干旱区生态环境知识资源中心(Arid): 宁夏荒漠草原自然恢复演替过程中土壤有机碳及其分布的变化

Arid

	宁夏荒漠草原自然恢复演替过程中土壤有机碳及其分布的变化
其他题名	Variations in soil organic carbon content and distribution during natural restoration succession on the desert steppe in Ningxia
	许冬梅 1; 许新忠 2; 王国会 3; 陶利波 3
来源期刊	草业学报
ISSN	1004-5759
出版年	2017
卷号	26 期号:8 页码:35-42
中文摘要	以宁夏荒漠草原自然恢复的围封草地为对象,通过野外调查和室内分析,研究了未封育、封育3、5、7和10年的草地总有机碳及其在土壤剖面和不同粒级团聚体中的分布。结果表明,土壤有机碳含量随封育年限的增加呈波动性增加,除0~5cm土层外,各土层有机碳含量以封育7年、10年的草地较高;就有机碳在不同粒径团聚体中的分布看,0~10cm表层土壤以封育3年及未封育草地各粒级团聚体有机碳含量较高,而10~40cm土层各粒级团聚体有机碳随封育年限的延长呈增加趋势,各土层团聚体有机碳含量均以1~0.5mm与0.5~0.25mm粒级较高;各粒级团聚体对有机碳的贡献率在0~10cm表层以<0.25mm微团聚体最高,10~20cm土层以>5mm粒级和<0.25mm粒级较高,20~40cm土层以>5mm粒级最高。综上所述,封育有利于荒漠草原土壤有机碳的固存,退化荒漠草原生态环境恢复在封育7年时出现转折;随土层的加深,团聚体有机碳贡献率对封育的响应减弱,且大团聚体对全土有机碳的贡献率逐渐增大。
英文摘要	Fencing(enclosure)is one of the strategies used to promote the natural restoration of ecological communities on the desert steppe in Ningxia.To explore the effects of enclosure on soil organic carbon and its distribution, field studies were conducted at sites with 3,5,7,and 10 years of enclosure.Soil samples were collected to determine the total organic carbon concentration and its distribution at different soil depths and in soil aggregates.The results showed that the soil organic carbon concentrations were higher in 7-year and 10-year enclosed grasslands than in those enclosed for shorter times,except at 0-5cm depth.The concentrations of soil organic carbon were lower in the 0-5cm and 5-10cm soil layers than in the 10-20cm and 20-40cm soil layers.The soil organic carbon concentrations in soil aggregate particles at 0-10cm depth were highest in the 3-year enclosed grassland,while those at 10-40cm depth increased with longer enclosure times.The maximum soil organic carbon contents were in aggregates with 1-0.5mm and 0.5-0.25mm diameters.Aggregates of<0.25mm,>5mm or<0.25mm,and>5mm made the largest contributions to soil organic carbon content at 0-10cm depth,10-20cm depth and 20-40cm depth,respectively.The contribution of aggregates to soil organic carbon content decreased with increasing enclosure times.As the soil depth increased,the contribution of aggregates to soil organic carbon content decreased,but the contributions of macroaggregates to soil organic carbon content increased.In conclusion,enclosure was beneficial for carbon sequestration.The restoration of the ecosystem on the degraded desert steppe appeared to undergo a transition at the 7th year of enclosure.
中文关键词	荒漠草原 ; 恢复演替 ; 土壤有机碳 ; 分布
英文关键词	desert steppe restoration succession soil organic carbon distribution
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:6070782
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/2XILL650/235702
作者单位	1.宁夏大学农学院, 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.宁夏大学数学计算机学院, 银川, 宁夏 750021, 中国; 3.宁夏大学农学院, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	许冬梅,许新忠,王国会,等. 宁夏荒漠草原自然恢复演替过程中土壤有机碳及其分布的变化[J]. 宁夏大学,2017,26(8):35-42.
APA	许冬梅,许新忠,王国会,&陶利波.(2017).宁夏荒漠草原自然恢复演替过程中土壤有机碳及其分布的变化.草业学报,26(8),35-42.
MLA	许冬梅,et al."宁夏荒漠草原自然恢复演替过程中土壤有机碳及其分布的变化".草业学报 26.8(2017):35-42.