苏北沿海防护林优化模式研究

用常规方法测定各模式林带生物量、各树种生长规律、各林地土壤理化性质以及各林带疏透度 ,从而对江苏省北部沿海 4种防护林模式进行了初步研究 .结果表明 :单位面积地上部分生物量年平均增长量以杨树林最大 ,水杉林、柳杉林次之 ,刺槐林最低 ;4种模式造林树种的生长快慢顺序是杨树 >水杉 >柳杉 >刺槐 ;由于树种不同、造林时间不等 ,4种模式沿海防护林对各林地土壤的改良效果也不同 ,表现出林龄大的较林龄小的强 ,刺槐为豆科乔木树种 ,对土壤性状的改良效应明显较水杉和杨树强

Optimal models of shelterbelts and their application in coastal protection forest construction in Jiangsu Province

Based on the measurement of tree biomass and growth regularity, soil properties and shelterbelt structure, the paper mainly deals with the optimal model selection and their application in northern part of Jiangsu Province. The results are as follows: The annual increment of biomass of poplar above ground is the greatest, followed by water fir( Metasequoia glyptostroboides ) and cryptomeria( Cryptomerio fortunei ), and that of black locust ( Robinia pseudoacacia )is the lowest. The growth speed of the four tree plantation models above is in the order: poplar>water fir>cryptomeria>black locust. By the way, there is a great difference in the effects of different plantation models on soil improvement function because of the difference of tree species, tree age and planting year. Black locust forest has stronger effects on soil improvement than water fir, poplar and cryptomeria. And some application technologies of the optimal models are put forward in this paper.