西双版纳近40年气候变化对自然植被净第一性生产力的影响

IMPACT OF CLIMATIC VARIATION ON NET PRIMARY PRODUCTIVITY OF NATURAL VEGETATION IN XISHUANGBANNA IN RECENT 40 YEARS

从西双版纳地区近 4 0年自然植被净第一性生产力 (NPP)的时空变化 ,讨论了“暖湿型”、“暖干型”气候变化对植被NPP的影响。结果表明 ,西双版纳地区近 4 0年NPP平均为 1 7.589t/hm2 ·a-1,呈略为下降的趋势 ;当年均温升高 2℃、降水量增多 2 0 %时 ,NPP呈升高趋势 ;当年均温升高 2℃、降水量减少 2 0 %时 ,全区大部分地区NPP呈降低趋势 。

In this paper,climatic data from 1955 to 1995 in 10 stations over Xishuangbanna are used in a new primary productivity( NPP ) model of natural vegetation,with a view to the ecophysiological feature and regional evapotranspiration model relating the water balance equation and heat balance equation,to estimate the temporal and spatial change of NPP in recent 40 years in this area.And the effects of “warm_wet” and “warm_dry”clomatic change on NPP are discussed.The results showed that the NPP value is meanly 17.589t/ht·a -1 under the recent 40 years,and has a little drop tendency.When the annual mean temperaure increases 2 ℃ and the annual precipitation increases 20 %, NPP may increase in whole district.When the annual mean temperature increases 2 ℃ and the annual precipitation dicreases 20 %, NPP may dicrease in major districts,while increase in minor districts.