淋溶过程对亚高山针叶林土壤碳、氮海拔分布特征的影响
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国家自然科学基金项目(41630751; 41877011); 湖北省高等学校优秀中青年科技创新团队计划项目(T2020016); 湖北文理学院学科开放基金项目(XK2020063)


Effects of leaching process on characteristics of altitudinal distribution of soil carbon and nitrogen in subalpine coniferous forest
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    摘要:

    为揭示淋溶过程在山地养分循环中的重要作用,研究了贡嘎山东坡海拔2 600~3 200 m针叶林土壤碳(C)、氮(N)的海拔分布特征,分析了不同海拔4个样点的针叶林土壤C、N含量及碳氮比(C/N),并结合其他土壤物理、化学和生物指标探讨了淋溶过程对土壤C、N海拔分布特征的影响。结果显示:分解强烈的凋落物层(OH层)的C、N含量和碳氮比(C/N)随海拔升高有降低趋势。由于凋落物碳(Clit)含量分别与OH层C、N含量显著正相关(P<0.05),因此,OH层C、N海拔分布特征主要由Clit输入量控制。与OH层相比,矿质土层(A、B和C层)中C、N含量及C/N并未发现明显的梯度变化趋势。A层C、N含量在2 781 m样点较低,而B和C层C、N含量均在2 781 m样点最高。天然降雨中C、N含量明显低于壤中流中C、N含量,展现了淋溶作用对C、N空间分布的影响。上述结果表明,淋溶过程对西南亚高山针叶林土壤C、N空间分布格局具有不可忽略的影响。

    Abstract:

    In order to reveal the importance of leaching on mountainous nutrients cycling,the characteristics of altitude distribution of soil C and N in the coniferous forest at an altitude of 2 600-3 200 m on the eastern slope of the Gongga mountain were studied. The soil C,N content and C/N of the conifers at 4 sampling points at different altitudes were analyzed. Combined with other soil physical,chemical and biological indicators,the effects of the leaching process on the characteristics of altitudinal distribution of soil C and N were explored. The results showed that the spatial distributions of C,N contents and C/N in the humified litter horizon (OH horizon) exhibited a similar decreasing trend with the increase of altitude. Since the content of C in litters (Clit) was positively correlated with soil C and N in the OH horizon(P<0.05),the production of Clit was the main factor affecting the altitudinal distributions of soil C and N in the OH horizon. The obvious altitudinal trend was not observed for soil C,N contents and C/N in the mineral horizons (A,B and C horizon). The contents of soil C and N in the A horizon were lower than those in the 2 781 m site,while the maximums were for the B and C horizon in this site. The contents of soil C and N in the rainfall were significantly lower than those in the interflow,which showed the effects of leaching on the spatial distributions of soil C and N. It is indicated that the effects of leaching process on the spatial distributions of soil C and N in subalpine coniferous forest in Southwest Asia can not be ignored.

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何晓丽,吴艳宏,周俊,马婷婷.淋溶过程对亚高山针叶林土壤碳、氮海拔分布特征的影响[J].华中农业大学学报,2021,(1):187-194

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  • 收稿日期:2020-07-23
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  • 在线发布日期: 2021-02-10
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