Estimating Frost during Growing Season and Its Impact on the Velocity of Vegetation Greenup and Withering in Northeast China

被引:25
作者
Deng, Guorong [1 ,2 ]
Zhang, Hongyan [1 ,2 ]
Yang, Lingbin [1 ,2 ]
Zhao, Jianjun [1 ,2 ]
Guo, Xiaoyi [1 ,2 ]
Hong Ying [1 ,2 ]
Wu Rihan [1 ,2 ]
Dan Guo [3 ]
机构
[1] Northeast Normal Univ, Sch Geog Sci, Key Lab Geog Proc & Ecol Secur Changbai Mt, Minist Educ, Changchun 130024, Peoples R China
[2] Northeast Normal Univ, Urban Remote Sensing Applicat Innovat Ctr, Sch Geog Sci, Changchun 130024, Peoples R China
[3] Jilin Agr Univ, Coll Resources & Environm, Changchun 130024, Peoples R China
基金
中国国家自然科学基金;
关键词
climate change; greenup; withering; frost; Northeast China; LAND-SURFACE PHENOLOGY; CLIMATE-CHANGE; WINTER-WHEAT; SPRING FROST; HIGH-LATITUDES; TEMPERATE; DAMAGE; GROWTH; TRENDS; RISK;
D O I
10.3390/rs12091355
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Vegetation phenology and photosynthetic primary production have changed simultaneously over the past three decades, thus impacting the velocity of vegetation greenup (Vgreenup) and withering (Vwithering). Although climate warming reduces the frequency of frost events, vegetation is exposed more frequently to frost due to the extension of the growing season. Currently, little is known about the effect of frost during the growing season on Vgreenup and Vwithering. This study analyzed spatiotemporal variations in Vgreenup and Vwithering in Northeast China between 1982 to 2015 using Global Inventory Modeling and Mapping Studies Normalized Difference Vegetation Index (GIMMS 3g NDVI) data. Frost days and frost intensity were selected as indicators to investigate the influence of frost during the growing season on Vgreenup and Vwithering, respectively. Increased frost days during the growing season slowed Vgreenup and Vwithering. The number of frost days had a greater impact on Vwithering compared to Vgreenup. In addition, Vgreenup and Vwithering of forests were more vulnerable to frost days, while frost days had a lesser effect on grasslands. In contrast to frost days, frost intensity, which generally decreased during the growing season, accelerated Vgreenup and Vwithering for all land cover types. Changes in frost intensity had less of an impact on forests, whereas the leaf structure of grasslands is relatively simple and thus more vulnerable to frost intensity. The effects of frost during the growing season on Vgreenup and Vwithering in Northeast China were highlighted in this study, and the results provide a useful reference for understanding local vegetation responses to global climate change.
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页数:17
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