Grieve I C, Marsden R L
Department of Environmental Science, University of Stirling, UK.
Sci Total Environ. 2001 Jan 29;265(1-3):143-51. doi: 10.1016/s0048-9697(00)00655-0.
Studies at the stream catchment scale have yielded inconclusive evidence of the effects of forest land use on the concentrations of organic carbon in drainage waters. The aim of this paper is to examine the effects of forests on carbon in drainage waters at the plot scale by comparing concentrations of total organic carbon (TOC) and associated metals in soil solutions from sites under forest and moorland vegetation. At an upland site in south-west Scotland soil solution TOC, aluminium and iron concentrations varied with land cover. Mean concentrations of all three determinands were at least 1.5 times greater under forest than under moorland, despite considerable spatial and temporal (seasonal) variability. TOC in soil solutions was also found to vary significantly with both relief and altitude. The altitude effect was particularly marked, with an increase of 26 mg x l(-1) x 100 m(-1) increase in altitude found at an upland site in west-central Scotland. There were no differences in chloride, sulphate or base cation concentrations between forest and moorland sites. Differences in aluminium concentrations could not be linked to atmospheric scavenging at the forest sites, but were closely linked to differences in TOC.
针对流域尺度开展的研究，并未就林地利用对排水中有机碳浓度的影响得出确凿证据。本文旨在通过比较森林植被和荒地植被覆盖区域土壤溶液中总有机碳（TOC）及相关金属的浓度，研究林地对小尺度排水中碳的影响。在苏格兰西南部的一个高地站点，土壤溶液中的TOC、铝和铁浓度随土地覆盖情况而变化。尽管存在显著的空间和时间（季节）变异性，但所有这三种测定成分的平均浓度在林地之下至少是荒地之下的1.5倍。研究还发现，土壤溶液中的TOC随地形和海拔高度也有显著变化。海拔高度的影响尤为显著，在苏格兰中西部的一个高地站点，海拔每升高100米，TOC浓度增加26毫克/升。森林和荒地站点之间的氯化物、硫酸盐或碱性阳离子浓度没有差异。森林站点铝浓度的差异与大气清除作用无关，而是与TOC的差异密切相关。
