【作者】 王静； 郭铌； 王振国； 李小媛；

【Author】 WANG Jing~1,GUO Ni~1,WANG Zhen-guo~2,LI Xiao-yuan~2 (1.Lanzhou Institute of Arid Meteorology,CMA,Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Key open laboratory of arid climate change and disaster reduction of CMA, Lanzhou 730020,China) (2.Gannan Meteorological Bureau,Hezuo 747000,China).

【机构】 中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室中国气象局干旱气候变化与减灾重点开放实验室； 甘南州气象局；

【摘要】 本文利用2007年和2008年16天合成的250m MODIS植被指数产品和地面调查资料,分析了甘南草地地上部生物量同光谱信息之间的相关关系,并基于这种相关关系建立了甘南草地地上部生物量遥感监测模型,继而估算了2007年和2008年甘南州及各县草地地上部生物量。结果表明:在牧草生长的主要时间里,草地地上部生物量同波段反射率和植被指数均存在极显著相关关系,尤其与地面调查同期(8月中下旬)的增强型植被指数EVI相关性最高,相关系数为0.782。利用EVI建立的三次多项式模型模拟结果明显优于其它植被指数,能较好的模拟草地地上部生物量。2007年甘南草地地上部生物量平均为5610kg/hm~2,2008年为5605kg/hm~2。与2007年相比,临潭、卓尼和迭部县地上部生物量略有增加,而合作、玛曲、碌曲、夏河和舟曲县则有所下降,以舟曲县下降最为明显。更多还原

【Abstract】 Using 16 days 250m MODIS vegetation index dataset,the relativity of four band reflectance and eight vegetation indexes with aboveground biomass in Gannan grassland were analyzed.And then based on this relativity,remote sensing monitoring models of aboveground biomass in Gannan grassland was constructed and aboveground biomass of Gannan and each county were estimated.The result showed that in most growth period,there are very significant relativity between band reflectance, vegetation index and aboveground biomass,but it is most obvious with synchronous EVI(r=0.782). And the cubic polynomial model using EVI fit aboveground biomass better than other vegetation index. Aboveground biomass in 2007 and 2008 is 5610kg/hm~2 and 5605kg/hm~2,respectively.Compared to that in 2007,aboveground biomass in Lintan,Zhuoni and Diebu county increased,while Hezuo,Maqu, Luqu,Xiahe and Zhouqu decreased in 2008.更多还原