Soil organic carbon and nitrogen content of density fractions and effect of meadow degradation to soil carbon and nitrogen of fractions in alpine Kobresia meadow

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	Soil organic carbon and nitrogen content of density fractions and effect of meadow degradation to soil carbon and nitrogen of fractions in alpine Kobresia meadow
	Wang WenYing 1; Wang QiJi 2; Lu ZiYu 1
	2009-05-01
发表期刊	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
ISSN	1006-9313
卷号	52 期号:5 页码:660-668
文章类型	Article
摘要	This research was conducted on the non-disturbed native alpine Kobresia meadow (YF) and the severely degraded meadow (SDL) of Dari County of Qinghai Province. By a density fractionation approach, each soil sample was divided into two fractions: light fraction (LF) and heavy fraction (HF). The obtained fractions were analyzed for organic carbon (OC) and nitrogen (N) concentrations. The results showed: (1) the OC concentration in HF and LF was 3.84% and 28.63% respectively while the nitrogen concentration in HF and LF was 0.362% and 1.192% respectively in 0-10 cm depth. C:N ratio was 10.6 in HF and 23.8 in LF respectively. (2) As far as the ratio of OC in given fraction to that in gross sample was concerned, dominance of OC in HF was obvious in the whole soil profile. OC in HF increased from 78.95% to 90.33%, while OC in LF decreased from 21.05% to 9.68% with depths. (3) Soil total OC amounted to 47.47 in YF while 17.63 g center dot kg(-1) in SDL, in which the OC content in HF decreased from 37.31 to 16.01 g center dot kg(-1) while OC content in LF decreased from 10.01 to 1.62 g center dot kg(-1). In other words, results of OC and N content show meadow degradation led to the loss of 57% OC in HF and 84% OC in LF from originally native ecosystem on alpine meadow. In addition, meadow degradation led to the loss of 43% N in HF and 79% N in LF from originally native ecosystem on alpine meadow. (4) The main reason for loss of C and N in LF during meadow degradation was not attributed to the decrease of OC and N concentration in LF and LF, but to the decrease in LF dry weight. Loss of N was far lower than loss of C in HF. This may suggest that there is difference in protection mode of C and N in HF.; This research was conducted on the non-disturbed native alpine Kobresia meadow (YF) and the severely degraded meadow (SDL) of Dari County of Qinghai Province. By a density fractionation approach, each soil sample was divided into two fractions: light fraction (LF) and heavy fraction (HF). The obtained fractions were analyzed for organic carbon (OC) and nitrogen (N) concentrations. The results showed: (1) the OC concentration in HF and LF was 3.84% and 28.63% respectively while the nitrogen concentration in HF and LF was 0.362% and 1.192% respectively in 0-10 cm depth. C:N ratio was 10.6 in HF and 23.8 in LF respectively. (2) As far as the ratio of OC in given fraction to that in gross sample was concerned, dominance of OC in HF was obvious in the whole soil profile. OC in HF increased from 78.95% to 90.33%, while OC in LF decreased from 21.05% to 9.68% with depths. (3) Soil total OC amounted to 47.47 in YF while 17.63 g center dot kg(-1) in SDL, in which the OC content in HF decreased from 37.31 to 16.01 g center dot kg(-1) while OC content in LF decreased from 10.01 to 1.62 g center dot kg(-1). In other words, results of OC and N content show meadow degradation led to the loss of 57% OC in HF and 84% OC in LF from originally native ecosystem on alpine meadow. In addition, meadow degradation led to the loss of 43% N in HF and 79% N in LF from originally native ecosystem on alpine meadow. (4) The main reason for loss of C and N in LF during meadow degradation was not attributed to the decrease of OC and N concentration in LF and LF, but to the decrease in LF dry weight. Loss of N was far lower than loss of C in HF. This may suggest that there is difference in protection mode of C and N in HF.
关键词	Alpine Kobresia Meadow Density Fraction Soil Organic Carbon Soil Nitrogen Meadow Degradation
WOS标题词	Science & Technology ; Physical Sciences
关键词[WOS]	LIGHT-FRACTION ; TIBETAN PLATEAU ; PARTICLE-SIZE ; MATTER ; CULTIVATION ; MANAGEMENT ; VEGETATION ; CHINA
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000265924500009
引用统计	被引频次：26[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1874
专题	中国科学院西北高原生物研究所
作者单位	1.Qinghai Normal Univ, Dept Life Sci, Xining 810008, Peoples R China 2.Chinese Acad Sci, NW Inst Plateau Biol, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Wang WenYing,Wang QiJi,Lu ZiYu. Soil organic carbon and nitrogen content of density fractions and effect of meadow degradation to soil carbon and nitrogen of fractions in alpine Kobresia meadow[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2009,52(5):660-668.
APA	Wang WenYing,Wang QiJi,&Lu ZiYu.(2009).Soil organic carbon and nitrogen content of density fractions and effect of meadow degradation to soil carbon and nitrogen of fractions in alpine Kobresia meadow.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,52(5),660-668.
MLA	Wang WenYing,et al."Soil organic carbon and nitrogen content of density fractions and effect of meadow degradation to soil carbon and nitrogen of fractions in alpine Kobresia meadow".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 52.5(2009):660-668.