| Cite this article: | 陈盛,黄达,章二子,等.秸秆隔层还田及水氮管理对土壤无机氮量及酶活性的影响[J].灌溉排水学报,0,():-. |
| Chen Sheng,Huang Da,Zhang Erzi,et al.秸秆隔层还田及水氮管理对土壤无机氮量及酶活性的影响[J].灌溉排水学报,0,():-. |
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| Effects of Straw Interlayer Returning and Water and Nitrogen Management on Soil Inorganic Nitrogen Content and Enzyme Activities |
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Chen Sheng1, Huang Da1, Zhang Erzi2, Zhu Jianbin1, Guo Xiangping1
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1.Hohai university;2.Nanjing Jiangning Water Authority
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| Abstract: |
| 【Objective】Straw is a valuable biomass energy resource in agricultural ecosystem, which is rich in total resources and has great potential for utilization.The buried depth of straw isolation layer and the optimal combination of water and nitrogen were studied to provide theoretical support and application basis for efficient utilization of straw returning to field.【Method】The effects of soil inorganic nitrogen and enzyme activities at different growth stages of tomato were studied under different straw burial depth (surface covering, burial depth 20 cm, burial depth 30 cm) with different irrigation amount (80%Iw, Iw , 120%Iw) and different nitrogen application rate (180 kg/hm2, 225 kg/hm2, 270 kg/hm2) by plot experiment，and the changes and effects of straw burial depth, irrigation amount and nitrogen fertilizer amount on the contents of NH4+-N and NO3--N and the activities of urease, sucrase and catalase in soil were compared and analyzed.【Result】The contents of NH4+-N and NO3--N in the upper soil decreased significantly with time (P < 0.05), while the contents of NH4+-N and NO3--N in the the lower soil increased significantly with time (P < 0.05);The urease activity in the upper soil was firstly significantly decreased and then significantly increased with time (P < 0.05), while the urease activity in the the lower soil was firstly unchanged and then significantly increased with time (P < 0.05);The sucrase activity in the upper and lower soil showed a significant downward trend (P < 0.05);There was no significant change in catalase activity in the upper and lower soil layers (P > 0.05);Nitrogen application rate and straw burial depth significantly affected the contents of ammonium and nitrate nitrogen in the upper soil (P < 0.05), and high nitrogen application rate and straw burial depth of 20 cm significantly increased the contents of ammonium and nitrate nitrogen in the upper soil (P < 0.05);The amount of irrigation had a significant effect on the contents of NH4+-N and NO3--N in the lower soil (P < 0.05),and increasing the amount of irrigation was beneficial to the transport of NH4+-N and NO3--N from the upper soil to the lower soil;The buried depth of straw had significant effects on the activities of urease, sucrase and catalase in the upper and lower soil (P < 0.05), and the buried depth of straw 20 cm could effectively improve the activities of urease, sucrase and catalase in the upper and lower soil.【Conclusion】Straw burial depth of 20cm had better effect on water and fertilizer conservation.Considering soil inorganic nitrogen content, enzyme activity, crop growth characteristics and water saving requirements, straw burial depth 20 cm, irrigation amount 80%IW and nitrogen application amount 270 kg/hm2 was the optimal combination under the current water and fertilizer management mode. |
| Key words: Straw interlayer returning; NH4+-N;NO3--N;Urease;Sucrase;Catalase |
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