三峡库区山地不同森林地段烘干土入渗过程研究

发布时间：2018-04-21 07:52

  本文选题：烘干土入渗 + 基质域　； 参考：《土壤通报》2017年01期

【摘要】：利用室内定水头入渗法,观测三峡不同森林地段烘干土的入渗性能,比较大孔隙域与基质域烘干土入渗的差异,探究影响烘干土入渗性能的原因,评价常用入渗模型对不同属性烘干土壤入渗过程的适宜性。结果表明:三峡库区各森林地段基质域A层土壤的入渗能力强于B(或C)层土壤,B(或C)层土的40 min累积入渗量只占到A层土的29.79%~45.07%;不同林型覆盖下基质域烘干土壤入渗能力相比较,温性落叶阔叶林山地棕壤常绿落叶阔叶混交林山地黄棕壤暖性针叶林山地黄壤常绿阔叶林山地棕红壤,温性落叶阔叶林山地棕壤40 min的累积入渗量是常绿阔叶林山地棕红壤的32.08~48.53倍。大孔隙域烘干土的入渗速率亦符合先下降后趋于稳定的一般入渗规律,大孔隙域比基质域烘干土的入渗性能更好,其40 min累积入渗量可以达到基质域的0.99~2.95倍。三峡库区森林烘干土的入渗能力与土壤容重和土粒密度呈极显著负相关关系(P0.01),与土壤通气孔隙度(0.02 mm)和有机质含量呈极显著正相关关系(P0.01)。方正三通用公式对于基质域A层土和大孔隙域烘干土的入渗过程拟合效果较好,Horton方程对于基质域B(或C)层烘干土的入渗过程有较高的拟合度。
[Abstract]:The infiltration performance of dry soil in different forest areas of the three Gorges region was observed by the method of fixed water head infiltration in laboratory. The difference of infiltration between big pore region and substrate region was compared, and the reasons influencing the infiltration performance of dry soil were explored. To evaluate the suitability of commonly used infiltration models for soil infiltration with different properties. The results showed that the infiltration capacity of A layer soil in each forest area of the three Gorges Reservoir area was stronger than that of B (or C) layer soil layer B (or C) layer soil, the cumulative infiltration capacity of B (or C) layer soil for 40 min only accounted for 29.7975% of A layer soil, and the infiltration ability of dry soil in different forest cover was compared. Temperate deciduous broad-leaved forest mountain brown soil evergreen deciduous broad-leaved mixed forest mountain yellow brown soil warm coniferous forest mountain yellow soil evergreen broad-leaved forest mountain brown red soil, The cumulative infiltration of temperate deciduous broad-leaved broad-leaved mountain brown soil for 40 min was 48.53 times that of evergreen broad-leaved forest. The infiltration rate of drying soil in macroporous domain also accords with the general infiltration law that decreases first and then tends to stable. The infiltration performance of dry-soil in macroporous domain is better than that in substrate domain, and the cumulative infiltration amount in 40 min can reach 0.99 ~ 2.95 times of that in matrix domain. The infiltration ability of forest drying soil in the three Gorges Reservoir area was negatively correlated with soil bulk density and soil particle density (P0.01), and was positively correlated with soil aeration porosity (0.02 mm) and organic matter content (P 0.01). Fangzheng three general formulas fit well the infiltration process of matrix A layer soil and macroporous dry soil. Horton equation has a higher fitting degree for B (or C) layer dry soil infiltration process.
【作者单位】： 地理过程分析与模拟湖北省重点实验室;华中师范大学城市与环境科学学院;
【基金】：国家自然科学基金(41001125) 湖北省自然科学基金重点项目(2015CFA141) 华中师范大学中央高校科研基本业务费(CCNU16JCZX09)
【分类号】：S714
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本文编号：1781549