以HJ-1卫星遥感数据估算高寒草地植被净第一性生产力的潜力评估——以若尔盖草地为例

基于HJ-1卫星数据、数字高程数据、气象数据和地面实测数据,利用改进后的CASA模型估算了2010年若尔盖草地的植被净第一性生产力（NPP）,以评价该卫星数据在高寒草地NPP估算中的应用潜力。结果表明：（1）利用改进后的CASA模型模拟草地生物量,通过与实测地上生物量比较,两者的相关程度较高,R2=0.8726。模拟精度达80%,因此可以作为估产模型实际应用；（2）利用改进后的CASA模型模拟草地NPP,模拟结果比其他研究结果略大,但更适合于若尔盖草地；（3）HJ-1卫星数据为高寒草地NPP的估算提供了高时间和高空间分辨率的数据源。

Evaluation on Net Primary Productivity of Alpine Meadow Based on HJ-1 Satellite Data: A case study in the Zoige Grassland

Based on HJ-1 satellite data, digital elevation model data, meteorological data and measured data in field, the net primary production (NPP) of the Zoige Grassland in 2010 was simulated by using the improved CASA model in order to assess the potential application of HJ-1 satellite data in NPP estimation in alpine grassland. The results showed that: (1) Comparison between the actual measured biomass and the grass biomass simulated by using the CASA model indicated that the correlation was higher, the simulation accuracy was more than 80%, and R2=0.8726. The CASA model could be used to estimate NPP in the Zoige Grassland. (2) Although the simulated NPP was greater than that acquired by the other researchers, the improved CASA model was more suitable in the Zoige Grassland. (3) HJ-1 satellites could offer the high time and high spatial resolution data sources for estimating NPP in alpine grassland.