417 hm 2, ( Bambusa lapidea), 3 20 m 20 m China Academic Journal Electronic Publishing House. All rights reserved.

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1 , No14 Vol119 TROPICAL GEOGRAPHY Dec., 1999,,, ( ) :,, 1200 m 2, 62, 32 54,, 32, - 21, 7, 2,, 115m ,, 100 m 2 185,,, 4, , ,,, : ; ; : Q94813/ 15 : A : (1999) ,,,, 1, 22 45, , 2116,, mm,,, 4 9, 80 %,,,, 3113 %,, ph ,, hm 2, ( Bambusa lapidea), 3 20 m 20 m [1], 4 10 m 10 m, 115m,, 12 5 m 5 m 1 m 1 m, ( m) ( 015 m) ( : ; : : ( ),,,, 3,,,,.,.

2 4 : 313, ) ,, m 2, 62, 54 32, , 1 ( 1) m 2 Aspidiaceae 1 1 Gnetaceae 1 1 Annonaceae 3 3 Lauraceae 3 5 Thymelaeaceae 1 1 Proteaceae 1 1 Theaceae 1 1 Myrtaceae 1 2 Melastomaceae 1 2 Elaeocarpaceae 1 1 Sterculiaceae 1 1 Euphorbiaceae 4 4 Rosaceae 2 2 Mimosaceae 1 1 Papilionaceae 2 2 Ulmaceae 1 1 Moraceae 2 2 Aquifoliaceae 1 1 Celastraceae 1 1 Santalaceae 1 1 Rutalaceae 2 3 Burseracae 1 1 Meliaceae 1 1 Alangiaceae 1 1 Araliaceae 1 1 Sapotaceae 1 1 Myrsinaceae 3 4 Symplocaceae 1 2 Oleaceae 1 1 Apocynaceae 1 1 Rubiaceae Verbenaceae ,, 20, 6215 %; 45, 8313 % [2] (gengeric coefficient, ) 8313 %, ( 212 %, 211 %, 211 %) [3] [4], 53 [5], ( 2), 3410 % 2614 % 1818 %, 2 62, 32, 5116 %, 21, 3319 %, 7, 1113 %, 2, 312 %, (Endospermum) (Microdesmis) (Aporosa), (Machilus) (Cryptocarya), (Ca2 narium), (Abarema), (Artocarpus) (Ficus), ( Sterculia ), (Dysoxylum), (Canthium) ( Ixora) (Mussaenda) (Pavetta) (Randia) (Tricalysia), ( Kop2 sia), (Maesa), (Uvaria) (Desmos) ( Fissistigma), (Aquilaria), (Memecylon), (Chrysophyllum), (Dendrotrophe), (Abrus) (Dalbergia)

3 / % ( Mussaenda pubescens ) ( Gmetum 312 montanum) ( Dalbergia hancei), 31211,, ( Endospermum chi2, ( Psychotria serpens) (Lemmaphyllum microphyllum), nense),,, ( Helicia cochinchinensis) (Canarium album), ( Artocarpus styraci2 folius ) 31212,,,, 3 4 m,, m, 26 ( Ficus variegata var. chlorocarpa m, F. fistulosa ) Raunkiaer [5], ( 3),,, 29, 016 ; 9 18 m, m, 6415 %,, 67,, 015 ; Ranukiaer [5], ( 4), 31, 50 %,, 14, 2216 % 3 (1200 m 2 ) % (1200 m 2 ) % ,,,,, ( Dendrotrophe frutescens) 9 m,,

4 4 : 315, 95 % 115m,,, 100 m 2 185, 70 %, ,,, ( h, 30 % 33cm; h > 33cm, dbh 215cm; cm < dbh 715cm; 715cm, < dbh 2215cm; dbh > 2215cm, h, Shannon - Wiener, Simposn SW Pielou [6,7] ( 5),,,, [7],, (Source),, dbh ),, [8] 1, 0,,,,,,,, / 1

5 : 2/ ( N - 1) T, T = [ ( / n) - 1 ] / 2/ ( N - 1), X 2 = ( / n) ( N - 1), N %, = 6 N ( n i - n) 2 / ( N - 1), n = 6 N m 10 m n i / N i =1 i =1 10 / m 2 24 ( i = 1,2,, N) 1 ( 6), N, n i, t - X 2 -, 6 3 [10],, (n 10/ 1200 m 2 ) / n T T X 2 X 2 Helicia cochinchinensis p c Endospermum chinense p p Elaeocarpus sylvestris p p Machilus chinensis c c Litsea elongata c c Artocarpus styracifolius c c Sterculia lanceolata c c Symplocos dolichotricha c c Gironniera subaequalis c c Kopsia lancibracteolata c c Psychotria rubra c c Microdesmis caseariaefolia c c Ardisia quinquegona c c Fissistigma glaucescens c c Randia acuminatissima c c Uvaria microcarpa c c Desmos chinensis c c Tricalysia dubia c c Aporosa chinensis c c Ficus hirta p p Acronychia pedunculata c c Schefflera octophylla c c Aquilaria sinensis c c Ilex asprella p p 3 P - (Poission) ; C - (Clump) ; : t 0195,11 = 21201; X ,11 = ,, 50,,

6 4 : ,, -,,,,,, : [1],,. [J ]., 1982, 6 (1) : [2]. [J ]., 1979, 34 (3) : [3]. [A].. [ C]. :, [4]. [J ]., 1979, 1 (1) : [5] D Mueller - Dombois, H Ellenberg,. [M]. :, [6]. [A].,. [ C]. :, [7]. [M]. :, [8],,. [M]. :, [9]. [J ]., 1988, (1) : [10],. [A].. [ C]. :, AN ANALYSIS OF THE COMMUNITY OF SECONDARY EVERGREEN BROAD - LEAF FOREST IN LONGKOU, HESHAN CAO Hong2lin, CAI Xi2an, PENG Shao2lin, Yu Zuo2yue ( South China Institute of Botany, Academia Sinica, Guangzhou , China) Abstract : The secondary monsoon evergreen broad - leaf forest at a village of Longkou Town, Heshan City, Guangdong, located at the south edge of sub - tropical zone, is a community of Helicia cochinchinensis, En2 dospermum chinense, Machilus chinensis and Gironniera subaequalis. A m 2 plot of the community con2 sists of 32 families, 54 genera and 62 species, of which 32 species are tropical elements, 21 pan - tropical and 7 sub - tropical, and the others are extensive species. An evergreen appearance and complicated vertical structure are found in the community. There are tree individuals which are over 115 m in height in the plot, and 185 shrub individuals in the 100 m 2 plot. Most herb species are offspring of trees and shrubs, the true grasses are few. The organization structure of the community is similar to that of the zonal vegetation. The Shannon - Winner index is about 4, the community evenniss and Simpson ecological dominance Most of the dominant population of the community are of clump distribution. The community would evolve toward the climax vegetation with human disturbance reducing. Key words : Evergreen broad - leaf forest ; Secondary forest ; Community analysis