三峡库区脐橙园土壤养分、酸度变化特征与施肥管理对策——以秭归县水田坝乡为例
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中国科学院西部行动计划


Characteristics of Soil Nutrients and Acidity and Fertilization Management of Hillside Orange Gardens in Three Gorges Region——A Case Study of Shuitianba Town, Zigui City
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    摘要:

    通过对三峡库区脐橙产业分布典型区域脐橙园土壤养分含量和酸度指标的系统调查,分析了三峡库区脐橙园土壤有机质和主要大量元素、微量元素含量状况和土壤酸碱度现状,进一步采用相关性和主成份分析法,揭示了土壤有机质、主要大量养分元素变化与土壤酸化过程的相互关系。结果表明,该区域三峡库区紫色砂岩分布区脐橙园土壤有机质含量分布不均、多数处于较低水平,且具有缺 N、低 P、富 K 的特点;土壤速效态N、P、K含量差异较大,65% 土壤有效态 N 缺乏,45%左右土壤速效P、K含量偏低;有效 Zn 缺乏的土壤占有较高比例;随着脐橙种植年限的增加,土壤有效态养分含量呈提高的趋势,但是,由于化学肥料的长期过量施用,土壤酸化趋势明显,如果不采取合理的对策,容易引起土壤退化。采用“增库、调流”措施,合理调整有机、无机肥的比例,结合叶片诊断补充微量元素,利用秸秆进行园地覆盖,套种饲草,施用石灰、磷矿粉、煤渣类土壤改良剂,是改善土壤结构、协调土壤养分供应、缓解土壤酸化的重要措施。

    Abstract:

    An investigation was conducted from 2005 to 2006 on soil nutrients contents and acidity for hillside orange garden in Shuitianba Town in the Three Gorges Region. Soil organic matter content, total nutrients contents (N, P and K), available nutrients contents (N, P, K, Zn, Fe, Mn and Cu) and soil acidity (pH, exchangeable acidity) were analyzed and elucidated, the correlations between the available macro-element contents and soil pH were revealed. The results showed that a great uneven distribution of soil nutrients and soil organic matter, attributed to the great slope degree, the intensive cultivation in the last century, the complexity of parent material distribution, and the current soil fertilization. The deficiency of organic matter, total N and P, and abundance of total K, about 65% of the sampled soil deficient in available N, 45% deficient in available P and K, and 45% deficient in available Zn. With the increase of continuous orange cultivation year, continuous fertilization increased soil available nutrients contents but enhanced soil acidification, therefore, suitable measures in fertilization should be taken to prevent soil deterioration.

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韩庆忠.三峡库区脐橙园土壤养分、酸度变化特征与施肥管理对策——以秭归县水田坝乡为例[J].土壤,2008,40(4):602-607. HAN Qing-zhong. Characteristics of Soil Nutrients and Acidity and Fertilization Management of Hillside Orange Gardens in Three Gorges Region——A Case Study of Shuitianba Town, Zigui City[J]. Soils,2008,40(4):602-607

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