干旱区生态环境知识资源中心(Arid): 脉冲式降水对不同类型草地土壤微生物呼吸碳释放量的影响

Arid

	脉冲式降水对不同类型草地土壤微生物呼吸碳释放量的影响
其他题名	Effects of precipitation pulse on soil carbon released by microbes in different grasslands
	徐敏; 边红枫; 徐丽; 陈智; 何念鹏
来源期刊	生态学报
ISSN	1000-0933
出版年	2020
卷号	40 期号:5 页码:1562-1571
中文摘要	降水事件引起土壤短时间内释放大量CO_2的现象常称为降水脉冲效应。降水事件发生后,由于水分和养分可获得性快速提升使土壤微生物呼吸速率快速升高至正常水分状况的数倍,从而导致土壤CO_2大量释放并一定程度上影响着生态系统碳循环过程和土壤碳平衡,尤其在干旱或半干旱地区。利用自主研发的能快速测定土壤微生物呼吸速率的装置,对内蒙古三类典型草原(草甸草原、典型草原和荒漠草原)土壤分别开展土壤复湿实验(60%饱和含水量),并采用高频测定(48 h测定288次)。在土壤复湿后在所有温带草地类型中均发生了明显的脉冲效应,降水脉冲过程中单位有机质(土壤有机碳,SOC)最大呼吸速率(R_(SOC-max))整体表现为荒漠草原(1.59 mg C g~(-1)SOC h-1)>草甸草原(0.73 mg C g~(-1)SOC h-1)>典型草原(0.50 mg C g~(-1)SOC h-1);而脉冲效应的持续时间(Duration)则表现为典型草原(2.5 h)>草甸草原(1.5 h)>荒漠草原(0.67 h)。在土壤复湿48 h内,单位土壤微生物呼吸累积量(A_R_(Soil))的大小规律与单位土壤微生物呼吸速率R_(Soil)一致,均为典型草原>草甸草原>荒漠草原;然而,如果用土壤有机质进行标准化,单位有机质呼吸累积量A_R_(SOC)表现为荒漠草原(9.74 mg C g~(-1)SOC)>典型草原(6.54 mg C g~(-1)SOC)>草甸草原(3.54 mg C g~(-1)SOC),与当地年降雨频率呈负相关关系,表明降水脉冲效应与土壤长期经历的干旱状况存在密切关系。本研究结果不仅证明在干旱半干旱区域降水脉冲效应的普遍性,同时还启发我们应从国家或区域尺度开展研究,以进一步揭示土壤基质含量、土壤干旱状况等对降水脉冲效应的影响。
英文摘要	The phenomena that precipitation events cause a large amount of CO_2 release from the surface soil in a short time is also known as the Birch Effect. The respiration rate of soil microbes can increase rapidly within a few minutes of precipitation. The significant effects on soil carbon emission may affect the soil carbon cycle process of the terrestrial ecosystems,especially in arid and semi-arid regions. In order to explore the effects of precipitation pulse on grassland soils,we conducted a simulated precipitation to test soil microbial respiration rate RS in three typical grassland types(meadow grassland,typical grassland,and desert grassland)in Inner Mongolia,China,by using a self-developed high-intensity measurement system(288 measurements within 48 h). The results showed that,in all three grassland soils,the pulse in the microbial respiration per gram of soil organic carbon(SOC,R_(SOC))peaked within 10 min of the simulated precipitation. The maximum R_(SOC)(R_(SOC-max))was significantly high in desert grassland(1.59 mg C g~(-1)h-1),followed by meadow grassland(0.73 mg C g~(-1)h-1)and typical grassland(0.50 mg C g~(-1)h-1). Furthermore,the accumulative microbial respiration per gram of soil(A_R_(Soil))was similar to the microbial respiration per gram of soil(R_(Soil)). Both were the highest in typical grassland,followed by meadow grassland and desert grassland. If it was standardized by SOC,the accumulative microbial respiration per gram of SOC(A_R_(SOC))was the highest in desert grassland(9.74 mg C g~(-1)),then meadow grassland(6.54 mg C g~(-1)),and the lowest in typical grassland(3.54 mg C g~(-1)).This indicates that the soil respiration response to pulse precipitation is closely related to the degree of drought. Our findings demonstrated the importance of precipitation pulse on soil carbon cycles. Therefore,future studies should consider the effects of soil substrate and initial soil water content.
中文关键词	降水 ; 脉冲效应 ; 土壤有机质 ; 分解 ; 干旱区 ; 草原
英文关键词	precipitation pulse effect soil organic matter decomposition arid area grassland
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Agriculture
WOS研究方向	Agriculture
CSCD记录号	CSCD:6683778
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318371
作者单位	徐敏, 东北师范大学环境学院, 国家环境保护湿地生态与植被恢复重点实验室, 长春, 吉林 130024, 中国.; 边红枫, 东北师范大学环境学院, 国家环境保护湿地生态与植被恢复重点实验室, 长春, 吉林 130024, 中国.; 徐丽, 中国科学院生态系统网络观测与模拟重点实验室, 中国科学院生态系统网络观测与模拟重点实验室, 北京 100101, 中国.; 陈智, 中国科学院生态系统网络观测与模拟重点实验室, 中国科学院生态系统网络观测与模拟重点实验室, 北京 100101, 中国.; 何念鹏, 中国科学院生态系统网络观测与模拟重点实验室;;中国科学院大学资源与环境学院, 中国科学院生态系统网络观测与模拟重点实验室;;, ;;, 北京;;北京 100101;;100049, 中国.
推荐引用方式 GB/T 7714	徐敏,边红枫,徐丽,等. 脉冲式降水对不同类型草地土壤微生物呼吸碳释放量的影响[J],2020,40(5):1562-1571.
APA	徐敏,边红枫,徐丽,陈智,&何念鹏.(2020).脉冲式降水对不同类型草地土壤微生物呼吸碳释放量的影响.生态学报,40(5),1562-1571.
MLA	徐敏,et al."脉冲式降水对不同类型草地土壤微生物呼吸碳释放量的影响".生态学报 40.5(2020):1562-1571.