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A Research of Litterfall in Nanjenshan Lowland Rain Forest
|Publication Year :||1998|
The purpose of this study is to understand the pattern of litterfall along altitudinal gradient in the Nanjenshan lowland rain forest, and to compare the litterfall from 1992 to 1993 in the Lanjenshi plot. 45 traps were placed systematically along the northwestern ridge of Nanjenshan. All samples were collected monthly and separated into leaves, branches, flowers, fruits, and miscellaneous fractions.
Annual litterfall from October 1995 to September 1997 was 11.77 and 9.43 t/ha, respectively, of which 7.96 and 6.43 were leaves, 2.42 and 1.82 woody parts, 0.56 and 0.57 fruits, 0.15 and 0.13 flowers. The annual litterfall was similar with other tropical forests and higher than that of the Lanjenshi plot. The seasonal pattern of litterfall showed two pronounced peaks: during the growth season (from March to May) and the typhoon periods (from July to September). The effect of northeastern monsoon (from October to March) on litterfall was not significant.
Leaf-fall can be divided into three patterns: the growth season, the typhoon periods and the northeastern monsoon periods. Except the typhoon periods belonging to the unsteady litterfall pattern, the growth season leaf-fall was the most important pattern.
A total of 140 species, belonging to 64 families and 102 genera, were collected. Among them 88 were trees, 11 shrubs, 8 ferns and 33 lianas. The most dominant species was Ficus benjamina (7.89% of leaf litterfall), followed by Bischofia javanica (6.39%) and Cyclobalanopsis championii (4.15%). Lianas, responsible for about 17.14% of leaf litterfall, showed tropical characteristics. The dominant species of lianas were Schizostachyum diffusum (4.04% of leaf litterfall), Schizostachyum diffusum (3.71%), and Erycibe henryi (2.99%).
Result of DCA indicated that the traps on transect can be divided into three groups along the altitudinal gradient. This coincides with the three vegetation zones from crown data. The litterfall of valley zone was higher than other zones, and was dominated by Ficus benjamina, Bischofia javanica, Ilex rotunda. The slope zone was dominated by Michelia compressa, Schefflera octophylla and Syzygium euphlebium. On the ridge zone, Cyclobalanopsis championii, Syzygium kusukusense, and Cyclobalanopsis longinux were the dominant species of leaf litterfall.
|Appears in Collections:||植物科學研究所|
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