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柳树农田防护林造林效果及遮荫作用研究.pdf

花匠小妙招
2025-09-14 22:03

第28卷第1期水土保持通报 Vo1．28。No．1 2008年2月 Buttetin of Sol1 and Water Conservation Feb．，2008 柳树农田防护林造林效果及遮荫作用研究杨斌，石培贤。，刘淑明。 (1．甘肃省林业科技推广总站，甘肃兰州730046； 2．临夏州林业科学研究所，甘肃临夏731801；3．西北农林科技大学理学院，陕西杨凌 712100) 摘要：以苏柳无性系和青刚柳营造农田防护林试验，结果发现，J194柳的成活率和保存率最高，分别达到96．6 和93．2 。不同树种(或无性系)，不同株行距的成活率及保存率差异不明显。苏柳无性系的树高生长显著大于青刚柳，表明苏柳无性系更适于农田防护林的营造。对J172柳在农田防护林的遮荫作用进行研究，结果发现，柳树(株行距3 m×6 m)6 a生的遮荫指数为56．62 ，遮荫程度为13．31 。13 的遮荫程度是柳树农田防护林的最高遮荫上限，柳树生长到第5 a以后，应适当间伐。关键词：柳树；农田防护林；遮荫程度；遮荫指数文献标识码：A 文章编号：1000 288X(2008)01一OO34～O5 中图分类号：$727．24 Effects of Farmland Shelterbelt by Willows and Their Shading Performances YANG Bin ．SH I Pei—xian ，LI U Shu—ming。 (1．Forestry Scientific Technology Extension Station oJ Gansu，Lanzhou，Gansu 730046，China； 2．Forestry Research Institute of Linxia，Linxia，Gansu 731800，China； 3．College of Science，Northwest AF University，Yangling，Shaanxi 712100，China) Abstract：Effects of afforestation of farmland shelterbelt with clones or cultivars of Salix jiangsuensis and S． viminalis and their shading performances were investigated．Results showed that both survival and preserva— tion rates of the S．jiangsuensis 194 were 96．6 and 93．2％，respectively．There were no differences of sur— vival and preservation rates among different cultivars or clones and different planting spaces．Tree height in— crement of S．jiangsuensis was higher than that of S．viminalis，indicating that S．jiangsuensis is a suitable species for farmland shelterbelt．Shading index and shading degree of the 6-year—old S．jiangsuensis 172 (spacing 3 m×6 m)were 56．62 and 13．31 ，respectively，exceeding the upper limit of farmland shelter— belt．Therefore，the S．jia