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采用酸滴定土壤酸度的方法研究广西蔗地土壤对酸的缓冲性能,结果表明,广西赤红壤蔗地土壤酸缓冲能力不强且对酸敏感,其土壤酸化转折点在加入模拟酸雨pH值3.0-3.5之间。酸雨会造成蔗地土壤严重酸化,而年施用75t/hm2酒精废液对蔗地土壤酸化影响较小。影响土壤酸缓冲性能因素主要为有机质、物理性粘粒、盐基总量和交换钙。据此可采取增施有机肥,施用碱性物质如石灰或碱性肥料如钙镁磷肥,以及增加土壤覆盖如蔗叶还田,或采取等高种植等措施,增加土壤有机质和交换性阳离子含量,减少土壤粘粒及阳离子流失,降低土壤酸度,从而提高蔗地土壤酸缓冲能力,改善蔗地土壤生态环境。
The acidity of acid soils in sugarcane field in Guangxi was studied by acid titration method. The results showed that the acid buffering capacity of sugarcane field in red soil of Guangxi was not so strong and sensitive to acid. The soil acidification turning point of the sugarcane field in Guangxi was controlled by the pH 3.0-3.5 between. Acid rain can cause severe soil acidification in sugarcane fields, while annual application of 75t / hm2 alcohol wastewater has little effect on soil acidification in sugarcane fields. Affect the soil acid buffer properties are mainly organic matter, physical clay, total salt base and exchange calcium. Based on this, measures such as increasing organic manure, applying alkaline substances such as lime or alkaline fertilizers, such as lime, magnesium and phosphate fertilizers, increasing soil cover, such as returning sugarcane, or adopting contour planting, can increase soil organic matter and exchangeable cation content , Reduce soil clay and cation loss, reduce soil acidity, thereby improving the acid buffer capacity of sugarcane soils and improving the ecological environment of sugarcane soils.