Mid-Holocene mangrove succession and its response to sea-level change in the upper Mekong River delta, Cambodia
Mid-Holocene mangrove succession and its response to sea-level change in the upper Mekong River delta, Cambodia
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DOI：
10.1016/j.yqres.2012.07.001
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发表时间：
2012-07
影响因子：
2.3
通讯作者：
Zhen Li;Y. Saito;Limi Mao;T. Tamura;Zhen Li;B. Song;Yulan Zhang;Anqing Lu;Sotham Sieng;Jie Li
中科院分区：
文献类型：
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作者：
Zhen Li;Y. Saito;Limi Mao;T. Tamura;Zhen Li;B. Song;Yulan Zhang;Anqing Lu;Sotham Sieng;Jie Li
中全新世植被和红树林的演替在柬埔寨湄公河三角洲上游的两个岩芯的孢粉学记录中是明显的。在9.4 ~ 6.3 cal ka BP的时间段内，主要记录了一个由河漫滩淡水沼泽到潮坪的海侵序列，其上覆有红树林。与8.3 cal ka BP时海平面上升速度减缓相对应的是，在沉积物中出现了先锋红树林种Sonneratia alba和Sonneratia caseolaris，然后被后退的红树林演替所取代，其中Rhizophora apiculata和Bruguiera spp的丰度向上增加。耐高盐、耐高盐群落S。alba在PSG岩芯西部约8.2 cal ka BP，PK岩芯东部约7.5 cal ka BP。S.两个地点之间的alba出现可能是由于沉积环境的复杂性，其中西部河漫滩比东部河漫滩提供了更多的沉积物供应。7.5-7.0 cal ka BP期间海平面持续上升，可能是7.5-7.0 cal ka BP之后，厚度大于现今最大潮差的潮间带沉积物加积堆积的结果。
Middle Holocene vegetation and mangrove successions are clearly evident in the palynological records of two cores from the upper Mekong River delta in Cambodia. Spanning from ~ 9.4 to 6.3 cal ka BP, the cores mainly record a transgressive sequence from floodplain freshwater marsh to tidal flat, which was overlain by mangrove. Corresponding to the decelerated sea-level rise at ~ 8.3 cal ka BP, pioneer mangrove species Sonneratia alba and Sonneratia caseolaris appeared in the sediments, and then was replaced by regressive mangrove succession containing upward-increasing abundances of Rhizophora apiculata and Bruguiera spp. High salinity- and flooding-tolerant community S. alba was developed at the western core site PSG at ~ 8.2 cal ka BP, and the eastern core site PK at ~ 7.5 cal ka BP. The time difference of S. alba appearance between the two sites might be resulted from the complexity of sedimentary environment, where a higher sediment supply was provided to the western floodplain than to the eastern floodplain. After 7.5 cal ka BP, aggradational stacking of intertidal sediments, of which the thickness is larger than the present maximum tidal range, may have resulted from continuous sea-level rise during 7.5–7.0 cal ka BP.