摘要
测定了红树植物秋茄（Ｋａｎｄｅｌｉａ ｃａｎｄｅｌ （Ｌ．） Ｄｒｕｃｅ）落叶在不同季节分解过程中碎屑的热值和富能有机化合物的变化。结果表明，季节间落叶的热值差别不大，平均为１９．６３ ｋＪ／ｇ干重或２１．５５ ｋＪ／ｇ 去灰分干重。各季节的落叶在其分解后的碎屑的热值均明显提高，且夏秋季快于冬春季，但它们与分解程度有相应的相关关系：分解初期上升，后期稍降，最大值出现在半分解期（失重５０％ ）附近。碎屑的最大热值平均比落叶的热值提高１７．６７％ （干重热值）或１４．３５％ （失灰分干重热值）。分解中总能量的耗散稍慢于干物质的损失。随分解的进行，碎屑中粗蛋白、粗脂肪、粗纤维的能量增大，而无氮浸出物的能量减少。
Changes of caloric values and energy rich organic compounds were studied in the detritus derived from mangrove Kandelia candel (L.) Druce leaf litter during the various in situ seasonal decomposition in Jiulong River Estuary, Fujian, China. The results showed that the caloric values varied little among the seasonal fallen leaves being a mean of 19 63 kJ/g dry wt or 21 55 kJ/g AF dry wt, the caloric values of detritus increased remarkably after decomposition but they more rapidly in summer and autumn than in winter and spring. The change was well in agreement with the degree of decomposition, being increased in the early decomposition period and slightly decreased in the later, with a peak at about the half time of decomposition (50% weight loss). The maximum was averagely 17 67% of dry weight and 14 35% of ash free dry weight basis over the initial values. The dissipation of total energy was somewhat slower than the loss of dry matter. As decomposition proceeds the energy of detritus was more and more contributed by raw protein, raw fat, raw fibers rather than by N free extract. Therefore it is suggested that detritus at half time of decomposition should be more important to marine detritivores from the viewpoint of energy supplement.
基金
国家自然科学基金
关键词
红树林
秋茄
落叶
分解
碎屑
能量
Mangrove
Kandelia candel
Leaf litter
Decomposition
Detritus
Energy
