内蒙古沙地云杉生长与生态条件关系的研究

Relationship between ecological conditions and spruce growth on sandy land

本文根据实地调查和定位观测资料,分析了沙地云杉生长状况与生态条件的关系。沙地云杉的日高生长为昼夜生长类型,夜间生长高于昼间的146—279％。6月份高生长占全年生长量的65％,年高生长量大小取决于6月份的水热条件,在正常的年份,树高生长量较大,反之较小。沙地云杉高生长与土壤含水量有密切关系,沙丘上部比下部含水量少,高生长较低。沙地云杉为耐阴性树种,在幼年期一定程度的遮阴条件可以促进树高生长。20年以后,随年龄的增加,光强达到45％时为树高生长最大值。

Based on fiedl survey and located observation, the relationship between ecological conditions and spruce growth is analysed. The daily height growth of spruce is of continuous growing type, its growth at day time is higher than that at night, being 146-279％. Height increment in June is 65％ of annual increment. The annual height increment depends on the heat and moisture conditions in June. In normal years, the height increment is greater, and less in reverse. The height growth of spruce is closely related to soil moisture content, which is lower at the top of dune than at its bottom. Spruce on sandy land is a shade-tolerant species, the height growth of its seedlings being accelerated under shady condition. After 20 years, the height growth increment is maximum with increasing age when light intensity is 45％.