摘要
通过对三江源区120个野外调查样区的数据分析，依据地形条件以及工程的需要，将“黑士滩”退化草地划分为三种类型，即Ⅰ滩地：坡度在0～7°之间，Ⅱ缓坡地：坡度在≥7～25°之间，Ⅲ陡坡地：坡度≥125°。通过聚类分析和主成分分析，优选出秃斑地比例和可食牧草比例作为“黑土滩”退化草地分级的主要指标，将其分为轻度、中度和重度，并提出了相应的治理模式。
Through analysis of data from 120 sampling sections investigated in field in Three Rivers Headwater Region, ＂black-soil-beach＂ degraded grasslands were divided into three types：Ⅰ was bottomland, gradient of which was between 0 and 7 degree, Ⅱ was low sloping-land, gradient of which was between 7 and 25 degree, and Ⅲ was steep sloping-land, gradient of which exceed 25 degree, according to landform condition and demand of project. Besides, based on methods of clustering and main component analysis to every characteristic parameter, ratio of barren grassland and palatable forage were selected out as graded standard of＂ black-soil-beach＂ degraded grassland, and then, they were divided into light, middle and heavy＂ black beach＂ degraded grassland Finally, according as degraded and classified standards,relevant control measures were determined.
出处
《青海畜牧兽医杂志》
2008年第3期1-3,共3页
Chinese Qinghai Journal of Animal and Veterinary Sciences
基金
国家"十五"科技攻关计划重大项目(2001BA606A-02)
2005年度青海三江源自然保护区生态保护和建设总体规划科研课题及应用推广招标项目(2005-SN-1)
国家"十一五"科技支撑计划重大项目(2006BACOLA-02)
关键词
三江源区
“黑土滩”退化草地
分级
分类
Three Rivers Headwater Region
＂Black-soil-beach＂ degraded grassland
Gradation
Classification
