热带农业废弃物对橡胶园土壤酸度的影响

摘要

[目的]研究热带农业废弃物对橡胶园土壤酸度的影响,为利用农业废弃物延缓和修复土壤酸化提供理论依据.[方法]用室内培养试验(25℃恒温培养70 d)研究在橡胶园土壤中分别添加15和45 g/kg椰糠、香蕉假茎、橡胶木屑、蔗渣4种农业废弃物,对橡胶园土壤pH、交换性酸、交换性盐基、无机氮含量的影响,以不添加任何农业废弃物为对照.[结果]添加量为15和45 g/kg时,4种农业废弃物处理土壤pH的变化趋势基本一致,除椰糠外,香蕉假茎、橡胶木屑、蔗渣均可明显提高土壤pH,其对土壤pH的提升效果表现为香蕉假茎＞橡胶木屑＞蔗渣＞椰糠.香蕉假茎、橡胶木屑、蔗渣均降低了土壤交换性酸和交换性铝含量,而椰糠提高了土壤交换性酸含量.添加量为15和45 g/kg时,4种农业废弃物均增加了土壤交换性盐基总量.[结论]添加量为45 g/kg时,4种农业废弃物对橡胶园土壤酸度的影响较大,其影响大小顺序为香蕉假茎＞橡胶木屑＞蔗渣＞椰糠.%[Objective] The effects of tropical agricultural wastes on soil acidity of rubber plantation were studied to provide theoretical basis for delaying and repairing soil acidity using tropical agricultural wastes.[Method] The effects of coco coir(CC),banana pesudostem (BPS),rubber wood chips (RWC) and cane trash (CT) under two levels of 15 g/kg and 45 g/kg on pH,exchangeable acidity,exchangeable base,and inorganic nitrogen in rubber plantation soil were studied using constant incubation experiment at temperature of 25 ℃ for 70 days.No addition of agricultural waste was used as control.[Result] The change of soil pH was consistent with different agricultural wastes at the levels of 15 and45 g/kg.BPS,RWC and CT except CC significantly increased pH with the order of BPS＞RWC＞CT＞CC.BPS,RWC and CT decreased contents of soil exchangeable acidity (EA) and aluminum (E-Al),while CC increased EA contents.Contents of exchangeable base ions(E-BI) were increased by all wastes.[Conclusion] The influence of agricultural wastes on soil acidity was great at level of 45 g/kg,and the order of f improving effects on soil acidity were BPS＞RWC＞CT＞CC.