| 引用本文: | 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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| 摘要: |
| 【目的】探究黑土区农田田间持水率的空间变异性机制。【方法】利用传统统计学、多重分形和联合多重分形研究了农田田间持水率的空间变异强度，分析了造成田间持水率空间变异性的局部信息，确定了田间持水率与影响因素的多尺度相关性。【结果】研究区域田间持水率具有多重分形特征，随土层深度增加，变异程度先降后增；0~5和10~15 cm土层田间持水率的空间变异性主要由其高值造成，5~10和15~20 cm土层主要由其低值造成；单一尺度上，与田间持水率相关程度最高的影响因素在0~5 cm土层是黏粒量和土壤体积质量，在5~10和10~15 cm土层是粉粒量和黏粒量，在15~20 cm土层是土壤体积质量和粉粒量；多尺度上，与田间持水率相关程度最高的影响因素在0~5、5~10和10~15 cm土层是黏粒量和粉粒量，在15~20 cm土层是土壤体积质量和粉粒量。【结论】黑土区农田田间持水率的空间变异程度为弱变异，田间持水率与影响因素的相关性具有尺度依赖性。 |
| 关键词: 黑土区；田间持水率；空间变异性；多重分形；农田 |
| DOI： |
| 分类号:S152.7 |
| 基金项目:国家自然科学基金重点项目（51439006）、国家自然科学基金项目（51409046）、黑龙江省自然科学基金项目（E2018005） |
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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 |
