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[1]ZHANG Shangpeng,WANG Baiqun,CHAO Herong,et al.Extracellular Enzyme Activities and Microbial CUE Characteristics of Mossy Crust and Soil Substratum[J].Research of Soil and Water Conservation,2022,29(02):106-111.

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Extracellular Enzyme Activities and Microbial CUE Characteristics of Mossy Crust and Soil Substratum

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 02 Page number: 106-111 Column: Public date: 2022-03-20

Title:: Extracellular Enzyme Activities and Microbial CUE Characteristics of Mossy Crust and Soil Substratum

Author(s):: ZHANG Shangpeng^1,2, WANG Baiqun^1,2, CHAO Herong³, WANG Yuhan³; (1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, Yangling, Shaanxi 712100, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3.College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: mossy crusts; profile; nutrient; extracellular enzyme activities; microbial carbon utilization efficiency

CLC:: S154.1; S158.2

DOI:: -

Abstract:: To further clarify the influence of mossy crust on nutrients and the characteristics of microbial utilization of nutrients in soil substratum, the mossy crust and its soil substratum(0—2 cm, 2—5 cm, 10—20 cm)developed on the typical abandoned cropland in the loess hilly region were selected as the research samples, the status of carbon(C), nitrogen(N), phosphorus(P), extracellular enzyme activities and microbial CUE characteristics were analyzed. The results showed that the moss crust significantly improved the nutrient status of surface soil, and the contents of SOC, TN, TP, DOC, DON and Olsen-P in the crust layer were 2.58, 2.34, 1.13, 2.30, 4.30 and 7.36 times of those in 10—20 cm soil layer, respectively. Consisting with the characteristics of nutrient contents, the microbial biomass decreased gradually with the increase of soil depth. In the whole soil profile, the microbial community had a relatively stable element homeostasis to maintain its C, N, P equilibrium. The extracellular enzyme activities involved in C, N, and P cycles were significantly different in different soil depths. β-1, 4-glucosidase(BG)decreased with increase of soil depth, while β-1, 4-N-acetylglucosaminosidase(NAG)and alkaline phosphatase(AP)showed a trend of decreasing first and increasing afterwards. The higher activities of NAG and AP in the soil substratum reflected the deficiency of N and P. Microbial CUE decreased at first and increased afterwars along the soil profile, with an average level of 0.25, reflecting that the habitat was more conducive to C sequestration in surface and deep soil. In addition, the results of variance decomposition(VPA)and linear model indicated that nutrient status and soil enzymes were the key factors affecting microbial CUE. In general, in different soil depths, mossy crusts have a positive effect on the nutrients and microbial metabolism of the topsoil, and the soil substratum maintains a high microbial C utilization efficiency despite the insufficiency of nutrients.

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Last Update: 2022-04-20