稻草覆盖和香根草篱对红壤坡耕地土壤酶活性和微生物群落结构的影响

doi:10.3864/j.issn.0578-1752.2017.23.013

Abstract

Abstract: 【Objective】 The objective of this paper is to clarify the relationship between soil organic carbon and microorganism under different biological water protection measures. 【Method】 Soil samples were collected from a field soil and water conservation measures experiment, which was started since 2009 with 4 treatments, including peanuts grown in high order (CK), hedgerows+ peanuts (H), mulching+ peanuts (M) and hedgerows+ mulching+ peanuts (HM). Phospholipid fatty acid (PLFA) profiles for each treatment were used to characterize the microbial community structure. Soil organic carbon, microbial biomass carbon, dissolved organic carbon and soil enzyme activities were also determined. 【Result】 Compared with the CK, all treatments showed total organic carbon, dissolved organic carbon, total microbial biomass carbon and qMB increased. H is the main influence factor on MBC and Qmb. The results showed that H significantly affected the activities of soil invertase, cellulase, β-Glu and intensity of MBC/TOC. Compared with the CK, H, M and HM, PLFA increased the total PLFAs, bacterial and actinomycetes PLFAs, while decreased G- PLFA/G+PLFA, and that was the lowest under HM treatment. Principal components analysis showed that soil microbial community structure was similar to that of H and M, which was larger difference with CK. Redundancy analysis showed that TOC, MBC and enzymes activities of soil CEL, INV, β-Glu were all the main factors affecting the quantity and structure of soil microorganisms. 【Conclusion】 Microbial biomass, community structure and soil normalized C-acquiring enzyme activity were influenced significantly by straw mulching and vetiver grass hedgerows.

Key words: red soil sloping land, straw mulching, Vetiver Grass Hedgerows, soil enzyme activity, microbial community structure

CHENG YanHong, HUANG QianRu, WU Lin, HUANG ShangShu, ZHONG YiJun, SUN YongMing, ZHANG Kun, ZHANG XinLiang. Effects of Straw Mulching and Vetiver Grass Hedgerows on Soil Enzyme Activities and Soil Microbial Community Structure in Red Soil Sloping Land[J].Scientia Agricultura Sinica, 2017, 50(23): 4602-4612.

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