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[1]JING Tingting,HU Haitang,QIU Chunxia,et al.Spatial Variability and Its Controlling Topographic Factors of Soil Moisture During Spring Plowing Season in Black Soil Hilly Region of Northeast China[J].Research of Soil and Water Conservation,2022,29(01):58-65.

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Spatial Variability and Its Controlling Topographic Factors of Soil Moisture During Spring Plowing Season in Black Soil Hilly Region of Northeast China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 01 Page number: 58-65 Column: Public date: 2022-02-20

Title:: Spatial Variability and Its Controlling Topographic Factors of Soil Moisture During Spring Plowing Season in Black Soil Hilly Region of Northeast China

Author(s):: JING Tingting^1,2, HU Haitang^2,3, QIU Chunxia¹, LI Cunjun^2,3, ZHOU Jingping^2,3, ZHANG Qiaoling^1,2, BAI Cui^1,2; (1.Xi'an University of Science and Technology, Xi'an 710054, China; 2.Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China; 3.National Engineering Research Center for Intelligent Equipment Technology in Agriculture, Beijing 100097, China)

Keywords:: soil moisture; spatial variation; black soil and hilly area in northeast China; topographic factors; slope position

CLC:: S152.7

DOI:: -

Abstract:: Black soil region of northeast China is an important national commodity grain base. Most of cultivated lands distribute in seasonally frozen hilly regions. The spring hydrothermal condition is the main limiting factor for agricultural production in this region. The spring low-temperature and wet waterlogging are prominent, especially with the thawing of frozen soil and rainy and snowy weather, causing a significant delay in spring plowing and sowing for the agricultural tractor cannot work on the waterlogged field. Soil moisture is affected by topography and geomorphology, soil texture, land use type, vegetation, and other factors on multiple scales, as a central factor of agricultural production and ploughing. To reveal the spatial variability of soil moisture on different scales during spring plowing season in black soil hilly region of northeast China, and the impact of topographic factors, Zhaoguang Farm in Heilongjiang Province was selected as the study area. Soil moisture was retrieved using Sentinel-1 SAR data. The spatial variability of soil moisture on farm scale and field scale, the variation of soil moisture at different slope positions and aspects, and the controlling topographic factors were analyzed by semi-variogram and aggregated boosted trees(ABT)methods. The results showed that: on April 24, 2018, the retrieved soil moisture content varied from 25% to 38%; the coefficient of variation(CV)at field scale(5.81%)was higher than at farm scale(4.16%); the ranges of semi-variograms at farm scale and field scale were 3 000 m and 300 m; the soil moisture was positively and significantly correlated with Topographic Wetness Index(TWI), and negatively and significantly correlated with slope, aspect, elevation and slope position. ABT analysis indicated the combined-scale slope position, slope, and aspect were the main controlling factors affecting the spatial variability of soil moisture. The cumulative relative interpretation rate of these three factors exceeded 70%, of which the combined-scale slope position accounted for 36.28%; the soil moisture content declined with the increasing of the slope position at farm scale and field scale, except the fields on the upland; on each type of aspect, the soil moisture content followed the order: semi-sunny slope> flat>shady slope>semi-shady slope>sunny slope, under the impact of the wind direction. These results can benefit the understanding of soil water distribution regime and the influence mechanism during spring plowing season in black soil hilly region of northeast China, and are valuable for cultivated land water management and agricultural machinery scheduling during spring plowing and sowing season.

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Last Update: 2022-02-20