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引用本文:施娴,陈开宁,黄蔚,杨鑫.不同温度培养下莕菜(Nymphoides peltata)生长与光合作用特征.湖泊科学,2013,25(4):545-550. DOI:10.18307/2013.0412
SHI Xian,CHEN Kaining,HUANG Wei,YANG Xin.Growth and photosynthesis characteristics of the Nymphoides peltata under different temperatures. J. Lake Sci.2013,25(4):545-550. DOI:10.18307/2013.0412
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不同温度培养下莕菜(Nymphoides peltata)生长与光合作用特征
施娴1,2, 陈开宁1, 黄蔚1,2, 杨鑫1,2
1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;2.中国科学院大学, 北京 100049
摘要:
以太湖东山与西山之间水域的莕菜根茎为实验材料,在室内分别进行3种温度(28、30、32℃)处理,利用Li-6400便携式光合作用测量系统,分别测定3种温度处理下莕菜的光响应曲线和CO2响应曲线,并且利用非直角双曲线法进行拟合,得到相关参数.结果表明,3种温度下,莕菜的光合能力大小顺序表现为30℃ >32℃ >28℃,羧化效率为32℃ >30℃ >28℃,蒸腾速率、气孔导度均为30℃ >28℃ >32℃;28、30和32℃下的单位叶片生物量分别为0.0019±0.0002、0.0021±0.0003、0.0020±0.0003 g(DW)/cm2,叶片及其单位面积生物量为30℃ >28℃ >32℃,但差异不显著;30℃下的根、茎干重显著高于另外2个温度下的.在低于30℃的温度条件下,随着温度的升高,莕菜的光合能力均明显升高,促进了植物的生长;而当温度超过30℃后,光合作用效率降低,植物的生长则受到抑制.在适宜温度范围内(<30℃),小幅度的升温(2℃)产生了显著的积温效应(200℃·d),促进了莕菜的生长.因此推断,1998 2006年太湖地区平均气温升高约1.0℃的现象对近年来太湖莕菜的大面积扩张可能具有促进作用.
关键词:  莕菜  光合作用  生物量  积温
DOI:10.18307/2013.0412
分类号:
基金项目:国家自然科学基金项目(41171413);国家水体污染控制与治理科技重大专项项目(2012ZX07103-002)联合资助
Growth and photosynthesis characteristics of the Nymphoides peltata under different temperatures
SHI Xian1,2, CHEN Kaining1, HUANG Wei1,2, YANG Xin1,2
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China;2.University of Chinese Academy of Sciences, Beijing 100049, P.R.China
Abstract:
Roots of Nymphoides peltata collected from Lake Taihu were cultured under three different temperatures (28,30, 32℃).The biomass under such different temperature conditions were 0.0019±0.0002,0.0021±0.0003 and 0.0020±0.0003 g (DW)/cm2,respectively.Meanwhile,the dry weight of stem and root was maximum under 30℃ than other treatments that had significant difference;the order of the dry weight and biomass per unit area of leave was 30℃ > 28℃ > 32℃.Light response curves and ACI curves were determined by a Li-6400 portable photosynthesis analysis system,and the non-rectangular hyperbolic method was used to fit the curve to obtain relevant photosynthetic parameters.The results showed that the influences of temperature on order of N.peltata photosynthetic capacity was 30℃ > 32℃ > 28℃,the order of carboxylation efficiency was 32℃ > 30℃ > 28℃,transpiration efficiency and stomatal conductance showed the same trend,30℃ > 28℃ > 32℃.The photosynthetic capacity of N.peltata increased significantly with the increasing temperature,and the growth of N.peltata was promoted;however,the photosynthetic efficiency reduced when the temperature exceeded 30℃ with the suppression of N.peltata.In the appropriate temperature range(< 30℃),small amplitude warming(2℃) produced a significant effect of accumulated temperature(200℃·d), which promote the growth of N.peltata.It is deduced that the phenomenon that the average temperature of Lake Taihu increased about 1℃ during 1998 2006 may promote the expansion of N.peltata in Lake Taihu in recent years.
Key words:  Nymphoides peltata  photosynthesis  biomass  accumulated temperature
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