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Received ,Revised , Accepted , Available online

Volume 15,2003,Pages 167-172

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Soil quality is one of the most important environmental factors in sustaining the global biosphere and developing sustainableagricultural practices.A study was initiated in Wolong Nature Reserve, Sichuan Province, China to elucidate the soil quality changes of naturalsecondary succession, forest planting and agricultural practices after deforestation in the humid mountainous region.The soil qualities of six landuse types (natural forestland, grassland, shrub land, secondary forestland, cultivated land and reforested land) were compared using twoquantitative methods: the integrated soil quality index(QI) and soil deterioration index( DI).The QI values of natural forestland, grassland,shrub land, secondary forestland, cultivated land, reforested land were 0.8039, 0.3277, 0.9127, 0.6881, 0.0285 and 0.3183, respectively.The DI values were 0%, - 14%, 12%, 1%, - 26% and - 18% respectively.Both indexes suggested that shrub land can restore soilproperties.To compare the two methods more directly, a deduced index QI' based on QI value was developed.The results showed that DI andQI' had a very high linear correlation coefficient (r = 0.9775) despite the values were different.Both methods were efficient in evaluating thesoil quality levels and DI was a more simple way in soil quality assessment, while QI could show more ecological meanings.

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