摘要
采用剥落分离法对三倍体毛白杨+黑麦草与三倍体毛白杨+自然草2种模式的根际与非根际土化学特性进行研究表明:两模式林地非根际土C/N值和pH值均大于其对应的根际土。自然草模式根际与非根际土C/N值大于黑麦草模式根际与非根际土,而pH值却相反,黑麦草模式根际(或非根际)土pH值大于的自然草模式根际(或非根际);两模式根际与非根际土N/P值(有效N与有效P的比值)接近14:1;两模式根际与非根际土速效K在4—5月均处于低谷,10—11月处于高峰;黑麦草模式根际土C/N值与速效K呈现较显著正相关,自然草模式根际土C/N值与N/P值呈现较显著正相关。
The rhizosphere and non-rhizosphere soils were sampled by peeling the adhering soil of the tree roots in two types of herbages,planted in the triploid of Populus tomentosa woodland, which was converted from cropland to forest. The results showed that C ： N ratio and pH in non-rhizosphere were bigger than those in rhizosphere in the corresponding patterns. The C ： N ratio of rhizosphere and non-rhizosphere in natural herb pattern was bigger than that in ryegrass （Lolium multiflorum L. ） pattern,while the pH was reverse. The N ： P ratio （the ratio of available nitrogen to available phosphorus） of rhizosphere and non-rhizosphere soils in two types approached the Red field ratio （14 ： 1）. And the available potassium was the lowest from April to May,while maximal from October to November. The correlation between C ： N ratio and available potassium in ryegrass type,C ： N and N ： P ratio in natural herb type of rhizosphere soils of Populus tomentosa was positive significant,with the correlation coefficients 0. 639 7 and 0.712 5 respectively.
出处
《水土保持研究》
CSCD
北大核心
2008年第2期107-110,116,共5页
Research of Soil and Water Conservation
基金
国家教育部重点学科博士点基金(20050626001)
国家"十一五"科技支撑项目(2006BAC01A11)
四川省教育厅重点实验室项目(2006ZD006)共同资助
关键词
三倍体毛白杨
黑麦草
根际
非根际
C/N值
Triploid of Populus tomentosa
Lolium multiflorum L.
rhizosphere
non-rhizosphere
C ： N ratio
作者简介
刘朔（1980-），男，四川开江人，硕士，主要从事生态环境建设和林业可持续发展研究。E-mail：lxw@sicau．edu．cn
通信作者：李贤伟。
