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利用MODIS遥感数据等驱动生态过程模型,模拟分析了2000-2011年江西省森林总初级生产力(GPP)、净初级生产力(NPP)和净生态系统生产力(NEP)的时空变化特征及其对气象干旱的响应。结果表明,2000-2011年江西省受旱程度较之前的30 a有所加剧,2003,2004,2007,2009和2011等年份的干旱较为严重,其中,2003,2007和2011年遭受中度干旱以上地区分别占全省总面积的56.5%,73.3%和87.2%。2000-2011年间全省森林的平均年GPP的年际波动明显,略有下降;平均年NPP和NEP呈明显下降趋势(p=0.02,p=0.06)。森林生产力变化受干旱严重程度、干旱发生和持续时间等共同影响,轻度干旱不会导致森林生产力下降(2004年)、春旱(2011年)和夏旱(2003年)以及多季节干旱(2007年春旱和秋旱)则导致森林生产力降低。干旱对江西省森林生产力影响的时间效应较短,大部分地区的干旱会影响当月的NPP和NEP,仅在江西省东部和南部地区,干旱对森林NPP的滞后影响会达到3个月。
Using MODIS remote sensing data to drive the ecological process model, this paper simulated and analyzed the spatio-temporal variations of total primary productivity (GPP), net primary productivity (NPP) and net ecosystem productivity (NEP) in Jiangxi Province from 2000 to 2011, the response to. The results showed that the degree of drought in Jiangxi Province was aggravating from 2000 to 2011, and the drought in 2003, 2004, 2007, 2009 and 2011 was more severe. Among them, the drought suffered more than moderate drought in 2003, 2007 and 2011 Areas accounted for 56.5%, 73.3% and 87.2% of the total area of the province respectively. The annual mean annual GPP of forest in the province during 2000-2011 fluctuated slightly and slightly, while the average annual NPP and NEP showed a declining trend (p = 0.02, p = 0.06). Changes in forest productivity are affected by both the severity of drought and the occurrence and duration of droughts. Mild drought will not lead to a decline in forest productivity (2004), spring drought (2011) and summer drought (2003) and multi-season drought (2007 Spring droughts and autumn droughts lead to lower forest productivity. Drought has a short time effect on forest productivity in Jiangxi Province. Drought in most areas will affect NPP and NEP in the current month. In the eastern and southern parts of Jiangxi Province, drought will only affect the lag of forest NPP by 3 months.