Fu Yuan Yuan, Zhao Jian Jun, Zhang Hong Yan, He Hong Shi, Guo Xiao Yi
School of Geographical Sciences, Northeast Normal University, Changchun 130024, China.
Ying Yong Sheng Tai Xue Bao. 2016 Sep;27(9):2797-2806. doi: 10.13287/j.1001-9332.201609.003.
Vegetation phenology is a good indicator of climate change, because of the close correlation between vegetation and climate. The Daxing'an Mountains, located in Chinese northernmost region, are more sensitive to climate change. Researching the spatio-temporal variation of vegetation phenology in this region is of great significance for assessing the influence of global change on terrestrial ecosystem. According to the eco-geographical zoning of China, the Daxing'an Mountains can be divided into for four eco-geographical regions. In this study, the spatial distribution and dynamics of vegetation phenology in the Daxing'an Mountains were analyzed using 8-km resolution GIMMS NDVI 3g dataset from 1982 to 2012. Results showed that the start of growing season in all partitions exhibited an advancing trend, and the end of growing season in all partitions had an extending trend. Vegetation phenology which was sensitive to the change of meteorological factors had a stronger correlation with temperature than with precipitation for all four eco-geographical regions. There was a significant negative correlation between the start of growing season in the northern region and spring temperature. Except for the south of the Daxing'an Mountains, the ending days of growing season in the other three eco-geographical regions had significant negative correlations with summer precipitation. The change of vegetation phenology in the whole study was obvious along with altitude and latitude.
植被物候是气候变化的良好指标，因为植被与气候之间存在密切的相关性。位于中国最北部地区的大兴安岭对气候变化更为敏感。研究该地区植被物候的时空变化对于评估全球变化对陆地生态系统的影响具有重要意义。根据中国的生态地理分区，大兴安岭可分为四个生态地理区域。在本研究中，利用1982年至2012年分辨率为8公里的GIMMS NDVI 3g数据集，分析了大兴安岭植被物候的空间分布和动态变化。结果表明，所有分区的生长季开始均呈提前趋势，所有分区的生长季结束均呈延长趋势。对气象因子变化敏感的植被物候，在四个生态地理区域中与温度的相关性均强于与降水的相关性。北部地区生长季开始与春季温度呈显著负相关。除大兴安岭南端外，其他三个生态地理区域生长季结束天数与夏季降水呈显著负相关。整个研究中植被物候的变化随海拔和纬度变化明显。
