论文部分内容阅读
为了研究不同生物调控措施的植被覆盖度、降雨强度和坡度以及各因素间交互作用对土壤水分入渗的影响,本文通过室外人工模拟降雨试验,对不同生物调控措施坡面的土壤水分入渗规律进行了探索。结果表明:1)有生物调控措施坡面的土壤稳定入渗率较裸坡偏大,且差异极显著,但生物调控措施坡面之间的差异并不明显。2)降雨强度、坡度与土壤稳定入渗率间不是线性单值函数,均存在使土壤稳定入渗率最大的临界雨强与临界坡度。稳定入渗率随植被覆盖度增加的速率是非恒定的,存在着增速变化的临界植被覆盖度。临界植被覆盖度前,稳定入渗率的增加速率很快,之后,迅速降低并趋于稳定。3)坡面径流调控度随雨强增大而减小;相同雨强下不同措施坡面径流调控度排序为:黑麦草>春小麦>苜蓿>裸坡。4)采用SPSS软件通过逐步回归分析法提取了影响土壤稳定入渗率最显著的单因子交互作用项,建立了包含降雨强度、坡度和植被覆盖度在内的多因素非线性入渗模型,通过实测数据对其进行验证发现该模型精度较高。
In order to study the effects of different biological control measures on vegetation coverage, rainfall intensity and slope, and the interaction of various factors on soil water infiltration, this paper studied the law of soil water infiltration on different slopes by artificial simulated rainfall experiment Have explored. The results showed that: 1) There was biodegradable control slope stability of the soil infiltration rate is larger than the bare slope, and the difference was significant, but the difference between the biological control measures slope is not obvious. 2) There is not a linear single-valued function between rainfall intensity, slope and soil infiltration rate. Both the critical rainfall intensity and the critical slope with the largest soil infiltration rate are existed. The rate of steady infiltration rate increases with the vegetation coverage is not constant, there is a critical vegetation coverage of growth changes. Before the critical vegetation coverage, the rate of increase of steady infiltration rate was very fast, then rapidly decreased and stabilized. 3) The degree of slope runoff regulation decreases with the increase of rainfall intensity; The order of regulation of runoff under different rainfall intensity measures is: ryegrass> spring wheat> alfalfa> bare slope. 4) SPSS software was used to extract the single-factor interaction term that affected the stable soil infiltration rate by stepwise regression analysis. The multi-factor nonlinear infiltration model including rainfall intensity, slope and vegetation coverage was established. The measured data verified that the accuracy of the model.