修枝对吴堡县侧柏人工林层次结构的影响

Effect of Pruning on the Structure of Platycladus orientalis Plantation in Wubu

侧柏人工林是黄土高原主要的水土保持林之一,改善林分生长状况,对于减轻水土流失具有重要意义。本研究以25龄的侧柏人工林为研究对象,通过野外调查和室内分析相结合的方法,探讨了修枝对林分生长、更新、林下植物和林地土壤侵蚀的影响。结果表明:修枝后的林分平均高、更新幼苗的密度和高度,比对照分别增加了17.9%,61.6%和78.3%;修枝后的林分林下灌木和草本的盖度也高于对照林分;修枝后的林分林地土壤侵蚀量仅为对照林地的31.7%。

Platycladus orientalis plantation is one of vital forest types in soil and water conservation on the loess plateau.To improve growth of the stand is the efficient way to reduce soil and water loss in the region.Based on field investigation and sample analysis,responses of mean height of the stand,density of regenerated seedlings,height of seedlings,understory plants and soil erosion on pruning were explored.The results showed that in pruned stand,the indices,mean height of the stand,density of regenerated seedlings and height of seedlings,increament was 17.9%,61.6%and 78.3%respectively comparing to CK.Moreover,the pruning measure also enhanced coverage of shrubs and herbs.Soil erosion in pruned stand was merely 31.7%of CK.