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植物生态学报 >

2024 , Vol. 48 >Issue 10: 1291 - 1301

DOI: https://doi.org/10.17521/cjpe.2024.0040

研究论文

内蒙古荒漠草原土壤CH4和CO2通量在不同冻融 阶段对增温和氮添加的响应

  • 张学渊 ,
  • 高翠萍 ,
  • 汤靖磊 ,
  • 朱毅 ,
  • 田磊 ,
  • 韩国栋 ,
  • 任海燕
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  • 内蒙古农业大学草原与资源环境学院, 草地资源教育部重点实验室, 内蒙古自治区草地管理与利用重点实验室, 呼和浩特 010011
*任海燕(renhy@imau.edu.cn); ORCID: 0000-0002-2008-9626

收稿日期: 2024-02-04

  录用日期: 2024-06-18

  网络出版日期: 2024-05-10

基金资助

国家重点研发计划(2022YFF1302300);国家自然科学基金(32260301);内蒙古自治区高等学校创新团队发展计划(NMGIRT2403);中央引导地方科技发展资金项目(2022ZY0210)

收起

Responses of soil CH4 and CO2 flux to warming and nitrogen addition during freeze-thaw cycles in a desert steppe of Nei Mongol, China

  • ZHANG Xue-Yuan ,
  • GAO Cui-Ping ,
  • TANG Jing-Lei ,
  • ZHU Yi ,
  • TIAN Lei ,
  • HAN Guo-Dong ,
  • REN Hai-Yan
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  • Key Laboratory of Grassland Resources of the Ministry of Education, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, China

Received date: 2024-02-04

  Accepted date: 2024-06-18

  Online published: 2024-05-10

Supported by

National Key R&D Program of China(2022YFF1302300);National Natural Science Foundation of China(32260301);Program for Innovative Research Team in Universities of Inner Mongolia Autonomous Region(NMGIRT2403);Local Science and Technology Development Fund Guided by the Central Government(2022ZY0210)

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摘要

土壤CH4和CO2通量是全球碳循环的重要组成部分, 是缓解和适应气候变化的关键因素, 然而在不同冻融阶段土壤CH4和CO2通量如何响应气候变暖和氮沉降仍未清楚解析。该研究以内蒙古荒漠草原开展了18年的增温和氮沉降野外控制实验为基础, 使用SF-3500多通道全自动土壤气体通量测量控制系统, 在2021年5月至2022年4月不间断地监测了荒漠草原生态系统土壤CH4和CO2通量的变化。研究结果表明: (1)增温、增温+氮添加显著提高了土壤温度, 氮添加对土壤温度则没有显著影响; 各处理均未改变土壤含水量。(2)荒漠草原土壤CH4全年累积吸收通量为344-471 mg C·m-2。增温延长了秋季冻结期, 并对该时期土壤CH4累积吸收通量的影响有增加趋势, 氮添加和增温+氮添加则趋向于降低土壤CH4吸收通量; 冬季冻结期占全年土壤CH4吸收通量的比例为8%, 处理间差异不显著; 春季解冻期对全年土壤CH4吸收通量的贡献为14%, 氮添加、增温+氮添加显著降低了该时期土壤CH4吸收通量。(3)荒漠草原CO2全年累积排放通量为101-106 g C·m-2; 秋季冻结期排放通量占全年土壤CO2排放通量的比例为5%, 氮添加、增温、增温+氮添加均趋于增加土壤CO2累积排放通量; 土壤CO2通量在冬季冻结期有从排放转变为吸收的趋势; 增温、增温+氮添加在春季解冻期显著增加了土壤CO2排放通量。(4)土壤CH4吸收通量和CO2排放通量与土壤温度和含水量呈显著正相关关系。研究结果揭示荒漠草原土壤CH4通量表现为“碳汇”, 特别在非生长季的土壤CH4累积吸收通量对全年的贡献达到41%; 土壤CO2全年累积通量以排放为主, 非生长季占全年土壤CO2通量的比例为9%。未来应同时考虑生长季和非生长季的碳通量格局, 以更精准地评估全球变化对陆地生态系统碳固持的影响。

关键词： 荒漠草原; 气候变暖; 氮沉降; 冻融循环; 土壤CH4吸收; 土壤CO2排放

本文引用格式

张学渊 , 高翠萍 , 汤靖磊 , 朱毅 , 田磊 , 韩国栋 , 任海燕 . 内蒙古荒漠草原土壤CH4和CO2通量在不同冻融 阶段对增温和氮添加的响应[J]. 植物生态学报, 2024 , 48(10) : 1291 -1301 . DOI: 10.17521/cjpe.2024.0040

Abstract

Aims Soil CH4 and CO2 fluxes, as key components of global carbon cycle, have a central role in mitigating and adapting to climate change. However, how soil CH4 and CO2 fluxes respond to climate warming and nitrogen (N) deposition during freeze-thaw cycles remain poorly understood.

Methods Here we investigated the effects of long-term (18 years) warming and N addition on soil CH4 and CO2 fluxes continuously during freeze-thaw cycles in a desert steppe of Nei Mongol used the SF-3500 multi-channel automatic soil gas flux measurement and control system from May 2021 to April 2022.

Important findings We found that warming, but not N addition, increased soil temperature. Warming and N addition did not change soil moisture. Annual cumulative CH4 uptake flux ranged from 344 to 471 mg C·m-2 in this desert steppe. Warming prolonged the duration of autumn freeze and increased soil cumulative CH4 uptake flux, whereas N addition and warming plus N addition decreased CH4 uptake during this period. On average, soil CH4 uptake flux during the frozen winter period contributed to 8% of the annual total flux and no significant differences among different treatments. The contribution of soil CH4 uptake during the spring thaw to annual total flux was 14%, and did not be changed by the warming and N addition treatments. Annual cumulative CO2emission flux ranged from 101 to 106 g C·m-2 in this desert steppe. Soil CO2 emission flux during the autumn freeze period contributed most to non-growing season flux, and it tended to increase with warming and N addition. In particular, soil CO2 flux shifted from emission to absorption during the frozen winter period. Both warming and warming plus N addition significantly increased CO2 emission flux during the spring thaw. Overall, soil CO2 flux during the non-growing season contributed to 9% of the annual total CO2flux. Soil CH4 absorption and soil CO2emission were significantly correlated with soil temperature and moisture. Our results indicate that the desert steppe ecosystem acted as CH4 uptake and CO2 emission throughout the whole year, which help to understand the response, strength and direction of carbon source-sink under global change scenarios.

Key words： desert grassland; climate warming; nitrogen deposition; freeze-thaw circles; soil CH4 uptake; soil CO2 emission

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