沙地人工刺榆围栏生长及分化的初步研究  

Preliminary Study on Growth and Differentiation of Hemiptelea davidii Fences in Sand-land

作　　者：曹宇[1] CAO Yu(Liaoning Institute of Sandfixation and Afforestation, Fuxin 123000)

机构地区：[1]辽宁省固沙造林研究所,阜新123000

出　　处：《林业科技》2017年第2期28-31,共4页Forestry Science & Technology

基　　金：辽宁省科学技术计划项目(2015103024);中央财政林业科技推广示范资金项目(辽2016TG14)

摘　　要：对彰武沙地4种典型立地条件下,6年生人工刺榆围栏生长情况进行调查的结果表明,在立地条件较好的平缓沙地、丘间低地和固定沙丘下部,刺榆的生长比较稳定,造林保存率均在80%以上,与立地条件相对较差的固定沙丘上部相比,刺榆的各主要生长指标均差异显著,造林保存率为47%。在未经人工干预状态下,4种立地条件刺榆林分地径离散度均在1.0以上,小于平均地径累计株数均超过1/3,表明在现行密度条件下,刺榆林分的生长已出现明显分化,立地条件的异质性和初植密度过大是林分发生分化的主要因素。各标准地刺榆林分普遍存在边行优势,但对林分生长影响并不显著。Investigations on the growth of six years old Hemiptelea davidii fences in4typical sites ofZhuangwu sand-land.The analysis shows that the growth of Hemiptelea davidii was steadied and theplanting preservation rate was above80%in flat sandy land,inter-dune lowland and lower dunes,comparedwith the main growth indexes were significantly different and planting preservation rate was47%in upperdunes.Under the condition of no tending-thinning,the ground diameter dispersion of Hemiptelea davidii in4site conditions was more than1.0,and the cumulative number less than the average was more than1/3,theresults that the stand growth had obvious differentiation under the present density condition,and theheterogeneity of site condition and the initial planting density were the main factors of forest differentiation.The presence of edge effects in the each sample plot,but no significant effect on tree growth.

关 键 词：沙地 刺榆 生物围栏 立地条件 生长分化 

分 类 号：S759.2[农业科学—森林经理学] S792.19[农业科学—林学]