A preliminary estimate of organic carbon transport by the Ayeyarwady (Irrawaddy) and Thanlwin (Salween) Rivers of Myanmar
A preliminary estimate of organic carbon transport by the Ayeyarwady (Irrawaddy) and Thanlwin (Salween) Rivers of Myanmar
复制标题
DOI：
10.1016/j.quaint.2007.08.003
复制
发表时间：
2008-08
影响因子：
2.2
通讯作者：
M. Bird;R. Robinson;N. Oo;M. Aye;Xixi Lu;D. Higgitt;Aung Swe;Tint Tun;S. Win;K. S. Aye;K. Win;T. Hoey
中科院分区：
文献类型：
--
作者：
M. Bird;R. Robinson;N. Oo;M. Aye;Xixi Lu;D. Higgitt;Aung Swe;Tint Tun;S. Win;K. S. Aye;K. Win;T. Hoey
我们报告的初步研究结果的颗粒和溶解的有机碳运输在缅甸的伊洛瓦迪和Thanlwin河，根据52悬浮沉积物样品和9个水样收集在2005年和2006年的低流量和高流量的条件。伊洛瓦迪河以POC的形式输送2.2-4.3MtC/yr，加权平均δ 13 C值为-24.8‰，而Thanlwin河以POC的形式输送2.4-3.4MtC/yr，加权平均δ 13 C值为-25.3‰。此外，伊洛瓦迪和丹温河的δ 13 C值分别为-26.2‰和-27.1‰，分别为0.9Mt/a和0.23Mt/a。伊洛瓦迪流域和坦温流域相互毗邻，在长度尺度上与恒河-雅鲁藏布江或亚马逊河三角洲相似，流入印度洋。因此，伊洛瓦迪河和Thanlwin河应被视为对全球海洋有贡献的单一点源。这一河流系统每年输送5.7-8.8MtC的有机碳，这表明它可能是全球海洋中仅次于亚马逊的第二大有机碳点源。该流域的隐含有机碳产量为8.4- 12.9吨/平方公里/年，这显然是世界上类似规模的河流中最高的。高有机碳产量很可能是由于（一）强烈的季风气候，（二）大面积的高产森林目前在陡峭的山坡上的一个地区的活动构造，和（三）相对较小的面积在集水区的洪泛平原。
We report results of a preliminary study of particulate and dissolved organic carbon transport in the Ayeyarwady and Thanlwin Rivers of Myanmar, based on 52 suspended sediment samples and 9 water samples collected during conditions of low and high flow in 2005 and 2006. The Ayeyarwady transports 2.2–4.3MtC/yr as POC with a weighted average δ13C value of -24.8‰, while the Thanlwin transports an additional 2.4–3.4MtC/yr with a δ13C value of -25.3‰. In addition, the Ayeyarwady transports ∼0.9Mt/yr, and the Thanlwin ∼0.23Mt/yr, of DOC with a δ13C value of -26.2‰ and -27.1‰, respectively. The Ayeyarwady and Thanlwin catchments adjoin each other, debouching into the Indian Ocean over a length scale similar to the deltas of the Ganges–Brahmaputra or the Amazon. Therefore, the Ayeyarwady and Thanlwin rivers should be considered a single point source contributing to the global ocean. This combined river system transports 5.7–8.8MtC/yr of organic carbon, suggesting that it may be the second largest point source of organic carbon to the global ocean after the Amazon. The implied organic carbon yield from the catchments is 8.4–12.9t/km2/yr, which is clearly amongst the highest in the world among rivers of similarly large size. The high organic carbon yields are likely to be the result of (i) a strongly monsoonal climate, (ii) the large area of highly productive forest present on steep slopes in a region of active tectonism, and (iii) the comparatively small area of floodplain in the catchments.