甘蔗冠层对降雨再分配的影响

目的]研究作物植被对于土壤侵蚀的防治作用,为砖红壤区土壤侵蚀预报模型的建立提供作物参数。方法]通过室内人工模拟降雨试验,测定了甘蔗不同生育期不同降雨强度条件下的穿透雨量、茎杆流量和冠层截留量,分析叶面积指数对于降雨再分配的影响。结果]穿透雨量、茎杆流量和冠层截留量分别从甘蔗幼苗期的94.7%,5.1%,0.3%变化为成熟期的49.4%,47.3%和3.4%。结论]叶面积指数与穿透雨量呈显著负线性相关,与茎杆流量和冠层截留量呈显著正线性相关。

Effects of Sugarcane Canopy on Rainfall Redistribution

Objective] To study the effects of crop vegetation on the prevention and control of soil erosion in order to provide crop parameters to establish erosion prediction model for the laterite area.Methods] Through the artificial rainfall simulation experiment, throughfall, stemflow and canopy interception were measured in different growth stages of sugarcane and different rainfall intensity conditions, and leaf area index for the effects of rainfall redistribution were analyzed.Results] The throughfall, stemflow and canopy interception changed from 94.7%, 5.1% and 0.3% in the sugarcane seedling stage to 49.4%, 47.3% and 3.4% in the mature stage, respectively. Conclusion] The sugarcane leaf area index had a significant negative linear correlation with throughfall, and a significantly positive linear correlation with the stemflow and canopy interception.