| Cite this article: | 刘继龙,徐清,李林,等.黑土区农田尺度田间持水率的空间变异性研究[J].灌溉排水学报,0,():-. |
| LIU Jilong,XU Qing,LI Lin,et al.黑土区农田尺度田间持水率的空间变异性研究[J].灌溉排水学报,0,():-. |
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| Spatial Variability of Field Capacity at Farmland Scale in Black Soil Region |
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LIU Jilong1, XU Qing1, LI Lin2, FU Qiang1, WANG Xiaohui1, MA Bosi1, YAN Jiaming1, LIU Haiyue1
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1.School of Water Conservancy and Civil Engineering,Northeast Agricultural University;2.College of Water Conservancy and Architecture Engineering, Tarim University
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| Abstract: |
| 【Background】The soil moisture characteristic has the obvious spatial variability, and the determination of its spatial variability is the theoretical basis for the precision management of soil water. Field capacity is an important soil moisture characteristic parameter, at present, the study on the spatial variability of field capacity is relatively few. Furthermore, the soil degradation in black soil region is serious, the capacity of soil moisture preservation is decreasing, and the spatial variability of field capacity in this region is a scientific problem worthy of discussing. 【Objective】The aim of this work is to explore spatial variability mechanism of field capacity in black soil region.【Method】Spatial variability degree of field capacity, local information causing its spatial variability and multi-scale relationship between it and influencing factors were studied with traditional statistics, multifractal and joint multifractal theories.【Result】Field capacity had multifractal characteristics, and its spatial variability degree first decreased and then increased with the increase of soil layer depth. The local information that caused spatial variability of field capacity was mainly its high value information in 0~5 cm and 10~15 cm soil layers, and was mainly its low value information in 5~10 cm and 15~20 cm soil layers. At the single scale, the most obvious factor that correlated with field capacity was clay content and soil bulk density in 0~5 cm soil layer, was silt content and clay content in 5~10 cm and 10~15 cm soil layers, and was soil bulk density and silt content in 15~20 cm soil layer. At the multi-scale, the most obvious factor that correlated with field capacity was clay content and silt content in 0~5 cm, 5~10 cm and 10~15 cm soil layers, and was soil bulk density and silt content in 15~20 cm soil layer.【Conclusion】Spatial variability degree of field capacity was weak in farmland of black soil region. Relationship between field capacity and influencing factors had scale dependence. |
| Key words: black soil region; field capacity; spatial variability; multifractal; farmland |
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