广西植物2012，Vol.32Issue(6)：715-722,8.DOI:10.3969/j.issn.1000-3142.2012.06.001
崇明东滩湿地芦苇和互花米草N、P利用策略的生态化学计量学分析
Ecological stoichiometrical analysis on the strategies of utilization of nitrogen and phosphorus in Phragmites australis and Spartina alterni flora in Chongming Dongtan wetland
摘要
Abstract
N and P contents and N : P in different organs of Phragmites australis and Spartina alterni flora and habitat soil in the typical plant community in Chongming Dongtan wetland were measured. Based on the seasonal dynamics and the strategy of N and P utilization of the two species were analyzed using the theory of ecological stoichiomet- ry. The results showed that the contents of N and P in the two species differed significantly,and the order was P. au-stralis>S. alterniflora. The contents of N and P in different species and the different organs of the same species differed in course of plant growth. The allocation of N and P in different organs of P. australis and S. alterni flora was in the order of leaf>stem>root. N and P contents of the above-and below-ground parts of the two species, was in the order of May>September>July. Accumulation of N and P in P. australiswas higher than those in S. alterniflo-ra. The contents of N and P in the above-ground parts of the two species differed significantly. N contents in S. alterni flora habitat soil were more than those of P. australis. Only in May, soil P contents in S. alterni flora habitats were more than that in P. australis,but in July and September, soil P contents in P. australismore than those in S. alterni flora habitats. N contents in leaves of P. australis were not significantly correlated with those in its habitat soil, while P contents in leaves of P. australis were significantly positively correlated with P contents in its habitat soil. The N contents in leaves of S. alterni flora were significantly positively correlated with soil N contents in its habitat soil, while P contents in leaves of S.. alterni flora were not significantly correlated with P contents in its habitat soil. The N : P ratio in leaves of and S. alterni flora had no significant correlation with N, P contents and N : P in habitat soil. At the early and last growth stage, N : P<14 for P. australis, suggesting the growth of P. australis at these stages were N-limited,but at the fast growth stage,14<N : P<16 for P. australis,suggesting the growth of P. australis at this stage was N-and P-limited. For S. alterni flora,N:P<14 in May, July and September, suggesting that the growth of S. alterni flora was N-limited. Generaly,the primary productivity of P. australis and S. alterni flora was N-limited at most cases. N and P contents and N : P in different organs of Phragmites australis and Spartina alterni flora and habitat soil in the typical plant community in Chongming Dongtan wetland were measured. Based on the seasonal dynamics and the strategy of N and P utilization of the two species were analyzed using the theory of ecological stoichiomet- ry. The results showed that the contents of N and P in the two species differed significantly,and the order was P. au-stralis>S. alterniflora. The contents of N and P in different species and the different organs of the same species differed in course of plant growth. The allocation of N and P in different organs of P. australis and S. alterni flora was in the order of leaf>stem>root. N and P contents of the above-and below-ground parts of the two species, was in the order of May>September>July. Accumulation of N and P in P. australiswas higher than those in S. alterniflo-ra. The contents of N and P in the above-ground parts of the two species differed significantly. N contents in S. alterni flora habitat soil were more than those of P. australis. Only in May, soil P contents in S. alterni flora habitats were more than that in P. australis,but in July and September, soil P contents in P. australismore than those in S. alterni flora habitats. N contents in leaves of P. australis were not significantly correlated with those in its habitat soil, while P contents in leaves of P. australis were significantly positively correlated with P contents in its habitat soil. The N contents in leaves of S. alterni flora were significantly positively correlated with soil N contents in its habitat soil, while P contents in leaves of S.. alterni flora were not significantly correlated with P contents in its habitat soil. The N : P ratio in leaves of and S. alterni flora had no significant correlation with N, P contents and N : P in habitat soil. At the early and last growth stage, N : P<14 for P. australis, suggesting the growth of P. australis at these stages were N-limited,but at the fast growth stage,14<N : P<16 for P. australis,suggesting the growth of P. australis at this stage was N-and P-limited. For S. alterni flora,N:P<14 in May, July and September, suggesting that the growth of S. alterni flora was N-limited. Generaly,the primary productivity of P. australis and S. alterni flora was N-limited at most cases. N and P contents and N : P in different organs of Phragmites australis and Spartina alterni flora and habitat soil in the typical plant community in Chongming Dongtan wetland were measured. Based on the seasonal dynamics and the strategy of N and P utilization of the two species were analyzed using the theory of ecological stoichiomet- ry. The results showed that the contents of N and P in the two species differed significantly,and the order was P. au-stralis>S. alterniflora. The contents of N and P in different species and the different organs of the same species differed in course of plant growth. The allocation of N and P in different organs of P. australis and S. alterni flora was in the order of leaf>stem>root. N and P contents of the above-and below-ground parts of the two species, was in the order of May>September>July. Accumulation of N and P in P. australiswas higher than those in S. alterniflo-ra. The contents of N and P in the above-ground parts of the two species differed significantly. N contents in S. alterni flora habitat soil were more than those of P. australis. Only in May, soil P contents in S. alterni flora habitats were more than that in P. australis,but in July and September, soil P contents in P. australismore than those in S. alterni flora habitats. N contents in leaves of P. australis were not significantly correlated with those in its habitat soil, while P contents in leaves of P. australis were significantly positively correlated with P contents in its habitat soil. The N contents in leaves of S. alterni flora were significantly positively correlated with soil N contents in its habitat soil, while P contents in leaves of S.. alterni flora were not significantly correlated with P contents in its habitat soil. The N : P ratio in leaves of and S. alterni flora had no significant correlation with N, P contents and N : P in habitat soil. At the early and last growth stage, N : P<14 for P. australis, suggesting the growth of P. australis at these stages were N-limited,but at the fast growth stage,14<N : P<16 for P. australis,suggesting the growth of P. australis at this stage was N-and P-limited. For S. alterni flora,N:P<14 in May, July and September, suggesting that the growth of S. alterni flora was N-limited. Generaly,the primary productivity of P. australis and S. alterni flora was N-limited at most cases.关键词
芦苇/互花米草/N、P含量/季节变化/土壤/崇明东滩湿地Key words
Phragmites australis/ Spartina alterni flora/ contents of N and P/seasonal dynamic/ habitat soil/Chongming Dongtan wetland分类
农业科技引用本文复制引用
赵美霞,李德志,潘宇,吕媛媛,高锦瑾,程立丽..崇明东滩湿地芦苇和互花米草N、P利用策略的生态化学计量学分析[J].广西植物,2012,32(6):715-722,8.基金项目
国家自然科学基金(31170387) （31170387）
国家'十一五'科技支撑重大项目(2006BAC01A14) （2006BAC01A14）
上海市科委崇明生态建设重大项目(06DZ2303) （06DZ2303）
