| Effect of different gravel mulched years on soil microflora and physicochemical properties in gravel-sand mulched field |
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| DOI：10.7606/j.issn.1000-7601.2017.04.28 |
| Key Words: arid and semi-arid area gravel and sand mulched field (GSMF) different mulched year soil microbe environment factors |
| Author Name | Affiliation | | PANG Lei | Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of sciences, Lanzhou, Gansu 730000, China
Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LU Jian-long | Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHOU Mao-xian | Lanzhou University of Finance and Economics, Lanzhou, Gansu 730101, China | | XIAO Hong-lang | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of sciences, Lanzhou, Gansu 730000, China | | FAN Zhi-long | Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHAI Shou-xi | Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Soil microflora and physicochemical properties at soil and gravel-sand mixed layer (SGSML), roots denseness layer (RDL), eluvial layer (EL) and Calcic horizon layer (CAL) in gravel-sand mulched field (GSMF) with different gravel mulched years (1, 6, 12, 19 a and 25 a respectively) were investigated. The results indicated that (1) Among the soil microorganisms of the GSMF, bacteria population was greatest, actinomycete was followed, and fungi was the least one. As the deeper of the soil profile, the soil microorganisms population was decreased rapidly that mainly result from rapidly decreasing of bacteria population. Soil microbial population in RDL was greater compared with that of SGSML with fewer roots due to effect of different crop roots distribution. (2) Population of bacteria and actinomycete in crop growth period was greater than that of the fallow season, while the fungi population in crop growth period was lower than that of the fallow season. (3) Bacteria and fungi population reached the maximum number when the gravel mulched with 6 a to 12 a. Bacteria and fungi population was decreased as increasing of gravel mulched years due to gradually aging of GSMF. The actinomycete population was the other way round. (4) Good correlation was found between soil microbial population of GSMF and soil water content, pH, gravel mulched years. Soil total C content was one of the important factors restricting the soil microbial developing. |
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