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韦 灵,陈晓冰,吴 晗,等. 秸秆覆盖对岩溶区稻田土壤优先路径特征的影响[J]. 科学技术与工程, 2020, 20(29): 11891-11900.
WEI Ling,WU Han,et al.Effect of Straw Mulching on Characteristics of Preferential Flow Paths of Paddy Soils in Karst Area[J].Science Technology and Engineering,2020,20(29):11891-11900.
秸秆覆盖对岩溶区稻田土壤优先路径特征的影响
Effect of Straw Mulching on Characteristics of Preferential Flow Paths of Paddy Soils in Karst Area
投稿时间:2020-02-21  修订日期:2020-06-23
DOI:
中文关键词:  岩溶区  秸秆覆盖 优先路径  空间分布 优先流发育程度
英文关键词:karst area  straw mulching  preferential flow paths  spatial distribution  development degree of preferential flow
基金项目:广西中青年教师基础能力提升项目(2017KY0270)、广西环境污染控制理论与技术重点实验室研究(桂科能1701K009)和桂林理工大学博士科研启动基金(GUTQDJJ2017001)第一作者:韦灵(1992—),女,壮族,广西都安人,硕士研究生。研究方向:生态水利与节水灌溉。E-mail:weiling512706@163.com。*通信作者:陈晓冰(1988—),男,蒙古族,内蒙古赤峰人,博士,讲师。研究方向:土壤水分运动与模拟研究。E-mail:jayvision_chen@126.com。 陈晓冰2,3,4* 吴 晗1 姜 波1 李振东1
              
作者单位
韦 灵 桂林理工大学环境科学与工程学院
陈晓冰 桂林理工大学环境科学与工程学院
吴 晗 桂林理工大学环境科学与工程学院
姜 波 桂林理工大学环境科学与工程学院
李振东 桂林理工大学环境科学与工程学院
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中文摘要:
      为探究秸秆覆盖对桂北岩溶区水稻田土壤优先路径的影响,采用野外染色示踪方法,结合图像形态学解析技术与空间统计分析方法,研究桂北岩溶区秸秆覆盖与非覆盖条件下水稻田优先路径及其空间分布特征。结果表明:随土壤深度的增加,秸秆覆盖条件下的水稻田土壤染色形态呈表层整体分散分布向深层团块状零散分布形态转变,而非秸秆覆盖条件下的土壤染色形态以聚集枝状裂隙为主向两侧团块状分布形态转变,且秸秆覆盖的水稻田平均总染色面积比(18.23%)仅是非秸秆覆盖的0.75倍,二者之间差异显著(P<0.05)。秸秆覆盖条件下水稻田的平均优先路径总数量(6323)仅是非秸秆覆盖条件下的0.81倍,二者优先路径数量均随土壤深度的增加而降低,但覆盖条件下水稻田的优先路径数量下降最快,以4.48倍速减小,其优先路径的平均复杂度为2.11,而非覆盖条件下水稻田优先路径平均复杂度为2.14,二者之间差异性显著(P<0.05),即非秸秆覆盖下的水稻田优先路径扭曲程度更高,表现为路径较集中的空间分布状态,且秸秆覆盖措施影响水稻田优先路径。覆盖措施虽加快了土壤表层水流运动状态,但降低了深层土壤中优先流的发育程度,减少了田间水肥深层渗漏,在一定程度上可提高作物耕作层中的水肥利用率。
英文摘要:
      In order to explore the effect of straw mulching on the preferential flow paths of paddy field in the Karst area of northern Guangxi, the method of field staining and tracer, combined with image morphological analysis and spatial statistical analysis are used to study the priority path and spatial distribution characteristics of straw mulching and non-mulching paddy fields in north karst area of Guangxi. The result show that with the increase of soil depth, the soil staining morphology of paddy fields under the condition of straw mulching is changes from surface scattered distribution to deep dyeing form crumb scattered distribution. However, the staining morphology mainly changes from cluster dendritic fissures to lumpy distribution on both sides of the non-straw mulching conditions in the paddy field, and the average total dyeing area ratio of straw mulching paddy field (18.23%) is only 0.75 times higher than the non-cover conditions paddy field with significant difference (P <0.05).The average total number of preferential flow paths of straw mulching (6323) is only 0.81 times higher than that under the condition of non-straw mulching in the paddy field. The number of preferential flow paths of both conditions are decreased by with increasing soil depth. But the number of preferential flow paths for paddy fields under the condition of straw mulching fell faster at the speed of 4.48 times. The average complexity of preferential flow paths under the condition of straw mulching is 2.11, while the average complexity of preferential flow paths is 2.14 in the paddy field under non-straw mulching conditions, and the difference between the two is significant (P < 0.05). In other words, the non-straw mulching preferential flow paths has a higher degree of distortion, which is reflected in the spatial distribution state of more concentrated path, and measures of straw mulching affect the preferential flow paths of paddy field. Although straw mulching accelerates the movement of soil surface water flow, the development of preferential flow paths in deep soil and the deep leakage of field water and fertilizer are reduced, which improves the utilization rate of water and fertilizer in crop ploughing layer to some extent
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