摘要
按小地貌将四川巨桉主要引种区划分为丘陵立地类型小区和丘间平原立地类型小区,在两个小区内分别用主成分分析寻找主导立地因子,并分别选择土壤质地,坡位、坡度将两个立地类型小区划分为7个立地类型组;再在各立地类型组内用主导因子中的土壤物理和化学因子对样本进行聚类分析,划分出17个立地类型。对划分出的各个立地类型,采用立地指数为指标,将17个立地类型分为3个生产力等级。
Plain site type district and hill site type district are classified in the major introduction districts in Sichuan based on physiognomy. Principal component analysis is used in both districts to find out dominant factors, and 7 group of site types are clarified by using soil texture, slope gradient and slope position. In every group of site type, by using cluster analysis, 17 site types are classified based on the dominate factors of soil＇s physical and chemical properties and by using site index, these 17 site types are divided into 3 types of productivity grades.
出处
《四川农业大学学报》
CSCD
2005年第3期318-322,共5页
Journal of Sichuan Agricultural University
基金
国家"十五"科技攻关重大项目"四川盆地低山丘陵区水土流失综合治理技术与示范"部分内容。
关键词
四川
巨桉
引种区
立地类型划分
主成分分析
聚类分析
Sichuan
Eucalyptus grandis
introduction district
site type classification
principal component analysis
cluster analysis
