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| Effects of pure Larix olgensis plantation improvement on the soil properties |
| Wang Shuli,Shen Haiyan,Sun Yue,Zhou Yanyang |
| Forestry Academy,Northeast Forestry University,150040,Harbin,China |
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Abstract Physical properties,nutrient status and microorganism amount of the soil were studied after pure Larix olgensis plantation was changed to mixed plantation in Linkou Forest Bureau of Heilongjiang Province.The results showed that the difference of soil bulk density and soil total porosity of Fraxinus belt,Larix-Fraxinus belt,Larix belt,Larx-Juglans belt and Juglans belt was not significant,but that of different soil layer in the same plantation belt was significant,and the value reduced with soil layer decline.The amount of soil organic matter,total nutrient elements and available nutrient elements reduced with soil layer decline except total K.The nutrient amount of hardwood belt and mixed belt was higher than that of Larix olgensis belt,the amount of total N,total P and total K in soil layer of 0-10 cm increased maximum 13.99%,8.00% and 11.23%,and available N,available P and available K in soil layer of 0-10 cm increased maximum 18.84%,12.37% and 6.71% respectively.Most part of microorganism distributed in the soil layer of 0-20 cm,and their amount reduced with soil layer decline.The amount difference of total microorganism,bacterial,fungus and actinomycetes of different belt plantation was significant,of which the decline order of total microorganism amount was Fraxinus belt,Larix-Fraxinus belt,Larix-Juglans belt,Juglans belt and Larix belt.Study results would provide a scientific base for Larix olgensis pure plantation improvement.
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Received: 01 November 2008
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