Comprehensive evaluation of throughfall erosion in the banana plantation

贯通 飞溅 茎流 地表径流 腐蚀 林冠截留 环境科学 拦截 水文学(农业) 水土保持 侵蚀控制 雨季 天蓬 农林复合经营 土壤水分 土壤科学 地理 农业 地质学 生态学 古生物学 岩土工程 地图学 考古 生物 气象学
作者
Shuoyang Ji,Shida Irwana Omar,Shuaibing Zhang,Tianfang Wang,Chunfeng Chen,Wanjun Zhang
出处
期刊:Earth Surface Processes and Landforms [Wiley]
卷期号:47 (12): 2941-2949 被引量:11
标识
DOI:10.1002/esp.5435
摘要

Abstract Banana is an important cash crop in tropical and subtropical areas; however, the development of banana farming has caused thorny ecological problems, such as water and soil loss. There are few studies on the runoff response to rainfall in banana land to date. In this study, several evaluation indexes, rainfall redistribution, throughfall erosivity, splash kinetic energy, soil splash loss and runoff, respectively, were used to clarify the mechanism of soil erosion in banana land. Results showed that the atmospheric rainfall was significantly redistributed by the banana canopy, with about 81.2% throughfall, 8.3% stemflow and the rest canopy interception. Although the throughfall erosivity evaluated by the model was slightly lower than that of open rainfall, the throughfall kinetic energy and the soil particle splash loss reached 1.5 times and 5 times higher than that of open rainfall, respectively. Consequently, throughfall has an obvious splash erosion effect on the surface soil. In addition, influenced by throughfall and stemflow, surface runoff during the rainy season (May–September) accounts for the annual 91.7%, July and August in particular having the highest incidence of soil erosion in banana land. The above results suggest that the convergence effect of the banana canopy on rainwater is the main inducement for the increase in throughfall volume and surface runoff volume. Therefore, it is necessary to implement soil and water conservation measures on banana fields during the rainy season, such as planting low vegetation under the banana canopy to mitigate splash effects.
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