茂兰喀斯特原生乔木林凋落物对土壤养分的贡献

通过对茂兰国家级自然保护区内原生乔木林样地进行连续20个月的无凋落物输入和有凋落物输入两种对比处理,结果显示,各土层土壤C的含量在1.3-4.96%,土壤N的含量在0.12-0.52%,各土层K、Ca、Mg、Fe、Mn、Zn、Na 等元素的年均含量分别在0.32-0.43%、0.40-1.00%、0.67-0.81%、3.90-5.42%、0.16-0.29%、0.04-0.06%、0.07-0.19%,各土层元素平均含量大小为Fe﹥Mg﹥Ca﹥K﹥Mn﹥Na﹥Zn,属于Ca﹥K型。有凋落物覆盖0-10cm土层C、N、K、Ca、Mg、Zn含量均明显高于无凋落物覆盖对应土层,凋落物是土壤C、N、K、Ca、Mg、Zn的重要来源,表层土壤受凋落物层的影响较强烈。

Contribution of litter to soil nutrient of primary forest in Karst area of Maolan, Guizhou Province, China.

By comparing the primary forest sample plots in Maolan Karst Forest with and without litter input for 20 consecutive months, the results showed that the content of soil C in each soil layer was between 1.3-4.96%, and the content of soil N was between 0.12-0.52%. The average annual content of elements such as K, Ca, Mg, Fe, Mn, Zn, and Na in each soil layer was 0.32-0.43%, 0.40-1.00%, 0.67-0.81%, 3.90-5.42%, 0.16-0.29%, 0.04-0.06%, and 0.07-0.19%, respectively, The average content of elements in each soil layer is in the order of Fe>Mg>Ca>K>Mn>Na>Zn, belonging to the Ca>K type. The content of C, N, K, Ca, Mg, and Zn in the 0-10cm soil layer with litter cover is significantly higher than that in the corresponding soil layer without litter cover. Litter is an important source of soil C, N, K, Ca, Mg, and Zn, and the surface soil is strongly affected by the litter layer.