Distribution and Influencing Factors of Preferential Path under Citrus Land
A investigation was conducted to analyze the distribution of preferential flow path under different citrus land in Jiangjin District of Chongqing. The relationship of the preferential flow paths with the properties of the soil and root length per soil volume was analyzed. The distribution of preferential flow path was analyzed by using the methods of brilliant blue dye and image analysis. The correlation of the preferential flow paths with the properties of the soil and root length per soil volume was analyzed by SPSS. The results showed that the percentage of both horizontal dye-stained area and vertical dye-stained area under different citrus land were below 7% because of the infiltration of water and solute changed by preferential flow path. The saturated hydraulic conductivity was the only parameter of soil properties with significant relation (P<0. 05) with horizontal dye-stained soil under different citrus land under similar soil texture. Preferential flow path is the important channel of water and solute despite the little dye coverage. The preferential flow path is significantly (P<0. 01) related with the root length per soil volume with root diameter from 1 mm to 3 mm. With the increase of forest age, the preferential flow path is enlarged by the widely distributed roots in horizontal and vertical. The root length per soil volume from 1 mm to 3 mm is the main influencing factor of preferential flow path under citrus land.
NETL
NSTL
万方数据
维普
