Short-term effects of sewage sludge application on phosphatase activities and available P fractions in Mediterranean soils

被引:49
作者
Criquet, Steven [1 ]
Braud, Armelle [1 ]
Neble, Sylvie [1 ]
机构
[1] Fac Sci & Tech St Jerome, Inst Mediterraneen Ecol & Paleoecol, CNRS, UMR 6116,Lab Microbiol,Serv 452, F-13397 Marseille 20, France
关键词
P Olsen; P recycling; P water; phosphodiesterases; phosphomonoesterases; soil fertility;
D O I
10.1016/j.soilbio.2006.11.002
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The aim of this study was to investigate factors regulating phosphatase activities in Mediterranean soils subjected to sewage sludge applications. Soils originating from calcareous and siliceous mineral parent materials were amended with aerobically digested sewage sludge, with or without physico-chemical treatment by ferric chloride. Sludge amendments, ranging from 6.2 to 10 g kg(-1) soil, were carried out in order to provide soil with a P total quantity equivalent to 0.5 g P2O5 per kg of soil. Bacterial density, phosphatase activities (i.e. acid and alkaline phosphomonoesterases and phosphodiesterases) and available P (i.e. P Olsen and P water) were measured after 25 and 87 days of incubation. Results showed significant effects of sewage sludge application and incubation period. Sewage sludge effect resulted in an increase in phosphatase activities, microbial density and available P. Incubation period increased available P while decreasing phosphatase activities. This study also revealed that the origin of sludge and its chemical characteristics may show different effects on certain variables such as phosphodiesterases or bacterial density, whereas mineral parent materials of soils did not show any significant effects. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:921 / 929
页数:9
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