| Research on water-holding capacity and related factors in typical soils of Gansu province |
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| DOI：10.7606/j.issn.1000-7601.2017.01.22 |
| Key Words: typical soil of Gansu province soil water characteristic curve specific water capacity soil physical properties influencing factors |
| Author Name | Affiliation | | LIU Xiao-ning | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | LONG Rui-hong | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Tanchang County Finance Bureau, Longnan, Gansu 7485003, China | | LUO Zhu-zhu | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | CAI Li-qun | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China
Gansu Engineering Research Center for Agriculture Water-saving, Lanzhou, Gansu 730070, China | | Dong Bo | Gansu Engineering Research Center for Agriculture Water-saving, Lanzhou, Gansu 730070, China |
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| Abstract: |
| The soil water-holding capacity is evidence to measure the absorption and holding abilities of soil. This research studied twelve soil physical properties in four soil areas from Gansu, and measured the gravity moisture content in different soil suctions, utilized the Gardner experience equation to plot a soil water characteristic curve, and investigated the typical soil water-holding capacity and the influencing factors. The results show that there are significant variationsfortypical soil water-holding capacities in Gansu. In general, the soil water-holding capacity and water supply lability in the Gannan plateau are superior and stable, and the parameter A of typical soil in this region all exceeded 20. The best soil water supply ability belongs to the mountainous and hilly regionin Longnan, with parameter A value of typical soil reaching 24. Its water-holding capacity is good, but the stability is weak. The soil in the Loess Plateau has moderate water-holding ability and feeble water supply, as well as the best stability, compared with the other research areas. Both soil water-holding capacity, water supply capacity and the stability in the Hexiarid and semi-arid regionsare poor, the parameter A of this typical soil was all lower than 17, except for the fluvo-aquic soil. In addition, soil texture(<0.002 mm clay content) and total porosity affect the soil water-hold capacity obviously, followed by capillary porosity, density and volume weight. |
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