干旱区生态环境知识资源中心(Arid): 土壤非保护性有机碳对荒漠草原沙漠化的响应

Arid

	土壤非保护性有机碳对荒漠草原沙漠化的响应
其他题名	Response of unprotected soil organic carbon to desertification in desert grassland
	阎欣; 安慧
来源期刊	生态学报
ISSN	1000-0933
出版年	2018
卷号	38 期号:8 页码:2846-2854
中文摘要	沙化草地的恢复与重建是干旱半干旱区生态建设的重要内容,分析荒漠草原沙漠化过程中土壤非保护性有机碳分配比例的变异规律对于探讨沙化草地恢复机制具有重要的理论价值.以干旱、半干旱地区荒漠草原不同沙化阶段的土壤为研究对象,分析土壤粗颗粒有机碳、细颗粒有机碳、轻组有机碳含量和分配比例的分布特征、土壤非保护性有机碳转化为保护性有机碳的速率.结果表明:荒漠草原发生逆向演替后,土壤细颗粒有碳含量和分配比例表现为固定沙地>荒漠草地>半固定沙地>流动沙地;粗颗粒有机碳含量表现为荒漠草地>半固定沙地>流动沙地>固定沙地,粗颗粒有机碳分配比例表现为流动沙地>半固定沙地>荒漠草地>固定沙地;轻组有机碳含量和分配比例递减.颗粒有机碳、轻组有机碳、土壤有机碳对草地沙漠化的敏感性不同,颗粒有机碳较轻组有机碳和土壤有机碳敏感性强,其中细颗粒有机碳较粗颗粒有机碳敏感性强.随着草地沙漠化程度的增强土壤非保护性有机碳分配比例呈下降趋势,表明草地沙漠化降低土壤质量.荒漠草地退化至流动沙地土壤非保护性有机碳转化为保护性有机碳的速率整体呈上升趋势.
英文摘要	The restoration and reconstruction of desertification grassland in arid and semiarid region are critical constituents of regional ecological construction. Changes of unprotected soil organic carbon in different desertification stages of desert grassland is important in discussing the mechanism of desertification grassland. The characteristics of the content and proportion of coarse particulate organic carbon (CPOC),fine particulate organic carbon (FPOC),light-fraction organic carbon (LFOC) and the rate constant for C transferring from the unprotected to the protected soil pool (k) in different desertification stages of desert grassland in arid and semiarid region were studied. The results demonstrated that during the desertification process of desert grassland,the rank of the content and proportion of FPOC was fixed dunes >grasslands >semi-fixed dunes >mobile dunes,the rank of the CPOC content was grasslands >semi-fixed dunes >mobile dunes >fixed dunes; and the rank of the CPOC proportion was mobile dunes >semi-fixed dunes >grasslands >fixed dunes. The LFOC content and proportion decreased gradually during the desertification process of desert grassland. Particulate organic carbon (POC) was more sensitive to desertification grassland than LFOC and SOC,and FPOC was more sensitive than CPOC, LFOC and SOC. The proportion of unprotected soil organic carbon decreased gradually during the desertification process in desert grassland,which indicated that there was a decrease in soil quality. The rate constant for C transferring from the unprotected to the protected soil pool (k) increased gradually during the desertification process in desert grassland (from grasslands to mobile dunes).
中文关键词	颗粒有机碳 ; 轻组有机碳 ; 非保护性有机碳 ; 沙漠化 ; 荒漠草原
英文关键词	particulate organic carbon light-fraction organic carbon unprotected soil organic carbon desertification desert grassland
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Agriculture
WOS研究方向	Agriculture
CSCD记录号	CSCD:6232307
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/2XILL650/238120
作者单位	阎欣, 宁夏大学, 西北土地退化与生态恢复宁夏省省部共建国家重点实验室培育基地;;西北退化生态系统恢复与重建教育部重点实验室, 银川, 宁夏 750021, 中国.; 安慧, 宁夏大学, 西北土地退化与生态恢复宁夏省省部共建国家重点实验室培育基地;;西北退化生态系统恢复与重建教育部重点实验室, 银川, 宁夏 750021, 中国.
推荐引用方式 GB/T 7714	阎欣,安慧. 土壤非保护性有机碳对荒漠草原沙漠化的响应[J]. 宁夏大学,2018,38(8):2846-2854.
APA	阎欣,&安慧.(2018).土壤非保护性有机碳对荒漠草原沙漠化的响应.生态学报,38(8),2846-2854.
MLA	阎欣,et al."土壤非保护性有机碳对荒漠草原沙漠化的响应".生态学报 38.8(2018):2846-2854.