百喜草对红粘土性红壤抗冲性的研究

研究表明：（１）百喜草下表层土壤的冲刷量和抗冲性动态过程可用对数方程ｙ＝ａｌｎ（ｘ）＋ｂ进行拟合，但土壤冲刷量和抗冲性的剖面分布不表现出规律性。（２）与裸地和农地比较，百喜草可明显提高农层土壤的抗冲性能，但百喜草下土壤抗冲性的剖面分布与剖面中根系的分布之间无明显的相关性。（３）由于百喜草的葡匐生长习性，使其在径流的冲刷过程中，一方面使径流的侵蚀力下降，另一方面提高了表土的抗冲性，这使百喜草在低丘红

A Study on the Effects of Paspalum notatum Flugge on the Anti-Scouribility of Red Earth Formed From Red Clay

It is reported that: (1) The dynamic processes of the scouring loss and the anti-scouribility of soil under the grass Paspalum notatum flugge can be recovered using the logarithmic equation y=aln(x)+b, but no correlations can be built between soil loss and soil anti-scouribility with soil depth. (2) Remarkable intensifying effect of the grass on the surface soil anti-scouribility is found when compared with bare soil and/or farm land. But no correlations are found between soil anti-scouribility with the grass root. (3) The grass Paspalum notatum flugge can decrease the erosivity of runoff, and increase the anti-scouribility of surface soil when runoff scouring occurs due to its characteristic of crawling growth. And this makes it an optimum grass for soil conservation in the hilly red-clayed red earth region.