Effects of Fertilization on Soil Enzyme Activities and Its Role in Adjusting-Controlling Soil Fertility of Young Azadirachta indica A.Juss.Plantations
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1.
Research Institute of Resources Insects, CAF, Yuanmou Desert Ecosystem Research Station of the State Forestry Administration, Kunming 650224, Yunnan, China
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2.
International Centre for Bamboo and Rattan, Beijing 100102, China
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3.
Research Institute of Forest Ecology, Environment and Protection, CAF, Beijing 100091, China
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Received Date:
2006-05-15
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Abstract
To search the correlation between soil enzyme activities and soil fertility under fertilization conditions,the indexes of soil enzyme,soil chemical property and soil microbes in 3-years Azadirachta indica plantation were detected and analyzed in Yunnan Yuanmou Desert Ecosystem Located Research Station of State Forestry Administration.The results were as follows:(1) The application of N、P、K fertilizers combined with organic manure(treatment 9) was the best way to strengthen young plantation soil enzyme activities,while,for increase soil chemical properties and soil microbes quantities,treatment 6 was the best one,and the effect of treatment 8 to improve soil pH was the best one.(2) The correlation between soil enzyme activities and soil fertility indexes was significant.The activities of sucrase and catalase were respectively significantly correlated with hydrolytic nitrogen and available phosphorus at the 0.01 level.The positive correlation of acid phosphatase activity with the contents of hydrolytic nitrogen,exchangeable calcium and exchangeable magnesium,and sucrase activity with the content of organic matter,were significant.the negative correlation of urease activity with soil pH and bacteria amount,and acid phosphatase activity with the content of available iron were also found prominently.While the correlation between the protease and polyphenol oxidase and soil fertility indexes was not obvious.In addition,except protease,activities of many correlation coefficients of soil enzyme activity and others soil fertility indexes were more than 0.5,and indicated that the soil enzyme activities could be use to evaluate the soil fertility of Azadirachta indica plantations in this area.
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