民勤绿洲外围不同林龄人工梭梭林的土壤水分特征  

Soil Water in Planted Haloxylon ammodendron Shrubland of Different Age outside Minqin Oasis

作　　者：朱雅娟[1] 贾志清[1] 刘丽颖[1] 刘海涛[1] 

机构地区：[1]中国林业科学研究院荒漠化研究所,北京100091

出　　处：《中国沙漠》2011年第2期442-446,共5页Journal of Desert Research

基　　金：中国林业科学研究院林业研究所重点项目(ZD200908);国家"十一五"科技支撑计划专题(2006BAD26B0101);国家科技支撑计划专题(2007BAD46B02-3)共同资助

摘　　要：2009年6月到9月,每月中旬在民勤绿洲边缘不同林龄(2 a,5 a,10 a,20 a,30 a)的人工梭梭林内测试不同深度(20 cm,30 cm,50 cm,100 cm,150 cm和200 cm)的土壤含水量变化情况。分析结果表明,不同林龄的梭梭林内土壤含水量与时间和深度有关。土壤表层含水量主要受自然降雨控制,8月底发生比较大的自然降雨后,9月不同林龄梭梭林内20 cm和30 cm的含水量显著高于其他3个月。土壤50 cm以下的含水量比较稳定,当降雨少,土壤表层含水量低时,可以作为梭梭利用的水分来源。在7月和8月,5 a梭梭林内土壤含水量最低,表明梭梭对土壤水分的消耗最多,栽植密度过大,因此,需要间伐减少植株数量才能维持其稳定性。Soil water contents at different depths（20 cm,30 cm,50 cm,100 cm,150 cm and 200 cm） were examined in planted Haloxylon ammodendron shrubland of different stand age（2-year,5-year,10-year,20-year and 30-year） outside Minqin oasis from June to September,2009.The results showed that soil water contents in H.ammodendron of different stand age were related to precipitation and soil depth.Soil water content at surface layer was affected by natural rainfall.In September,soil water contents at 20 cm and 30 cm in H.ammodendron of different stand age were significantly higher than that in other three months because of 25.8 mm rainfall in late August.Soil water content was relatively stable in deeper depths（50 cm） and it can be used by H.ammodendron when surface soil water was absent in period with lower rainfall.In July and August,soil water content in planted 5-year H.ammodendron shrubland was the lowest（1%） because the plant density was too high for 5-year planted H.ammodendron shrubland,and the consumption amount of soil water was the highest;therefore,planted shrubland may need to be lumbered to decrease plant number to keep its stability.

关 键 词：土壤含水量 土壤深度 林龄 

分 类 号：Q948.11[生物学—植物学]