Effect of Nitrogen and Phosphorus Addition on Nutrient Content and Ecological Stoichiometry Characteristics of Wheat Soils in Loess Plateau
To investigate the effects of different nitrogen and phosphorus levels on total nutrient content,available nutrient content and ecological stoichiometry in agricultural soils,the authors analyzed the relationships between soil environmental factors,carbon(C),nitrogen(N)and phosphorus(P)content,and the ecological stoichiometry of total and available nutrients to elucidate the impact of different fertilizer levels on the dynamic balance of soil nutrients in agricultural fields.We selected spring wheat farmland soils in Loess Plateau as our research subject and conducted N and P addition experiments in 2017.The experimental treatments included a control group(CK),low nitrogen(LN),medium nitrogen(MN),high nitrogen(HN),low phosphorus(LP),medium phosphorus(MP)and high phosphorus(HP),totaling seven treatments.The results showed that:(1)nitrogen addition significantly increased the content of ammonium nitrogen(NH4+-N)and nitrate nitrogen(NO3-N)in the soil,while phosphorus addition significantly decreased the NH4+-N and NO3--N content(P＜0.05).The addition of nitrogen and phosphorus nutrients had no significant effect on total nitrogen(TN)content(P＞0.05).(2)N addition significantly increased soil C/N,C/P,N/P,C/AP and AN/AP ratios,and significantly decreased soil C/AN ratio(P＜0.05).P addition significantly decreased soil C/N,C/P,N/P,C/AP and AN/AP ratios,and increased soil C/AN ratio(P＜0.05).(3)Soil C/N and C/AN showed a significant negative correlation(P＜0.05),while C/P and C/AP,N/P and AN/AP showed a significant positive correlation.In conclusion,available nutrient content and available ecological stoichiometry in agricultural soils in loess plateau region are more sensitive to N and P nutrient additions.
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