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4种改良材料对城市绿地酸性土壤的改良效果
苏杨, 张俊涛, 李铤, 梁春梅
广州市林业和园林科学研究院
摘要:
针对部分城市绿地土壤偏酸的问题,研究选用生石灰、磷矿粉、园林废弃物堆肥、生物炭 4 种改良材料,分别设置 3 个梯度( 40、 80、 160 g · kg -1)的添加量,开展室内土培试验。通过监测土壤 pH 值、 EC 值、有效磷、速效钾、有机质的动态变化,研究 4 种改良材料对偏酸土壤的改良效果。结果 表明, 4 种材料对酸性土壤的 pH 值均有显著的提升效果。在相同剂量下,提升效果依次为:生石灰 > 磷 矿粉 > 园林废弃物堆肥 > 生物炭,且改良效果均可以维持 170 d 以上。 4 种材料在改善土壤 pH 值的同时, 还能有效提升土壤中有效磷的含量,其中生石灰提升效果最为显著。生物炭和园林废弃物堆肥能同时有 效提升土壤速效钾和有机质的含量,高添加量的生石灰甚至会降低土壤速效钾和有机质的含量。
关键词:  城市绿地  酸性土壤  生石灰  磷矿粉  园林废弃物堆肥  生物炭
DOI:
分类号:
基金项目:2019年广州市公共服务类地方标准制定项目;广州市林业和园林局预算项目(2061900000139)
Effects of Four Amendments on Acidic Soils of Urban Green Space
su yang, zhang jun tao, li ting, liang chun mei
Guangzhou Institute of Forestry and Landscape Architecture
Abstract:
In order to ameliorate the soil acidification of some urban green space, a series of pot experiments were carried out in this study. Four amendments, i.e., quicklime, phosphate rock, garden waste compost, and biochar, with different gradients (40, 80, and 160 g · kg -1) were applied. The effects of four amendments were obtained according to the dynamic changes of pH, electrical conductivity (EC), available phosphorus, available potassium, and organic matter of acidic soils. The results showed that the four amendments application significantly improved the soil pH. Under the same dosage, the order of improving effect was as follows: quicklime > phosphate rock >green waste compost > biochar. The effect of the amendments on the pH improvement could be maintained for more than 170 days. It suggested that the amendments could not only improve the soil pH, but also effectively increase the content of available phosphorus in soils, among which effect of quicklime was particularly significant. Moreover, biochar and garden waste compost could effectively improve the contents of available potassium and organic matter at the same time, however high dosage of quicklime could even reduce these contents in soils.
Key words:  urban green space  acidic soils  quicklime  phosphate rock  garden waste compost  biochar