Predicting export of dissolved organic carbon from forested catchments in glaciated landscapes with shallow soils
Predicting export of dissolved organic carbon from forested catchments in glaciated landscapes with shallow soils
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DOI：
10.1029/2008gb003294
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发表时间：
2008-12
影响因子：
5.2
通讯作者：
Irena F. Creed;F. Beall;T. Clair;P. J. Dillon;R. Hesslein
中科院分区：
文献类型：
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作者：
Irena F. Creed;F. Beall;T. Clair;P. J. Dillon;R. Hesslein
本研究提出了一个简单的模型，溶解有机碳（DOC）负荷的表面沃茨，适用于在冰川景观森林地区的水源集水区。沿沿着东西向样带的33个试验集水区的DOC年平均输出量变化很大，范围为0.90 - 13.74 g C/m2/a。据推测，集水区内的湿地的比例将解释大多数的变化，平均每年DOC的出口。为了验证这一假设，数字地形分析被用来自动获得湿地下的开放和封闭的森林冠层，通过确定一个网格单元是一个抑郁症和/或平坦的概率。使用一个10米的数字高程模型（DEM）来自现成的来源，湿地的比例解释了63%的变异，平均每年DOC出口之间的33个实验集水区。纳入区域气候指标，包括生长度日数（以10°C为基数）和径流系数，增加了方差的解释从63%到89%，一旦与湖泊（>5%的集水面积）毗邻集水出口的集水被删除。这项研究表明，DOC出口可以准确地预测从河源流域的森林地区冰川景观使用一个简单的模型，湿地的比例和容易计算的气候变量的基础上。
This study presents a simple model of dissolved organic carbon (DOC) loading to surface waters that is applicable to headwater catchments in forested regions on glaciated landscapes. Average annual DOC export was highly variable among the 33 experimental catchments along an east‐west transect, ranging from 0.90 to 13.74 g C/m2/a. It was hypothesized that the proportion of wetlands within the catchments would explain the majority of variation in average annual DOC export. To test this hypothesis, digital terrain analysis was used to derive wetlands automatically under both open and closed forest canopies by identifying the probability of a grid cell being a depression and/or flat. Using a 10 m digital elevation model (DEM) derived from readily available sources, the proportion of wetlands explained 63% of the variance in average annual DOC export among the 33 experimental catchments. Inclusion of regional climatic indicators, including the number of growing degree days (with a base of 10°C) and the runoff coefficient, increased explanation of variance from 63% to 89%, once catchments with lakes (>5% of catchment area) adjacent to the catchment outlets were removed. This study shows that DOC export can be predicted accurately from headwater catchments in forested regions on glaciated landscapes using a simple model based on the proportion of wetlands and easily calculated climatic variables.