红壤坡耕地不同植物篱配置模式减流减沙效益对比

植物篱作为坡耕地一种有效的水土保持生物措施,已有大量的研究。但对植物篱带内降雨产生的径流泥沙过程细化研究较少,有必要从微区尺度研究篱带范围内多种植物篱的减流减沙效益,并进行植物篱品种以及搭配模式的筛选。在模拟降雨条件下,本试验选取3种单一植物模式(黄花菜,香根草,百喜草),每种植物各设置3种篱带宽(1行,2行,3行),以及4种组合植物模式(1行黄花菜+2行百喜草,1行香根草+2行百喜草,1行香根草+2行黄花菜,1行百喜草+1行香根草)、1组对照,进行产流产沙过程比较,试验结果表明,各植物篱模式均不同程度地改善了土壤理化性质,减少了水土流失量;同类植物中,2行植物篱即可达到较好的水保效果;组合植物篱模式的减流减沙效益优于单一植物篱模式。

Comparison of Benefits of Runoff and Sediment Reduction of Different Hedgerow Configuration Modes in Red-soil Hilly Area

As one of the biological measures for soil and water conservation, hedgerows have been studied widely, but little information is available on their runoff and sediment process, thus it is necessary to study the benefits of runoff and sediment reduction in multiple hedgerows and to compare the benefits of different hedgerows configuration modes. The simulated rainfall experiment was conducted on three kinds of single plant modes, i.e., Hemerocallis citrine, Vetiveria zizanioides L., Paspalum natatum, and four kinds of combined modes, and a control plot, to compare the process of runoff and sediment-yield. three kinds of width of the single plant modes were set, respectively, which were 1, 2 and 3 lines, and the combination modes were 1 line of H. citrine and 2 lines of P. natatum, 1 line of V. zizanioides and 2 lines of P. natatum, 1 line of V. zizanioides and 2 lines of H. citrine, 1 line of P. natatum and 1 line of V. zizanioides. The results showed that all the different hedgerow modes improved soil physical and chemical properties and reduced water loss and soil erosion in different degrees. As for the same plant, the 2 line hedges achieved the better benefits of soil and water conservation. On the other hand, the benefits of runoff and sediment reduction of the combined modes were better than the single plant modes.