生石灰用量对早竹林土壤酸碱度及有效态重金属含量的影响

摘要

Selection of degraded Phyllostachys violascens stands was implemented in April of 2016 in Yuhang, Zhejiang province for establishing 12 sample plots by randomized block design. Treatments of application of CaO were carried out with 0(ck), 1500, 4500 and 7500 kg/ha. pH and heavy metal content in the soil was determined in November. The result demonstrated that application of CaO could increase pH and decrease exchangeable acid (P<0.05). Compared with the control, pH of soil treated by CaO increased 0.21-0.60, exchangeable acid, H+ content and Al3+ content decreased by 10.3%-32.2%, 13.5%-32.2% and 9.8%-31.3%. Application of CaO could evidently decreased Zn, Cu, Pb and Cd content by 13.4%-40.5%, 23.4%-49.0%, 26.2%-55.0% and 3.4%-46.8%.%2016年4月,在浙江省余杭区选择3块相邻的退化早竹Phyllostachys violascens林地,采用随机区组设计,建立12个10 m×10 m的小区,设置0(CK),1500,4500,7500 kg·hm-2生石灰用量处理.施用后7个月,测定不同生石灰用量对林地土壤酸碱度及有效态重金属含量的影响.结果表明,生石灰的施入显著提高了土壤pH、降低了土壤交换性酸含量(P<0.05).与对照相比,土壤pH分别提高了0.21~0.60个单位,土壤交换性酸总量、H+含量和Al3+含量,分别下降了10.3%~32.2%,13.5%~32.2%,9.8%~31.3%.生石灰的施用显著降低了土壤有效态重金属的含量(P<0.05),有效态重金属Zn,Cu,Pb,Cd的含量分别降低了13.4%~40.5%,23.4%~49.0%,26.2%~55.0%,3.4%~46.8%.