环境因子对沉水植物生长发育的影响机制-环境地理学专业论文.docx

接簧(Abstract)Influence 接簧(Abstract) Influence Mechanism ofEnvironment Factors on the Growth and Development of Submerged Macrophytes Abstract In the ecosystem of shallow lake,submerged macrophytes p|ay pivotal roles in the construction of healthyandstablefreshwatersystem,whose restorative anddecaying wasdo∞ly relatedtothe environmental factors．The impact of environmental factors like illumination and water temperature thegrowth anddevelopmentofsubmergedmacrophyteswouldhediscussed，providingtheevidencefor thea∞翻剿restorationofwaterenvironment． This artide woIlld study the e￡眙ct of the natural temperature the birth,growth and propagation ofPotamogeton cry,us with its bud and seedling objective by utilizing seasonal temperature change． Results revealed that the photosynthesis ofthe seedling wonid he inhibited at water耙m辨翱搬撵below 7C，while increased greaily at water temperature above秘lo℃with gradual rising of咒Z‰and△ Fv’|F0 and the gain of exhausted energy of photochemical quenching and photochemical quenching．Themostappropriatebreedingterdperaturewasaround20℃forPotamogeton cr／pua． When submerged macrophytes had grown up to of above w毫垂cf$UrfaCe纽spring and summer, more intense illumination and higher water temperature would be inhibitive harmful to the development of P．叻w and Vallisneria asiaaca L，but produce little effect OH^移r细Ph)d阮w spicatum and CerruophyHurn d8Hersnln，At time when只群赫#i℃ached the water stance at the end of spring,it Was easy for the floated leave畦p。cripus铀produce photoinhibition强t、F；and△Fi{F0 decreased markedly)．Despite higher photosynthesis，photosynthetic structure PSII Was easily harmed becau∞ofthelimiteddissipativecapabilitytoexcessiveenergy,resulting矗ltherapiddeclinationofthe photosynthetic ability and the decaying of the leaves,which suggested that瓤龋temperahtre and strong illumination wure the leading reasolls for the fading and death of只cr／eus in meg．The㈣WaS Silhiinr for M asiatica L．while different forM．sp／catum and C d．eraersu／n． 强皤cf weak iUu