干旱区生态环境知识资源中心(Arid): 我国西北地区不同类型草原土壤有机质的稳定碳同位素特征研究

Arid

	我国西北地区不同类型草原土壤有机质的稳定碳同位素特征研究
其他题名	A Study on the Characteristics of Soil Stable Carbon Isotope Composition in Different Types of Grassland in Northwest China
	张月鲜; 孙向阳; 张林; 李素艳
来源期刊	土壤通报
ISSN	0564-3945
出版年	2013
卷号	44 期号:2 页码:348-354
中文摘要	以内蒙古、新疆和西藏3个地区为例,对我国西北地区荒漠草原、亚高山草甸、高山草甸和高寒草原土壤有机碳(SOC)含量及其有机质delta~(13)C值进行测定和分析,结果显示:表层土壤SOC含量随海拔升高逐渐增加,具体表现为内蒙古四子王旗荒漠草原<新疆荒漠草原<新疆亚高山草甸<西藏高山草甸<西藏高寒草原;SOC含量随着深度增加急剧减少,减少幅度依次为92.26%、77.9%、77.67%、61.58%和88.55%;内蒙古四子王旗荒漠草原表层土壤有机质delta~(13)C值与优势植被有机质delta~(13)C值极显著相关(r=0.555,P<0.01),分馏程度大于其他地区;各地区土壤有机质delta~(13)C值均随深度的增加而表现出不同程度的富集,其中内蒙古四子王旗和新疆地区delta~(13)C值富集程度相对较高,分别为12.66和16.53,说明这两个地区土壤有机质分解程度相对较高,且气候、植被和土壤发育特性是控制有机质delta~(13)C值分布的主要因素,同时也表明以上地区曾经可能经历过剧烈的气候变化,植被也发生过相应演替。
英文摘要	According to the geographic distribution of grassland in northwest China, soil samples from Inner Mongolia, Xinjiang and Tibet were collected, and the contents of soil organic carbon (SOC) and values of soil stable carbon isotope (delta~(13)C value) were also tested. The results showed that SOC contents of top soil (0 - 3 cm) increased with the increase of elevation; while SOC contents decreased with the increase of soil depth vertically, the variation ranges were 92.26%, 77.9%, 77.67%, 61.58% and 88.55%, respectively; the delta~(13)C values of top soil and the dominant vegetation were significantly correlated with each other in the desert steppe of Inner Mongolia (r = 0.555,P < 0.01), and the fractionation between soil and vegetation was higher than other areas; The delta~(13)C values of different soil profiles increased dramatically with soil depths, and the fractionation of delta~(13)C value in Inner Mongolia and Xinjiang were higher, which were separately 12.66 and 16.53. These results showed that the rate of SOC decomposition was higher in desert steppe of Inner Mongolia and Xinjiang, and the climate, vegetation and characteristics of soil were the main factors which influenced the vertical distribution of delta~(13)C values. Besides, the significant fractionation of delta~(13)C values in these areas also indicated that the climate and vegetation could have changed violently in desertification grassland in northwest China.
中文关键词	草原 ; 土壤有机质 ; delta~(13)C值 ; 气候及植被变迁
英文关键词	Grassland Soil organic carbon delta~(13)C value Climate and vegetation variation
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:4794215
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230241
作者单位	北京林业大学水土保持学院, 北京 100083, 中国
推荐引用方式 GB/T 7714	张月鲜,孙向阳,张林,等. 我国西北地区不同类型草原土壤有机质的稳定碳同位素特征研究[J]. 北京林业大学,2013,44(2):348-354.
APA	张月鲜,孙向阳,张林,&李素艳.(2013).我国西北地区不同类型草原土壤有机质的稳定碳同位素特征研究.土壤通报,44(2),348-354.
MLA	张月鲜,et al."我国西北地区不同类型草原土壤有机质的稳定碳同位素特征研究".土壤通报 44.2(2013):348-354.