| Effects of mulching and maize root on ecological distribution of soil antagonistic actinomycetes in semiarid area of northwest China |
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| DOI：10.7606/j.issn.1000-7601.2008.06.03 |
| Key Words: antagonistical actinomycetes ecological distribution mulching model maize root |
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| Abstract: |
| Distribution of antagonistic actinomycetes on different mulching models and maize root in China’s Northwest dry farming area was studied by the method of normal isolating and agar block. The results indicated that ：（1） The percentage of antagonistic actinomycetes was different with mulching models in maize field. It was higher under the fallow and plastic fil m mulching models than conventional comparison and straw mulching and supplemental irrigation was the lowest on GA．On SDSA it was higher under mulching （plastic film mulching and straw mulching） than conventional comparison. （2） The percentage of antagonistic actinomycetes was remarkably affected by the growth and secretion of maize root. In maize rhisophere maize root reduced the percentage of antibacterial and antifungal by 59．7％and 45．2％compared with maize bulk soil under plastic film mulching. But under straw mulching maize root increased the percentage of antibacterial and antifungal by 84．5％and 106．4％compared with maize bulk soil. And after planting maize the percentage of soil antagonistic actinomycetes was under that of fallow field. （3） Multiplex comparison showed that the i mpact of maize root to be antagonistic actinomycetes ratio was greater than cultural patterns. |