CHEN Xue,SONG Yali,WANG Keqin,et al.Moisture Characteristics Under Contour Reverse-Slope Terrace Based on Van Genuchten Model[J].Research of Soil and Water Conservation,2019,26(05):45-52.
基于Van Genuchten模型的等高反坡阶下土壤水分特征
- Title:
- Moisture Characteristics Under Contour Reverse-Slope Terrace Based on Van Genuchten Model
- 关键词:
- 等高反坡阶; 坡耕地; 土壤水分特征曲线; Van Gennuchten模型; 持水性
- Keywords:
- contour reverse-slope terrace; slope farmland; soil water characteristic curve; Van Genuchten model; water-holding
- 分类号:
- S152.7
- 摘要:
- 为了阐明等高反坡阶处理对土壤持水性的改善作用，选取滇中昆明市北郊松华坝迤者小流域为研究区，研究等高反坡阶对坡耕地0—100 cm土层土壤水分特征曲线的影响，使用vanFit软件拟合获得Van Genuchten模型参数，阐明各土层土壤持水性及其与影响因子的关系。结果表明：（1）等高反坡阶对坡上部影响不显著（p>0.05），对坡中部影响显著（p<0.05），对坡下部影响极显著（p<0.01）；（2）与土壤水分特征曲线参数的关系中，容重和砂粒含量呈负相关，总孔隙度、毛管孔隙度和粉粒含量呈正相关；（3）模型拟合土壤水分特征曲线的决定系数R2均高于0.85，可靠性较高；原状坡耕地（1.719 6）和等高反坡阶处理坡耕地（1.773 5）的n值均在10—20 cm土层最大，土壤在10—20 cm土层的土壤含水率变化较大，等高反坡阶处理坡耕地的土壤含水率变化大于原状坡耕地；（4）原状坡耕地和等高反坡阶处理坡耕地均在10—20 cm土层供水性好，等高反坡阶处理坡耕地在40—60 cm土层持水能力强，而原状坡耕地在20—40 cm土层持水能力强。综上，等高反坡阶处理对坡耕地土壤的保水性能具有明显的提高作用，对坡耕地地表径流拦蓄、增加水分入渗和减少土壤流失起到了明显的改善作用。
- Abstract:
- In order to elucidate the effect of equal high reverse slope treatment on soil water retention, the small watershed of Yizhe in Songhuaba Dam in Kunming northern suburb of central Yunnan was selected as a research area in this study, and the influence of such contour reverse-slope terrace on soil water characteristic curve of 0-100 cm soil in sloping farmland was studied. Vanfit software was used to obtain Van Genuchten model parameters, and the relationship between water retention and its influencing factors in each soil layer was expounded. The results showed that:(1) the effect of contour reverse-slope terrace on the upper slope was not significant (p>0.05), its effect on the middle slope was significant (p<0.05), and its effect on the lower part of the slope was very significant (p<0.01); (2) in relation to the parameters of soil water characteristic curve, the bulk density and the content of sand grain were negatively correlated, and total porosity, capillary porosity and particle content were positively correlated; (3) the determining coefficients of the model fitting soil moisture characteristic curve were higher than 0.85, and the R2 was higher reliability; the n values of the undisturbed slope cultivated land (1.719 6) and the contour reverse-slope trrace treatment slope cultivated land (1.773 5) were the largest in the 10-20 cm soil layer; the change of soil moisture content in sloping farmland with contour reverse-slope terrace was greater than that of intact sloping farmland; (4) soil water availabilities is higher in 10-20 cm soil layers of the slope farmland of the original sloping farmland and the contour reverse-slope terrace treatment slope cultivated land, and water holding capacity in 40-60 cm soil layer of the slope farmland treated with contour reverse-slope terrace was strong, and water holding capacity in the 20-40 cm soil layer of the undisturbed sloping farmland was strong. In conclusion, sloping farmland soil under the treatment of contour reverse-slope terrace had the significant effect on the performance of soil water retention, which played an important role in improving the surface runoff interception, increasing water infiltration and reducing soil loss.
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备注/Memo
收稿日期:2018-11-04;改回日期:2018-11-27。
基金项目:云南省科技计划重点研发项目（2018BB018）；国家自然科学基金（30660037）；云南省应用基础研究青年项目（2016FD044）
作者简介:陈雪(1992-),女,山东泰安人,硕士,主要从事土壤水分特征研究。E-mail:13053862529@163.com
通讯作者:王克勤(1964-),男,甘肃庄浪人,博导,教授,主要从事小流域环境综合治理的理论与技术研究。E-mail:wangkeqin7389@sina.com