干旱区生态环境知识资源中心(Arid): 干旱区不同种植年限苜蓿人工草地土壤CO

Arid

	干旱区不同种植年限苜蓿人工草地土壤CO_2排放的主要影响因素
其他题名	Main factors controlling soil CO_2 efflux from alfalfa fields of different standing ages in an arid region
	徐坤 1; 吴旭东 2; 谢应忠 1; 杨菁 2
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2013
卷号	22 期号:10 页码:1671-1677
中文摘要	采用静态箱-气象色谱法对干旱区不同种植年限苜蓿人工草地土壤系统、土壤-植被系统的CO_2排放通量进行了测定,并对土壤CO_2排放通量的主要影响因素,包括土壤碳氮质量分数、土壤温度、气温、土壤水分体积分数、生物量进行了测定分析,从而得到了苜蓿生长季内CO_2排放通量规律及影响土壤CO2排放的主要因素。结果表明:观测期内各个年限土壤-植被系统与土壤系统的CO_2排放趋势基本一致,总体表现为4 a>5 a>8 a>3 a>1 a,表现出"夏季高秋季低"的季节变化规律,具有明显的季节变化动态,各样地CO_2通量在7月中旬达到最高排放通量;土壤CO2排放通量与0~20 cm土层内土壤有机碳质量分数、活性有机碳质量分数、土壤C:N及土壤全N质量分数都具有正相关关系,并且都达到了显著水平;土壤CO_2排放通量与5 cm土壤温度和大气温度都有正相关关系,并且显著水平很高(P<0.001);土壤CO2排放通量与0~10 cm土壤水分体积分数之间没有显著的相关性(P>0.05);土壤CO_2排放通量与地上部分生物量的大小有直接的正相关关系,并且CO_2排放通量与地上生物量具有相同的变化趋势。
英文摘要	In order to study its dynamic characteristics and the main influencing factors, CO_2 emission fluxes both from soil and from soil-vegetation system were measured in alfalfa stands of various stand ages by using static chamber-GC technique in the meanwhile, the environmental factors such as the contents of soil carbon and nitrogen, soil temperature, air temperature, soil water content and aboveground biomass were also determined in the field. The same age pattern of CO_2 emission flux was observed in soil-vegetation system and in soil system, that was: 4 a>5 a>8 a>3 a>1 a. The value of CO_2 emission flux in summer was higher than that of in autumn, suggested that the seasonality was apparent. The maximum CO_2 emission flux in each sample plot appeared in mid-July. The CO_2 emission flux was positively correlated with soil organic carbon content, soil active organic carbon, soil C/N Ratio and soil total nitrogen of the depth 0-20 cm, and all tests reached statistical significance. The CO_2 emission flux was also positively correlated with 0-5cm soil temperature and air temperature (P<0.001). No significant correlation between the CO_2 emission flux and the 0-10 cm soil water content was observed was observed. The CO_2 emission flux was positively correlated with the aboveground biomass, to be exact, they showed the same trend.
中文关键词	干旱区 ; 种植年限 ; 苜蓿人工草地 ; CO_2排放 ; 主要因素
英文关键词	arid region standing ages alfalfa stands CO_2 emission main factors
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:4998901
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229962
作者单位	1.宁夏大学, 西北土地退化与生态恢复国家重点实验室培育基地, 银川, 宁夏 750021, 中国; 2.宁夏大学西部生态与生物资源开发联合研究中心, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	徐坤,吴旭东,谢应忠,等. 干旱区不同种植年限苜蓿人工草地土壤CO_2排放的主要影响因素[J]. 宁夏大学,2013,22(10):1671-1677.
APA	徐坤,吴旭东,谢应忠,&杨菁.(2013).干旱区不同种植年限苜蓿人工草地土壤CO_2排放的主要影响因素.生态环境学报,22(10),1671-1677.
MLA	徐坤,et al."干旱区不同种植年限苜蓿人工草地土壤CO_2排放的主要影响因素".生态环境学报 22.10(2013):1671-1677.