气候变化领域集成服务门户(CCPortal): Variation in soil organic carbon by slope aspect in the middle of the Qilian Mountains in the upper Heihe River Basin, China

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DOI	10.1016/j.catena.2016.07.025
	Variation in soil organic carbon by slope aspect in the middle of the Qilian Mountains in the upper Heihe River Basin, China
	Qin, Yanyan; Feng, Qi; Holden, Nicholas M.; Cao, Jianjun
发表日期	2016
ISSN	0341-8162
EISSN	1872-6887
卷号	147
英文摘要	Topography has an influence on both abiotic (e.g. soil) and biotic (e.g. vegetation) factors influencing soil organic carbon (SOC). In this study, three slope aspects, south-facing, semi-sunny (south-west), and semi-shady (northwest) of mountainous grassland in the middle of the Qilian Mountains were sampled to explore the variation in SOC caused by topography. Soil properties were analyzed at different depths (0-10, 10-20, 20-40, and 4060 cm). The results showed that except soil total organic phosphate, SOC, soil water content, soil bulk density, daily soil temperature, biomass, vegetation cover, and species richness on the semi-shady slope aspect were significantly different to those on two other slope aspects. The SOC, vegetation cover, and biomass significantly increased, from the south-facing to semi-shady slope aspect, and their values on the semi-shady slope aspect were around two times greater than on the south-facing slope aspect The plant community composition also varied by slope aspect, with Agropyron cristatum and Stipa grand's dominant on the south-facing slope aspect, and Agropyron cristatum and Carex aridula dominant on the semi-sunny slope aspect, and Kobresia humilis and Carex crebra dominant on the semi-shady slope aspect. Among all measured abiotic and biotic factors, daily soil temperature, soil bulk density and total soil organic nitrogen could be used to predict SOC, explaining 69.0% of the variation in the data (p < 0.001). On all slope aspects, SOC was greatest in the top 20 cm of soil, representing around 60.0% of the total SOC to 60 cm depth. The results indicated that the distribution of SOC was regulated by slope aspect through its influence on vegetation and soil properties in this region. Therefore, SOC protection measures should be aspect specific. (C) 2016 Elsevier B.V. All rights reserved.
关键词	Topographic factors Abiotic factors Biotic factors Soil properties Mountain grassland
学科领域	Geology; Agriculture; Water Resources
语种	英语
WOS研究方向	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
来源期刊	CATENA
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111874
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm Engn Res Inst, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Qin, Yanyan,Feng, Qi,Holden, Nicholas M.,et al. Variation in soil organic carbon by slope aspect in the middle of the Qilian Mountains in the upper Heihe River Basin, China[J]. 中国科学院西北生态环境资源研究院,2016,147.
APA	Qin, Yanyan,Feng, Qi,Holden, Nicholas M.,&Cao, Jianjun.(2016).Variation in soil organic carbon by slope aspect in the middle of the Qilian Mountains in the upper Heihe River Basin, China.CATENA,147.
MLA	Qin, Yanyan,et al."Variation in soil organic carbon by slope aspect in the middle of the Qilian Mountains in the upper Heihe River Basin, China".CATENA 147(2016).