D ynam ics of Erythrophleum Fordii Community and Conservation Strategies

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1 2005, 20 (3) : Journal of Northwest Forestry University 3 1, 2, 1 33, 1, 1, 2, 1, 2 (1., ; 2., ) : ( E rythroph leum fordii), : ( 1), ( C ryptocarya concinna ) ( C. ch inensis) ; (2),, ; (3),,,, : ; ; ; ; : S : A : (2005) D ynam ics of Erythrophleum Fordii Community and Conservation Strategies SH I Jun2hu i 1, 2, HUANG Zhong2liang 13, Y IW e i2m in 1, O UYANG Xue2jun 1, 2, ZHO U X iao2yong 1, 2 ( 1. D inghushan N ature Reserve, South China B otanical Garden, Chinese Academ y of Science, Zhaoqing ; 2 Graduate School of the Chinese Academ y of Sciences, B eijing , China) Abstract: E rythrophleum ford ii is one of p recious endangered p lant species listed in the second grade of p rotected roster in Chinese Plant Red Book I. How to p rotect the rare population effectively in situ is the main aim of this study. B y analysis on investigated data of E. ford ii community in 1995 and 2002, some results were obained: ( 1) Based on dynam ics of population sizes in community succession, populations of C ryptoca rya concinna and C. chinensis had the trend to rep lace Erythrophleum fordii as the most dom inant species in the future. (2) From niche breadth and niche overlap analysis of species in the community, Erythrophleum fordii and Cryp tocarya concinna share sim ilar space source. The competition between them was intensive to seize space source. ( 3) D isturbance of insect outbreak changed the trend, decreased the populations of C ryptoca rya concinna and C. ch inensis enhanced the dom inant status of E. ford ii. Considering the situation above, it is thought that relying on enclosure manage2 ment to the community could not reach the aim of increasing the population of Erythrophleum fordii. For p rotecting the endangered species effectively, an initiative disturbing m easure should be taken to decrease the competitive de2 gree between Erythrophleum fordii and other main species in the community based on knowing the trend of the com2 munity succession and the main competitors to Erythrophleum fordii. Key words: endangered species; comm unity dynam ics; interspecies competition; disturbance; conservation strate2 gy ( E ryth rophleum fordii), 3 33 : : : ( ) ( KZ9512B12110) :(19652),,,, :

2 6 20 6,,,,1 hm 2,,, 1995, [ 1 ] [ 2 ] [ 3 ] Odum (1959),, [ 4 ] [ 5 ], ,, ; ;, [ 7 ] (1995 ), ( N, { E),, 20. 9, 81%, mm, 3,, 70%4 9 ; (Castanopsis chinensis) (Schim a ;, superba) ( Sarcosperm a lau rinum ) ( 1),,, (C ryptocarya concinna) (L indera cunnii),, ( E. fordii2c. concinna2l. cunnii Community),, cm m 2,> 1 cm ( ), : 2002, , I m, II m, III m, IV m, V > 15 m, 5 ; [ 6 ] ( important value) = + + Shannon - W iener : B i = - r ( P ij lnp ij ), B i, P ij j = 1 i j j, r (r = 5) Hurlbert : O ik = r P ij P ij, r ; C ij j j = 1 C j ,, I II,60. 0% 33. 8%,2.

3 3 67 8% ;,, I II III,, ; [ 8 ] 1 Table 1 Species composition of tree layers in the E. /%, ++,,,, fordii community Total ( E rythrophleum fordii) T (Cryptocarya concinna) T (L indera chunii) T (Castanopsis chinensis) T (Randia canthioides) S (M icrodesm is casearifolia) T (Aporosa yunnanensis) S (Cryptocarya chinensis) T 8. 6 (Sarcosperm a laurinum ) T 8. 0 (Schim a superba) T 7. 3 (Gironniera subaequalis) T 7. 2 (Syzygium levinei) T 5. 6 (Acenna acum inatissim a) T 5. 3 (Canarium album ) T 5. 1 (S terculia lanceolata) T 4. 9 (M achilus chinensis) T 4. 7 (Garcinia oblongifolia) T 4. 3 (Aquilaria sinensis) T 3. 5 (M em ecylin ligustrifolium ) T 3. 3 ( Pterosperm um lanceaefolium ) T 3. 0 (Acronychia pedunculata) T 2. 4 (Syzygium rehderianum ) T 2. 1 (M elioosm a rigida) T 1. 9 ( Engelhardtia roxburghiana) T 1. 8 (A rtocarpus styracifolius) T I m, II m, III m 2. 2 ( Thalassodes quadraria), 1985,, [ 9 ] ,, 8 a25%, ( 2) 1,2 3 8 a 20%, ,, : 2. 2, : (1. 51 ) > (1. 11 ) > (0. 96) > (0. 94) > (0. 37) > ( 0. 23) ( 3),,,

4 6 20 8,,, 2 Table 2 Species composition change of tree layers in the E. fordii community Table 3 Dom inant species coefficients of niche breadth in tree layers in E. fordii community I m, II m, III m, IV m, V > m ( 3),,,,,,,, , 20% ; 4 Table 4 The coefficients of niche overlap of E. fordii to other dom inant species in tree layer ,,, ,,, , ;,,

5 3 69, 3. 2,,, 2 [ 10 ],, 3. 3,,, ,, , ,, 4 [ 11 ],,,,,, [ 12 ], [ 3 ],,, 3 m, [ 2 ],,,,, [ 13 ],, [ 14 ],,,,,,, : [ 1 ],,,. [ J ]., 1982, (1) : [ 2 ],,. [ J ]., 1997, 17 (6) : [ 3 ],,,. [ J ]., 1999, 7 (1) : [ 4 ] J P ( ). [M ]. :, [ 5 ].. :, [ 6 ],. [ J ]., 1997, 17 (1) : [ 7 ],. V. [ J ]., 1985, (4) : [ 8 ],. [ J ]., 1982, (1) : [ 9 ]. [ J ]., 2000, 19 (3) : [ 10 ] Sp ies T A. Canopy gap s in Douglas fir forests of the Cascade Mountains[ J ]. Canadian Journal of Forest Research, 1990, 20 : [ 11 ] R ichard P,. [M ]. :, [ 12 ],. [ J ]., 2000, 22 (4) : [ 13 ],. [ J ]., 1987, 7 (3) : [ 14 ],,,. [ J ]., 1999, 10 (3) :