Study on Soil Saturated Hydraulic Conductivity and Its Influencing Factors in Typical Grassland of Farmland Conversion

doi:10.11733/j.issn.1007-0435.2016.06.015

Acta Agrestia Sinica ›› 2016, Vol. 24 ›› Issue (6): 1254-1262.DOI: 10.11733/j.issn.1007-0435.2016.06.015

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Study on Soil Saturated Hydraulic Conductivity and Its Influencing Factors in Typical Grassland of Farmland Conversion

WANG Zi-long¹, ZHAO Yong-gang², ZHAO Shi-wei^1,3, HUANG Jing-hua^1,3, DU Can¹, SHANG Ying-ni¹

1. College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling, Shaanxi Province 712100, China;
2. School of Life Science, Shanxi Normal University, Linfen, Shanxi Province 041004, China;
3. Institute of Soil and Water Conservation, Northwest Agriculture and Forestry University, Yangling, Shaanxi Province 712100, China

Received:2016-01-12 Revised:2016-08-30 Online:2016-12-15 Published:2017-03-18

退耕典型草地土壤饱和导水率及其影响因素研究

王子龙¹, 赵勇钢², 赵世伟^1,3, 黄菁华^1,3, 杜璨¹, 尚应妮¹

1. 西北农林科技大学资源环境学院, 陕西杨凌 712100;
2. 山西师范大学生命科学学院, 山西临汾 041004;
3. 西北农林科技大学水土保持研究所, 陕西杨凌 712100

通讯作者: 赵世伟
作者简介:王子龙(1988-),男,新疆乌鲁木齐人,博士研究生,从事土壤结构与入渗研究,E-mail:wzl_1988@163.com
基金资助:
国家自然科学基金青年科学基金（41401242）；国家自然科学基金（41330852）资助

Abstract

Abstract:

Soil saturated hydraulic conductivity is an important parameter to reflect the infiltration capacity of soil water. In this study, the soil saturated hydraulic conductivity (0~40 cm) and its influencing factors in typical grassland of farmland conversion in the Yunwu Mountain were investigated by field investigation and laboratory test. The variation of soil saturated hydraulic conductivity was revealed through variance analysis and path analysis. Research showed that the soil saturated hydraulic conductivity significantly increased from 4.16 mm·min^-1 to 6.74 mm·min^-1 in the period of first 3 to 22 year, 61.9% increase. In this stage, the stability of soil aggregates in 0~40 cm soil layer was improved significantly, especially in 20~40 cm soil layer. In the first three years, content of soil organic matter showed a downward trend, and reached the minimum of 17.79 g·kg^-1 at the third year. Then, the content began to increase, and reached 52.49 g·kg^-1 at the twenty-fourth year, 195.1% increase. The content of organic matter decreased with the increase of soil depth. Contents of soil water-stable aggregates and organic matter were main impact factors to the water saturated hydraulic conductivity. When the contents of water-stable aggregates and organic matter increased one unit, the soil saturated hydraulic conductivity increased 2.4% and 1.2%, respectively.

Key words: Yunwu Mountain, Abandoned lands, Soil saturated hydraulic conductivity, Aggregate stability, Soil organic matter

摘要：

土壤饱和导水率K_s（soil saturated hydraulic conductivity）反映土壤水分入渗能力，是重要的水力参数。通过对云雾山典型草原区不同年限退耕地0~40 cm土层的土壤饱和导水率进行测定，并对土壤饱和导水率及其影响因子进行了方差和通径分析。研究表明：退耕过程有利于提高土壤饱和导水率，退耕第3-22年，饱和导水率从4.16 mm·min^-1增加到6.74 mm·min^-1，提高了61.9%。在这一阶段0~40 cm土层土壤团聚体稳定性整体得到改善，其中20~40 cm土层土壤团聚体稳定性改善更为明显。退耕开始阶段（3年）土壤有机质含量下降至最低，仅为17.79 g·kg^-1，随后有机质迅速积累，到退耕24年时含量达52.49 g·kg^-1，增加了195.1%。土壤水稳性大团聚体含量和有机质含量是影响饱和导水率的主要因素，水稳性团聚体直接作用更显著，有机质间接作用更显著。每增加1个单位水稳性大团聚体含量，饱和导水率提高2.4%，而土壤有机质含量增加1个单位，土壤饱和导水率只提高1.2%。

关键词: 云雾山, 退耕地, 土壤饱和导水率, 团聚体稳定性, 土壤有机质

CLC Number:

S152.7

WANG Zi-long, ZHAO Yong-gang, ZHAO Shi-wei, HUANG Jing-hua, DU Can, SHANG Ying-ni. Study on Soil Saturated Hydraulic Conductivity and Its Influencing Factors in Typical Grassland of Farmland Conversion[J]. Acta Agrestia Sinica, 2016, 24(6): 1254-1262.

王子龙, 赵勇钢, 赵世伟, 黄菁华, 杜璨, 尚应妮. 退耕典型草地土壤饱和导水率及其影响因素研究[J]. 草地学报, 2016, 24(6): 1254-1262.

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Study on Soil Saturated Hydraulic Conductivity and Its Influencing Factors in Typical Grassland of Farmland Conversion

退耕典型草地土壤饱和导水率及其影响因素研究

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