腐植酸类制剂改良松嫩平原盐渍化草场的研究

Study on Amending Alkali-saline Grassland by Applying Humic Acid Amendment in Songnen Plain

为寻求改良退化草场更为有效、经济的措施,利用腐植酸类物质的改土特性,与白俄罗斯合作研制出改良松嫩盐渍土地区退化草场的腐植酸制剂。结果表明,应用腐植酸的各个处理覆盖度比对照有不同程度的提高,并能够促进向优质羊草群落的演替。从连续两年的生物量测定可知,轻、重盐渍土上植物生物量都比对照有不同程度的提高。应用腐植酸各个处理的植物生物量均随年度的增加而呈逐年上升趋势,在盐渍化程度高的土壤上这种效果尤其显著。从退化草场的改良效果看,轻度盐渍化草场每年施入30千克/亩复合制剂改良效果较好,重度盐渍化草场以一次性施入4000千克/亩的腐植酸物质的改良效果明显。

To explore more valid and economic measures of improving degenerative grassland, this study that is cooperated with Belorussia has developed the amendment of humic acid that improved degenerative grassland in the area of alkali-saline soil in Songnen plain using the property of humic acids improving soil. The results showed that the vegetation coverage in each treatment with humic acid amendment increased in different degree compared with the control, and the succession to good Leymus Chinensis community was promoted. Meantime, the plant biomass in slight and heavy alkali-saline soil also increased during two years, especially in the later, which the result was especially signifi- cant in heavy alkali-saline soil. It was available for improving degenerative grassland to apply 30 kg amendment per 667 m^2 yearly in slight alkali-saline grassland area and 4000 kg amendment per 667 m^2 singly at serious alkali-saline grassland area.