杉木林改造前后的土壤肥力对比分析及综合评价

发布时间：2018-07-07 21:31

本文选题：杉木林 + 土壤肥力　；参考：《土壤通报》2016年05期

【摘要】：基于福寿林场3个龄组杉木(Cunninghamia lanceolata)生态公益林9块固定样地的实测数据,选用土壤有机质、全氮、全磷、碱解氮、有效磷、速效钾、土壤容重和pH值8个指标对杉木林改造前后的土壤肥力进行了对比分析,并基于乘除法原理提出了土壤肥力综合评价指数和评价等级。结果表明:与改造前相比,改造后3个龄组杉木生态公益林0~20 cm表层土壤的有机质、全氮、全磷、碱解氮、有效磷、速效钾的含量都有不同程度的提高,且杉木幼、中林提高程度更明显,改造后的杉木幼、中龄林的土壤容重略有下降,pH值略有增加,但杉木近熟林的土壤容重和pH值基本保持没变。说明补植了阔叶树种栾树(Koelreuteria bipinnata)和马褂木(Liriodendron tulipifera)的杉木幼龄林和补植了阔叶树种栾树、马褂木和深山含笑(Michelia maudiae)的杉木中龄林土壤质量的改善程度明显优于在林下补植了红豆杉(Taxus chinensis)的杉木近熟林,通过树种结构调整改造后的3个龄组杉木林土壤肥力综合评价指数值也有不同程度的提高,土壤肥力质量从差变为较差。相比传统的土壤肥力综合评价指标,本文提出的土壤肥力综合评价指数不需要计算指标权重,计算量小,而且可以根据不同的土壤系统,对模型参数的个数适当增减,适用性较强。
[Abstract]:Soil organic matter, total nitrogen, total phosphorus, alkali-hydrolyzed nitrogen, available phosphorus and available potassium were selected based on the measured data of 9 plots of ecological public welfare forest of Cunninghamia lanceolata in Fushou Forest Farm. The soil fertility before and after the transformation of Chinese fir forest was compared and analyzed with 8 indexes of soil bulk density and pH value, and the comprehensive evaluation index and grade of soil fertility were put forward based on the principle of multiplication and division. The results showed that the contents of organic matter, total nitrogen, total phosphorus, alkali-hydrolyzed nitrogen, available phosphorus and available potassium in the topsoil of three groups of Chinese fir (Cunninghamia lanceolata) were increased in different degrees, and the young of Chinese fir. The soil bulk density of middle age forest decreased slightly and pH value increased slightly, but the soil bulk density and pH value of Chinese fir near mature forest remained unchanged. The results showed that young Chinese fir forests with broad-leaved species Koelreuteria bipinnata and Liriodendron tulipifera and broad-leaved species Luan trees were replanted. The soil quality improvement of Chinese fir (Cunninghamia lanceolata) and Chinese fir (Cunninghamia lanceolata) was significantly better than that of Chinese fir (Cunninghamia lanceolata) replanted with Taxus chinensis under the forest. The comprehensive evaluation index value of soil fertility of three age groups of Chinese fir forest after tree structural adjustment and transformation also increased to some extent, and the soil fertility quality changed from poor to poor. Compared with the traditional comprehensive evaluation index of soil fertility, the comprehensive evaluation index of soil fertility proposed in this paper does not need to calculate the index weight, and the amount of calculation is small, and the number of model parameters can be increased or decreased according to different soil systems. The applicability is strong.
【作者单位】：中南林业科技大学林学院;南方林业生态应用技术国家工程实验室;
【基金】：“十二五”国家科技支撑计划专题(2012BAD22B0505) 中南林业科技大学青年基金重点项目(QJ2012013A)资助
【分类号】：S714.8

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