【摘要】：為揭示耕地退耕成巨桉林后對(duì)土壤抗蝕性的影響,在野外調(diào)查和室內(nèi)分析的基礎(chǔ)上,以紫色土上栽培的6a生巨桉純林、巨桉+果樹、巨桉+糧食作物及農(nóng)耕地土壤作為研究對(duì)象,利用主成分方法分析了影響巨桉林土壤抗蝕性的主要理化指標(biāo),同時(shí)結(jié)合灰色關(guān)聯(lián)度構(gòu)建了抗蝕性指數(shù)—土壤理化性質(zhì)指標(biāo)的耦合模型,對(duì)不同巨桉林的抗蝕性進(jìn)行綜合判定。結(jié)果表明:影響土壤抗蝕性的主要因子有0.25mm團(tuán)聚體含量、容重、有機(jī)質(zhì)、平均重量直徑、水穩(wěn)性指數(shù)、有效鉀、堿解氮,其中0.25mm團(tuán)聚體含量是決定土壤抗蝕性水平的最關(guān)鍵因素;平均重量直徑和水穩(wěn)性指數(shù)與土壤理化性質(zhì)指標(biāo)分別屬于中等和較強(qiáng)關(guān)聯(lián),土壤理化性質(zhì)對(duì)土壤抗蝕性的影響依次為0.25mm團(tuán)聚體含量堿解氮有效磷有機(jī)質(zhì)有效鉀容重;土壤抗蝕性與土壤理化性質(zhì)系統(tǒng)的整體耦合水平屬于弱協(xié)調(diào),系統(tǒng)耦合協(xié)調(diào)程度為巨桉純林(中度協(xié)調(diào))耕地(弱協(xié)調(diào))林糧(輕度不協(xié)調(diào))林果(輕度不協(xié)調(diào))。研究結(jié)論可為耕地退耕成巨桉林地的土壤抗蝕性評(píng)價(jià)提供一定的理論依據(jù)。
[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.
【作者單位】： 內(nèi)江師范學(xué)院地理與資源科學(xué)學(xué)院;
【基金】：四川省教育廳重點(diǎn)項(xiàng)目(16ZA0312);四川省教育廳科研創(chuàng)新團(tuán)隊(duì)基金項(xiàng)目(14TD0026)
【分類號(hào)】：S714.7

【參考文獻(xiàn)】

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本文編號(hào)：2122016