| Study on soil micro flora in boundary soil layer of gravel and sand mulched field in arid and semiarid area of China |
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| DOI：10.7606/j.issn.1000-7601.2011.01.18 |
| Key Words: gravel and sand mulched field gravel-sand mulched and soil boundary layer micro flora environmental factors arid and semiarid area |
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| Abstract: |
| To study the soil microbial characters in gravel and sand mulched field (GSMF) in arid and semiarid area, the soil micro flora and the influence factors of GSMF and its boundary layer in different age of GSMF had been studied through experimentation. The results showed that the quantity of micro flora in boundary layer was bacteria＞actinomycete＞fungi. It is related on soil microbial number and the age of GSMF, that is the number of bacteria reached the highest number when the age of GSMF was 13 a. When the age of GSMF was 26 a, the number of fungi and actinomycete reached the highest number, and the percentage of actinom
ycete reached the highest rate of total microbial number too. That was with the aging degree adding of the GSMF, the number of bacteria decreased, and the number of fungi and actinomycete increased. So the number of microbial can be the target that forecast the aging degree of the GSMF. C source was one of the main factors that restrict microbial development. It was no significant influence to bacteria, fungi and actinomycete by pH value when it in lesser alteration. The soil respiration intensity was related to bacteria quantity. Soil moisture content is the main factor which restricts bacteria development. |
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