干旱区生态环境知识资源中心(Arid): 沙漠化对科尔沁沙质草地生态系统碳氮储量的影响

Arid

	沙漠化对科尔沁沙质草地生态系统碳氮储量的影响
其他题名	Effects of desertification on C and N storages in grassland ecosystem on Horqin sandy land
	赵哈林1 ; 李玉强 1; 周瑞莲 2
ISSN	1001-9332
出版年	2007
卷号	18 期号:11 页码:2412-2417
中文摘要	通过野外调查,研究了沙漠化对科尔沁沙质草地生态系统碳、氮储量的影响.结果表明:沙漠化对草地碳、氮含量和储量具有显著影响,随着草地沙漠化的进程,草地碳、氮含量和储量明显下降.与非沙漠化草地相比,轻度、中度、重度和严重沙漠化草地0～100 cm深土壤有机碳和全氮含量分别下降了56.06%和48.72%、78.43%和74.36%、88.95%和84.62%、91.64%和84.62%,植物组分中的碳、氮含量分别下降了8.61%和6.43%、0.05%和25.71%、2.58%和27.14%、8.61%和27.86%;轻度、中度、重度和严重沙漠化草地地上植物组分中的碳、氮储量分别下降了25.08%和27.62%、30.90%和46.55%、73.84%和80.62%、90.89%和87.31%,0～100 cm深地下植物组分中碳和全氮储量分别下降了50.95%和43.38%、75.19%和71.04%、86.76%和81.48%、91.17%和83.17%.2000年科尔沁沙地沙漠化草地总面积为30 152.7 km~2,因沙漠化损失的碳、氮总储量高达107.53和9.97 Mt.草地碳、氮含量的下降主要源于风蚀过程中土壤细颗粒的损失.土壤的粗化和贫瘠化最终导致了植物和凋落物中碳、氮储量的明显下降.
英文摘要	Sandy grassland is widespread in northern China,where desertification is very common because of overgrazing and estrepement.However,little is known about the effects of desertification on grassland C and N storages in this region.A field survey was conducted on Horqin sandy grassland,and desertification gradients were established to evaluate the effects of desertification on C and N storages in soil,plant,and litter.The results showed that desertification had deep effects on the contents and storages of grassland C and N.The C and N contents and storages in the grassland decreased significantly with increasing desertification degree.Comparing with those in un-desertified grassland,the C and N contents in lightly,moderately,heavily,and severely desertified grasslands decreased by 56.06% and 48.72%,78.43% and 74.36%,88.95% and 84.62%,and 91.64% and 84.62% in 0-100 cm soil layer,and by 8.61% and 6.43%,0.05% and 25.71%,2.58% and 27.14%,and 8.61% and 27.86% in plant components,respectively.Relevantly,the C and N storages decreased by 50.95% and 43.38%,75.19% and 71.04%,86.76% and 81.48%,and 91.17% and 83.17% in plant underground components in 0-100 cm soil layer,and by 25.08% and 27.62%,30.90% and 46.55%,73.84% and 80.62%,and 90.89% and 87.31% in plant aboveground components,respectively.In 2000,the total area of desertified grassland in Horqin sandy land was 30152.7 km~2,and the C and N loss via desertification reached up to 107.53 and 9.97 Mt,respectively.Correlation analysis indicated that the decrease of soil C and N contents was mainly come from the decreased soil fine particles caused by wind erosion in the process of desertification,and the degradation of soil texture-and nutrient status led finally to the rapid decrease of C and N storages in plant biomass and litter.
中文关键词	干旱半干旱区 ; 沙质草地 ; 沙漠化 ; 碳氮储量 ; 损失量
英文关键词	arid and semiarid area sandy grassland desertification C and N storages loss amount
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3005065
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/221694
作者单位	1.中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国; 2.鲁东大学生命学院, 烟台, 山东 264025, 中国
推荐引用方式 GB/T 7714	赵哈林,李玉强,周瑞莲. 沙漠化对科尔沁沙质草地生态系统碳氮储量的影响[J]. 中国科学院西北生态环境资源研究院,2007,18(11):2412-2417.
APA	赵哈林,李玉强,&周瑞莲.(2007).沙漠化对科尔沁沙质草地生态系统碳氮储量的影响.,18(11),2412-2417.
MLA	赵哈林,et al."沙漠化对科尔沁沙质草地生态系统碳氮储量的影响".18.11(2007):2412-2417.