干旱区生态环境知识资源中心(Arid): 荒漠草原4种典型植物群落夏季土壤呼吸及枯枝落叶分解释放CO

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	荒漠草原4种典型植物群落夏季土壤呼吸及枯枝落叶分解释放CO_2贡献量
其他题名	CO_2-release rate of soil respiration and litter decomposition in summer of four plant communities in desert steppe
	陈林; 李学斌; 王磊; 刘秉儒; 王新云
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2012
卷号	21 期号:4 页码:629-634
中文摘要	采用动态密闭气室分析法测定了沙蒿(Artemisia desertorum)群落、赖草(Leymus secalinus)群落、甘草(Glycyrrhizauralensis)群落和冰草(Agropyron crisatum)群落4种典型荒漠草原植物群落土壤呼吸和枯落物分解的CO_2释放速率(R_(S+L))、土壤呼吸CO_2释放速率(R_S),利用推导法估算得到了枯落物分解的CO_2释放速率(R_L)及其对总释放的贡献。得到了如下结论:(1)4种群落的R_(S+L)差异较大,其平均值大小排序分别为冰草群落>赖草群落>甘草群落>沙蒿群落,且各群落的R_(S+L)在1 d中是不稳定的,均表现为不对称的单峰曲线形式;土壤基础呼吸大小排序分别为冰草群落>甘草群落>赖草群落>沙蒿群落,且土壤基础呼吸高的土壤,其土壤养分状况较好。(2)R_S相对于气温具有时滞性,4个群落的平均值大小为冰草群落>赖草群落>沙蒿群落>甘草群落。(3)R_L平均值大小排序分别为冰草群落>甘草群落>赖草群落>沙蒿群落;对R_(S+L)的贡献率大小排序为甘草群落>冰草群落>沙蒿群落>赖草群落,表明RL值大的,其对R_(S+L)的贡献率不一定大,两者之间不存在正相关关系。不同植物群落枯落物对土壤呼吸的贡献与枯落物量、温度因子的相关关系并未表现出一致性,但与15 cm处的地温相关性最高。夏季RL对R_(S+L)的平均贡献量(以CO_2计)在0.05~0.16 g.m~(-2).h~(-1)之间,平均贡献率在12.88%~35.33%,是大气CO_2的一个重要的排放源。
英文摘要	With dynamic closed air chamber method,this paper studied the soil and litter respiration(R_(S+L)),soil respiration(R_S) in typical desert steppes of the Artemisia desertorum Spreng,Leymus secalinus,Glycyrrhiza uralensis and Agropyron crisatum communities,and then the contribution of the litter decomposition to the total CO_2-release(R_L) were estimated.The results showed that:(1)The average R_(S+L) values of four plant communities were different: Agropyron crisatum > Leymus secalinus > Glycyrrhiza uralensis > Artemisia desertorum.And R_(S+L) of Artemisia desertorum,Leymus secalinus,Glycyrrhiza uralensis and Agropyron crisatum communities was different in one day and all showed an asymmetric daytime pattern.The values of the soil basal respiration were in the following order: Agropyron crisatum > Glycyrrhiza uralensis > Leymus secalinus > Artemisia desertorum.We can see that the higher soil basal respiration,the soil nutrient better.(2)Relatived to temperature,RS had time-lag,and the R_S average values of the four plant communities were in the following order: Agropyron crisatum > Leymus secalinus > Artemisia desertorum > Glycyrrhiza uralensis.(3)The RLaverage values of the four plant communities were in the following order: Agropyron crisatum > Glycyrrhiza uralensis > Artemisia desertorum > Leymus secalinus.And the contribution rates of RL to R_(S+L) were in the following order: Glycyrrhiza uralensis > Agropyron crisatum > Leymus secalinus > Artemisia desertorum.We can see that the RLaverage values and the contribution rates of RL to R_(S+L) had no positive correlation.The correlationship showed inconsistency between contribution rates and litter quality,temperature,but the contribution rates had better correlation in the soil temperature of 15 cm depth.In summer,the contributions of RLto R_(S+L)were from 0.05 to 0.16 g CO_2.m~(-2).h~(-1),and the contribution rates were from 12.88% to 35.33%,we thought that the RLwas one of the most important emissions source to the atmospheric CO_2.
中文关键词	荒漠草原 ; CO_2释放 ; 枯落物分解 ; 贡献
英文关键词	desert steppe CO_2-release rate litter decomposition contribution
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4553510
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/2XILL650/228403
作者单位	宁夏大学, 西北退化生态系统恢复与重建教育部重点实验室;;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
推荐引用方式 GB/T 7714	陈林,李学斌,王磊,等. 荒漠草原4种典型植物群落夏季土壤呼吸及枯枝落叶分解释放CO_2贡献量[J]. 宁夏大学,2012,21(4):629-634.
APA	陈林,李学斌,王磊,刘秉儒,&王新云.(2012).荒漠草原4种典型植物群落夏季土壤呼吸及枯枝落叶分解释放CO_2贡献量.生态环境学报,21(4),629-634.
MLA	陈林,et al."荒漠草原4种典型植物群落夏季土壤呼吸及枯枝落叶分解释放CO_2贡献量".生态环境学报 21.4(2012):629-634.