模拟石灰添加对雷竹林土壤氮矿化的影响
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中国科学院战略先导科技专项(XDA05070303)资助


Effect of Liming on Soil Nitrogen Mineralization of Phyllostachys praecox Using Lab Incubation Experiment
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    摘要:

    土壤酸化是临安雷竹林竹笋生产的主要障碍因子之一。为了提高雷竹笋的产量,改良酸性土壤,提高土壤供氮能力极为重要。本研究以不同种植年限的雷竹林土壤为研究对象,通过模拟试验分析了石灰添加对土壤供氮能力的影响。试验采用Stanford间歇淋洗好气培养法,研究不同石灰添加量处理的土壤氮矿化动力学特征。结果表明,雷竹林土壤随着种植年限增加,pH显著降低,表层有机质和氮素显著积累。不同石灰添加量处理的雷竹林土壤119 天氮矿化过程符合一级反应动力学方程。与对照相比,施用石灰后,土壤氮供应综合指数均有不同程度的提高,说明添加石灰可显著提高土壤氮的有效性。经估算,当前雷竹林每千克土壤施用石灰4 ~ 8 g较适宜,石灰施用过多,会导致土壤矿质氮的过量积累,进而增加氮素损失。因此,通过合理施用石灰,可以缓解雷竹林土壤酸化和提高土壤供氮潜力,增强雷竹的可持续经营。

    Abstract:

    Severe soil acidification is a major constraint to Phyllostachys praecox production of Lin’an City, Zhejiang Province. In order to improve bamboo shoots production, it is important to meliorate soil acidity and enhance the availability of soil nitrogen. Soil samples from Phyllostachys praecox under various planting years were selected to simulate and analyze the effect of liming on soil nitrogen availability. An intermittent leaching method was adopted to investigate nitrogen mineralization rates and potentials in bamboo soils under various lime application rates. The results showed that soil pH decreased greatly, soil organic matter and nitrogen content in the surface soil increased obviously with the increase of bamboo planting time. A first-order kinetic model could be used well to predict N mineralization as a function of time. The N0×k value of nitrogen mineralization with liming was significantly higher than that without liming, which suggested that liming measure could increase soil nitrogen availability greatly. According to estimation, the suitable amount of lime on bamboo soil was 4-8 g/kg; excessive lime could cause soil mineral nitrogen accumulated excessively, and then increase soil nitrogen loss. Overall, a rational application of lime in acid soil can increase soil pH value and improve soil available N pool and N mineralization rate to enhance the productivity of acidic soils.

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程 琳,孙 晓,庄舜尧,杨 浩.模拟石灰添加对雷竹林土壤氮矿化的影响[J].土壤,2013,45(6):992-998. CHENG Lin, SUN Xiao, ZHUANG Shun-yao, YANG Hao. Effect of Liming on Soil Nitrogen Mineralization of Phyllostachys praecox Using Lab Incubation Experiment[J]. Soils,2013,45(6):992-998

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  • 在线发布日期: 2014-01-17
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