摘要
基于气候生产力模型,利用1960～2000年127个气象站气温、降水资料以及植被信息,对云南省自然植被净初级生产力的时空分布特征进行了分析。结果表明:41a云南自然植被年均NPP为4.23×108tDM/a,约占全国自然植被年均NPP总量的11.4%;单位面积的平均NPP为10.64tDM/(hm2·a),是全国平均水平的2.8倍。云南自然植被NPP随着纬度、经度和海拔高度的增加均呈现下降趋势,变化总趋势为北部<中部<南部,东部<中部<西部。云南自然植被NPP在干季(11～4月)和雨季(5～10月)差异显著,6～8月最大;41a来云南大部分地区自然植被NPP呈现上升趋势,20世纪70、80年代比60年代有所下降,90年代有所上升。气温增加,降水增加或不变的情况下,滇西北和滇东北NPP增加幅度大于其他地区,说明这些地区气温是制约自然植被NPP的主要因素;气温增加,降水减少的情况下,几个少雨区和多雨区NPP降低幅度大于其他地区,表明在上述地区限制NPP的主要因素是水分。
Climatic data from 1960 to 2000 in 127 stations over Yunnan province are used in a net primary productivity （NPP） model of natural vegetation, with a view to the ecophysiological feature and regional evaportranspiration model relating the water balance equation and heat balance equation, to estimate the spatial distribution and temporal change of NPP in recent 41 years in this area. The changing pattern of NPP in Yunnan province was also given under doubled CO2concentration. The main results follow below ： during the past 41 years, the total annual NPP of vegetation in Yunnan is 4.23 10^8 t DM/a, accounting for 11.4% of the total country NPP. The average NPP is 10.64 t DM/（hm^2 · a）, as much as 2.8 times the total country mean. The difference of spatial pattern of NPP arises from differences in habitat and the ability of vegetation to adapt to different environments, and the NPP of vegetation in Yunnan decreases with increased latitude, longitude and elevation. Average NPP is higher in the rainy season than in dry season. The NPP value meanly has a little increase tendency under the recent 41 years. When the annual average temperature increases and the annual precipitation increases or stays unchanged, NPP in northeast and northwest may increase much than in other region. When the annual average temperature increases and the annual precipitation decreases, NPP in several rain-belt and rainless-belt may decrease acutely.
出处
《山地学报》
CSCD
北大核心
2006年第2期193-201,共9页
Mountain Research
基金
:国家重点基础研究发展计划(973项目)(2003CB415101)
云南省自然科学基金重点项目(2003C0002Z)资助~~
关键词
自然植被
净初级生产力(NPP)
时空分布
气候生产力模型
纵向岭谷区
natural vegetation
net primary productivity （NPP）
spatial-temporal pattern
Climatic NPP model
Longitudinal Range-Gorge Region
