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《Journal of Beijing Forestry University》 2009-03
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Changes of soil fertility in young and middle aged Larix principis-rupprechtii plantations.

LIU Yong~1;LI Guo-lei~1;LIN Ping~1;JIANG Hui~2;YU Hai-qun~1;L Rui-heng~1.1 Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,100083,P.R.China;2 Forestry Station of Longtan Towership,Longtan District of Jilin City,Jilin Province,132022,P.R.China.  
In 2005,the dynamics of soil physiochemical properties and soil enzyme in the soil surface of 0——20 cm depth was manipulated in the 20-and 28-year-old Larix principis-rupprechtii plantations.Changes of soil fertility with forest age were analyzed by a comprehensive evaluation method.The authors found that the soil moisture content,the maximum soil moisture capacity,capillary moisture capacity and non-capillary porosity of the 28-year-old plantations were lower than those of the 20-year-old plantations,while the soil bulk density and capillary porosity of the 28-year-old plantations were higher.With the increase of forest age,the soil pH lowered by 0.10 unit,the content of total N and available K decreased and the content of available P increased slightly.Except for with polyphenol oxidase,the content of soil catalase,invertase,urease and alkaline phosphatase decreased in the 28-year-old in comparison with the 20-year-old plantations.Soil urease,catalase,the maximum soil moisture capacity and non-capillary porosity could be used as indicators to assess the soil fertility.The soil fertility in 20-year-old plantations was more sensitive to forest density and so feasible thinning intensity should be adopted in the plantations as soon as possible.The IFI(integrated fertility index) of the young and middle stands was 0.358 and-0.358,respectively.Therefore,planting L.principis-rupprechtii in a large scale should be cautious.
【Fund】: 国家自然科学基金项目(30471380);; 北京市教委项目(JD100220648)
【CateGory Index】: S158.5
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