Variations in satellite-derived phenology in China's temperate vegetation
Variations in satellite-derived phenology in China's temperate vegetation
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DOI：
10.1111/j.1365-2486.2006.01123.x
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发表时间：
2006-04-01
影响因子：
11.6
通讯作者：
Zhu, B
中科院分区：
文献类型：
--
作者：
Piao, SL;Fang, JY;Zhu, B
植被物候与气候的关系是全球变化研究中的一个重要课题，因为它反映了陆地生态系统对气候变化的动态响应。利用1982年1月至1999年12月的超高分辨率辐射计/归一化植被指数双周时间序列和同期平均气温和降水资料，研究了近期气候变化对中国温带植被生长季持续时间的可能影响。结果表明，在研究期间，中国温带地区的生长期延长了1.16d(-1)。春季植被返青提前0.79天(-1)，秋季休眠推迟0.37天(-1)。物候事件的发生日期与前2-3个月的平均气温关系最为显著。初春(3月至5月初)气温升高1摄氏度，可能会提前7.5天开始复苏，而秋季(8月中旬至10月初)平均气温的上升可能会导致植被休眠推迟3.8天。降水量的变化也影响生长季的持续时间，但这种影响因植被类型和物候阶段而异。
The relationship between vegetation phenology and climate is a crucial topic in global change research because it indicates dynamic responses of terrestrial ecosystems to climate changes. In this study, we investigate the possible impact of recent climate changes on growing season duration in the temperate vegetation of China, using the advanced very high resolution radiometer (AVHRR)/normalized difference vegetation index (NDVI) biweekly time-series data collected from January 1982 to December 1999 and concurrent mean temperature and precipitation data. The results show that over the study period, the growing season duration has lengthened by 1.16 days yr(-1) in temperate region of China. The green-up of vegetation has advanced in spring by 0.79 days yr(-1) and the dormancy delayed in autumn by 0.37 days yr(-1). The dates of onset for phenological events are most significantly related with the mean temperature during the preceding 2-3 months. A warming in the early spring (March to early May) by 1 degrees C could cause an earlier onset of green-up of 7.5 days, whereas the same increase of mean temperature during autumn (mid-August through early October) could lead to a delay of 3.8 days in vegetation dormancy. Variations in precipitation also influenced the duration of growing season, but such influence differed among vegetation types and phenological phases.