Characteristics of soil saturated hydraulic conductivity in classic suburb shelter forests in the Three Gorges Reservoir

MA Siwen, ZHANG Hongjiang, CHENG Jinhua, LI Mingfeng, WANG Ping

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (05) : 99-106.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (05) : 99-106. DOI: 10.3969/j.issn.1000-2006.201711054

Characteristics of soil saturated hydraulic conductivity in classic suburb shelter forests in the Three Gorges Reservoir

  • MA Siwen, ZHANG Hongjiang*, CHENG Jinhua, LI Mingfeng, WANG Ping
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Abstract

【Objective】The change of characteristics in the soil profile saturated hydraulic conductivity was analyzed and the law of movement of soil moisture at different soil depths was understood, which provided a scientific reference for improving the afforestation model of shelter forest.【Method】In this paper, four artificial forests, including coniferous pure forest, mixed coniferous forest, mixed broadleaf forest, mixed coniferous-broadleaf forest and wasteland, were chosen to discuss the characteristics of soil saturated hydraulic conductivity in these four kinds of artifical forests and the relationship of its impact factors with the method of determining soil saturated hydraulic conductivity at the fixed water level.【Result】Soil saturated hydraulic conductivity exhibited a negative exponent as the depth of soil increased and soil saturated hydraulic conductivities of various forests ranked in descending order were as follows:mixed coniferous-broadleaf forest>mixed broadleaf forest>mixed coniferous forest>coniferous pure forest>wasteland. Soil organic matter content and soil saturated hydraulic conductivity are in a quadratic curve. The higher the species richness, the greater the saturation of the soil. As the content of organic matter increased, the average soil saturated hydraulic conductivity increased, but the rapid increase began to slow gradually. When the content of organic matters reached the maximum(18.596 g/kg), the rapid increase became increasingly gentle. Unit weight of soil and porosity are the main impact factors of soil saturated hydraulic conductivity. Mechanical composition is the secondary factor. Other physical factors have no large impact.【Conclusion】Different soil physical and chemical factors have different effects on soil saturated hydraulic conductivity. The higher the soil saturated hydraulic conductivity, the stronger the effect on delay of surface runoff. Therefore, in the construction of the protection forest, it is suitable to build a compound protective forest, which can help to maintain soil and water, wind proof and sand fixing, and improve environment and maintain ecological balance.

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MA Siwen, ZHANG Hongjiang, CHENG Jinhua, LI Mingfeng, WANG Ping. Characteristics of soil saturated hydraulic conductivity in classic suburb shelter forests in the Three Gorges Reservoir[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2018, 42(05): 99-106 https://doi.org/10.3969/j.issn.1000-2006.201711054

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