聚乙烯醇形成土壤水稳性团粒的效果研究

Study on the Effects of PVA on the Formation of Soil Water-stable Crumbe

研究了在3种土壤氢离子浓度（10000nmol·L-1、361．2、10μmol·L-1、2种温度（10℃、30℃）下，不同浓度的聚乙烯醇（PVA）形成土壤水稳性团粒的效果。研究了PVA对土壤水分散失量以及酸性～弱酸性土壤氢离子浓度的影响。结果表明：0.01％～0.1％PVA能有效地形成土壤水稳性团拉；1％PVA在上述2种温度、3种氢离子浓度条件下成团效果尤为明显。另外，PVA能减少土壤水分的散失量和增加酸性～弱酸性土壤的氢离子浓度值。

The effects of polyvinyl aliohol (PVA) on the formation of soil water-stable crumbs were determined at two temperatures (10 ℃.,and30℃),three soil [H+] (10 000. 361. 2 、10μmol. L-1 ) and a variety of concentration of PVA. The changes of soil water evaporation and acid soil [H+] caused by PVA were also discussed. The results indicated that 0. 01 % ~0. 1% PVA can effectively from the soil water-stable crumbs. The effect of the 1. 0%PVA was especially remarkable under these conditions. Furthermore, PVA can increase acid soil [H+] and reduce the soil water evaporation.