长江口芦苇和互花米草叶面积生长对立地增温的响应  

Response of the leaf area growth of Phragmites australis and Spartina alterniflora to elevated temperatures at the Yangtze River estuary

作　　者：李沙沙[1,2] 樊同 张超[3,4] 朱红雨 周婷南 吴悦琦 贺贵书 王开运[1,2] 李海禹 毕星 LI Shasha;FAN Tong;ZHANG Chao;ZHU Hongyu;ZHOU Tingnan;WU Yueqi;HE Ouishu;WANG Kaiyun;LI Haiyu;BI Xing(College of Ecology and Environment,East China Normal University,Shanghai 200241,China;Shanghai Key Laboratory of Urbanization and Ecological Restoration,East China Normal University,Shanghai 200241,China;College of Geography,East China Normal University,Shanghai 200241,China;Key Laboratory of Geographic Information Science of Ministry of Education,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学生态环境学院,上海200241 [2]上海市城市化生态过程与生态恢复重点实验室,上海200241 [3]华东师范大学地理科学学院,上海200241 [4]华东师范大学地理信息科学教育部重点实验室,上海200241

出　　处：《应用与环境生物学报》2018年第6期1247-1253,共7页Chinese Journal of Applied and Environmental Biology

基　　金：国家科技支撑计划项目(2010BAK69B15);上海市科委科技项目(10dzl200602);国家自然科学基金项目(31500392);河口海岸学国家重点实验室开放基金(SKLEC-KF201411)资助~~

摘　　要：采用开顶式生长室(Open top chambers,OTCs)模拟立地增温的方法(4个OTC,4个对照),研究芦苇(Phragmites australis)和互花米草(Spartina alterniflora)实生苗顶叶面积、单株总叶面积和叶面积指数(LAI)对增温(OTC内空气年平均气温增加了2.00±0.17℃)的响应.结果显示:(1)与对照相比,一年生长后芦苇和互花米草LAI分别显著增加.芦苇LAI于9月份达到峰值,增加了5.40%;而互花米草呈现持续增加趋势,于10月份达到峰值,增加了7.00%(P <0.05).(2)芦苇顶叶面积于8月份达到峰值,增加了12.94%;互花米草于9月份达到峰值,增加了23.96%.同时增温使互花米草顶叶面积伸展延后3 d.(3)芦苇单株总叶面积于9月份达到峰值,增加了9.36%;而互花米草于10月份达到峰值,与对照相比,增加了20.26%.上述结果表明在未来大气增温条件下,互花米草叶生长对大气增温的响应比芦苇更加敏感.To investigate the response of plant growth in the Yangtze Estuary wetland ecosystem to warming, we use open top chambers (OTCs) to simulate site warming (4 OTCs and 4 controls), monitoring the area of the top leaf, the total leaf area, and the leaf area index of Phragmites australis and Spartina alterniflora under higher temperatures (the average annual air temperature in OTC increased by 2.00 ± 0.17 ℃). The results showed that: (1) compared with the control, the leaf area index of P. australis and S. alterniflora significantly increased after one year of growth. The leaf area index of P. australis peaked in September, increasing of about 5.40%;while that of S. alterniflora continued to increase, reaching its peak in October, reaching an increment of about 7.00% (P<0.05). (2) The area of the top leaf of P. australis reached its peak in August, and increased about 12.94%. S. alterniflora peaked in September with an increase of 23.96%. The higher temperature delayed the spread of the top leaf area of S. alterniflora by about 3 days. 3) The total leaf area of P. australis reached its peak in September, and increased by 9.36%;while S. alterniflora peaked in October, and increased by 20.26% compared to the control. These results show that leaf growth of S. alterniflora will be more sensitive to future increasing atmospheric temperature conditions than that of P. australis.

关 键 词：立地增温 互花米草 芦苇 叶面积生长 开顶式生长室 

分 类 号：Q148[生物学—生态学]