秸秆还田对热带土壤-水稻种植系统N<sub>2</sub>O排放的影响

doi:10.7668/hbnxb.20192020

摘要/Abstract

摘要： 为研究秸秆还田对热带地区稻田N₂O排放的影响，以不同管理措施下耕作4 a的稻田土壤为基础，通过盆栽试验观察种植水稻后N₂O排放动态变化。试验设置了不施氮对照（CK）、常规施氮（CT）、单施秸秆（ST）和常规施氮+秸秆（CTST）处理。结果表明，各处理N₂O排放通量在-0.23~6.64 mg/（m²·h），主要集中在水稻生育前中期，CTST处理相比于CT处理显著降低了分蘖肥期田面水无机氮浓度（P<0.05），同时减少了N₂O排峰的维持时间；各处理全生育期N₂O累积排放量为0.13~2.85 g/m²，施氮处理显著高于不施氮处理（P<0.05），ST处理与CK处理差异不显著（P>0.05），CTST处理相比于CT处理可减排49.11%（P<0.05）。因此，施用氮肥是N₂O排放增加的主要原因，秸秆还田可显著减少热带土壤-水稻种植系统N₂O排放。

关键词: 秸秆还田, N₂O排放, 热带地区, 水稻种植系统, 田面水

Abstract: In order to study the effects of straw returning on N₂O emission from paddy fields in tropical areas, this study was based on paddy soil cultivated for 4 years under different management measures, and observed the dynamic changes of N₂O emission after rice planting through pot experiment. The experiment set up N free control(CK), conventional N application(CT), only straw application(ST)and conventional N application combined with straw(CTST)treatment. The results showed that N₂O fluxes ranged from-0.23 to 6.64 mg/(m²·h), mainly concentrated in the early and middle stages of rice growth. Compared with CT treatment, CTST treatment, significantly reduced inorganic N concentration in surface water at tillering stages(P<0.05), and reduced the maintenance time of N₂O emission peak. The whole growth period N₂O cumulative emission of each treatment ranged from 0.13 to 2.85 g/m², and the N application treatment was significantly higher than the N free treatment(P<0.05), and there was no significant difference between the ST and CK treatment(P>0.05). Compared with the CT treatment, the CTST treatment could significantly reduce the N₂O emission by 49.11%(P<0.05). Therefore, application of nitrogen fertilizer is the main reason for the increase of N₂O emission, and straw returning can significantly reduce N₂O emission in tropical soil-rice system.

Key words: Straw returning, N₂O emission, Tropical regions, Rice planting system, Surface water

中图分类号:

S511.01
S141

张鹏, 吴佩聪, 单颖, 邹刚华, 丁哲利, 钱永德, 赵凤亮. 秸秆还田对热带土壤-水稻种植系统N₂O排放的影响[J]. 华北农学报, 2021, 36(S1): 260-266. doi: 10.7668/hbnxb.20192020.

ZHANG Peng, WU Peicong, SHAN Ying, ZOU Ganghua, DING Zheli, QIAN Yongde, ZHAO Fengliang. Effects of Straw Returning on N₂O Emission under Tropical Soil-rice Planting System[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(S1): 260-266. doi: 10.7668/hbnxb.20192020.

http://www.hbnxb.net/CN/Y2021/V36/IS1/260

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秸秆还田对热带土壤-水稻种植系统N₂O排放的影响

Effects of Straw Returning on N₂O Emission under Tropical Soil-rice Planting System

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秸秆还田对热带土壤-水稻种植系统N2O排放的影响

Effects of Straw Returning on N2O Emission under Tropical Soil-rice Planting System

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秸秆还田对热带土壤-水稻种植系统N₂O排放的影响

Effects of Straw Returning on N₂O Emission under Tropical Soil-rice Planting System