基于 CASA 模型的陕西省 NPP 遥感估算

摘要

Taking Shaanxi Province as our research object , by using remote sensing and GIS technology combined with MODIS/NDVI data, meteorological data and vegetation data , this study used CASA model to estimate NPP data of Shaanxi Province in 2013.The results showed that, the total NPP of Shaanxi Province in 2013 was 8.87 × 107 gC/a, the average value was 469.58 gC/(m2・ a), the highest NPP value was 723.06 gC/(m2・ a).The characteristics of space distribution showed significant latitudinal distribution , from south to north it showed a de-creasing tendency , Shannan >Guanzhong >Shanbei;Analysis of NPP time series showed that the characteristics of time distribution showed obvious seasonal variation , presenting a single peak curve; NPP of vegetation type showed with broadleaved forest >needleleaved forest >farmland >grassland , and each vegetation type ’ s maxi-mum value appeared in inconsistent month .%以陕西省为研究对象，运用遥感和GIS手段，结合MODIS／NDVI数据、气象数据以及植被类型数据，应用CASA模型估算得到陕西省2013年的NPP数据。结果表明，2013年陕西省NPP总量为8．87×107 gC／a，平均值为469．58 gC／（m2・ a）， NPP最高值为723．06 gC／（m2・ a），其空间分布特点表现为显著的纬度分布，南高北低，陕南＞关中＞陕北； NPP时间分布表现为明显的季节变化，呈单峰型曲线；植被类型NPP表现为阔叶林＞针叶林＞耕地＞草地，并且各植被类型最大值出现月份不一致。