不同土地利用方式对干热河谷地区土壤酶活性的影响

doi:10.3864/j.issn.0578-1752.2011.18.008

Abstract

Abstract: 【Objective】 The study of soil enzyme activity on land use is of importance for exploration of the soil quality evolution and its evaluation during the revegetation in Jinsha river dry-hot valley region. 【Method】 Seven kinds of land use types with the same altitude at valleys in downstream of Jinsha river in Ningnan county, Sichuan was chosen as subject, aiming at reveal the changes in soil enzyme activity under wet/dry alternate conditions through experimental and statistical analysis. 【Result】 The results showed that different land use types significantly influenced the enzyme activity. Soil urease, saccharase, phosphatase, cellulose behaved the same change. Compared to other land use, a higher enzyme was found in Camptotheca acuminata, followed by grassland and Albizzia julibrissin, the lowest in Zanthoxylum bungeanum, Zea mays, Saccharum sinense and Morus alba. No significant change was observed in catalase activity and the lower value was found in Zea mays, Morus alba, Saccharum sinense than other land use. Different changes were observed in polyphenol oxidase from other enzymes, and the Morus alba and Albizzia julibrissin corresponded the highest value. With a exception of polyphenol oxdiase, enzymes with the same land use at wet season were higher than that in dry season. Correlation analysis showed a significant relation among saccharase, urease, phosphatase, and catalase, also related with soil fertility indicators, therefore soil enzyme could be useful for reflecting soil fertility. Soil enzyme index（SEI）can objectively and fully evaluate the change in soil enzyme, the SEI changed with an order of Camptotheca acuminata > Albizzia julibrissin >grassland> Zea mays > Zanthoxylum bungeanum > Saccharum sinense > Morus alba, and the SEI in wet season was higher than dry season. 【Conclusion】 The significant difference was observed in different land use types owing to special factors such as framing environment and species composition. In order to realize the healthy development in dry-hot valley, the soil enzyme change should be taken into conderation and the land use with rare disturbance and rich species should be chosen.

Key words:

dry-hotvalley, landuse, enzymeactivity

XUE Sha, LI Zhan-Bin, LI Peng, ZHENG Yu. Effect of Land Use on Soil Enzyme Activity in Dry-Hot Valley[J].Scientia Agricultura Sinica, 2011, 44(18): 3768-3777.

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Effect of Land Use on Soil Enzyme Activity in Dry-Hot Valley

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