气候变化领域集成服务门户(CCPortal): Effects of topography on soil organic carbon stocks in grasslands of a semiarid alpine region, northwestern China

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DOI	10.1007/s11368-018-2203-0
	Effects of topography on soil organic carbon stocks in grasslands of a semiarid alpine region, northwestern China
	Zhu, Meng; Feng, Qi; Zhang, Mengxu; Liu, Wei; Qin, Yanyan; Deo, Ravinesh C.; Zhang, Chengqi
发表日期	2019
ISSN	1439-0108
EISSN	1614-7480
卷号	19 期号:4
英文摘要	Purpose Soil organic carbon (SOC) in mountainous regions is characterized by strong topography-induced heterogeneity, which may contribute to large uncertainties in regional SOC stock estimation. However, the quantitative effects of topography on SOC stocks in semiarid alpine grasslands are currently not well understood. Therefore, the purpose of this research study is to determine the role of topography in shaping the spatial patterns of SOC stocks. Materials and methods Soils from the summit, shoulder, backslope, footslope, and toeslope positions along nine toposequences within three elevation-dependent grassland types (i.e., montane desert steppe at similar to 2450m, montane steppe at similar to 2900m, and subalpine meadow at similar to 3350m) are sampled at four depths (0-10, 10-20, 20-40, and 40-60 cm). SOC content, bulk density, soil texture, soil water content, and grassland biomass are determined. The general linear model (GLM) is employed to quantify the effects of topography on the SOC stocks. Ordinary least squares regressions are performed to explore the underlying relationships between SOC stocks and the other edaphic factors. Results and discussion In accordance with the present results, the SOC stocks at 0-60cm show an increasing trend in respect to the elevation zone, with the highest stock being approximately 37.70gm(-2) in the subalpine meadow, about 2.07 and 3.41 times larger than that in the montane steppe and montane desert steppe, respectively. Along the toposequences, it is revealed the SOC stocks are maximal at toeslope, reaching to 14.98, 31.76, and 49.52kgm(-2), which are also significantly larger than those at the shoulder by a factor of 1.38, 2.31, and 1.44, in montane desert steppe, montane steppe, and subalpine meadow, respectively. Topography totally is seen to explain about 84% of the overall variation in SOC stocks, of which 70.61 and 9.74% are attributed to elevation zone and slope position, while the slope aspect and slope gradient are seen to plausibly explain only about 1.84 and 0.01%, respectively. Conclusions The elevation zone and the slope position are seen to markedly shape the spatial patterns of the SOC stocks, and thus, they may be considered as key indicating factors in constructing the optimal SOC estimation model in such semiarid alpine grasslands.
关键词	Elevation Grasslands Semiarid alpine region Slope position Soil organic carbon stocks
学科领域	Environmental Sciences & Ecology; Agriculture
语种	英语
WOS研究方向	Environmental Sciences ; Soil Science
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
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/112087
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Meng,Feng, Qi,Zhang, Mengxu,et al. Effects of topography on soil organic carbon stocks in grasslands of a semiarid alpine region, northwestern China[J]. 中国科学院西北生态环境资源研究院,2019,19(4).
APA	Zhu, Meng.,Feng, Qi.,Zhang, Mengxu.,Liu, Wei.,Qin, Yanyan.,...&Zhang, Chengqi.(2019).Effects of topography on soil organic carbon stocks in grasslands of a semiarid alpine region, northwestern China.JOURNAL OF SOILS AND SEDIMENTS,19(4).
MLA	Zhu, Meng,et al."Effects of topography on soil organic carbon stocks in grasslands of a semiarid alpine region, northwestern China".JOURNAL OF SOILS AND SEDIMENTS 19.4(2019).