若尔盖高寒草本沼泽木里薹草叶片碳氮磷化学计量特征对水位下降的响应  

Responses of leaf carbon,nitrogen,and phosphorus stoichiometry of Carex muliensis to water table drawdown in an alpine marsh on the Ruoergai Plateau,China

作　　者：赵丽 马骁 刘宏强 熊银洪 郭雪莲 李丽萍 董李勤[2] 张昆 ZHAO Li;MA Xiao;LIU Hong-qiang;XIONG Yin-hong;GUO Xue-lian;LI Li-ping;DONG Li-qin;ZHANG Kun(National Plateau Wetland Research Center,College of Wetland,Southwest Forestry University,Kunming 650224,China;School of Geography and Tourism,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学湿地学院,国家高原湿地研究中心,昆明650224 [2]西南林业大学地理与生态旅游学院,昆明650224

出　　处：《应用生态学报》2021年第7期2426-2432,共7页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41101097);云南省院士专家工作站(2019IC012);云南省基础研究计划项目(202001AT070132);云南省教育厅科学研究基金项目(2018JS346,2019J0184);国家科技基础资源调查专项(2019FY100603)资助。

摘　　要：2020年6—9月,以若尔盖高原纳勒乔沼泽水位下降模拟控制实验平台为依托,在若尔盖县纳勒乔沼泽原位切割1 m×1 m原状土块,原位抬升20 cm,原位模拟水位下降20 cm,研究湿地植物木里薹草碳氮磷化学计量特征对水位下降的响应。结果表明:在整个生长季,木里薹草叶片C含量没有显著变化,N、P含量随着生长季的推移逐渐下降。水位下降后,叶片C含量在生长季的变化并不一致,在生长初期、中期水位下降导致C含量增加,生长旺期无显著变化;叶片N含量对水位下降的响应为显著升高,叶片P含量则显著降低。叶片C∶N、C∶P、N∶P在整个生长季内均表现为随季节变化而上升,木里薹草的相对生长速率与叶片C∶N呈显著正相关,与C∶P和N∶P呈显著负相关。水位下降后,叶片C∶N显著降低,C∶P和N∶P显著上升,导致木里薹草的相对生长速率显著降低。水位下降后,叶片P含量降低是木里薹草单叶质量和比叶重下降的主要调控因子。Based on a field water table drawdown manipulation platform of Naleqiao marsh on the Rueorgai Plateau,we lifted in situ soil block of 1 m×1 m by 20 cm for simulating water table decline,and analyzed the response of carbon,nitrogen,and phosphorus stoichiometry in the wetland species Carex muliensis from June to September 2020.The results showed that there was no significant difference in leaf C content during the whole growing season,while N and P content gra-dually decreased along the growing season.After the drawdown of water table,the C content in leaves during the growing season was not consistent.Water table drawdown increased leaf C content in the early and middle growth stages,but changed little in the peak growth stage.Water table drawdown significantly increased leaf N content,while significantly decreased leaf P content.C:N,C:P,and N:P for leaves all increased along the whole growing period.The relative growth rate of C.muliensis was positively correlated with leaf C:N,but negatively correlated with leaf C:P and N:P.Water table drawdown significantly decreased leaf C:N,while significantly increased leaf C:P and N:P,which significantly reduced the relative growth rate of C.muliensis.The decrease of foliar P content induced by water table drawdown was the main regulating factor for the decrease of single leaf weight and specific leaf weight.

关 键 词：碳氮磷计量比 木里薹草 水位下降 若尔盖高原 

分 类 号：Q948[生物学—植物学]