RELAÇÕES HÍDRICAS DO AÇAIZEIRO EM MATA DE VÁRZEA DO ESTUÁRIO DO AMAZONAS 1
RELAÇÕES HÍDRICAS DO AÇAIZEIRO EM MATA DE VÁRZEA DO ESTUÁRIO DO AMAZONAS 1
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RELAÇÕES HÍDRICAS DO AÇAIZEIRO EM MATA DE VÁRZEA DO ESTUÁRIO DO AMAZONAS 1
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
Tatiana Deane
中科院分区：
文献类型：
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作者：
C. J. R. Carvalho;John S. Rombold;D. Nepstad;Tatiana Deane
研究了龙须草(Eurpe holacea Mart.)在亚马逊河口一个典型的潮汐淹没生态系统中生长的成熟植物上进行了评估，以评估部分或全部根系洪水以及其他环境因素在土壤-植物-大气水分转移过程中的影响。在雨季和旱季每小时测量一次气孔导度、叶片水势、相对含水率和膨压损失点的小叶相对含水率，并与大气水汽压差、太阳辐射和潮位高度相关。结果表明，与其他棕榈科树种相比，该树种的最大电导值较低(0.160 mol.m-2.s-1)。本种的气孔运动与太阳辐射的变化比与水汽压差的变化更密切地联系在一起。该物种很好地适应容易缺氧的环境，潮汐周期性的淹水不会影响根的吸水能力。此外，在旱季(低潮季节)，该物种将吸水率维持在足以满足蒸腾需求的水平。附加指标术语：油棕榈、亚马逊河口、油菜、淹水、根、气孔导度、潮汐、水分关系。
The water relations of acai palm (Euterpe oleracea Mart.) were evaluated in mature plants growing in a typical tidal flooded ecosystem of the Amazon estuary, in order to assess the effects of the partial or total root system flooding, and others environmental factors, in the soil-plant-atmosphere water transfer process. Stomatal conductance, leaf water potential, relative water content and the leaflet relative water content at the turgor loss point, were measured hourly in the rainy and dry seasons, and correlated with the vapor pressure deficit in the atmosphere, solar radiation and tide height. The results show that this species has a low maximum conductance value (0.160 mol.m -2 .s -1 ) when compared to other palm species. The stomatal movements of this species are more closely linked to variations in the solar radiation than to the vapor pressure deficits. This species is well adapted to hypoxia prone environments and periodical flooding by tides does not affect the water uptake capacity of the roots. Also in the dry season (low tides season), the species maintains water absorption at levels sufficient to supply the transpiration demand. Additional index terms: acai palm, Amazon estuary, Euterpe oleracea, flooding, roots, stomatal conductance, tide, water relations.