, Mingyang.(2023).Spatiotemporal fusion of multi-source remote sensing data for estimating aboveground biomass of grassland.ECOLOGICAL INDICATORS,146.
MLA	Zhou, Yajun,et al."Spatiotemporal fusion of multi-source remote sensing data for estimating aboveground biomass of grassland".ECOLOGICAL INDICATORS 146(2023).