Effects of Warming and Nitrogen Application on N2O Emission from Swamp Meadow in Gahai Wetland

doi:10.11733/j.issn.1007-0435.2023.05.026

Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (5): 1511-1519.DOI: 10.11733/j.issn.1007-0435.2023.05.026

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Effects of Warming and Nitrogen Application on N₂O Emission from Swamp Meadow in Gahai Wetland

XU Guang-shuai, MA Wei-wei, CHANG Wen-hua, YANG Yong-kai, CHEN Hao

College of Forestry, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China

Received:2022-10-20 Revised:2023-01-26 Online:2023-05-15 Published:2023-05-31

增温施氮对尕海湿地区沼泽草甸N₂O排放的影响

许广帅, 马维伟, 常文华, 杨永凯, 陈好

甘肃农业大学林学院, 甘肃兰州 730070

通讯作者: 马维伟,E-mail:mww-007@163.com
作者简介:许广帅(1998-)，男，汉族，江苏扬州人，硕士研究生，主要从事气候变化背景下高寒湿地生态环境效应的研究，E-mail：787678536@qq.com
基金资助:
甘肃省教育厅：青年博士基金项目(2021QB-024)；甘肃农业大学青年导师基金资助项目(GAU-QDFC-2021-11)；国家自然科学基金项目(31860143)；甘肃省教育厅：产业支撑计划项目(2021CYZC-15)；甘肃省财政专项(GSCZZ-20160909)资助

Abstract

Abstract: To understand the response of nitrous oxide (N₂O) emissions to climate warming and nitrogen deposition in alpine wetland ecosystems,an open top chamber (OTC) warming and exogenous nitrogen addition were used to simulate future climate warming and nitrogen deposition in a swamp meadow in the Gahai wetland region in the Qinghai-Tibet Plateau. Four treatments,namely control (CK),warming (W),nitrogen addition (N),warming plus nitrogen addition (WN),were set up to monitor N₂O emission by using static chamber-gas chromatograph technique under different treatments in the growing season,and explored the relationship between N₂O emissions and environmental factors. The results show that:N₂O emission flux in warming treatment,warming plus nitrogen addition treatment were always above that in the control treatment,average daily N₂O emissions fluxes were respectively higher 22.41% and 56.90%;N₂O cumulative emission fluxes in control,warming,nitrogen addition,warming plus nitrogen addition were 0.87,1.07,1.09,1.37 kg·hm^-2 N,respectively. A brief shift from source to sink of soil N₂O emission flux at the end of the growing season;Pearson correlation analysis showed that N₂O emission flux was significantly negatively correlated with below ground plant biomass (P<0.05),positively correlated with water content and nitratase activity (P<0.05),and highly significantly correlated with temperature,nitrate and ammonium nitrogen (P<0.01). This study might provide a scientific basis for future projections of greenhouse gas emissions from alpine wetland ecosystems under global climate change.

Key words: N₂O emission, Warming, Nitrogen addition, Swamp meadow

摘要： 为深入了解高寒湿地生态系统氧化亚氮(N₂O)排放对气候变暖及氮沉降的响应,以青藏高原尕海湿地区沼泽草甸为研究对象,利用开顶箱(Open top chamber,OTC)增温和外源氮素添加来模拟未来气候变暖以及氮沉降,布设对照(CK),增温(W),施氮(N)和增温+施氮(WN)4种处理,采用静态箱-气相色谱法监测不同处理下植物生长季N₂O 排放,并探究了N₂O 排放与环境因子之间的关系。结果表明:仅W与WN处理的N₂O 排放通量始终高于对照,日均排放通量高出对照组22.41% 和56.90%;WN,N,W和CK处理下N₂O 累计排放量分别为0.87,1.07,1.09和1.37 kg·hm^-2 N;生长季末期土壤N₂O 短暂的由"源"向"汇"转变;N₂O 排放通量与地下生物量显著负相关(P<0.05),与含水量和硝酸酶活性显著正相关(P<0.05),与温度、硝态氮和铵态氮极显著正相关(P<0.01)。本研究可为未来高寒湿地生态系统在全球气候变化下温室气体排放的预测提供科学依据。

关键词: N₂O排放, 增温, 施氮, 沼泽草甸

CLC Number:

S154.2

XU Guang-shuai, MA Wei-wei, CHANG Wen-hua, YANG Yong-kai, CHEN Hao. Effects of Warming and Nitrogen Application on N₂O Emission from Swamp Meadow in Gahai Wetland[J]. Acta Agrestia Sinica, 2023, 31(5): 1511-1519.

许广帅, 马维伟, 常文华, 杨永凯, 陈好. 增温施氮对尕海湿地区沼泽草甸N₂O排放的影响[J]. 草地学报, 2023, 31(5): 1511-1519.

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Effects of Warming and Nitrogen Application on N₂O Emission from Swamp Meadow in Gahai Wetland

增温施氮对尕海湿地区沼泽草甸N₂O排放的影响

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