, 1, 3, 3. Stud ies on the In terspec if ic A ssoc iation of Canopy Trees in D avid ia

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1 2003, 21 (3): J ourna l of W uhan B otan ica l Resea rch 1, 1, 2, 1 Ξ, 1, 3, 3 (1. g, ; 2., ; 3., ) : 2 2, ς 2 (A c) D ice (D I) :, 4,, ; 10,, : ; ; ; ; D ice : Q : A : X (2003) Stud ies on the In terspec if ic A ssoc iation of Canopy Trees in D avid ia involu ra ta Comm un ity of M ṫ Seven- sister in W estern Hube i HU L i2l e 1, L I X in 1, 2, J IAN G M ing2x i 1Ξ, HUAN G H an2dong 1, M AN J in2shan 3, SU Chang2J iang 3 (1. W uhan B otan ica l Ga rd engw uhan Institu te of B otany, T he Ch inese A cad emy of S ciences, W uhan , Ch ina; 2. Y ichang F orestry S chool, Yichang, H ubei , Ch ina; 3. X uan en F orestry B u reau, Xuan en, H ubei , Ch ina) Abstract: Based upon a 2 2 con tingency tab le, a series of techn iques including ς 2 test, association coefficien t and D ice index w ere u sed to determ ine the in terspecific association in D av id ia involu ra2 ta Comm un ity of M ṫ Seven2sister. T he resu lts w ere exp ressed in the fo rm s of sem i2m atrix and con stellation figu res, and indicated that the in terspecific association w as of little sign ifican t level, on ly fou r pairs of species exh ib ited sign ifican tly po sitive association. T here w as a low association degree betw een mo st pairs of species; m eanw h ile few pairs of species w ere ex trem ely exclu sive to each o ther. Involu ra ta w ere ex trem ely po sitively associated w ith L ithoca rp us hen ry i, M eliosm a cuneif olia, A ra lia ch inensis and D ap hn ip hy llum m acrop od um, bu t ex trem ly negatively associated w ith P ad us w ilson ii. D av id ia involu ra ta, P hoebe shea reri, Cam ellia caud a ta,w ho se impo rtance val2 ues ranked first, w ere sligh tly associated w ith each o ther, and they occup ied their ow n n iches re2 spectively, competing sligh tly fo r environm en tal resou rces. T he fact that C. caud a ta w ere ex trem e2 ly po sitively associated w ith ten species show ed its stab le p lace in comm un ity and its impo rtan t ro le in m ain tain ing the stab le structu re of D av id ia involu ra ta Comm un ity. H en ry i perhap s w as a keystone species, becau se it w as ex trem ely po sitively associated w ith the th ree p lan ts, w ho se im 2 po rtance values ranked firsṫ F inally, it w as p ropo sed how to app ly in terspecific association mo re Ξ : , : : : (1979- ),,, (E2m ail: hulile96@ sohu. com )

2 efficien t ly. Key words: D av id ia involu ra ta Baill. ; In terspecific association; M ṫ Seven2sister; A ssociation co2 efficien t; D ice index (D av id ia involu ra ta ),,,,,,,,,,,,,, 1869 Jean P irre A rm and D avidia,, [1 ] [2 ] [3 ] [4, 5 ] [6 ] [7 ] [8 10 ] [11 13 ] [14 ],, [12 ],,,, 1999 [15 ], 6,, ς 2,, ,, , m (1 660 m ), 819, (7 ) 1913, (1 ) - 211, 35, mm,, 21%, 84% [16 ] m, , 2,, 2 20 m 60 m 40 m 40 m m 2, 1 1 T able 1 T he info rm ation of tw o samp les (m ) (m 2 ) N o. A rea A ltitude Gradient Slope direction Location Q SW 66 Q WN m 10 m, : ; ; , ς 2 [17 ] 2 2 1, a 2 ; b c 2 1 ; d 2 ς = 31841, ς = ς 2 < 31841, ; 31841< ς 2 < 61635, ; ς 2 > 61635, 3 : ad> bc,, ; ad< bc,, ; ad= bc,,, (A ssociation coeffi2

3 3 : 205 cien t) [17 ] D ice (D ice index) [18 ] 37, ς 2, 1413% 19 2 (, ) ς 2 (Con2 stellation chart), A c D ice (H alf2m atrix diagram ) 2 19 T able 2 T he info rm ation of testing canopy trees N o. Species (% ) F requency (% ) İ V. 1 Cam ellia caud ata W all P hoebe sheareri (H em sl. ) Gam ble A cer f ranchetii Pax D av id ia involu rata Baill N eolitsea au rata (H ay. ) Ko idz P ad us w ilsonii Schneid Cy clobalnop sis g lauca (T hunb. ) O ersṫ L ithocarp us henry i (Seem. ) R ehd. et W ils A escu lus w ilsonii R ehd A cer sinense Pax P terosty rax p silop hy llus D iels ex Perk P terocary a hup ehensis Skan M eliosm a cuneif olia F ranch D iospy ros K ak i T hunb. vaṙ sy lvestris M ak S ym p locos botry antha F ranch S ym p locos sum untia Buch. 2H am. ex D. Don T etracentron sinense O liv A ralia ch inensis L inn D ap hnip hy llum m acrop od um M iq , 75% 85% ;, 15%, 3, 18 m,, 276 cm, 10 m 18 m, ; 10 m,,,, 2113%,, 2,,, 1311% 1115%,,,,, 9219%,, (S orbus hup ehensis) ; (P ilea nota ta), (Ca rex la tticep s) (Op h iorrh iz a jap on i2 ca) (H eracleum hem sley anum ) (D ry op teris ch inensis) (E uonym us f ortunei) (H ed era nep a lensis), 2. 2 ς 2 :, 4 (1),,

4 206 21, 3 :,,,,, F ig. 1 1 ς 2 Constellation chart based on ς 2 2test : 2 ( 23 ) N o te: T he m eaning of the digits in th is chart can be found in T able 2 ( It is the sam e w ith chart 2 and chart 3) 3 3 (D ice ) F ig. 3 H alf2m atrix diagram of interspecific association (D ice index) 2 (A c ) F ig. 2 H alf2m atrix diagram of interspecific association (A c) ad2bc : 127, 44 2 : - 012< A c 012,A c - 014,,, 10 ;,,, [18 ] , 44, ς 2 : 4,, 28, ς 2, ς 2,,, ; ς 2,, ς 2,

5 3 : 207,, 20 m 4017%,,,,,, 3,,,,, 100 cm,, 10,,, 9219%,,,,, 3, 5,,,,,,,,,,,,,,,,,,,,,, :, ;, [19 ],,,,, (M u ltispecies association) [20 ], : [ 1 ]. [J ]., 1994, 16 (4): [ 2 ]. [J ]., 1995, 17 (1): [ 3 ]. [J ]., 1987, 7 (4): [ 4 ]. [J ]., 1995, 17 (3): [ 5 ]. [J ]., 1995, 15 (4): [ 6 ]. [J ]., 1999, 33 (4): [ 7 ]. [J ]., 1989, 31 (7): [ 8 ]. [J ]., 1995, 12 (): [ 9 ]. [J ]., 1999, 23 (6): [10 ]. [J ]., 1998, 16 (1): [ 11 ]. [J ]., 2000, 11 (4): [12 ]. [J ]., 1990 (3):

6 [13 ]. [J ]., 1995, 3 (4): [14 ]. [M ]. :, [15 ]. [J ]., 1999, 24 (5): 16 17, 50. [16 ]. Dovetree comm unity of M ṫ Seven2sister in W estern H ubei & its p ro tective strategies[j ]. (), 1990, 24 (3): [17 ]. [J ]., 1997, 6 (1): [18 ]. [J ]., 1995, 19 (2): [ 19 ]. [J ] , 21 (5): [20 ] M ark R T D ale. Spatial Pattern A nalysis in P lant E2 co logy[m ]. N ew Yo rk: Cam bridge U niversity P ress,