Impacts of Grazing Livestock Dung and Urine Returning on N2O Emission from Seasonal Freeze-thaw Alpine Steppe

doi:10.11733/j.issn.1007-0435.2024.06.020

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (6): 1843-1855.DOI: 10.11733/j.issn.1007-0435.2024.06.020

Impacts of Grazing Livestock Dung and Urine Returning on N₂O Emission from Seasonal Freeze-thaw Alpine Steppe

XIONG Zhao-yang¹, ZHANG Qing-song^1,2, LI Jia-xiu¹, DU Jing¹, CAO Ying¹, ZHANG Xue¹, WANG Shuang¹, DU Zi-yin^1,3

1. School of Geographical Sciences, China West Normal University, Nanchong, Sichuan Province 637009, China;
2. Sichuan Jintang Experimental Middle School, Chengdu, Sichuan Province 610400, China;
3. Xainza Alpine Steppe and Wetland Ecosystem Observation Station, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan Province 610299, China

Received:2023-10-29 Revised:2024-02-01 Published:2024-06-29

放牧牲畜粪尿返还对季节性冻融高寒草原N₂O排放的影响

熊朝阳¹, 张青松^1,2, 李佳秀¹, 杜静¹, 曹颖¹, 张雪¹, 汪爽¹, 杜子银^1,3

1. 西华师范大学地理科学学院, 四川南充 637009;
2. 四川省金堂实验中学, 四川成都 610400;
3. 中国科学院、水利部成都山地灾害与环境研究所, 中国科学院申扎高寒草原与湿地生态系统观测试验站, 四川成都 610299

通讯作者: 杜子银,E-mail:duzy@cwnu.edu.cn
作者简介:熊朝阳(1999-)，男，汉族，陕西西安人，硕士研究生，主要从事高寒草地生态环境研究，E-mail：xzy15665106602@163.com
基金资助:
四川省自然科学基金项目(2023 NSFSC0205)；第二次青藏高原综合科学考察研究项目(2019QZKK0404)；国家自然科学基金项目(41807109)；西华师范大学科研创新团队项目(KCXTD2023-6)资助

Abstract

Abstract: Grazing livestock dung and urine patches are hotspots of nitrous oxide (N₂O) emissions from grasslands ecosystem. Seasonal freeze-thaw can affect the dung and urine nutrient returning efficiency,alter soil properties,and therefore result in complicated properties and functional mechanism of soil N₂O emission. In order to explore the aforementioned issue,this study conducted a one-year field experiment in Xainza Alpine Steppe and Wetland Ecosystem Observation Station of Chinese Academy of Sciences using the method of static box gas chromatography. Field experiment included treatments of yak and Tibetan sheep dung and urine application and was to investigate the soil nitrogen dynamics,N₂O fluxes,and possible mechanisms influenced by dung and urine deposition in seasonal freeze-thaw alpine steppe of northern Tibet. The results showed that:(1) Urine application had a stronger short-term stimulating effect on soil N₂O emission,with all of urine treatments,showing the highest N₂O fluxes on the first day of urine application. (2) Yak dung and urine application significantly increased soil mineral nitrogen concentration,and the cumulative N₂O emissions from yak dung and yak urine treatments were significantly higher than those from Tibetan sheep dung and Tibetan sheep urine treatments. (3) Cumulative N₂O emissions from each treatment during the freeze-thaw period accounted for 29.3%~42.4% of the total emissions through the whole experimental period,and the thawing period had the greatest contribution to the non-growing season. The conclusions of this study will provide theoretical reference for optimizing the livestock excrement management model and reducing greenhouse gas emission in seasonal freeze-thaw alpine grasslands.

Key words: Freeze-thaw action, Dung degradation, Nitrification and denitrification, N₂O emissions, Alpine steppe, Northern Tibetan Plateau

摘要： 放牧牲畜粪尿斑块是草地氧化亚氮(N₂O)排放的热点区域，季节性冻融会不同程度改变粪尿养分返还效率和土壤特性，使粪尿作用下的土壤N₂O排放特性复杂且作用机理尚不明确。本文采用静态箱-气相色谱法开展为期1年的野外控制试验，探究牦牛和藏绵羊粪尿处理对季节性冻融藏北高寒草原土壤氮动态及N₂O排放通量的影响和可能的作用机制。结果表明：尿液施加对土壤N₂O排放的短期促进作用明显，且均在处理第1天达到排放通量峰值；牦牛粪尿施加对土壤矿化氮含量的增加更为突出，且牛粪和牛尿处理N₂O年累积排放量显著高于羊粪和羊尿处理(P＜0.05)；冻融期各处理N₂O累积排放量占全年的比例为29.3%~42.4%，且消融期对非生长季的贡献最大。研究结论有助于为优化牲畜排泄物管理模式和促进季节性冻融高寒草地温室气体减排等提供理论参考。

关键词: 冻融作用, 粪便降解, 硝化反硝化, N₂O排放, 高寒草原, 藏北高原

CLC Number:

S812.2

XIONG Zhao-yang, ZHANG Qing-song, LI Jia-xiu, DU Jing, CAO Ying, ZHANG Xue, WANG Shuang, DU Zi-yin. Impacts of Grazing Livestock Dung and Urine Returning on N₂O Emission from Seasonal Freeze-thaw Alpine Steppe[J]. Acta Agrestia Sinica, 2024, 32(6): 1843-1855.

熊朝阳, 张青松, 李佳秀, 杜静, 曹颖, 张雪, 汪爽, 杜子银. 放牧牲畜粪尿返还对季节性冻融高寒草原N₂O排放的影响[J]. 草地学报, 2024, 32(6): 1843-1855.

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Impacts of Grazing Livestock Dung and Urine Returning on N₂O Emission from Seasonal Freeze-thaw Alpine Steppe

放牧牲畜粪尿返还对季节性冻融高寒草原N₂O排放的影响

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