黄土丘陵区柠条坡地水分空间异质性及其主控因素

doi:10.16843/j.sswc.2020.06.004

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Abstract [Background] The typical shrub species Caragana korshinskii Kom. is widely planted in the vegetation construction, and plays an important role in ecological restoration and soil erosion control in the arid and semi-arid area. [Methods] Four landscape transects including 15-, 25-, and 35-year-old C. korshinskii Kom. plantations with shrub belt and grass belt, and natural grassland (as control) were selected in the loess hilly region. Heterogeneity of soil moisture content at 0-100 cm depths and its main environmental impact factors were analyzed using redundant analysis. [Results] The soil moisture content on the slope of the study area ranged from 3.3% to 21.3%, showing a moderate variation. With increasing plantation years of C. korshinskii Kom., the values and variability of soil moisture content gradually decreased. The slope positions also had significant effects on soil moisture content, which showed an order of lower-slope > top-slope > mid-slope > upper-slope > shoulder-slope. With the increase of the plantation years of C. korshinskii Kom., the differences of soil moisture content between shrub belt and grass belt decreased, and showed positive values at all slope positions except for the top-slope position. Redundant analysis and variance partitioning analysis showed that plantation age and altitude were the main factors affecting soil moisture heterogeneity, followed by slope position, slope, coverage and belt. The explanation variances of soil moisture content by plantation age, altitude, and slope position were 1.9%, 6.1%, and 3.0%, respectively, and the integrated explanation variance by all environmental factors reached 74.4%. [Conclusions] Overall, the plantation of C. korshinskii Kom. in the loess hilly region reduced soil moisture content and its heterogeneity. Therefore, the synergy effects between the plantation ages of C. korshinskii Kom. and topographic factors should be considered for the distribution patterns of soil moisture content during regional vegetation restoration.

Key words： Caragana korshinskii Kom. slope position soil moisture content spatial heterogeneity loess hilly region

Received: 11 August 2020

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S152.7

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	ZHANG Xingxing
	LIU Xiaofang
	ZHAO Yonggang
	DU Yujia
	JIA Jiayu
	REN Zeying

Cite this article:

ZHANG Xingxing,LIU Xiaofang,ZHAO Yonggang, et al. Spatial heterogeneity of soil moisture on slopes of Caragana korshinskii Kom. plantations and its main controlling factors in loess hilly region[J]. SSWC, 2020, 18(6): 24-32.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2020.06.004 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2020/V18/I6/24

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