Is chloride a conservative ion in forest ecosystems?
Is chloride a conservative ion in forest ecosystems?
复制标题
氯离子是森林生态系统中的保守离子吗？
DOI：
10.1007/s10533-010-9538-y
复制
发表时间：
2012
期刊：
影响因子：
4
通讯作者：
G. Likens
中科院分区：
文献类型：
--
作者：
T. Svensson;G. Lovett;G. Likens
氯化物 (Cl−) 通常被认为在森林生态系统中相对不活跃，并且经常用作保守示踪剂来计算水和其他离子的通量。然而，最近有几项研究详细介绍了植被和土壤中 Cl− 的循环。在这项研究中，Cl− 预算是根据 32 个流域研究编制的，以确定 Cl− 在穿过森林生态系统时得到保存的程度。这些站点的氯化物预算从净保留（输入 > 输出）到净释放（输出 > 输入）各不相同。在整个数据集中，包括那些海盐 Cl− 输入非常高的站点，输入和输出之间存在很强的对应关系。然而，Cl− 沉积量较低的地点（<6 kg ha−1 年−1）始终显示 Cl− 的净释放，表明存在内部来源或内部池下降。结果表明，在 Cl− 沉积量高的位点，Cl− 可能是保守离子，但在 Cl− 沉积量低的位点，Cl− 可能不保守。我们讨论了 Cl− 不平衡的可能原因以及 Cl− 在生态系统功能中可能不保守的原因。
Chloride (Cl−) has often been assumed to be relatively unreactive in forest ecosystems, and is frequently used as a conservative tracer to calculate fluxes of water and other ions. Recently, however, several studies have detailed cycling of Cl− in vegetation and soils. In this study Cl− budgets are compiled from 32 catchment studies to determine the extent to which Cl− is conserved in the passage through forest ecosystems. Chloride budgets from these sites vary from net retention (input > output) to net release (output > input). In the overall data set, including those sites with very high inputs of seasalt Cl−, there was a strong correspondence between inputs and outputs. However, sites with low Cl− deposition (<6 kg ha−1 year−1) consistently showed net release of Cl−, suggesting an internal source or a declining internal pool. The results indicate that Cl− may be a conservative ion in sites with high Cl− deposition, but in sites with low deposition Cl− may not be conservative. We discuss the possible causes of the Cl− imbalance and reasons why Cl− may not be conservative in ecosystem functions.