地膜覆盖边缘效应对土壤水分及杨树苗生长的影响  

The effects on Populus deltoides seedling growth and soil moisture by film mulching edge effect

作　　者：吴敏[1] 汤玉喜[1] 徐世凤[1] 吴立勋[1] 李永进[1] 唐洁[1] 

机构地区：[1]湖南省林业科学院,湖南长沙410004

出　　处：《湖南林业科技》2011年第6期56-58,共3页Hunan Forestry Science & Technology

基　　金：国家林业局公益性行业科研专项经费重大项目(201004004);湖南省林木种苗专项"杨树种质资源收集保存与良种选育"

摘　　要：针对杨树地膜覆盖扦插苗在苗床不同部位的生长差异现象,应用美洲黑杨湘林-75无性系1年生苗,采取不同苗木及苗床部位双因子试验设计方法,进行扦插育苗试验。结果显示:种苗不同部位扦插育苗的保存率、地径和苗高年生长量均无显著差异。在地膜仅覆盖苗床上面而裸露侧面情况下,由于地膜的边缘效应,边行土壤在8月中旬的土壤含水率比苗床中部下降10.8%;两边行与苗床中部苗木比较,成活率下降24.0%,地径下降38.1%,苗高下降38.2%,均达极显著差异水平。因此,育苗时床宽与所选地膜的宽度要匹配,使苗床侧面及边行也处于地膜的有效覆盖之内;并且,边行扦插时不宜太靠边。In order to observe the cutting propagation trial growth difference between seedlings in different seedbed parts,the one-year-old Populus deltoids Xianglin-75 clone seedlings covered by film were used as materials with two-factor experimental design.The results showed that there was no obvious difference in seedling surviv al,ground diameter and height among seedbed parts.Because of the film mulching edge effect,the soil moisture content in edge rows was 10.8% lower than that in middle part in August.Compared with middle part seedlings,the seedling survival,ground diameter and seedling height in edge rows were all significantly lower,and a reduced percentage of 24%,38.1% and 38.2% than that respectively.Thus,the match of seedbed width should with film width during propagation process,and the edge seedlings will be covered completely by film.And the seedling should be distance between edge row and the edge of seedbed.

关 键 词：杨树 扦插育苗 地膜覆盖 土壤含水率 保存率 生长量 

分 类 号：S792.119.05[农业科学—林木遗传育种]