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首页> 外文期刊>Land Degradation and Development >Effects of soil conservation on soil properties of citrus orchards in the Three-Gorges Area, China
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Effects of soil conservation on soil properties of citrus orchards in the Three-Gorges Area, China

机译：水土保持对三峡库区柑桔园土壤性质的影响

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摘要

Mountain region citrus production systems occupy large parts of the landscape prone to soil erosion in the Three-Gorges Area of China. Several soil conservation measures, such as terracing hedgerows, are widely implemented in citrus orchards to control soil erosion. However, little is known about the effect of those measures on soil properties. The objective of this work was to analyse the changes of soil properties in citrus orchards subjected to different conservation measures. Experiments were conducted in four plots: control plot (SC, sloping orchard without conservation measures), sloping orchard with contour hedgerows (SCH), terraced orchard (TC) and terraced orchard with grass cover (TCG). Samples of soil surface from 0 to 15?cm were collected to analyse texture, bulk density (BD), aggregate stability, saturated hydraulic conductivity, soil organic matter (SOM) and soil nutrients. The spatial variability of those properties was also evaluated at slope and field scales. The results showed that the three conservation measures significantly increased saturated hydraulic conductivity, aggregate stability, SOM and available N, P, K, but decreased BD. The terracing with grass cover measures were the most effective in improving soil fertility among the three measures. The average SOM, available P, N, K in TCG were 0.27, 0.50, 1.74 and 1.72 and these rates are larger than for the in SC. Compared to SC, silt content was increased the SCH, while clay content was increased with TC and TCG. There was a downslope increase in clay content and total N but a decrease in gravels in the SC plot. However, that trend did not exist in the other plots. At the field scale, the soil aggregate stability and total nitrogen were significantly higher near the hedgerow under SCH, and the available N was significantly higher in the middle position under TC; the other soil properties had no significant trends based on the distance to hedgerow or stone bunds. Results of this study will contribute to a further understanding of the environmental influence of soil conservation measures. Copyright (c) 2010 John Wiley & Sons, Ltd.
机译：在中国三峡地区，山区柑桔生产系统占据了大部分易于水土流失的景观。柑橘园中广泛采用了多种土壤保护措施，例如梯田修整，以控制土壤侵蚀。但是，关于这些措施对土壤性质的影响知之甚少。这项工作的目的是分析经过不同保护措施的柑桔园土壤性质的变化。实验在四个样地中进行：对照样地（SC，没有养护措施的倾斜果园），带有等高篱笆的倾斜果园（SCH），梯田果园（TC）和带有草皮的梯田果园（TCG）。收集0至15？cm的土壤表面样品，以分析质地，堆积密度（BD），骨料稳定性，饱和导水率，土壤有机质（SOM）和土壤养分。这些属性的空间变异性也在坡度和田间尺度上进行了评估。结果表明，三种养护措施均显着提高了饱和导水率，骨料稳定性，SOM和有效氮，磷，钾，但降低了BD。在这三种措施中，用草皮措施进行梯田对提高土壤肥力最有效。 TCG中的平均SOM，有效P，N，K为0.27、0.50、1.74和1.72，这些比率大于SC中的比率。与SC相比，TC增加了淤泥含量，而TC和TCG增加了粘土含量。在SC图中，粘土含量和总氮下降坡度增加，但砾石减少。但是，其他地块中不存在这种趋势。在田间尺度下，SCH篱附近的树篱附近土壤团聚体稳定性和总氮显着较高，而在TC之下，中部有效氮显着较高。其他土壤特性基于与树篱或石堤的距离而没有显着趋势。这项研究的结果将有助于进一步了解土壤保持措施对环境的影响。版权所有（c）2010 John Wiley＆Sons，Ltd.

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