Addition of Urban Waste to Semiarid Degraded Soil:Long-term Effect  

作　　者：F.BASTIDA J.L.MORENO C.GARC■A T.HERNNDEZ 

机构地区：[1]Department of Soil and Water Conservation Centro de Edafologia y Biologia Aplicada del Segura (CEBAS-CSIC),Campus Universitario de Espinardo,30100 Espinardo,Murcia (Spain).

出　　处：《Pedosphere》2007年第5期557-567,共11页土壤圈（英文版）

基　　金：Project supported by the EU and the Spanish Ministry of Science and Technology.

摘　　要：The addition of municipal solid wastes （MSW） is considered as a possible strategy for soil rehabilitation in southeast Spain. The objective of this study was to evaluate the long-term （17 years） effect of five doses of MSW addition on the microbiological, biochemical, and physical properties of semiarid soil. Increased values of several parameters that serve as indicators of general microbiological activity, such as, basal respiration, adenosine triphosphate （ATP） or dehydrogenase activity; microbial population size （microbial biomass C）, and extracellular hydrolase activity related to macronutrient cycles, such as, urease, 3-glucosidase, and N-a-benzoyl-L-argininamide protease, were observed in the amended soils. The highest MSW doses showed the highest values in these hydrolase activities. The incorporation of municipal waste resulted in a more dense development of the plant cover, 50% greater in higher doses than in the control treatment, which generated a substantial increase in several C fractions. Total organic carbon reached 12 g kg^-1 soil with the highest MSW doses, compared to 4.30 g kg^-1 soil in the control treatment. The physical properties of the soil were also improved, showing greater percentage of stable aggregates and water holding capacity. Positive correlation coefficients between C fractions and parameters related to microbial activity and aggregate stability were observed. Although these improvements were greater in the soils receiving the highest doses of organic amendment, the increases were not proportional to the amount added, demonstrating the existence of a threshold, above which an increase in the amount of organic matter added is not reflected in an increase in the soil＇s physical, biochemical, and microbiological properties. However, the addition of municipal solid wastes proved its suitability for improving soil quality, thereby indicating the potential of such an amendment, to prevent desertification in Mediterranean areas such as those studied.The addition of municipal solid wastes (MSW) is considered as a possible strategy for soil rehabilitation in southeast Spain.The objective of this study was to evaluate the long-term (17 years) effect of five doses of MSW addition on the microbiological,biochemical,and physical properties of semiarid soil.Increased values of several parameters that serve as indicators of general microbiological activity,such as,basal respiration,adenosine triphosphate (ATP) or dehydrogenase activity;microbial population size (microbial biomass C),and extracellular hydrolase activity related to macronutrient cycles,such as,urease,β-glucosidase,and N-α-benzoyl-L-argininamide protease,were observed in the amended soils.The highest MSW doses showed the highest values in these hydrolase activities.The incorporation of municipal waste resulted in a more dense development of the plant cover,50% greater in higher doses than in the control treatment,which generated a substantial increase in several C fractions.Total organic carbon reached 12 g kg^(-1) soil with the highest MSW doses, compared to 4.30 g kg^(-1) soil in the control treatment.The physical properties of the soil were also improved,showing greater percentage of stable aggregates and water holding capacity.Positive correlation coefficients between C fractions and parameters related to microbial activity and aggregate stability were observed.Although these improvements were greater in the soils receiving the highest doses of organic amendment,the increases were not proportional to the amount added,demonstrating the existence of a threshold,above which an increase in the amount of organic matter added is not reflected in an increase in the soil's physical,biochemical,and microbiological properties.However,the addition of municipal solid wastes proved its suitability for improving soil quality,thereby indicating the potential of such an amendment,to prevent desertification in Mediterranean areas such as those studied.

关 键 词：enzyme activities long-term effect microbial biomass C municipal solid waste RESPIRATION 

分 类 号：X705[环境科学与工程—环境工程]