摘要
本文对农田防护林立地进行系统的研究,提出了三级分类单位:(1)立地级,(2)立地类型组,(3)立地类型。首先采用数量化理论Ⅰ的方法对所有立地因子进行筛选,筛选出的主导立地因子为 A 层厚度、石灰反应、土壤类型和有机质,然后用主导因子采用系统聚类方法进行分类,共划分出四个立地级,11个立地类型组,进行方差分析检验证明,分类结果是正确的。依据 Storie 指数(SIR)原理,采用复合法提出了立地生产力的评价公式 SP=5(A+B+C+DX)。并计算出不同立地级的立地生产力的变动范围。在上述分类的基础上,又对草甸黑钙土立地类型组进行更详细的调查,划分了三个立地类型并绘制了立地因子的等值线图和立地类型图。
The windbreak site is researched in Zhao Dong city.Three classi- fic units are made:site classes,site type groups,site types The main site factors are sievied by Numerial Theory Ⅰ.four site classes and cleven site type groups are taken by using system clus- ter with the main factors.The site productivity is evaluated by comp- ound method according to The Stories Index principle. The meadow chernozem site type group is investigated in detail in XianJin township zhao Dong city.It is divided into three site types.The map of forest site type and isogram of the pH—value at 30cm,the volume weight at 10cm,the Organic matter at 30cm are drawn respectively.
关键词
农田防护林
立地分类
立地生产力
立地图
shelter belt to protect farmland
site ctassification
site productivity
site map
