Niche Of Dominant Populations Of Wetland Plants In Islets Of Poyang Lake

Based on the sample niche and environmental resources based on the dimension of niche, for poyang lake wetland bottomland advantage study plant species niche. Main analysis Carex scabrifolia Steud,Carex cinerascens Kukenth,Cardamine lyrata Bunge.,Polygonum hydropiper Linn,Triarrhena lutarioriparia L. Liou,Phalaris arundinacea Linn,Polygonum strigosum R. Br,Polygonum criopolitanum Hance,Artemisia somai,Carex doniana Spreng,Eleocharis valleculosa Ohwi,Polygonum japonicum var. japonicum,Panicum bisulcatum Thunb.,Rorippa indica (Linn.) Hiern,Cotula anthemoides,Hemarthria altissima,Phragmites australis (Cav.)Trin. ex Steud,Carex argyi Levl. et Vant,Arundinella anomala Stend,Carex ovatispiculata Y. L. Chang ex S. Yun Liang,Carex unisexualis C. B. Clarke.,Kummerowia striata (Thunb.) Schindl. and other compositely 22 species advantage of wetland plants niche breadth and niche overlap. Main results are as follows:Niche breadth features. Based on the sample niche breadth, scabrifolia Carex Steud (0.292), cinerascens Carex Kukenth (0.258) is wider unisexualis Carex niche, c. b. Clarke. (0.024), Kummerowia striata (Thunb.) Schindl. (0.022) has a narrow niche; Based on NO3-N niche breadth, scabrifolia Carex Steud (0.547), hydropiper Linn (0.506) is wider niche, Cotula (0.180), Kummerowia anthemoides (Thunb.) striata (Schindl. (0.100) has a narrow niche; Based on NH4+-N niche breadth, hydropiper Linn (0.697), scabrifolia Carex Steud (0.659) is wider unisexualis Carex niche, c. b. Clarke. (0.100), Cotula anthemoides (0.100) has a narrow niche; Based on SOC niche breadth, scabrifolia Carex (0.665), Triarrhena Steud (lutarioriparia 1. Liou (0.608) is wider niche, Kummerowia striata Thunb.(0.186), Schindl. Cav Phragmites australis Trin. Ex Steud. has (0.184) a narrow niche; The niche breadth based on TN, scabrifolia Carex Steud (0.811), cinerascens Carex Kukenth (0.782) is wider niche, Arundinella anomala (0.200), Kummerowia Stend (Thunb.) striata (Schindl. (0.186) has a narrow niche; Based on the TP niche breadth, scabrifolia Carex Steud (0.762), cinerascens Carex Kukenth (0.746) is wider niche, Kummerowia striata (Thunb.) Schindl. (0.186), Arundinella anomala Stend (0.185) has a narrow niche; Based on these SWC's niche breadth, scabrifolia Steud (0.624)Carex Phalaris arundinacea, Linn (0.598) has a wide niche. Unisexualis c. b. Carex Clarke. (0.100), ovatispiculata Y 1. Carex Chang ex s. Yun Liang (0.100), Kummerowia striata (Thunb.) Schindl. (0.100) has a narrow niche.Niche overlap features. Based on the sample of 105 to produce jackknife,45%, overlapping value bigger have Carex ovatispiculata Y 1. Liang Yun Chang ex s. japonicum var. Polygonum japonicum (0.797), Cotula anthemoides Polygonum criopolitanum Hance (0.674); Based on NO3-N 229 kind to produce jackknife, 99.1%, overlapping value bigger have Cotula Arundinella anomala anthemoides and Stend unisexualis Carex (0.983), c. b. Phragmites australis (Clarke. And Cav.) Trin. Ex Steud (0.947); Based on NH4+-N have 220, accounting for to produce jackknife diseases was 95.2%; bigger have overlapping value criopolitanum Hance and Artemisia somai Polygonum (0.997), criopolitanum Polygonum (Carex argyi Levl Hance Vant (0.996); Based on SOC have 220, accounting for to produce jackknife diseases was 95.2%; bigger have overlapping value Arundinella anomala Kummerowia striata Thunb Stend and Schindl. (0.997), Cotula anthemoides and Rorippa Linn.indica Hiern (0.945); 221 based on to the TN, which produce jackknife 95.7%, overlapping value bigger have Arundinella anomala Kummerowia striata Thunb Stend and Schindl. (0.974), Phalaris arundinacea Polygonum japonicum var. Linn and japonicum (0.931); Based on the TP to produce jackknife of 211, accounted for a 91.3%bigger have overlapping value, criopolitanum Polygonum Cotula anthemoides (0.980)Hance and Artemisia somai, Phalaris arundinacea Linn (0.935); Based on these SWC have to produce jackknife,20287.4%, overlapping value of bigger have Cotula Carex argyi anthemoides and 0.987 Vant Levl. Et anthemoides and Cotula Phragmites, australis (Cav.) (0.907).To sum up, niche breadth based on sample and environmental resources dimension change trend based on similar scabrifolia Carex Carex cinerascens Kukenth Steud, Bunge. Cardamine lyrata, hydropiper Polygonum Linn, etc, niche breadth wider, c. b. Carex unisexualis Clarke Kummerowia striata (Thunb j, the Schindl. J) narrow niche breadth; Niche overlap based on sample and based on environmental resources dimensions of overlap each are not identical, poyang lake wetland bottomland plant species niche in the advantage of environmental resources dimensions appear differentiation.