不同豆科田菁属(Sesbania spp)绿肥对酸性土壤有机碳含量的影响

摘要

豆科植物是热带、亚热带地区重要的绿肥资源,为了探明我国豆科绿肥的培肥效果,笔者通过田间试验,研究施用7份野生豆科田菁属绿肥后酸性土壤有机碳含量随时间的动态变化.结果表明,施用绿肥后,不同种质绿肥对土壤有机碳含量的影响不同,且不同绿肥对土壤有机质碳含量的影响效果随着施用时间的变化而不断变化;虽然不同田菁绿肥对土壤有机质含量影响的效果不一,但在施用1年内均能显著(P＜0.05)增加土壤有机碳的含量,并在施用1个月后效果最好,但随着时间的延长,土壤有机碳含量不断降低.%Leguminous plant was an important resource of green manures in the tropics and subtropics.Seven accessions of wild Sesbania plant germplasm under legume family were collected from various localities in Hainan,Guangdong and Fujian provinces and were applied as green manure in the soil at different time to observe their dynamic effects on the organic matter content in the acid soil.The results indicated that different Sesbania green manures after application had different effect on the soil organic matter content,which changed with the time of application,but the Sesbania green manures all could increase significantly (P ＜ 0.05) the soil organic matter content after one year of application.The soil organic content continuously decreased with the time of application of the Sesbania green manures.