不同巨桉林下紫色土壤抗蚀性与土壤因子的耦合关系分析
发布时间：2018-07-14 14:59
【摘要】：为揭示耕地退耕成巨桉林后对土壤抗蚀性的影响,在野外调查和室内分析的基础上,以紫色土上栽培的6a生巨桉纯林、巨桉+果树、巨桉+粮食作物及农耕地土壤作为研究对象,利用主成分方法分析了影响巨桉林土壤抗蚀性的主要理化指标,同时结合灰色关联度构建了抗蚀性指数—土壤理化性质指标的耦合模型,对不同巨桉林的抗蚀性进行综合判定。结果表明:影响土壤抗蚀性的主要因子有0.25mm团聚体含量、容重、有机质、平均重量直径、水稳性指数、有效钾、碱解氮,其中0.25mm团聚体含量是决定土壤抗蚀性水平的最关键因素;平均重量直径和水稳性指数与土壤理化性质指标分别属于中等和较强关联,土壤理化性质对土壤抗蚀性的影响依次为0.25mm团聚体含量碱解氮有效磷有机质有效钾容重;土壤抗蚀性与土壤理化性质系统的整体耦合水平属于弱协调,系统耦合协调程度为巨桉纯林(中度协调)耕地(弱协调)林粮(轻度不协调)林果(轻度不协调)。研究结论可为耕地退耕成巨桉林地的土壤抗蚀性评价提供一定的理论依据。
[Abstract]:In order to reveal the effect of farmland conversion to eucalyptus grandis forest on soil erosion resistance, on the basis of field investigation and indoor analysis, 6 year old pure eucalyptus grandis forest and eucalyptus grandis fruit tree were cultivated on purple soil. The soil of eucalyptus grandis was studied. The main physical and chemical indexes affecting soil erosion resistance of Eucalyptus grandis forest were analyzed by principal component method. At the same time, the coupling model of anti-erodibility index and soil physical and chemical property index was constructed by combining grey correlation degree, and the anti-erodibility of different Eucalyptus grandis forest was evaluated synthetically. The results showed that the main factors affecting soil corrosion resistance were 0.25mm aggregate content, bulk density, organic matter, mean weight diameter, water stability index, available potassium, alkali-hydrolyzed nitrogen. The content of 0.25mm aggregate is the most important factor to determine the level of soil erosion resistance, and the average weight diameter and water stability index belong to moderate and strong correlation with soil physical and chemical properties, respectively. The effect of soil physical and chemical properties on soil corrosion resistance was followed by the content of 0.25mm aggregates, the available K bulk density of organic matter of available phosphorus, and the weak coordination between soil erosion resistance and soil physical and chemical properties system. The degree of system coupling coordination was that of pure Eucalyptus grandis forest (moderate coordination) cultivated land (weak coordination) forest and grain (light disharmony) forest and fruit (slight disharmony). The results can provide a theoretical basis for the evaluation of soil erosion resistance of cultivated land to Eucalyptus grandis.
【作者单位】： 内江师范学院地理与资源科学学院;
【基金】：四川省教育厅重点项目(16ZA0312);四川省教育厅科研创新团队基金项目(14TD0026)
【分类号】：S714.7
[Abstract]:In order to reveal the effect of farmland conversion to eucalyptus grandis forest on soil erosion resistance, on the basis of field investigation and indoor analysis, 6 year old pure eucalyptus grandis forest and eucalyptus grandis fruit tree were cultivated on purple soil. The soil of eucalyptus grandis was studied. The main physical and chemical indexes affecting soil erosion resistance of Eucalyptus grandis forest were analyzed by principal component method. At the same time, the coupling model of anti-erodibility index and soil physical and chemical property index was constructed by combining grey correlation degree, and the anti-erodibility of different Eucalyptus grandis forest was evaluated synthetically. The results showed that the main factors affecting soil corrosion resistance were 0.25mm aggregate content, bulk density, organic matter, mean weight diameter, water stability index, available potassium, alkali-hydrolyzed nitrogen. The content of 0.25mm aggregate is the most important factor to determine the level of soil erosion resistance, and the average weight diameter and water stability index belong to moderate and strong correlation with soil physical and chemical properties, respectively. The effect of soil physical and chemical properties on soil corrosion resistance was followed by the content of 0.25mm aggregates, the available K bulk density of organic matter of available phosphorus, and the weak coordination between soil erosion resistance and soil physical and chemical properties system. The degree of system coupling coordination was that of pure Eucalyptus grandis forest (moderate coordination) cultivated land (weak coordination) forest and grain (light disharmony) forest and fruit (slight disharmony). The results can provide a theoretical basis for the evaluation of soil erosion resistance of cultivated land to Eucalyptus grandis.
【作者单位】： 内江师范学院地理与资源科学学院;
【基金】：四川省教育厅重点项目(16ZA0312);四川省教育厅科研创新团队基金项目(14TD0026)
【分类号】：S714.7
【参考文献】
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