改良剂对旱地红壤pH和有效P含量的影响

A study on effects of amendments on soil pH and available phosphorus of upland red soil

针对我国南方红壤旱地酸性强,有效P含量低的问题,研究改良剂（生物质炭与过氧化钙）对旱地红壤pH和有效P含量的影响.结果表明施用生物质炭与过氧化钙后,土壤pH得到不同程度的提高,有效磷含量增大,生物质炭与过氧化钙配施效果优于单施,其中C1Ca1（生物质炭758 kg/hm2和过氧化钙61 kg/hm2）处理效果最好,各处理在0~40 cm土层土壤有效P与pH呈显著相关性.

Upland red soil in Southern China is usually found to be high in acidity and low in the content of available phosphorus. Therefore,this paper conducts an experiment to study the effect of soil modifiers （biochar and calcium peroxide）on soil pH and soil available phosphorus. The results show that soil pH rises to different degrees and the contents of available phosphorus are increased after the application of biochar and calcium peroxide,and the best effect is obtained from the combined application of both ingre-dients,with C1Ca1（biomass char 758 kg / hm2 and calcium peroxide 61 kg / hm2 ）being the best treat-ment. Under the application of amendments,soil available phosphorus has a significant correlation with the soil pH in 0 - 40 cm soil.