红树植物秋茄热值及其变化的研究

THE CHANGE OF CALORIC VALUES OF A MANGROVE SPECIES, KANDELIA CANDEL IN CHINA

本文分析了秋茄植物各部分的热值及其季节变化、随纬度变化的规律。结果表明:植物各部分的干重热值波动范围为17.42—20.14kJ/g;去灰分热值介于19.48—21.98kJ/g之间。其中以花、叶热值最高,根部热值最低。叶热值10月份高达19.7kJ/g;4月低至18.7kJ/g。秋茄叶热值还随纬度不同而异,春、夏、秋季热值随纬度增高而下降,冬季略有上升。这一现象反映了秋茄红树林独特的生物学特性,也反映了秋茄具有一定的抗寒性。

Kandelia candet is a mangrove species which is distributed broadly in tropical and subtropical coast areas in China.The caloric values of its various plant parts range from 17.42 to 20.14 kJ/g for gross caloric value, and 19.48 to 21.98 kJ/g for ash-free caloric value, with the highest value for flower and leaf, and the lowest for root. The caloric value of leaf varies evidently with seasons, being the highest in October (19.7kJ/g), and the lowest in April (18.7kJ/g). The caloric value also varies with latitude of the areas where the samples were collected. Genenrally, the caloric values in spring, summer and fall decrease with the latitude increase,but that in winter increase with latitude increase. The charge patterns of caloric values for leaf revealt that K. candel possessed some special biological characters and cold-resistance which make it be able to grow and to be distributed in higher latitude areas than other mangrove species.