毛乌素沙地中国沙棘存活及生长对灌水和密度的响应

摘要

In order to understand the relationship between water conditions and afforestation effect of Hippophae rhamniodes subsp sinensis in MuUs sand-land, different irrigation intensities and initial density on survival rate and growth increment of the young forest were analyzed. The results showed that optimum irrigation intensity existed, the survival rate and growth increment increased and then decreased as the increase of irrigation intensity. The optimum irrigation intensities for survival and growth were 1 200 mm and 1 500 mm, respectively.It also has an optimum initial density. The survival rate and growth increment of ground diameter and crown width increased and then decreased as the increase of initial density.The optimum initial density for survival was 4 444 ind · hm-2.%为了解毛乌素沙地水分条件与中国沙棘造林成效的关系,对不同灌水强度和初植密度幼林的成活率及生长量进行了对比分析.结果表明:存活率和生长量随着灌水强度的增大呈先升后降的趋势,适宜于存活的最佳灌水量为1 200 mm,适宜于生长的最佳灌水量为1 500 mm;存活率及地径、冠幅生长量随着初植密度的增大也呈先升后降的趋势,适宜于存活的最佳造林密度为4 444.0株·hm-2.