| 摘要: |
| 引进更新树种并形成混交林是改造人工纯林、避免因长期连栽而导致土壤退化的最优途径，而混交能否成功的关键是树种之间的关系是否协调。为了指导四川岷江上游地区人工纯林的改造，以当地具有典型代表性的4种人工纯林为研究对象，进行了林地腐殖质层土壤及其凋落叶的针阔混合室内培养试验。结果表明，云南松（Pinus yunnansinsis）林地土壤与连香树（Cercidiphyllum japonicum）或桦树（Betula platyphylla）林地土壤混合后，可提高土壤酶活性，土壤微生物C、N含量及土壤有机C和全N的含量；而云杉（Piceaas perata）林地土壤与连香树或桦树林地土壤混合后，以上各项指标提高不明显或略有降低。说明从土壤生物化学的角度出发，云南松与连香树或桦树的种间协调性优于云杉与连香树或桦树的种间关系，所以建议当地营造云南松与连香树或桦树混交林，而且混交的比例以云南松和连香树1：1～1：3、云南松和桦树1：1～3：1为佳。 |
| 关键词: 阔叶林 针叶林 人工纯林 混合培养试验 种间关系 土壤生物化学性质 |
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| 基金项目:国家自然科学基金项目(30471376);西北农林科技大学2005年人才计划项目；中科院成都生物研究所2003年开放实验室基金项目 |
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| Effects of soil mix-incubation of 4 species artificial forests with litters on the biochemical characteristics |
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| Abstract: |
| Old or many times regenerated artificial pure forest will lead to imbalance of nutrients and degeneration of its soil due to the trees selective absorption and utilization of nutrients.One of the best solutions of this problem is to introduce new tree species and transform the pure forest into mixture,so as to produce mutual compensative effects.In order to direct the selection of species of mix forestation,experiments of incubation in laboratory were carried out by mixing different soils (with its litters) of Cercidiphyllum japonicum,Betula platyphylla,Pinus yunnansinsis and Picea asperata forests,in the catchments of upper reach of Mingjiang River in Sichuan Province.The biochemical properties of the mixed soils were measured periodically.According to the results, mixing soils (with litters )of P.yunnansinsis and C.japonicum or B.platyphylla can increase enzyme activities,micro biomass C and N,organic C and total N of soil to different extents，respectively.In contrast,mixing of soils (with litters) of P.asperata and C.japonicum or B.platyphylla has no this effect or even decreases the biochemical indices.This means that,from a biochemical perspective,the interspecific relationships between P.yunnansinsis and C.japonicum or B.platyphylla are more friendly than that between P.asperata and C.japonicum or B.platyphylla.So it is suggested that mix forests of P.yunnansinsis and C.japonicum or B.platyphylla with the ratios of 1∶1-1∶3 or 1∶1-3∶1 should be planted in this area. |
| Key words: deciduas forest coniferous forest artificial pure forest mix-incubation experiment interspecific relationship biochemical properties of soil |
