Aström Mats, Aaltonen Eeva-Kaarina, Koivusaari Juhani
Department of Geology and Mineralogy, Abo Akademi University, Finland.
Sci Total Environ. 2002 Oct 7;297(1-3):127-40. doi: 10.1016/s0048-9697(02)00129-8.
The effect of ditching of boreal forest land (W. Finland) on P and N dynamics and export was assessed using a paired catchment approach (response stream + control stream) for a 4-year study period. After the ditching operations, there was a small but significant increase in the NH4+ export, but no significant changes in the concentrations and loads of total reactive P, total non-reactive P, total organic N and NO3-. In both streams, the reactive P fraction largely followed the Fe concentrations. High input to output ratios, and thus, high retention was a typical feature of the inorganic N compounds. Total organic N and the TOC/TON ratio were positively correlated with the total organic carbon.
采用配对集水区方法（响应溪流+对照溪流），对芬兰西部北方针叶林土地开垦4年期间对磷和氮动态及输出的影响进行了评估。开垦作业后，铵根离子输出略有但显著增加，而总活性磷、总非活性磷、总有机氮和硝酸根离子的浓度及负荷均无显著变化。在两条溪流中，活性磷部分在很大程度上随铁浓度变化。无机氮化合物的典型特征是输入输出比高，因此保留率也高。总有机氮和总有机碳/总有机氮比值与总有机碳呈正相关。
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