Global abundance and size distribution of streams and rivers
Global abundance and size distribution of streams and rivers
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DOI：
10.5268/iw-2.4.502
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发表时间：
2012-01-01
期刊：
影响因子：
3.1
通讯作者：
Tranvik, L. J.
中科院分区：
文献类型：
--
作者：
Downing, J. A.;Cole, J. J.;Tranvik, L. J.
为了更好地将热带生态系统纳入全球循环和预算，我们提供了溪流和河流的大小分布和面积范围的近似值。我们使用的一种方法是将河流网络理论与河流宽度数据相结合。我们还使用了两大洲的详细河流网络来估计全球河流在大陆面积中所占的比例，并修正了未解决的小河流的遥感河流清单。我们对全球河流面积的估计为48.5万至66.2万千米(2)，是已发表评估的+30-300%。中等大小的河流(5-9级)似乎构成了最大的全球面积，低级和高级别河流覆盖的面积较小，而全球河流长度，因此河岸界面，由一级河流主导。河流和溪流可能覆盖0.30-0.56%的陆地表面，对全球进程和温室气体排放的贡献可能比之前估计的高出+20%-200%。
To better integrate lotic ecosystems into global cycles and budgets, we provide approximations of the size-distribution and areal extent of streams and rivers. One approach we used was to employ stream network theory combined with data on stream width. We also used detailed stream networks on 2 continents to estimate the fraction of continental area occupied by streams worldwide and corrected remote sensing stream inventories for unresolved small streams. Our estimates of global fluvial area are 485 000 to 662 000 km(2) and are +30-300% of published appraisals. Moderately sized rivers (orders 5-9) seem to comprise the greatest global area, with less area covered by low and high order streams, while global stream length, and therefore the riparian interface, is dominated by 1st order streams. Rivers and streams are likely to cover 0.30-0.56% of the land surface and make contributions to global processes and greenhouse gas emissions that may be +20-200% greater than those implied by previous estimates.