Journal of Integrative Agriculture ›› 2014, Vol. 13 ›› Issue (12): 2768-2777.DOI: 10.1016/S2095-3119(13)60679-6

• 论文 • 上一篇    下一篇

The Effects of Three Mineral Nitrogen Sources and Zinc on Maize and Wheat Straw Decomposition and Soil Organic Carbon

 Ogunniyi Jumoke Esther, GUO Chun-hui, TIAN Xiao-hong, LI Hong-yun, ZHOU Yang-xue   

  1. College of Natural Resources and Environment/Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling 712100, P.R.China
  • 收稿日期:2013-01-13 出版日期:2014-12-01 发布日期:2014-12-10
  • 通讯作者: TIAN Xiao-hong, Mobile: 13572940885, Fax: +86-29-87080055, E-mail: txhong@hotmail.com, txhong@nwsuaf.edu.cn
  • 作者简介:* These authors contributed equally to this study.
  • 基金资助:

    This research was supported by the Key Technologies R&D Program of China during the 12th Five-Year Plan period(2012BAD14B11), the National Natural Science Foundation of China (41371288, 31071863), and the Fundamental Research Funds for Northwest A&F University, China (QN2011074).

The Effects of Three Mineral Nitrogen Sources and Zinc on Maize and Wheat Straw Decomposition and Soil Organic Carbon

 Ogunniyi Jumoke Esther, GUO Chun-hui, TIAN Xiao-hong, LI Hong-yun, ZHOU Yang-xue   

  1. College of Natural Resources and Environment/Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling 712100, P.R.China
  • Received:2013-01-13 Online:2014-12-01 Published:2014-12-10
  • Contact: TIAN Xiao-hong, Mobile: 13572940885, Fax: +86-29-87080055, E-mail: txhong@hotmail.com, txhong@nwsuaf.edu.cn
  • About author:* These authors contributed equally to this study.
  • Supported by:

    This research was supported by the Key Technologies R&D Program of China during the 12th Five-Year Plan period(2012BAD14B11), the National Natural Science Foundation of China (41371288, 31071863), and the Fundamental Research Funds for Northwest A&F University, China (QN2011074).

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摘要： The incorporation of straw in cultivated fields can potentially improve soil quality and crop yield. However, the presence of recalcitrant carbon compounds in straw slow its decomposition rate. The objective of this study was to determine the effects of different nitrogen sources, with and without the application of zinc, on straw decomposition and soil quality. Soils were treated with three different nitrogen sources, with and without zinc: urea (CO(NH2)2), ammonium sulfate ((NH4)2SO4), and ammonium chloride (NH4Cl). The combined treatments were as follows: maize (M) and wheat (W) straw incorporated into urea-, ammonium sulfate-, or ammonium chloride-treated soil (U, S, and C, respectively) with and without zinc (Z) (MU, MUZ, WU, WUZ; MS, MSZ, WS, WSZ; MC, MCZ, WC, WCZ, respectively); straw with zinc only (MZ, WZ); straw with untreated soil (MS, WS); and soil-only or control conditions (NT). The experiment consisted of 17 treatments with four replications. Each pot contained 150 g soil and 1.125 g straw, had a moisture content of 80% of the field capacity, and was incubated for 53 days at 25°C. The rates of CO2-C emission, cumulative CO2-C evolution, total CO2 production in the soils of different treatments were measured to infer decomposition rates. The total organic carbon (TOC), labile organic carbon (LOC), and soil microbial biomass in the soils of different treatments were measured to infer soil quality. All results were significantly different (P<0.05) with the exception of the labile organic carbon (LOC). The maize and wheat straw showed different patterns in CO2 evolution rates. For both straw types, Zn had a synergic effect with U, but an antagonistic effect with the other N sources as determined by the total CO2 produced. The MUZ treatment showed the highest decomposition rate and cumulative CO2 concentration (1 120.29 mg/pot), whereas the WACZ treatment had the lowest cumulative CO2 concentration (1 040.57 mg/pot). The addition of NH4Cl resulted in the highest total organic carbon (TOC) concentration (11.59 mg kg-1). The incorporation of wheat straw resulted in higher microbial biomass accumulation in soils relative to that of the maize straw application. The results demonstrate that mineral N sources can affect the ability of microorganisms to decompose straw, as well as the soil carbon concentrations.

关键词: nitrogen sources , zinc , carbon fractions , straw mineralization , wheat straw , maize straw , LOC

Abstract: The incorporation of straw in cultivated fields can potentially improve soil quality and crop yield. However, the presence of recalcitrant carbon compounds in straw slow its decomposition rate. The objective of this study was to determine the effects of different nitrogen sources, with and without the application of zinc, on straw decomposition and soil quality. Soils were treated with three different nitrogen sources, with and without zinc: urea (CO(NH2)2), ammonium sulfate ((NH4)2SO4), and ammonium chloride (NH4Cl). The combined treatments were as follows: maize (M) and wheat (W) straw incorporated into urea-, ammonium sulfate-, or ammonium chloride-treated soil (U, S, and C, respectively) with and without zinc (Z) (MU, MUZ, WU, WUZ; MS, MSZ, WS, WSZ; MC, MCZ, WC, WCZ, respectively); straw with zinc only (MZ, WZ); straw with untreated soil (MS, WS); and soil-only or control conditions (NT). The experiment consisted of 17 treatments with four replications. Each pot contained 150 g soil and 1.125 g straw, had a moisture content of 80% of the field capacity, and was incubated for 53 days at 25°C. The rates of CO2-C emission, cumulative CO2-C evolution, total CO2 production in the soils of different treatments were measured to infer decomposition rates. The total organic carbon (TOC), labile organic carbon (LOC), and soil microbial biomass in the soils of different treatments were measured to infer soil quality. All results were significantly different (P<0.05) with the exception of the labile organic carbon (LOC). The maize and wheat straw showed different patterns in CO2 evolution rates. For both straw types, Zn had a synergic effect with U, but an antagonistic effect with the other N sources as determined by the total CO2 produced. The MUZ treatment showed the highest decomposition rate and cumulative CO2 concentration (1 120.29 mg/pot), whereas the WACZ treatment had the lowest cumulative CO2 concentration (1 040.57 mg/pot). The addition of NH4Cl resulted in the highest total organic carbon (TOC) concentration (11.59 mg kg-1). The incorporation of wheat straw resulted in higher microbial biomass accumulation in soils relative to that of the maize straw application. The results demonstrate that mineral N sources can affect the ability of microorganisms to decompose straw, as well as the soil carbon concentrations.

Key words: nitrogen sources , zinc , carbon fractions , straw mineralization , wheat straw , maize straw , LOC