互花米草与短叶茳芏枯落物分解过程中碳氮磷化学计量学特征  

Carbon,nitrogen and phosphorus stoichiometric characteristics during the decomposition of Spartina alterniflora and Cyperus malaccensis var. brevifolius litters

作　　者：欧阳林梅[1] 王纯[1] 王维奇[1,2] 仝川[1,2] 

机构地区：[1]福建师范大学亚热带湿地研究中心,福州350007 [2]福建师范大学地理研究所,福州350007

出　　处：《生态学报》2013年第2期389-394,共6页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(31000209);福建省公益类研究所专项(2011R1037-5);福建省教育厅资助项目(JB11030)

摘　　要：为了揭示植物枯落物分解过程中元素生态化学计量学特征,对闽江河口湿地互花米草和短叶茳芏枯落物分解过程进行了测定。结果表明:整个分解期间内(2007年1—10月),在近潮沟生境和远潮沟生境,互花米草枯落物分解速率、氮磷养分含量低于短叶茳芏枯落物,但热值高于短叶茳芏枯落物;近潮沟生境,互花米草和短叶茳芏枯落物分解过程中平均C/N、C/P和N/P分别为70.5和34.7,2285.8和1210.7,32.8和35.4;远潮沟生境互花米草和短叶茳芏枯落物分解过程中平均C/N、C/P和N/P分别为72.7和33.2,2519.2和1167.0,34.0和35.9,两种生境下均表现为互花米草具有较高的C/N、C/P和较低的N/P;互花米草枯落物分解过程中具有较高的C/N和C/P,其分解速率较低。Ecological stoichiometry is the study of the balance of energy and multiple chemical elements.Generally,this perspective examines the causes and consequences of elemental imbalances between resources,producers,and consumers in the environment.C,N and P are key elements controlling organism growth.However,the relative needs of the elements are poorly quantified,and dependencies between elements are not well investigated.These three elements are strongly coupled in their biochemical functioning.Litter decomposition is a major source of nutrients to soil and the key process of biogeochemistry.Litter quality,the related microbe and the environmental factors all influence the litter decomposition rate.Nowadays,some researchers have examined the relationship of litter decomposition and the nutrient ecological stoichiometry,and proposed the ecological stoichiometry of C,N and P as the indication for litter decomposition and nutrition and energy release.The element ratios in wetlands,especially for the estuarine wetlands,appear to be more variable than other ecosystems.Moreover,the C,N and P stoichiometry during litter decomposition remains poorly understood. An amount of 18,000 km of coastline in China is covered by an estimated 12,000 km2 of tidal estuary wetlands.These tidal wetlands are generally rich in animal and plant diversity and appear to have important biogeochemical roles within the entire estuary ecosystem.One of these important tidal wetland ecosystems is found within the Minjiang River estuary in southeast China.This study was conducted in the Shanyutan wetland（119°34′12″—119°40′40″E,26°00′36″ —26°03′426″N）,which is the largest tidal wetland（nearly 3120 ha） in the Minjiang River estuary.The climate is warm and wet,with a mean annual temperature of 19.6 ℃ and a mean annual precipitation of 1346 mm.The Shanyutan wetland is belt-shaped.The sediment surface at the study site is submerged for 3—3.5 hours during each tidal inundation.The vegetation mainly occupies two zones：

关 键 词：碳 氮 磷 枯落物 化学计量学 闽江河口 

分 类 号：X173[环境科学与工程—环境科学]