中国植被生长的最适温度估算与分析

利用中国区域的GIMMS NDVI数据集和相应时期气象站点实测的温度数据集,分别在时间尺度和空间地域上对比分析植被生长过程与环境温度变化的关系,并由此提取区域植被生长关键阶段对应的温度,最后得到了中国各生态地理区植被生长的最适温度及其变化区间。结果显示:①研究首次给出了不同生态区植被生长的最适温度,其中青藏高原的参考最适温度最低,在10 ℃左右,而长江中下游和华南地区的较高,很多区域的值都超过了25 ℃,说明植被生长的最适温度具有很强的地域分异性;②根据论文结果,通过海拔高度和纬度两个地理因子,可快速拟合得到中国陆地植被生长的近似最适温度。研究结果可以为生态系统模型的参数本地化和空间化提供参考。

Estimating and Analyzing the Optimum Temperature for Vegetation Growth in China

The photosynthetic optimum temperature for vegetation growth means the ambient temperature is most conducive to plant growth.In this study,GIMMS NDVI data set and daily temperature data set measured by 752 meteorological stations in China from 1982 to 2006 were used to contrastively analyze the relationship between the NDVI and temperature change characteristics at both spatial and temporal scale.Based on the analysis,we extracted the corresponding temperatures in the process of vegetation growth phase.And finally the optimum temperature range and reference optimum temperatures of Chinese various terrestrial eco-geographical regions were obtained.The study firstly provides a scientific calculation framework and produces the reference optimum temperature of different regions.The relationship between terrestrial vegetation growth and the ambient temperature are close,and the optimum temperatures are distinct in different eco-geographical regions.Thereinto,the lowest temperatures appear in the Qinghai-Tibet Plateau eco-geographical regions,about 10 ℃.While the highest optimum temperatures appear in the middle and lower reaches of the Yangtze River and South China regions,their values are more than 25 ℃.Moreover,the reference optimum temperature can be availably estimated by two related factors,elevation and latitude.Our results can provide useful references for model parameterization.