桂林喀斯特地区干湿循环过程中土壤水含量的空间变异

发布时间：2018-03-09 02:02

本文选题：干湿循环　切入点：土壤水含量　出处：《南方农业学报》2017年09期 　论文类型：期刊论文

【摘要】：【目的】研究桂林喀斯特地区干湿循环过程中土壤水含量的空间分布变化,为解决该地区农田水土流失及农作物防旱抗旱提供理论依据。【方法】选取种植有大豆、梨树和甘蔗3种不同农作物的耕作地为试验地,分析3种试验地在干湿交替条件下土壤表层0~6 cm土壤水含量的空间变异,并利用地统计方法研究不同土地利用方式下的土壤空间分布变异。【结果】大豆、梨树和甘蔗3种试验地的土壤质地差异不显著(P0.05),土壤容重表现为梨树地最小,但土壤有机质含量和总孔隙度均以梨树地最高。3种试验地湿润阶段的土壤水含量是干旱阶段土壤水含量的2~3倍。在整个干旱—湿润循环过程中,3种试验地的土壤水含量均表现为梨树地甘蔗地大豆地,土壤水含量空间分布比为37.18%~95.99%,呈中等偏上的空间相关性,说明试验地的空间分布在一定范围内表现稳定,但因不同的土地利用方式存在一定变异性,变异强度也因其耕作方式或管理方式的不同而异。【结论】桂林喀斯特地区土壤自身具有维持其土壤水含量空间分布稳定的能力,但耕作方式、灌溉等人为因素在一定程度上会削弱土壤水含量的空间稳定性。
[Abstract]:[objective] to study the spatial distribution of soil water content during dry and wet cycle in karst area of Guilin, so as to provide a theoretical basis for solving soil erosion and drought prevention and drought resistance of crops in this area. [methods] Soybean was planted. The cultivated land of three different crops, pear tree and sugarcane, was used to study the spatial variation of soil water content in 0 ~ 6 cm soil under the condition of alternate dry and wet. The spatial distribution and variation of soil under different land use patterns were studied by means of geostatistics. [results] the soil texture of soybean, pear and sugarcane was not significantly different, but the soil bulk density was the smallest. However, the soil organic matter content and total porosity of the soil were the highest in the pear tree field. 3. 3. The soil water content in the wetting stage was 2 ~ 3 times higher than that in the drought stage. During the whole arid-humid cycle, the soil water content of the three experimental plots was 3 times. The water content in the sugarcane field of pear tree field is soybean field, The spatial distribution ratio of soil water content was 37.18% and 95.99m, which showed a moderate spatial correlation, which indicated that the spatial distribution of the experimental land was stable in a certain range, but there was some variability in different land use patterns. [conclusion] the soil in karst area of Guilin has the ability to maintain stable spatial distribution of soil water content. Artificial factors such as irrigation will weaken the spatial stability of soil water content to some extent.
【作者单位】：桂林理工大学广西岩溶地区水污染控制与用水安全保障协同创新中心;桂林理工大学广西环境污染控制理论与技术重点实验室;广西农业科学院微生物研究所;桂林市农业科学院;
【基金】：国家自然科学基金项目(41501230,31360356) 广西自然科学基金项目(2016GXNSFAA380197) 广西中青年教师基础能力提升项目(2017KY0270)
【分类号】：S152.7

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