河北坝上地区坡面尺度土壤机械组成的空间变异

doi:10.16843/j.sswc.2019.05.006

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Abstract [Background] Particle size distribution (PSD) is one of the most important properties of soil, and its spatial variability is important for soil erosion modeling and soil and water conservation planning. Previous studies mainly focused on the spatial variability of PSD at large scales and paid little attention to it at small scales. However, the spatial variability of PSD at small scales is an important and undissolved problem as it can effectively refine soil and water conservation practices. Bashang area is a typical agro-pastoral transition zone with serious soil erosion problem, and the spatial variability of PSD of this area is rarely reported and urgently need to be investigated.[Methods] In this study, PSD at 6 depths (0-5 cm, 5-10 cm, 15-20 cm, 25-30 cm, 40-45 cm and 55-60 cm) from 32 sampling points which were located at different slope types and positions in a slope of Bashang area, Hebei province was determined by pipette method. Spatial variation of PSD was analyzed using geostatistics and spatial interpolation for each depth, and the vertical variation of PSD was also analyzed. Soil texture was determined based on the PSD, and its spatial variability was also investigated. The main influencing factors of the spatial variability of PSD and soil texture at slope scale were discussed.[Results] The results show that the spherical model and Gaussian model could be used to describe the semi-variograms of sand, silt and clay particles at all depths. Most of sand, silt and clay particles at most depths have a strong spatial autocorrelation at this slope scale. The sand particles in convex slope, upper slope and central slope are high, while the silt and clay particles are the opposite. With the increase of soil depth, the sand particles tend to increase, the silt particles tend to decrease, and the clay particles are relatively stable. Furthermore, the spatial variation intensity tends to increase with depth as well. There are totally five soil texture types in the slope including clay loam, silt clay loam, loam, sand clay loam and sandy loam, and the main soil texture is clay loam. The spatial variability of soil texture is strong at convex slope and deep layer. Topographic factors including slope position and slope type affect the intensity of soil erosion and lead to the redistribution of soil particles in the slope. Sand particles are less easily to be eroded, thus they are higher in the convex slope, upper slope and central slope.[Conclusions] Slope position and slope type are the main factors that influence the spatial distribution of PSD at slope scale. The number of soil texture types at slope scale is almost equal to that of large scale, and this verifies the importance of the study on spatial variation of soil texture at small scale. Such studies can provide important information for more reliable soil mapping and more precise land management.

Key words： particle size distribution slope scale spatial variability soil texture Bashang

Received: 23 October 2018

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S152.3

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	ZOU Xinyu
	ZHANG Zhuodong
	WU Mengyao
	WAN Yuanqiang

Cite this article:

ZOU Xinyu,ZHANG Zhuodong,WU Mengyao, et al. Spatial variability of particle size distribution at slope scale in Bashang region of Hebei province[J]. SSWC, 2019, 17(5): 44-53.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.05.006 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I5/44

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