中国不同植被类型净初级生产力变化特征

收集、统计了1993—2011年所发表的98篇涉及我国不同植被NPP数据(模型模拟估算值和实测值)的代表性论文.分析了我国不同植被类型NPP研究结果及其变化和空间分布特征.结果表明:1)模型模拟和实测NPP值都较高的植被类型有热带雨林、季雨林,常绿阔叶林,常绿针叶林、混交林和落叶阔叶林;2)模型模拟的植被NPP值空间分布规律基本表现为从东南沿海地区依次向西北内陆递减;3)在模型模拟与实测NPP值所共有的9种植被类型中,除耕地、灌丛和草地的模型模拟NPP值略大于实测值,其余6种植被类型均小于实测值;4)不同模型对同一种植被类型的模拟结果之间表现出了极大的差异;5)模型模拟平均值与实测值之间的差异相对较小,采用已提出的模型模拟平均值来估算我国不同植被的NPP是基本可行的.

The Change Characteristics of Net Primary Production in Different Vegetation Types in China

The NPP values in different vegetation types and their spatial distributions in China are studied through statistical analysis of vegetation NPP data(model simulation estimates as well as actual measures) collected from ninety eight representative research papers published between 1993 and 2011.The results show that(1) the vegetation types with higher NPP values,both simulated and actual,include tropical rain forests,monsoon forests,evergreen broadleaf forests,evergreen coniferous forests,and mixed and deciduous broad-leaved forests;(2) the spatial distribution of simulated vegetation NPP exhibits a pattern of gradual reduction going from Southeast coastal areas to the inland Northwest;(3) of the nine vegetation types in which both simulated and actual NPP values are available,the simulated values are slightly larger than the actual values in farmland,scrub,and grassland,but smaller in the other six types;(4) simulation of NPP in the same vegetation type using different models resulted in considerably different values;and(5) the difference between the average simulated NPP and the actual NPP is relatively smaller.It is thus proposed that the average simulated NPP can be used to estimate the NPP in different vegetation types in China.