WANG Dianpei ; WANG Caiyun ; J I Shuyi ; XING Fuwu ; PENG Shaolin. Community characteristics of

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1 Vol 26 No 6 JOURNAL OF BEIJ ING FORESTRY UNIVERSITY Nov ) 2 3) 4) 1) 5) g ( ) 9 m 226 Shannon-Wiener > > 6 S WANG Dianpei ; WANG Caiyun ; J I Shuyi ; XING Fuwu ; PENG Shaolin Community characteristics of Cycas fairylakea an endemic and endangered species Journal of Beijing Forestry University (2004) 26 (6) [ Ch 26 ref ] South China Botanical Garden Chinese Academy of Sciences Guangzhou P R China http :ΠΠwww wanfangdata com cn 3 ( ) : : : ac cn : g : : : edu cn : A population of wild Cycas plants was discovered in November of 1999 in Nanshan District Shenzhen City The specimen was identified to be Cycas f airylakea D Y Wang The total number of individual C f airylakea plants was less than Thus it is an endangered species according to the new criteria of IUCN Red Categories The study of community characteristics of C f airylakea was conducted based on field data The C f airylakea community belongs to south subtropical secondary evergreen broad- leaved forest with the average height of 9 m The species diversity of the community is relatively high with the species richness of 226 in m 2 the Shannon-Wiener index of the evenness index of and the ecological dominance of The diversity pattern from maximum to minimum is shrub herb and tree layer in three layers of the community The spatial distribution pattern in mesophytic populations appears mostly clumped and that of heliophilic ones is mostly random as a result of their reproduction characteristics and the difference of micro- habits A weak inter- specific association is clarified and it shows an unsteady community structure Among six dominant populations populations of Sterculia lanceolata and Schefflera octophylla are increasing and those of Aporosa dioica Itea chinensis and Acronychia pedunculata are relatively stable whereas the population of C f airylakea is declining according to their age structures The community is still in succession process and has not reached the climax The current situation of C f airylakea community suggests that the necessary methods such as land closure for reforestation and no land reclaiming for plant fruits should be taken as soon as possible to restore the C f airylakea community and to develop progressive succession of the community Key words Cycas fairylakea endangered population community characteristic Shenzhen Tsinghua Tongfang Optical Disc Co Ltd All rights reserved

2 6 : 13 ( Cycas fairylakea) 1996 ( P E ) [6 ] ; ( S N ) [7 ] [1 ] / t [8 ] ; [ ] [10 ] [11 ] Cassie [12 ] [2 ] ; : h < 0133 m ; h 0133 m D < 215 ( cm ; 215 D 715 cm ; 715 D 2215 ( ) 1999) cm ; D 2215 cm [13 ] [14 : ] [3 ] ( I ) I = 1 N w w = i = 1 n 1 - n 2 N w n n n 2 n 2 I 1 (N E ) km mm 85 % mm ; 1 78 % 430 TABLE 1 Life form spectra of Cycas fairylakea community 1 m m [0 1 ] ; Π% % ; 1 ( 1) 10 m 10 m 47 ( Itea chinensis) ( Schefflera 2 cm octophylla) ( Aporosa dioica) ; 2 m 2 m 4 ( Ardisia quinquegona) ( Psychotria rubra) ; 212 ( Gnetum lofuense) ( Tetracera asiatica) ; Raunkiaer ( Sterculia lanceolata) [4 ] ( Archidendron clypearia) ; : ( Psychotria asiatica) ( Pothos ( S) [5 ] ; chinensis) 2 Shannon2Wiener ( S W ) [5 ] ; 9412 % Shannon2Wiener Pielous 518 % Tsinghua Tongfang Optical Disc Co Ltd All rights reserved N m 2

3 14 26 ( Adiantum flabellulatum) ( Lindsaea orbic2 ulata) ( Hypolutrum nemorum) ( Gahnia tristis) ; ; ( 2) 2 TABLE 2 Leaf characteristics of Cycas fairylakea community Π% [15 16 ] ; ( Lygodium japoni2 cum) ( Celastrus hindsii ) ( Millettia [17 ] dielsiana) 312 ; 9 m 15 ; 16 m 78 ( Acro2 nychia pedunculata) ( ) 3 ( 1) : 1 12 m ( Helicia cochinchinensis ) ( Diospyros eriantha) ( Artocarpus tonkinensis) 011 ; m ( Ficus fistulosa) ( Cleistocalyx operculatus) ( Glochidion hir2 313 sutum) 0145 ; m ( Adina pi2 [18 ] lulifera) : 22 > m 138 > 22 ( 3) ; [19 ( Ardisia crispa) ] ( Evodia lepta) ( Ardisia crenata) 3 S W P E ( Acroceras tonkinense) ( Di anella ensifolia) ( Pandanus austrosinensis) ( Scleris levis) Tsinghua Tongfang Optical Disc Co Ltd All rights reserved 1 FIGURE 1 Tree individuals at different height classes of Cycas fairylakea community [20 ]

4 6 : 15 3 ( Aquilaria sinensis) 3 ( 5) 3 TABLE 3 Diversity of family genera and species in Cycas fairylakea community S W P E S N S W P E S W P E [7 ] : 4 S S W S N ; S S W P E TABLE 4 Diversity of whole community and three layers S N > > ( 4) 314 / :15 7 ; ;8 ( Zanthoxylum avicennae) ; in Cycas fairylakea community S N S W P E S N TABLE 5 Distribution patterns of dominant populations in Cycas fairylakea community / t Cassie : 3 ( = 0 05) 3 3 ( = 0 01) 6 ( 2) 918 % ; 315 ; V ( ) [14 ] Tsinghua Tongfang Optical Disc Co Ltd All rights reserved

5 16 26 I = ( 6) 2 FIGURE 2 Age structures of six species in Cycas fairylakea community I I I 0120 ( Saurauia tristyla) [23 ] I = 0117 ; ( Euonymus chinensis) ( Si2 nosideroxylon wightianum) ( Vitex quinata) I = 0118 I = I = 0137 I = 014 I = I % [21 ] [22 ] 6 TABLE 6 The coefficient of species association of Cycas fairylakea community :1 ; 2 ; 3 ;4 ;5 ;6 ; 7 ; 8 ; 9 ; 10 ; 11 ;12 ;13 ;14 ;15 ;16 ;17 ;18 ;19 ;20 ;21 ;22 ;23 ;24 ;25 ;26 ;27 ;28 ;29 ; Tsinghua Tongfang Optical Disc Co Ltd All rights reserved

6 6 : 17 4 ; ; [24 > ] [18 ] [25 ] 1997 [7] : ; ; ; : : [16 ; ] ; ; > 1 : : (4) : : 4 - D H : Magurran A E Ecological diversity and its measurement New Jersey : Princeton University Press : : (1) : : David F N Moore P G Notes on contagious distribution in plant popu2 [26 ] lation Ann Bot : Tsinghua Tongfang Optical Disc Co Ltd All rights reserved

7 Pielou E C : jing Forestry University (5Π6) : Lloyd M Mean crowing J Anim Ecol : Yan H P Tan X Sun X Y et al Studies on species diversity of plan (5) : Proctor J Ecological studies on ( ) Environment forest structure and floristic J Ecol (2) : (2) : (5) : (1) : (2) : (3) : (2) : (2) : tation community on Beijing Xishan Journal of Beijing Forestry Univer2 sity (2) : (3) : (5) : (2) : (2) : (4) : (5Π6) : Li J W Li J Q Ren YL Taxonomic diversity of main tropical forest ecosystem nature reserves in Hainan Province China Journal of Bei2 ( ) 22 ( ) Chinese Forestry Selected Abstracts 3 6 ( ) : : : com Tsinghua Tongfang Optical Disc Co Ltd All rights reserved