Spatial distribution of caliche nodules in surface soil and their influencing factors in the Liudaogou catchment of the northern Loess Plateau, China

doi:10.1016/j.geoderma.2018.05.012

	Spatial distribution of caliche nodules in surface soil and their influencing factors in the Liudaogou catchment of the northern Loess Plateau, China
	Gong, Tiexiong 1,2,3; Zhu, Yuanjun 1,2,3; Shao, Ming'an 1,2,3,4
刊名	GEODERMA
	2018-11-01
卷号	329 页码:11-19
关键词	Caliche nodules Slope Vegetation cover Elevation Northern Loess Plateau
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2018.05.012
通讯作者	Zhu, Yuanjun(zhuyj@nwsuaf.edu.cn)
英文摘要	Quantifying the distribution of caliche nodules in a catchment is a basis toward understanding soil erosion and soil degradation as well as soil-water processes in the soil containing caliche nodules. In this study, field surveys and soil sampling were coupled with spatial and statistical analyses along with image processing to investigate the spatial distribution of caliche nodules and their influencing factors in the Liudaogou catchment, the northern Loess Plateau of China. Results showed that more caliche nodules were present at the top of the mountain, mountain ridges, roadsides, edges of ravines, and other high elevation regions, as represented by comparatively higher caliche nodule coverage (CNC, 11.26-18.28%). Caliche nodules were rarely present in low elevation areas such as the terraced cropland and check dam, as represented by lower CNC ( < 2.55%). More than 65% of the total caliche nodules had a diameter of 10-50 mm. The caliche nodule coverage and diameter showed strong spatial dependence. The CNC was significantly related to the slope gradient and vegetation cover (P < 0.01), and the caliche nodule diameter (CND) was significantly related to the elevation (P < 0.01). Two simple models were established to predict the CNC and CND values given the parameters of slope gradient and vegetation cover. The validation of the models showed relatively high accuracy. These findings quantify caliche nodule distribution in a catchment for the first time, and may benefit the assessment of soil erosion and soil degradation in this special soil in the Loess Plateau.
资助项目	National Natural Science Foundation of China[41371242] ; National Natural Science Foundation of China[41530854] ; Key Research Program of the Chinese Academy of Sciences[KFZD-SW-306]
WOS关键词	ROCK-FRAGMENT COVER ; STONY SOILS ; HYDRAULIC CONDUCTIVITY ; PHYSICAL-PROPERTIES ; CULTIVATED SOILS ; WATER-RETENTION ; EROSION ; DEGRADATION ; HILLSLOPES ; FIELDS
WOS研究方向	Agriculture
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000436221200002
资助机构	National Natural Science Foundation of China ; Key Research Program of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/54593]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhu, Yuanjun
作者单位	1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Fanning Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Gong, Tiexiong,Zhu, Yuanjun,Shao, Ming'an. Spatial distribution of caliche nodules in surface soil and their influencing factors in the Liudaogou catchment of the northern Loess Plateau, China[J]. GEODERMA,2018,329:11-19.
APA	Gong, Tiexiong,Zhu, Yuanjun,&Shao, Ming'an.(2018).Spatial distribution of caliche nodules in surface soil and their influencing factors in the Liudaogou catchment of the northern Loess Plateau, China.GEODERMA,329,11-19.
MLA	Gong, Tiexiong,et al."Spatial distribution of caliche nodules in surface soil and their influencing factors in the Liudaogou catchment of the northern Loess Plateau, China".GEODERMA 329(2018):11-19.