广西英罗湾红海榄群落凋落物研究

本文主要研究广西合浦山口英罗湾红树林保护区红海榄群落的凋落物,结果表明:(1)红海榄群落1989年凋落物量为631.26 g/m~2,其中落叶561.50 g/m~2,说明落叶在红海榄群落物质归还中起着关键性作用。(2)年凋落物中各组分占总量的比例分别为叶88.95％、花3.68％、果(含胚轴)3.0％和枝4.26％。(3)月凋落物量(Y_1,g/m~2)与月平均气温(X_1,℃)呈线性正相关,其回归公式为Y_1=3.071 x_1-16.804(r=0.77,df=14),相关极显著;月凋落物量(Y_1)与月降水量(X_2,mm)的回归公式为Y_1=0.116 x_2+34.381(r=0.62,df=14),相关极显著。高温高湿季节的凋落物量明显高于低温干燥季节的凋落物量。

STUDY ON THE LITTER FALL OF RHIZOPHORA STYLOSA COMMUNITY IN YINLUO BAY, GUANGXI

In this paper the litter production of Rhizophora stylosa commanity in Yinluo Bay of Guangxi have been studied for a period of 16 months. Litter fall was collected throughout the year by 15 traps each 1 m2. The results showed that: (1) The total litter production was 631.26 g/m2. yr, in which leaf litter was 516.50 g/m2. yr. (2) The leaf, flower, fruit and branch litter fall productions to the total litter fall production were 88.95%, 3.68% 3.08% and 4.29% respectively. (3) Monthly litter fall (Y1, g/m2) was positively correlated with monthly mean air temperature (Y1, ℃) and the regression equation was Y1=3.071 x1-16.804 (r=0.77, df=14), . showing a greatly significant relation. The regression equation of monthly litter fall (Y1) and monthly precipitation (X2, mm) was Y1=0.116 x2 + 34.381 (r=0.62 , df=14),also showing a greatly significant relation. The heaviest falls occurred in the hot and humid seasons.