摘要
利用甘南地区2006-2007年的外业实测样方草地干物质产量和MODIS植被指数数据,建立了草地地上部分干物质产量遥感反演模型,根据根冠比和干物质转碳率对2006-2008年甘南地区草地净初级生产力(NPP,netprimary productivity)进行了估算,绘制了甘南草地NPP年累积量空间分布格局图和NPP月度变化动态图,对不同草地植被类型的NPP差异进行了评价。研究结果表明,2006-2008年甘南草地年NPP分别达637.04,599.98和566.59 g C/m2,其空间分布具有自西南向东北逐渐减少的趋势;年内不同草地类型的NPP均在7-8月达到最大累积量;NPP累积量最高的3种草地类型是沼泽、高寒灌丛草甸和高寒草甸,3年中最大月NPP的平均值分别达到1 137.28,553.76和527.66 g C/m2;2006-2008年甘南草地NPP持续下降,年草地NPP总量的减少速率为1.2Tg/a,尤其是沼泽湿地的NPP下降明显,年平均减少速率达到了125.92 g C/m2。
Dry matter yield information from field surveying quadrats and MODIS vegetation index data in Gan nan Prefecture during 2006--2007 were used to construct a remote sensing monitoring model for aboveground dry matter biomass of grassland. The net primary product （NPP） of grassland was estimated and used to, com plete the spatial distribution maps of annual NPP accumulation and monthly NPP dynamic changes, and to evaluate the NPP difference between various grassland vegetation types. The annual maximum NPP of grassland in Gannan Prefecture during 2006--2008 were 637.04, 599.98 and 566.59 g C/（m2·a）, respectively. The distribution of annual maximum NPP has a trend of gradual reduction from southwest to northeast and the yearly maximum NPP accumulation of all grassland types was in July and A highest NPP accumulation were marsh, alpine shrub meadow, and ugust. alpine The three grassland types with the meadow, with monthly maximum NPP values of 1 137. 28, 553. 76 and 527. 66 g C/m^2, respectively （mean values for the three years）. The grassland NPP in Gannan Prefecture was continuously decreasing over the three years, with an annual reduction forthe total grassland of 1.2 Tg/a. The reduction of marsh NPP is especially significant, with an annual rate of 125.92 g C/（m2 ·a）.
出处
《草业学报》
CSCD
北大核心
2010年第1期201-210,共10页
Acta Prataculturae Sinica
基金
国家高技术研究发展专项经费(2007AA10Z232)资助
关键词
甘南地区
MODIS植被指数
遥感监测模型
草地净初级生产力
Gannan Prefeeture； MODIS vegetation mary production index
remote sensing monitoring model； grassland net pri
