污泥施用对园林土壤磷素有效性的影响  

Influence of sewage sludge application on phosphorus availability in two landscape soils

作　　者：胡超[1] 王朴 李雨锟 付庆灵[1] 胡红青[1] HU Chao;WANG Pu;LI Yu-kun;FU Qing-ling;HU Hong-qing(College of Resource and Environment,Huazhong AgriculturalUniversity,Wuhan Hubei 430070;Institute of Landscape Sciences of Wuhan City,Wuhan Hubei 430064)

机构地区：[1]华中农业大学资源与环境学院,湖北武汉430070 [2]武汉市园林科学研究院,湖北武汉430064

出　　处：《中国土壤与肥料》2024年第11期20-28,共9页Soil and Fertilizer Sciences in China

基　　金：武汉市园林局科研项目(武园林发[2020]22号)。

摘　　要：土壤质量下降和磷素供应不足是限制园林植物正常生长的重要影响因子,城市污泥作为富磷有机物质,可有效改善土壤结构、提升土壤磷素供给能力。然而,目前关于城市污泥施用对不同类型园林土壤的改良作用及磷组分的研究依旧不足。以湖北省武汉市红壤和黄棕壤为研究对象,施用0%、3%、5%、10%、15%的腐熟污泥进行土培试验,通过测定培养前后土壤Hadley磷组分及磷酸酶活性等指标,探究添加污泥对园林土壤磷有效性的影响。结果表明,污泥添加后,土壤pH值向中性变化,且随着污泥施用量的增加,两种土壤的全磷和有效磷含量均呈增加趋势。添加污泥对红壤和黄棕壤的磷组分也有一定影响,添加污泥后,两种土壤中磷均以无机磷为主,主要提高了NaOH-Pi、NaHCO_(3)-Pi和D.HCl-Pi含量;有机磷中提升幅度最大的磷形态为NaOH-Po,且培养60 d后NaHCO_(3)-Po含量明显下降。添加污泥能提升土壤中磷酸酶活性,培养60 d后,添加15%比例的污泥对两种土壤的酸(碱)性磷酸酶活性提升效果最好,其中红壤酸性磷酸酶活性和碱性磷酸酶活性分别提升68.6%和181.8%,黄棕壤中两种酶活性分别提升178.7%和88.9%。施用污泥后园林土壤磷素有效性得到显著提升,土壤中各形态磷素含量和磷酸酶活性均大幅增加。Declining soil quality and insufficient phosphorus supply are important factors that limit the normal growth of garden plants.As phosphorus-rich organic matter,urban sludge can effectively improve soil structure and enhance soil phosphorus supply capacity.However,there is still insufficient research on the improvement effect of urban sludge application on different types of garden soil and its phosphorus components.In this study,the red soil and yellow-brown soil in Wuhan were sampled,and soil culture experiments were carried out by applying 0%,3%,5%,10%,15%of decomposed sludge to explore the effect of sludge addition on soil phosphorus components and phosphatase activity,in order to provide theoretical basis and technical guidance for the efficient utilization of phosphorus resources in sludge and the construction of green and economical gardens.The results showed that after the addition of sludge,the soil pH value changed towards neutral,and as the amount of sludge application increased,the total phosphorus and available phosphorus contents of both soils showed an increasing trend.Adding sludge also had a certain impact on the phosphorus components of red soil and yellow-brown soil.After adding sludge,the phosphorus in both soils was mainly inorganic phosphorus,which mainly increased the contents of NaOH-Pi,NaHCO_(3)-Pi and D.HCl-Pi;The phosphorus form with the greatest increase among organic phosphorus was NaOH-Po,and the NaHCO_(3)-Po content dropped significantly after 60 days of culture.Sludge-adding increased the phosphatase activity in the soil.After 60 days of cultivation,adding 15%sludge had the best effect on improving the acid(alkaline)phosphatase activity of the two soils,among which the acid phosphatase activity of red soil and alkaline phosphatase activity were the best.The activities of the two enzymes in yellow-brown soil increased by 68.6%and 181.8%,respectively,and the activities of the two enzymes in yellow-brown soil increased by 178.7%and 88.9%,respectively.After the application of sewage slu

关 键 词：城市污泥 园林土壤 磷组分 磷酸酶 

分 类 号：S156[农业科学—土壤学] S153.6[农业科学—农业基础科学]