1981-2008年中国陆地植被NPP对气候变化响应的敏感性试验

在验证CENTURY模型对中国陆地植被净初级生产力(Net Primary Productivity,NPP)模拟能力的基础上,利用该模型探讨了1981-2008年中国陆地植被NPP的年际变异和变化趋势对CO₂浓度、温度和降水变化的响应。结果表明,中国陆地植被NPP对不同气候因子的响应程度存在明显不同。其中,CO₂浓度变化对植被NPP年际变异的影响不显著,但能够引起中国大部分地区植被NPP趋势系数增大;温度对中国中高纬度地区植被NPP的年际变化影响显著,但就全国范围而言,植被NPP年际变异对温度变化的响应程度总体低于对降水变化的响应程度;降水变化是对中国植被NPP变化趋势起主导作用的气候因子。此外,综合考虑温度和降水变化的影响发现,植被NPP变化趋势的响应特征类似于降水单独变化时植被NPP变化趋势的响应特征。

Sensitivity experiments on response of terrestrial net primary productivity in China to climate change during 1981-2008

The capability of CENTURY model in simultating the vegetation Net Primary Productivity(NPP) in China was evaluated,and the response of vegetation NPP in China to variations of CO₂ concentration,temperature and precipitation from 1981 to 2008 was investigated.Results show that NPP in China exhibts various responses to different climatic factors.The variation of CO₂ concentration has no evident effect on the annual coefficient of NPP variation,but can increases the annual trend coefficient of NPP in most areas of China.Temperature can significantly affect the annual coefficient of NPP variation in high-mid latitudes of China,but,for the whole country,the impact of temperature change is less significant than that of precipitation change.The main controlling climatic factor impacting the trend of NPP is precipitation.In addition,it is found that the distribution of response of NPP trend to combination of temperature and precipitation seems to be similar to that caused by precipitation variation alone.