北京林业大学学报2017，Vol.39Issue(7)：54-61,8.DOI:10.13332/j.1000--1522.20170076
2种扦插护岸植物根系对土壤结构的改良效应
Root distribution characteristics of two cuttage plants on bank slope and its effects on soil aggregates
摘要
Abstract
The root distribution characteristics of two cuttage plants ( five-year-old Salix alba var. tristis and Populus tomentosa) were measured by soil column method. The stability of water-stable aggregates and erodibility characteristics in different-layer soil under two cuttage plants were measured by rapid wetting treatment in Le Bissonnais method, and the measuring index included water-stable aggregates ( >0. 25 mm) content (R0.25), mean weight diameter of aggregates (MWD) and factor of soil erodibility (K). Root distribution characteristics of two cuttage plants on the slope and their effects on soil aggregates were analyzed. The results showed that:1) the roots of two cuttage plants mainly distributed in the 0-40 cm soil layer around the trunk, with >5 mm thick roots as the main components. 2) In the 0-100 cm soil layer, the root content, soil aggregate stability and soil erosion resistance decreased with the increase of soil depth. 3 ) In the aspect of increasing soil aggregate stability and erosion resistance through root system, Salix alba var. tristis was better than Populus tomentosa. 4 ) R0. 25 and <1 mm root content showed a significantly positive correlation, indicating that the performance of roots in improving soil aggregate structure was mainly determined by <1 mm root content.关键词
扦插/金丝柳/毛白杨/根系分布/土壤团聚体Key words
cuttage/Salix alba var. tristis/Populus tomentosa/root distribution/soil aggregate分类
农业科技引用本文复制引用
孙一惠,马岚,张栋,夏晓平,薛孟君,苗新云..2种扦插护岸植物根系对土壤结构的改良效应[J].北京林业大学学报,2017,39(7):54-61,8.基金项目
北京市科技计划课题(Z151100001115001)、西宁防洪及流域管理利用世行贷款项目(XN-C-2012-04)、 国家自然科学基金项目(41501297). （Z151100001115001）
