降雨引起的干湿交替对土壤呼吸的影响:进展与展望
其他题名Effects of drying-wetting cycle caused by rainfall on soil respiration: Progress and prospect
李新鸽; 韩广轩; 朱连奇; 陈超男
发表期刊生态学杂志
ISSN1000-4890
2018-11-12
卷号38期号:2页码:567-575
关键词土壤呼吸土壤水分降雨引起的干湿交替土壤水分饱和或积水soil respirationsoil moisturedrying-wetting cyclesoil water saturation
研究领域环境生态
DOI10.13292/j.1000-4890.201902.006
产权排序(1)河南大学环境与规划学院; (2)中国科学院烟台海岸带研究所中国科学院海岸带环境过程与生态修复重点实验室
作者部门海岸带环境过程实验室
英文摘要Soil respiration is an important part of the carbon cycle in terrestrial ecosystems. The changes of soil respiration caused by rainfall directly affect global carbon balance. Therefore, it is important to explore the mechanism underlying the effects of rainfall on soil respiration, which is necessary for understanding the carbon cycle and carbon budget of terrestrial ecosystems. Here, we summarized the research progress on the mechanism of drying-wetting cycle caused by rainfall on soil respiration. Soil respiration can be promoted at intermediate moisture conditions, but suppressed in both wetter and drier conditions. Drying�瞱etting cycles caused by rainfall affect soil respiration by changing soil moisture. On one hand, under the condition of drought, drying�瞱etting cycle caused by rainfall improve soil respiration rate by short�瞭erm replacement of CO2 in soil, increases of soil microbial respiratory substrate, increases of microbial activity, and enhancement of litter decomposition. On the other hand, soils with high moisture could reach saturation more quickly or even be waterlogged after a short period of rainfall. Drying�瞱etting cycle caused by rainfall can significantly suppress soil respiration through restricting the entrance of O2 to the soil, forming an anaerobic environment, and inhibiting microbial and root respiration. In addition, drying�瞱etting cycle caused by rainfall could significantly inhibit root respiration by flooding part of the plant, reducing plant leaf area and photosynthetic products. In order to accurately estimate the interference of soil respiration on carbon budget of terrestrial ecosystems, future studies on the effects of rainfall on soil respiration should focus on three aspects: (1) microbiological response mechanisms underlying the effects of rainfall on soil respiration; (2) differentiating response mechanisms of soil autotrophic respiration and heterotrophic respiration to rainfall; and (3) modeling the effect of rainfall on soil respiration.
中文摘要土壤呼吸是全球陆地生态系统碳循环重要组成部分,降雨作为扰动因子对土壤呼吸动态的改变将直接影响全球碳平衡。探讨降雨对土壤呼吸的作用机制是陆地生态系统碳循环和碳收支研究的重要内容。本文综述了近年来国内外****关于降雨引起的干湿交替对土壤呼吸影响机制的研究进展,阐述了土壤水分对土壤呼吸的影响及机理,指出土壤水分在适宜范围内促进土壤呼吸,过高或过低均抑制土壤呼吸,进而概括了降雨引起的干湿交替通过改变土壤水分影响土壤呼吸的作用机制。一方面,干旱条件下,降雨引起的干湿交替主要通过短时间置换土壤中CO_2、增加土壤微生物呼吸底物、提高微生物活性、增强凋落物分解速率等途径提高土壤呼吸速率。另一方面,湿度较高的土壤经过短时间降雨迅速达到水分饱和或积水状态,降雨引发的干湿交替通过限制O_2进入土壤,形成厌氧环境,抑制微生物和根系呼吸。此外,降雨引发的干湿交替还通过地表积水淹没部分植株,降低植物叶面积,减少光合产物,显著抑制根系呼吸。为更准确估算降雨变化影响土壤呼吸对陆地生态系统碳平衡的干扰,提出了未来降雨对土壤呼吸影响研究需重点关注的3个方面:1)降雨对土壤呼吸影响的微生物响应机制;2)区分土壤自养呼吸和异养呼吸对降雨的响应机制;3)降雨对土壤呼吸影响模型研究。
资助机构国家自然科学基金项目#41671089
收录类别CSCD
语种中文
CSCD记录号CSCD:6419480
引用统计

文献类型期刊论文
条目标识符http://ir.yic.ac.cnhttp://ir.yic.ac.cn/handle/133337/24662
专题中科院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
中科院海岸带环境过程与生态修复重点实验室

作者单位1.河南大学环境与规划学院;
2.中国科学院烟台海岸带研究所中国科学院海岸带环境过程与生态修复重点实验室

推荐引用方式
GB/T 7714李新鸽,韩广轩,朱连奇,等. 降雨引起的干湿交替对土壤呼吸的影响:进展与展望[J]. 生态学杂志,2018,38(2):567-575.
APA李新鸽,韩广轩,朱连奇,&陈超男.(2018).降雨引起的干湿交替对土壤呼吸的影响:进展与展望.生态学杂志,38(2),567-575.
MLA李新鸽,et al."降雨引起的干湿交替对土壤呼吸的影响:进展与展望".生态学杂志 38.2(2018):567-575.


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