旱地土壤有机碳氮和供氮能力对长期不同氮肥用量的响应

doi:10.3864/j.issn.0578-1752.2016.15.013

Abstract

Abstract: 【Objective】The purpose of this study is to reveal the response of soil organic carbon, organic nitrogen and soil N mineralization to different N application rates and their relationships, and then to evaluate soil N supply capacity in dryland soil. 【Method】A ten-year-old winter wheat (Triticum aestivum L.) field experiment with N application rates (0 (N0), 160 (N160) and 320 (N320) kg·hm^-2, plus 100 kg P₂O₅·hm^-2) in the experiment farm of Northwest A&F University, Yangling, Shaanxi Province was conducted to determine soil organic carbon (SOC), N (SON), microbial biomass C (MBC) and biomass N (MBN) and a laboratory incubation method was used to determine the capacity of soil nitrogen (N) mineralization. 【Result】Compared with N0 treatment, N fertilization treatments (N160 and N320) significantly increased SOC at 0-10, 10-20, 20-40 and 0-40 cm soil depths, and they had different effects in the stages of wheat pre-sowing and harvest; N160 and N320 treatments also significantly increased SON at 0-10 cm soil depth, and N320 treatment only increased SON at 0-40 cm soil depth; N fertilization treatments (N160 and N320) did not change MBN and MBC concentrations at 0-10 and 10-20 cm depths, while N320 treatment significantly increased MBN concentrations at 20-40 and 0-40 cm depths. In 0-10 cm soil depth, the amount of cumulative mineralized N and potentially mineralizable N (N₀) had a significant positive correlation with N fertilizer rates and SON, while N mineralization rate constant (k) had a negative correlation with them. In 10-20 cm soil depth, during the whole incubation process, the amount of cumulative mineralized N in different N treatments was significantly higher than that in N0 treatment, with the increment of 27.3% (N160) and 35.2% (N320), respectively, and there was a significant positive correlation between cumulative mineralized N and SON, SOC as well as N rates. The potentially mineralizable N (N₀) significantly increased with the increment of N fertilizer application rate, while the N mineralization rate constant (k) decreased. In 20-40 cm soil depth, the amount of cumulative mineralized N increased with the treatment of N320 and had a significant positive correlation with soil MBC and SON. 【Conclusion】Applying a reasonable rate of N fertilizer is one of the effective practices to improve the soil organic N and organic C concentrations in the dryland of Loess Plateau, and can also increase the soil potentially mineralizable N, reduce the N mineralization rate, thus improve soil N supply capacity.

Key words: soil nitrogen mineralization, potentially mineralizable nitrogen, microbial biomass carbon and nitrogen, organic carbon and nitrogen, Loess Plateau

WANG Hui, LIU Jin-shan, HUI Xiao-li, DAI Jian, WANG Zhao-hui. Responses of Soil Organic Carbon, Organic Nitrogen and Nitrogen Supply Capacity to Long-Term Nitrogen Fertilization Practices in Dryland Soil[J].Scientia Agricultura Sinica, 2016, 49(15): 2988-2998.

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