干旱区生态环境知识资源中心(Arid): Precipitation and Minimum Temperature are Primary Climatic Controls of Alpine Grassland Autumn Phenology on the Qinghai-Tibet Plateau

Arid

DOI	10.3390/rs12030431
	Precipitation and Minimum Temperature are Primary Climatic Controls of Alpine Grassland Autumn Phenology on the Qinghai-Tibet Plateau
	An, Shuai 1; Chen, Xiaoqiu 2; Zhang, Xiaoyang 3,4; Lang, Weiguang 2; Ren, Shilong 5; Xu, Lin 6
通讯作者	Chen, Xiaoqiu
来源期刊	REMOTE SENSING
EISSN	2072-4292
出版年	2020
卷号	12 期号:3
英文摘要	Autumn phenology is a crucial indicator for identifying the alpine grassland growing season's end date on the Qinghai-Tibet Plateau (QTP), which intensely controls biogeochemical cycles in this ecosystem. Although autumn phenology is thought to be mainly influenced by the preseason temperature, precipitation, and insolation in alpine grasslands, the relative contributions of these climatic factors on the QTP remain uncertain. To quantify the impacts of climatic factors on autumn phenology, we built stepwise linear regression models for 91 meteorological stations on the QTP using in situ herb brown-off dates, remotely sensed autumn phenological metrics, and a multi-factor climate dataset during an optimum length period. The results show that autumn precipitation has the most extensive influence on interannual variation in alpine grassland autumn phenology. On average, a 10 mm increase in autumn precipitation during the optimum length period may lead to a delay of 0.2 to 4 days in the middle senescence date (P < 0.05) across the alpine grasslands. The daily minimum air temperature is the second most important controlling factor, namely, a 1 degrees C increase in the mean autumn minimum temperature during the optimum length period may induce a delay of 1.6 to 9.3 days in the middle senescence date (P < 0.05) across the alpine grasslands. Sunshine duration is the third extensive controlling factor. However, its influence is spatially limited. Moreover, the relative humidity and wind speed also have strong influences at a few stations. Further analysis indicates that the autumn phenology at stations with less autumn precipitation is more sensitive to precipitation variation than at stations with more autumn precipitation. This implies that autumn drought in arid regions would intensely accelerate the leaf senescence of alpine grasslands. This study suggests that precipitation should be considered for improving process-based autumn phenology models in QTP alpine grasslands.
英文关键词	land surface phenology MODIS data middle senescence date impacts of climatic factors precipitation sensitivity alpine grassland ecosystem
类型	Article
语种	英语
国家	Peoples R China ; USA
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000515393800090
WOS关键词	LAND-SURFACE PHENOLOGY ; VEGETATION PHENOLOGY ; LEAF SENESCENCE ; GROWING-SEASON ; TIME-SERIES ; GREEN-UP ; RESPONSES ; DYNAMICS ; CHINA ; DATE
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
来源机构	中国农业大学 ; 北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315415
作者单位	1.Beijing Union Univ, Coll Appl Arts & Sci, Beijing 100191, Peoples R China; 2.Peking Univ, Coll Urban & Environm Sci, Minist Educ, Lab Earth Surface Proc, Beijing 100871, Peoples R China; 3.South Dakota State Univ, GSCE, Brookings, SD 57007 USA; 4.South Dakota State Univ, Dept Geog & Geospatial Sci, Brookings, SD 57007 USA; 5.Shandong Univ, Environm Res Inst, Qingdao 266237, Peoples R China; 6.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China
推荐引用方式 GB/T 7714	An, Shuai,Chen, Xiaoqiu,Zhang, Xiaoyang,et al. Precipitation and Minimum Temperature are Primary Climatic Controls of Alpine Grassland Autumn Phenology on the Qinghai-Tibet Plateau[J]. 中国农业大学, 北京大学,2020,12(3).
APA	An, Shuai,Chen, Xiaoqiu,Zhang, Xiaoyang,Lang, Weiguang,Ren, Shilong,&Xu, Lin.(2020).Precipitation and Minimum Temperature are Primary Climatic Controls of Alpine Grassland Autumn Phenology on the Qinghai-Tibet Plateau.REMOTE SENSING,12(3).
MLA	An, Shuai,et al."Precipitation and Minimum Temperature are Primary Climatic Controls of Alpine Grassland Autumn Phenology on the Qinghai-Tibet Plateau".REMOTE SENSING 12.3(2020).