Nitrification potentials of Chinese tea orchard soils and their adjacent wasteland and forest soils  

作　　者：XUE Dong GAO Yangmei YAO Huaiying HUANG Changyong 

机构地区：[1]Zhejiang Provincial Key Laboratory of Subtropic Soil and Plant Nutrition, College of Environmental and Resource Sciences, Zhejiang University (Huajiachi Campus), Hangzhou 310029, China. [2]Department of Environmental and Chemical Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China

出　　处：《Journal of Environmental Sciences》2009年第9期1225-1229,共5页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.30671207,30871600);Zhejiang Provincial National Natural Science Foundation of China(No.Y5080067);the Doctoral Scientific Research Foundation of Luoyang Institute of Science and Technology(No.2008BZ04)

摘　　要：To investigate the nitrifying activities of different soil types, soil samples collected from 8-, 50- and 90-year old tea orchards, the adjacent wasteland, and 90-year old forest were measured for their nitrification potentials using the conventional soil incubation and the liquid incubation method. Among different soil types, the nitrification potential of soil in tea orchards was higher than that of wasteland and forest soils. The slurry shaken liquid incubation method was confirmed to be more accurate and have reliable results than the soil incubation. Interestingly, experimental result revealed that the generally applied pH value of 7.2 for the liquid media was not the optimal pH for these acid soils with a strong buffer capacity. This suggested that tea orchard soils may have nitrifiers requiring pHneutral condition for the best activity. Our data also showed that treatment with the commonly used nitrogen fertilizer urea significantly improved nitrification potential of the soils; such enhancement effect was stronger on all of three tea orchard soils than on wasteland and forest soils, and also stronger on the younger （8- and 50-year old） tea orchard soils than on the older one （90-year old）.To investigate the nitrifying activities of different soil types, soil samples collected from 8-, 50- and 90-year old tea orchards, the adjacent wasteland, and 90-year old forest were measured for their nitrification potentials using the conventional soil incubation and the liquid incubation method. Among different soil types, the nitrification potential of soil in tea orchards was higher than that of wasteland and forest soils. The slurry shaken liquid incubation method was confirmed to be more accurate and have reliable results than the soil incubation. Interestingly, experimental result revealed that the generally applied pH value of 7.2 for the liquid media was not the optimal pH for these acid soils with a strong buffer capacity. This suggested that tea orchard soils may have nitrifiers requiring pHneutral condition for the best activity. Our data also showed that treatment with the commonly used nitrogen fertilizer urea significantly improved nitrification potential of the soils; such enhancement effect was stronger on all of three tea orchard soils than on wasteland and forest soils, and also stronger on the younger （8- and 50-year old） tea orchard soils than on the older one （90-year old）.

关 键 词：tea orchard WASTELAND forest nitrification potential UREA 

分 类 号：S153[农业科学—土壤学] S714.2[农业科学—农业基础科学]