红海榄红树林的蒸腾作用与生态因子的关系

RELATIONSHIP BETWEEN TRANSPIRATION OF RHIZOPHORA STYLOSA MANGROVE FOREST AND ECOLOGICAL FACTORS

摘要:

在海南东寨港应用气孔计对红海榄红树群落的蒸腾速率、气孔导度和几个生态因子日变化同步进行测定。在12月19日晴天条件下,冠层叶的蒸腾作用上午10—11时达到最高值4.27—4.34μg·cm~(-2)s(-1),午间蒸腾速率下降。群落总蒸腾速率与光合有效辐射、叶内外水汽压差、气温、相对湿度、叶温和风速等因子的复相关达到极显著;对蒸腾速率影响显著的生态因子是光合有效辐射,相对湿度和叶内外水汽压差。红海榄群落日平均蒸腾速率为2502gH_2O·m~(-2)d~(-1),其中冠层叶的蒸腾占总量的63％。

Abstract:

Diurnal changes of transpiration rate and stomatal conductance in Rhizophora stylusa Griff. mangrove forest and some ecological factors were determined by porometer in Hainan. In the sunny day in December, transpiration rate of the forest canopy reached its peak between 10 to 11 o'clock at 4. 27 - 4. 34μg · cm-2s-1, and decreased at noon. It was shown that the complex correlation between transpiration rate of community and ecological factors, i. e. , photosynthetic active radiation (PAR), leaf-air vapour pressure difference, air temperature, relative humidity and leaf temperature, was very significant. The critical factors affecting transpiration rate of the community were PAR, relative humidity and leaf-air vapour pressure difference. The everage of total transpiration rate of R. stylosa forest was 2502 g H2O · m-2d-1, of which the transpiration rate of the canopy accounted for 63%.