基于NOAA/AVHRR数据的天津地区净初级生产力时空格局分析

本文基于CASA模型，充分考虑植被覆盖类型对光能利用率的影响及植被反照率对净辐射的影响，利用NOAA/AVHRR 1B卫星资料和气象资料估算了天津地区的植被净初级生产力（NPP）。估算结果表明：2007年天津地区植被NPP为3.86×109 gC/a，年平均NPP为335 gC/m2/a；蓟县、宁河与宝坻年NPP估算值居前三位；各季度对NPP总量贡献率依次为：夏季（62％），秋季（21％）、春季（16％），冬季（1％）；受物候和气候因素的综合影响，天津地区NPP具有明显的年际变化，利用年均NDVI可以较好地模拟天津地区NPP年总量，其模拟表达式为：

Research on Net Primary Production and Spatiotemporal Pattern based on NOAA/AVHRR data in Tianjin area

Based on CASA model,net primary production（NPP）of Tianjin area was estimated using NOAA/AVHRR 1B data and climate data.The influence of vegetation types on light utility efficiency and albedo on net radiance were considered.The NPP simulated result of Tianjin area showed that total of NPP of Tianjin in 2007 was 3.86×109 gC/a and average NPP was 335 gC/（m2·a）.The top three NPP area of Tianjin were Jixian,Ninghe and Baodi.And the contribution of NPP of Tianjin for summer in all year was 62%,and for autumn was 21%,and for spring was 16% and for winter was 1%,separately.For the influence of different phenology law and weather factors,NPP of Tianjin had distinct annual variation.And annual NPP could be simulated by annual average NDVI and the simulated equation was NPP=1684.8×NDVI1.1149.