摘要
采用稀释平板涂布法研究3个施氮量水平对不同栽培模式玉米根区土壤中可培养细菌、真菌和放线菌数量的差异性。结果表明,施氮能大大促进覆膜玉米根区土壤细菌、放线菌及覆草模式真菌数量的增加。玉米根区土壤微生物数量主要受玉米根系的影响,根外土壤微生物的数量主要受施氮量的影响。施氮能缩小常规模式玉米根区与根外土壤细菌和真菌数量的差异,增大常规模式玉米根区与根外土壤放线菌数量的差异,还能缩小覆盖模式玉米根区与根外土壤中3大类微生物数量的差异。玉米根区土壤微生物数量高于根外,但施氮量较高(240kg/hm2)时,在覆膜和常规对照条件下土壤真菌数量及覆草模式下土壤细菌数量表现为根外高于根区。
Effects of 3 nitrogen application on the amount of cultivable soil bacteria, fungi and actinomycetes both in rhizosphere of maize under different cultural modes were investigated by using plate culture method. The results showed that the amount of soil bacteria and actinomyeetes in maize rhizosphere under plastic file mulching and amount of fungi under straw mulching increased after applying nitrogen. The amount of soil microorganisms in maize rhizosphere were effected by maize root, but the amount of soil microorganisms in bulk soil of maize were influenced by using nitrogen. Difference of soil bacteria and fungi number between maize rhizosphere and bulk soil of maize were shortened by using nitrogen under conventional planting mode, but the difference of soil actinomycetes number between maize rhizosphere and bulk soil of maize were augmented by using nitrogen. And differences of soil micro-organisms number between maize rhizosphere and bulk soil of maize were shortened by using nitrogen under mulching modes. Generally speaking, the amount of soil microorganisms in rhizosphere were higher than those in bulk soil of maize, but it was contrary on soil fungi under plastic file mulching and conventional mode and on soil bacteria under straw mulching when applied much nitrogen （240 kg/ha）.
出处
《玉米科学》
CAS
CSCD
北大核心
2009年第4期107-111,共5页
Journal of Maize Sciences
基金
国家自然科学基金重点项目(30230230)
关键词
玉米根系
施氮量
土壤微生物
Maize root
Nitrogen application
Soil microbial
