Response of Carbon Dioxide Emissions to Warming under No-Till and Conventional Till Systems

被引：31

作者：

Hou, Ruixing ^{[1
,2
]}

Ouyang, Zhu ^{[1
,2
]}

Wilson, G. V. ^{[3
]}

Li, Yunsheng ^{[1
,2
]}

Li, Hanxia ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China

[2] Chinese Acad Sci, Yucheng Comprehens Expt Stn, Beijing 100101, Peoples R China

[3] USDA ARS, Natl Sedimentat Lab, Oxford, MS 38655 USA

来源：

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL | 2014年 / 78卷 / 01期

基金：

中国国家自然科学基金;

关键词：

SOIL CO2 EFFLUX; TEMPERATURE SENSITIVITY; ORGANIC-MATTER; PHYSICAL-PROPERTIES; RESIDUE MANAGEMENT; CLIMATE-CHANGE; RESPIRATION; WATER; IMPACTS; SEQUESTRATION;

D O I：

10.2136/sssaj2013.05.0184

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Differences in soil organic carbon (SOC) distribution, water holding capacity, and soil temperature between no-tillage (NT) and conventional tillage (CT) systems can result in different soil CO2 emissions which could affect global warming but few studies have addressed this concern. An open warming experiment was conducted in situ by infrared heating of long-term conservation tillage management plots in North China Plain (NCP) to determine the effects of warming on soil CO2 emissions and the correlation to changes in soil temperature and moisture. This experiment was conducted from February 2010 to June 2012 and included CT and NT plots with and without warming. Warming treatment increased soil temperature by 2.1 and 1.5 degrees C, and decreased volumetric soil-water content by 14 and 10% for CT and NT systems, respectively. Soil CO2 emissions tended to decrease with time in CT while it consistently increased in NT system over the three wheat seasons and two maize seasons under warming. Our results suggest that differences in soil temperature and soil moisture between the two tillage systems could be enlarged with time by warming, and the potential exist for warming to promote more soil CO2 emission under NT relative to CT. There is a need to consider the differences in response to global warming between these two tillage systems to properly assess the benefits of NT to C sequestration.

引用

页码：280 / 289

页数：10

共 45 条

[1] A review of the effects of tillage systems on some soil physical properties, water content, nitrate availability and crops yield in the Argentine Pampas [J].