摘要
用15N示踪法研究了不同植物对根际及非根际微生物量氮周转率的影响。结果表明 ,不同植物对微生物量氮周转率的影响不同。栽种豆科植物三叶草由于其根系分泌物中的含氮有机物含量较高 ,所以土壤中微生物量氮的周转率快于栽种黑麦草。两种植物根际土壤的微生物量氮的周转率都快于非根际土壤 。
The turnover rate of microbial biomass nitrogen in the rhizosphere of clover (Trifolium prafensel) and ryegrass ( Lolium perence) was investigated with 15 N isotopic technique. The results showed that the activity of soil protease was higher in rhizosphere during the growth period of clover and ryegrass. It also indicated that the activity of soil protease of clover was higher than that of ryegrass. Turnover rate of biomass 15 N was in the following order:root zone>0～2mm>15～25mm>25～40mm. It is suggested that the principal function of microbe in rhizosphere is to accelerate the nutrient cycling compared to nonrhizosphere soil.
出处
《核农学报》
CAS
CSCD
北大核心
2001年第2期106-110,共5页
Journal of Nuclear Agricultural Sciences
基金
北京市自然科学基金重点资助项目
关键词
微生物量氮
周转率
根际土壤
黑麦草
三叶草
turnover rate
soil microbial N
soil protease
rhizosphere
clover
ryegrass
