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模拟外源性氮磷对马占相思凋落叶分解及土壤生化特性的影响

Effects of Nitrogen and Phosphorus Additions on Leaf Litter Decomposition and Soil Biochemical Characteristics in an Acacia mangium Plantation

  • 摘要:
    目的 研究外源性氮和磷对马占相思凋落叶的分解速率、分解过程中N、P、K含量和土壤生化特性的影响, 以便为森林土壤养分管理提供参考。
    方法 以广东省云勇林场马占相思林下凋落叶为试验材料, 采用尼龙网袋分解法, 设置对照(CK)、施N(10 g·m-2)、施P(5 g·m-2)、施N+P(N 10 g·m-2+P 5 g·m-2)4种处理, 每隔3个月取样1次, 并测定凋落叶残留量和N、P、K含量。
    结果 表明:施N、P和N+P处理对马占相思凋落叶的分解均为促进作用。各处理马占相思凋落叶的N含量在分解过程中大致保持稳定, 施P和N+P处理的凋落叶P含量在分解过程中总体呈波动性上升, 而各处理的凋落叶K含量变化规律不明显。施N、P和N+P处理提高了马占相思林土壤的有机质和全N含量, 促进脲酶、磷酸酶及过氧化氢酶的活性。
    结论 施N、P和N+P处理促进了马占相思凋落叶的分解, 有利于马占相思林的养分循环。

     

    Abstract:
    Objective To study the effects of nitrogen and phosphorus additions on leaf litter decomposition, nutrient dynamics and soil biochemical characteristics during the decomposition process in a Acacia mangium plantation in order to understand the mechanism of influence of nitrogen and phosphorus on leaf litter decomposition of A. mangium and forest soil nutrient management.
    Method Leaf litter decomposition of the A. mangium plantation in Yunyong Forest Farm was investigated using litter bag method. N and P additions were designed in four treatments:the control, N addition (N 10 g·m-2), P addition (P 5g·m-2), and N+P addition (N 10g·m-2+P 5g·m-2). It was sampled in a three-month interval and then the remaining leaf litter and N, P, K contents were analyzed.
    Result The N, P and N+P additions improved leaf litter decomposition. The N content of leaf litter with the four treatments remained stable. The P content of leaf litter with P and N+P additions tended to increase and were greater than their initial value during litter decomposition process. The K content of leaf litter with the four treatments changed irregularly. The N, P and N+P additions significantly increased soil organic matter and total N contents and improved activities of soil urease, acid phosphatase and catalase.
    Conclusion N, P and N+P additions accelerated leaf litter decomposition of the A. mangium, which improved the nutrient cycling of A. mangium plantation.

     

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