Variations in water use by a mature mangrove of Avicennia germinans, French Guiana
Variations in water use by a mature mangrove of Avicennia germinans, French Guiana
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DOI：
10.1051/forest/2009079
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发表时间：
2009-12-01
影响因子：
3
通讯作者：
Fromard, Francois
中科院分区：
文献类型：
--
作者：
Muller, Etienne;Lambs, Luc;Fromard, Francois
在热带潮间带，人们对红树林的吸水情况知之甚少。蒸腾速率通常在叶片水平上测量，本研究的目的是测定不同大小树木的液流，以了解在80%占主导地位的立地条件下，水分利用的变化范围。结果表明，从旱季到雨季，幼树的平均耗水量从3.2增加到5.3 dm（3）d（-1）（胸径13 cm左右），中径（24 cm左右）为11.5 ~ 30.8 dm（3）d（-1），大径（45 cm左右）为40.8 ~ 64.1 dm（3）d（-1）。VPD与净辐射的相关性较弱，说明低盐度下蒸腾作用较大。林分水平的用水量（类似于1900个活茎公顷（-1））估计在5.8至11.8 m（3）ha（-1）d（-1）的范围内，根据季节而定。
In the tropical intertidal zones, little is known on water uptake by mangroves. Transpiration rates are generally measured at leaf level, but few studies exist on water use at tree or stand levels.The objective of this study was to measure sap flow in trees of different sizes to appreciate the range of variation in water use that may exist in a site dominated by 80% mature Avicennia germinans.The results showed that from the dry to the wet season the mean water use increased from 3.2 to 5.3 dm(3) d(-1) in small trees (DBH similar to 13 cm), from 11.5 to 30.8 dm(3) d(-1) in medium trees (similar to 24 cm) and from 40.8 to 64.1 dm(3) d(-1) in large ones (similar to 45 cm).Sapwood remained active up to a depth of 8 cm with radial variations within the stem. Weak correlations were obtained with VPD and net radiation.This study confirmed that transpiration was larger under low levels of salinity. Water use at stand level (similar to 1900 living stems ha(-1)) was estimated to be in the range of 5.8 to 11.8 m(3) ha(-1) d(-1) according to the season.