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首页> 外文期刊>Scandinavian Journal of Forest Research >Dynamics of soil C, N and Ca in four Swedish forests after removal of tops, branches and stumps as predicted by the Q model.
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Dynamics of soil C, N and Ca in four Swedish forests after removal of tops, branches and stumps as predicted by the Q model.

机译：Q模型所预测的去除顶部，分支和树桩后瑞典四个森林中土壤C，N和Ca的动态。

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摘要

We used the Q model to examine the dynamics of carbon (C), nitrogen (N) and calcium (Ca) in the litter/soil system in different scenarios of harvesting intensities, S (stems only), SSl (stems and slash, i.e. tops, and branches including needles) and SSlSt (stems, slash and stumps including coarse roots). Empirical data from long-term field experiments in Sweden, two sites with Norway spruce and two with Scots pine with different levels of productivity, were used to calibrate the model against the stem-only treatment. The highest initial reduction in soil C, N and Ca stores was predicted for SSlSt, and the reduction was more pronounced at low productive sites than at the high productive ones. Most of the decline in soil C and Ca stocks was offset by the litter production in the following forest stand. N showed an initial phase of immobilisation in stumps and coarse roots, while N was immediately released from tops and branches, which contained N-rich needles. Removal of stumps and coarse roots in combination with slash resulted in a similar load of inorganic soil N as for the S treatment, whereas the SSl treatment with stumps left in the soil initially reduced the inorganic soil N pool.
机译：我们使用Q模型检查了在不同采伐强度，S（仅茎），SSl（茎和斜线）的情况下，枯枝落叶/土壤系统中碳（C），氮（N）和钙（Ca）的动态。顶部和分支，包括针叶）和SSlSt（茎，斜线和树桩，包括粗根）。来自瑞典的长期野外实验的经验数据，分别是挪威云杉的两个地点和生产力水平不同的两个苏格兰松树的地点，用于针对仅茎处理的模型进行了校准。预测SSlSt的土壤C，N和Ca储量最高初始减少量，并且在低产地比高产地减少更为明显。在以下林分中，凋落物的产生可以抵消大部分土壤碳和钙储量的下降。氮显示出固定在树桩和粗根中的初始阶段，而氮则立即从含有富氮针的顶部和分支中释放出来。去除树桩和粗大的根部并结合砍伐产生的无机土壤氮负荷与S处理相似，而对土壤中残留的树桩进行的SS1处理最初减少了无机土壤氮库。

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