植被NPP时空格局与气象因子的关系分析  

Relationship Analysis of Vegetation NPP Spatio-temporal Distribution and Meteorological Factors

作　　者：周婧[1] 何政伟[1] 张志[1] 陈林 ZHOU Jing

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]成都理工大学旅游与城乡规划学院,四川成都610059

出　　处：《地理空间信息》2018年第11期25-28,31,124,共6页Geospatial Information

基　　金：国土资源部地学空间信息技术重点实验室开放基金资助项目(KLGSIT2013-06)

摘　　要：基于MODIS数据和气象数据,利用CASA模型估算了川西北江河源区2006~2009年植被NPP,并从时间、空间两个角度对比分析了研究区NPP的变化情况。结合研究区月均温度、月均降水量,分析NPP对气候变化的响应情况发现:(1) NPP在空间上由东向西递减,在297.56~314.56 gCm^(-2)a^(-1)之间变化,在时间上呈正态分布,但研究区由西向东存在峰值后移现象;(2)研究区NPP呈明显的季节差异,由于气候变暖、物候期延长,春、秋季呈积累量上升趋势;(3)在高程、坡度、坡向中,高程是导致研究区NPP空间分布和NPP峰值出现时间差异的主要影响因子;(4)研究区NPP增加区域主要集中于地形起伏度较高的西部高原山区,减少区域主要位于易受人类活动影响的中部区域;(5)气象因子对NPP的影响可能有滞后性,所以8月NPP与7月降水量的回归方程的R2高于8月;(6)气温和降水量对NPP均有显著影响,但降水量与NPP的相关性较高,是研究区NPP变化的主要驱动因子。Based on the MODIS data and meteorological data,we used CASA model to extract the vegetation NPP of the five cities in river source area of northwest Sichuan at first.And then,we analyzed the NPP variation situation from the angels of time and space in the area.Besides,combining with the average monthly temperature and precipitation,we simulated the relationship between NPP and climate factors.The results show that①the NPP presents a trend of decreasing from east to west,range from 297.56 to 314.56 gCm-2a-1.The average NPP normally distributed,accumulation peaked in July in the east and August in the west.②The NPP shows obvious difference in seasons.For the warmingextended,the accumulation of spring and fall are increasing.③Elevation is one of the most important factors which leads to the different of space distribution and peaking time.④The NPP increase area are mainly located in the west,and the decrease area are mainly located in the east.⑤The change of average monthly NPP is mainly own to the meteorological factors of the month ago.⑥Precipitation and temperature both have significant impact on NPP,but precipitation is the most relevant factor and main driving force for the change of NPP.

关 键 词：CASA模型 NPP 时空格局 气象因子 

分 类 号：P237[天文地球—摄影测量与遥感]