典型岩溶石山山坡土壤剖面水分分层性特征及其影响因素

发布时间：2018-07-04 19:17

本文选题：岩溶石山 + 土壤质量水含量　；参考：《南方农业学报》2017年07期

【摘要】：【目的】揭示岩溶石山山坡土壤剖面水分的分层性及其与土壤理化性质间的相互关系,为我国南方岩溶地区石漠化治理、水土流失和岩溶水文过程等研究提供科学依据。【方法】选取典型岩溶石山山坡土壤剖面进行分层取样,结合统计分析方法,研究岩溶石山地区土壤水含量的垂向分布特征及其影响因素,分析土壤剖面水含量的分层特征。【结果】岩溶石山山坡土壤剖面水含量具有明显差异,变化范围为34.66%~47.10%,平均值为38.15%,土壤质量水含量的最大值出现在35 cm深处。相关性分析结果表明,土壤质量水含量与有机质含量呈显著正相关(P0.05,下同),与pH呈显著负相关,与中值粒径相关性不显著(P0.05);有机质通过改善土壤团聚体结构影响土壤质量水含量变化。土壤质量水含量及理化性质的变化具有分层性,地表至35 cm为表土层,35~85 cm为过渡层,85~115 cm为稳定层。【结论】岩溶石山地区土壤剖面水分具有明显的分层性,是土壤性质、结构特征、根系活动、水分运动、化学淋滤作用及基岩界面综合作用的结果,尤其应注意20~40 cm处植被根系活动及基岩界面对土壤剖面水分变化的影响。
[Abstract]:[objective] to reveal the stratification of soil moisture and the relationship between soil moisture and soil physical and chemical properties in the hillside of Karst Mountain, so as to control the rocky desertification in karst areas of southern China. Soil erosion and karst hydrological process provide scientific basis. [methods] the soil profile of typical karst mountain slopes is selected for stratified sampling and combined with statistical analysis method. The vertical distribution characteristics of soil water content and its influencing factors in karst rock mountain area are studied, and the stratification characteristics of soil water content in soil profile are analyzed. [results] the soil water content of karst rock mountain slope has obvious difference. The range of variation was 34.66 and 47.10, the average value was 38.15. The maximum water content of soil mass appeared in the depth of 35 cm. The results of correlation analysis showed that there was a significant positive correlation between soil quality water content and organic matter content (P0.05, the same below), and a significant negative correlation between soil water content and pH value. There was no significant correlation with median particle size (P0.05); organic matter affected soil quality and water content by improving soil aggregate structure. The changes of soil quality and water content and physicochemical properties are stratified, the surface to 35 cm is the top layer 35 ~ 85 cm, and the transitional layer is 85 ~ 115 cm. [conclusion] the soil profile moisture in karst area has obvious stratification and is the soil property. The results of structural characteristics, root system activity, water movement, chemical leaching and comprehensive action of bedrock interface should be paid special attention to the effect of vegetation root activity and bedrock interface on soil profile water change at 2040 cm.
【作者单位】：中国地质科学院岩溶地质研究所/国土资源部广西岩溶动力学实验室;广西水文地质工程地质队;中国地质大学(北京);
【基金】：国家自然科学基金项目(41402326) 中国地质调查局地质调查项目(DD20160305) 广西自然科学基金项目(2015GXNSFBA139202) 中国地质科学院水文地质环境地质研究所基本科研业务费项目(SK201403)
【分类号】：S152.7

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