【作者】 那亚；

【导师】 蒙荣； 金花；

【作者基本信息】 内蒙古农业大学 ， 生态学， 2010， 硕士

【摘要】 本文利用遥感技术结合地面调查的方法对2008年克什克腾旗草地资源特征及其草地营养成分进行了研究。通过建立克什克腾旗草地资源分类系统,利用TM和MODIS遥感影像提取草地特征信息,划分出克什克腾旗草地资源类型,并建立草地地上生物量预测模型;利用NDVI指数进行草地退化分析;结合地面采样测定克什克腾旗草地营养成分,划分出草地营养类型。此数据可为以后的克什克腾旗草地资源动态监测奠定基础并为草地资源可持续利用及草地的保护管理提供理论依据。研究结果表明:1、克什克腾旗天然草地总面积为2063.60万亩,包括5个类,11个亚类,25个组,94个草地型,其中,温性草原类的分布面积最广。与1988年相比,监测结果中增加了温性草甸草原类中查出的沙地草甸草原亚类和低地草甸类中查出的低湿地草甸亚类。2、通过提取MODIS-NDVI指数建立了草地地上生物量反演模型:y=2493.46x-1098.91(R2=0.68,p<0.001)。3、通过提取MODIS-NDVI指数与草地植被盖度建立了相关性模型:y=187.93x-50.43(R2=0.72,p<0.001),采用草地植被盖度和NDVI作为判别草地退化的依据。退化分析结果表明克什克腾旗草地的区域性差异较大,近二十年以来退化趋势明显,且从东到西退化加剧,符合草地退化监测的精度要求。4、分析得出克什克腾旗主要草地型的单位面积粗蛋白供给量中地榆(Sanguisorba officinalis)、日荫菅(Carex pediformis)、大针茅(Stipa grandis)草地型最高,同时确定克什克腾旗草地主要营养类型为碳氮(CN)型。更多还原

【Abstract】 This paper takes remote sensing technology in combination of surface-truth field trip data to analyze the speciality and the nutritive value of grassland resources in Keshiketeng in 2008. Classification system of Keshiketeng grassland type is established and the informations of grassland speciality are taked from TM and MODIS satellite data to study the zonal distribution of grassland resources; The biomass models of grassland is established; The monitoring of grassland degradation is done based on the NDVI data; The paper has also done analysis of the nutritive speciality in Keshiketeng grassland and the main type of the nutrient in Keshiketeng grassland is classified. The data can be used as basic data for later dynamic detection. It can also provide theoretical basis for the sustainable use, protection and management of grassland resources in Keshiketeng.The main results showed as follows:1.The total grassland area of Keshiketeng Banner is 2063.60 ten thousand mu, the temperate steppe type is the most widely distributed in Keshiketeng. Compared to the date in 1988, there are two new sub-type which are the sandy temperate meadow-steppe sub-type and the wet lowland meadow sub-type.2.The biomass models of Keshiketeng grassland is established basd on MODIS -NDVI: y = 2493.46x - 1098.91(R2 = 0.68, p<0.001).3. The monitoring of grassland degradation was done which is based on the NDVI and surface-truth field trip data after the regression models of Keshiketeng grassland established which is based on the NDVI and surface-truth field trip data: y=187.94x-50.43(R2=0.72, p<0.001). The results of degradation analysis meet the requirements of the precition. Compared to the date in 1988, It is shown that Keshiketeng grassland has quite regional difference and has a representative degeneration trend from the eastern part to the western part.4. The crude protein supply of Sanguisorba officinalis、Carex pediformis、Stipa grandis type is the highest. The main type of the nutrient is CN type.更多还原