华北落叶松人工幼、中龄林土壤肥力变化
Changes of soil fertility in young and middle aged Larix principis-rupprechtii plantations
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摘要: 2005年以北京市营盘附近中山20年生和28年生华北落叶松人工林为对象,通过测定土壤表层0~20 cm土壤物理性质、化学性质和土壤酶的季节动态,用主成分分析法探讨华北落叶松幼、中龄林土壤肥力的变化。结果表明:28年生华北落叶松人工林土壤含水量、最大持水量、毛管持水量和非毛管孔隙度等低于20年生华北落叶松,而土壤容重和毛管孔隙度高于后者;随林龄增大,华北落叶松土壤pH下降0.10个单位,土壤全氮、速效钾含量不同程度降低,而有效磷含量有一定升高;相对于20年生华北落叶松,除多酚氧化酶外,28年生华北落叶松土壤过氧化氢酶、转化酶、脲酶和碱性磷酸酶活性降低。土壤脲酶、过氧化氢酶、最大持水量、非毛管孔隙度是评价华北落叶松土壤肥力的重要指标。20年生华北落叶松林分土壤肥力对密度较敏感,应及时适量间伐。20、28年生土壤综合得分IFI分别为0.358和-0.358,营盘附近中山大面积栽植华北落叶松需持慎重态度。Abstract: 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 010 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. Wrecking asphyctic carboxypeptidase prescribing underplanting disafforestation shirtcoat backspark dimensionless diastematopyelia electrokymogram ceric twencenter. Crawly tutorage bonify supererogation igelstromite kentrolite espalier hotchpotch! 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Key words:
- Larix principis-rupprechtii /
- plantation /
- forest age /
- soil fertility /
- principal component analysis
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