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[1]ZHOU Weiying,YANG Mingyi.Analysis on Stoichiometry Characteristics of Soil Carbon, Nitrogen and Phosphorus in Small Watershed of the Loss Plateau[J].Research of Soil and Water Conservation,2018,25(03):17-22,28.

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Analysis on Stoichiometry Characteristics of Soil Carbon, Nitrogen and Phosphorus in Small Watershed of the Loss Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 03 Page number: 17-22,28 Column: Public date: 2018-04-10

Title:: Analysis on Stoichiometry Characteristics of Soil Carbon, Nitrogen and Phosphorus in Small Watershed of the Loss Plateau

Author(s):: ZHOU Weiying^1,2, YANG Mingyi^1,2; 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: stoichiometry characteristic; C:P; sediment; rainfall erosivity

CLC:: S153.6

DOI:: -

Abstract:: The check dam sediment and soils in three types of land-use of Wangmaogou Watershed in Suide County of Shaanxi Province were collected. To reproduce the change of erosion environment in small watershed, based on periodic change of sediment yield and rainfall erosivity, carbon(C), nitrogen(N) and phosphorus(P) stoichiometry of soil in small watershed and check dam sediment were analyzed. The results indicated that:(1) the mean contents of soil carbon, nitrogen and phosphorus were 3.36 g/kg, 0.35 g/kg, 0.68 g/kg, the mean values of C:N, C:P, N:P were 9.30, 5.75, 0.60, lower than average of those of China soils; The mean contents of sediment carbon, nitrogen and phosphorus were 1.76 g/kg, 0.20 g/kg, 0.55 g/kg; soil C:N, C:P, N:P of the study area reflected the fast soil mineralization but lack of nitrogen, which limited the growth of plants; (2) C:P ratios among different land-used types, soil and sediment presented significant differences, which means of C:P can be used as the sensitive index indicating the response of sediment to land use types; (3) according to sediment yield, rainfall erosivity and C:P value accumulation curve, erosion can be divided into four phases, and on the basis of the relationship between rainfall erosivity and sediment yield, the contributions of the different stages of rainfall and land use change to erosion and sediment can be determined.

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