Effects of land use on soil microbial biomass and community structure in the loess hill region of west Henan

doi:10.11686/cyxb2016057

Abstract

Abstract: In order to uncover the effects of different land use systems on soil microbial biomass and community structure characteristics, we selected five land use types; woodland, shrub land, orchard, abandoned farmland and farmland. We analyzed soil phospholipid fatty acids (PLFAs). Compared with the farmland, woodland increased soil microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) content by 225.38% and 206.19% respectively (P<0.05) while the MBC/total organic carbon (TOC) and MBN/TN value increased by 2.89 and 5.05 respectively (P<0.05). Shrub land increased soil MBC and MBN content by 265.73% and 245.03% respectively (P<0.05), the MBC/TOC and MBN/TN value increased by 3.00 and 5.57 respectively (P<0.05). Orchard management increased soil MBC and MBN content and MBN/TN value by 107.80%, 84.99% and 1.23 respectively (P<0.05). There was no difference in MBC and MBN and microbial biomass phosphorus (MBP) between the abandoned farmland and farmland soil (P>0.05). Bacterial and fungal PLFA in woodland soil increased by 17.87% and 24.27% respectively compared to farmland (P<0.05) while in shrub land these traits increased by 17.18% and 28.45% respectively (P<0.05). Orchard soil bacterial PLFA content was increased by 9.0% (P<0.05). Soil bacteria, fungi and actinomycetes PLFA in abandoned farmland and farmland were similar (P>0.05). The Shannon diversity index and Pielou evenness index of woodland and shrub land were significantly higher than other systems (P<0.05) while the Simpson dominance index was significantly decreased (P<0.05). The PLFA content of soil bacteria, fungi, and actinomycetes was significantly, positively correlated with TOC, MBC, total nitrogen (TN), available nitrogen (AN), MBN and bulk density (BD) (P<0.05 or P<0.01). The results showed that compared with farmland, abandoned farmland and orchard soil, soil microbial diversity of woodland and shrub land is enhanced; microbial species are uniformly distributed and community structure is relatively stable. This indicates that woodland and shrub land are superior for improving soil quality and microbial community structure diversity. The input of nutrients and the change of soil structure caused by different land use patterns is one of the reasons for the change of microbial community structure.

LIU Jing, ZHAO Yan, ZHANG Qiao-Ming, XU Shao-Jun. Effects of land use on soil microbial biomass and community structure in the loess hill region of west Henan[J]. Acta Prataculturae Sinica, 2016, 25(8): 36-47.

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