| Effect of soil biological crust on the distribution of soil microorganisms in the loess hilly region |
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| DOI：10.7606/j.issn.1000-7601.2011.04.20 |
| Key Words: soil biological crust the number of soil microorganisms the loess hilly region |
| Author Name | Affiliation | | BIAN Dandan | College of Forestry/College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agriculture Resources and Ecosystem Remediation of Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | LIAO Chaoying | College of Forestry/College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agriculture Resources and Ecosystem Remediation of Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | SUN Changzhong | Experimental Center of Forestry in North China, Chinese Academy of Forestry, Beijing 102300, China | | LI Xiaoming | College of Forestry/College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | XU Yongxia | College of Forestry/College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agriculture Resources and Ecosystem Remediation of Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | TANG Haibin | College of Forestry/College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agriculture Resources and Ecosystem Remediation of Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Study was made on the effect of soil biological crust on the distribution of soil microorganisms in Pianguan area by using the statistics of the quantity of soil microorganisms of soil and soil biological crust under 4 kinds of main vegetation and abandoned land, so as to find out the biological effects of soil biological crust and influencing factors of the quantity of soil microorganisms. The results show that: ① In all the microbial groups, bacteria are the largest group and followed by actinomycetes while fungi are the least. ② The quantity of soil microorganisms among different vegetations are significantly different (P＜0.05), it decreased with the abandoned land fallow period and tend to increase with the pine planting years. ③ Among different soil levels, crust layer is predominant, followed by 0～5 cm, 6～10 cm the next,
11～20 cm the least, bacteria and the total number of microorganisms are significantly different, actinomycetes and fungi decreased with the depth. ④ The cov
erage of soil biological crust affects the quantity of soil microorganisms, and microbial content in soil with crust is obviously higher than that in soil without crust. The quantity of bacteria reach the peak value at soil with medium—thick crust, the maximum quantity of actinomycetes and fungi are located at soil with thin—layer crust. |
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