利用大气植被相互作用模型AVIM2(Atmosphere-Vegetation Interaction Model 2)估算分析了时间长度为50年、空间分辨率为0.02°×0.02°的贵州净生态系统生产力(NEP)，分析了其对气候变化的响应。结果表明，(1) AVIM2模型能够模拟出贵州森林净初级生产力(NPP)的变化，模拟偏差随着树龄的增大而不断减小，其模拟效果优于综合模型。(2)1961-2010年，贵州NEP(以C计)平均值为23.9 g·m-2·a-1，碳源区面积比例仅为5%，且植被覆盖类型为南部部分常绿阔叶林。NEP总量的变动范围为-7.0~11.5 Tg ·a-1，平均每年吸收碳4.87Tg，碳汇量占中国区域的3~7%。(3)贵州境内31%的区域固碳能力下降明显(P<0.05)且主要集中在植被类型为常绿针叶林及农作物的北部地区，还有7%的区域固碳能力升高明显(P<0.05)且位于南部部分常绿阔叶林地区。(4)贵州NEP与气温显著负相关(P<0.01)，与降水量显著正相关(P<0.05)，气温对NEP的影响大于降水。
Temporal-spatial distribution of net ecosystem productivity in Guizhou during the recent 50 years
In this paper, AVIM2 (Atmosphere-Vegetation Interaction Model 2) was used to estimate the net ecosystem productivity (NEP) of Guizhou from 1961 to 2010 at a spatial resolution of 0.02°×0.02°. The results showed: (1) AVIM2 could reproduce the value of net primary productivity (NPP) which simulation bias declined with the increase of forest age and it was better than integrated model under the same simulation environment;(2) The mean value of NEP (represented as C) was 23.9 g·m-2·a-1, and the carbon source area only account for 5%areas of Guizhou where covered by evergreen broadleaved tree. Annual total NEP, at the same time, ranged from-7.0 to 11.5 Tg·a-1 with the mean value of 4.87 Tg·a-1 which accounted for 3%-7%carbon sink in China;(3) Carbon sequestration capacity in 31% area, covered by crops and evergreen needle-leaved tree in north, performed a significantly decreasing trend. While, only in 7%area, covered by evergreen broadleaved tree in part of south, presented significantly increasing trend;(4)Temperature played a more important role than precipitation in influencing the NEP which was significantly correlated with temperature negatively (P<0.01) and precipitation positively (P<0.05).
net ecosystem productivity (NEP)AVIM2Guizhou provinceclimate change
国家科技期刊平台
NSTL
万方数据
维普
