干旱区生态环境知识资源中心(Arid): Impacts of climate change and human activities on different degraded grassland based on NDVI

Arid

DOI	10.1038/s41598-022-19943-6
	Impacts of climate change and human activities on different degraded grassland based on NDVI
	Hou, Qingqing; Ji, Zhenxia; Yang, Hang; Yu, Xiaojun
通讯作者	Yu, XJ
来源期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
出版年	2022
卷号	12 期号:1
英文摘要	Grassland degradation has emerged as a serious socio-economic and ecological problem, endangering both long-term usage and the regional biogeochemical cycle. Climate change and human activities are the two leading factors leading to grassland degradation. However, it is unclear what the degradation level caused by these two factors is. Using the normalized difference vegetation index (NDVI) and coefficient of variation of NDVI (CVNDVI), the spatial distribution features of grassland degradation or restoration were analyzed in Qilian County in the northeast of the Qinghai-Tibet Plateau. The dominant climate variables affecting NDVI variation were selected through the combination of random forest model and stepwise regression method to improve the residual trend analysis, and on this basis, twelve possible scenarios were established to evaluate the driving factors of different degraded grasslands. Finally, used the Hurst index to forecast the trend of grassland degradation or restoration. The results showed that approximately 55.0% of the grassland had been degraded between 2000 and 2019, and the area of slight degradation (NDVIslope > 0; CVNDVI (slope) > 0; NDVIvalue > 0.2) accounted for 48.6%. These regions were centered in the northwest of Qilian County. Climate and human activities had a joint impact on grassland restoration or degradation. Human activities played a leading role in grassland restoration, while climate change was primarily a driver of grassland degradation. The regions with slight degradation or re-growing (NDVIslope > 0; CVNDVI (slope) > 0), moderate degradation (NDVIslope < 0; CVNDVI (slope) > 0), and severe degradation or desertification (NDVIslope < 0; CVNDVI (slope) < 0) were dominated by the joint effects of climate and anthropogenic activity accounted for 34.3%, 3.3%, and 1.3%, respectively, of the total grassland area. Grasslands in most areas of Qilian County are forecasted to continue to degrade, including the previously degraded areas, with continuous degradation areas accounting for 54.78%. Accurately identifying the driving factors of different degraded grassland and predicting the dynamic change trend of grassland in the future is the key to understand the mechanism of grassland degradation and prevent grassland degradation. The findings offer a reference for accurately identifying the driving forces in grassland degradation, as well as providing a scientific basis for the policy-making of grassland ecological management.
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:001012301900039
WOS关键词	NET PRIMARY PRODUCTIVITY ; TIBETAN PLATEAU ; QUANTITATIVE ASSESSMENT ; VEGETATION VARIATION ; SEMIARID GRASSLANDS ; ALPINE GRASSLAND ; DRIVING FORCES ; DEGRADATION ; CHINA ; DYNAMICS
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394472
推荐引用方式 GB/T 7714	Hou, Qingqing,Ji, Zhenxia,Yang, Hang,et al. Impacts of climate change and human activities on different degraded grassland based on NDVI[J],2022,12(1).
APA	Hou, Qingqing,Ji, Zhenxia,Yang, Hang,&Yu, Xiaojun.(2022).Impacts of climate change and human activities on different degraded grassland based on NDVI.SCIENTIFIC REPORTS,12(1).
MLA	Hou, Qingqing,et al."Impacts of climate change and human activities on different degraded grassland based on NDVI".SCIENTIFIC REPORTS 12.1(2022).