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孙宝玉,韩广轩,陈亮,王安东,吴立新,赵敏.短期模拟增温对黄河三角洲滨海湿地芦苇光响应特征的影响.生态学报,2018,(1).http://dx.doi.org/10.5846/stxb201611242401  
短期模拟增温对黄河三角洲滨海湿地芦苇光响应特征的影响
Effect of short-term experimental warming on photosynthetic characteristics of Phragmites australis in a coastal wetland in the Yellow River Delta, China
投稿时间:2016-11-24  修订日期:2017-07-26
DOI: 10.5846/stxb201611242401
关键词短期增温  光响应曲线  光合参数  芦苇  滨海湿地  黄河三角洲
Key WordsShort-term warming  photosynthetic-light response curve  light responsive parameters  Phragmites australis  coastal wetland  Yellow River Delta
基金项目
作者单位E-mail
孙宝玉 中国科学院烟台海岸带研究所 bysun@yic.ac.cn 
韩广轩 中国科学院烟台海岸带研究所 gxhan@yic.ac.cn 
陈亮 聊城大学环境与规划学院  
王安东 山东省黄河三角洲国家级自然保护区  
吴立新 山东省黄河三角洲国家级自然保护区  
赵敏 山东省东营市国土资源局  
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摘要:
黄河三角洲滨海湿地地下水位浅,淡咸水交互作用明显,其土壤水盐状况成为影响该地区生态系统关键过程的主要因子。另外,随着气候变暖,黄河三角洲在过去50 (1961-2010) 年进入显著升温阶段,温度升高直接或间接影响着植物的光合作用和光响应特征,从而影响黄河三角洲滨海湿地的演变。本研究采用红外辐射加热器模拟增温,分析增温对黄河三角洲滨海湿地生长季(2015年5月初-2015年10月底)芦苇光响应特征的影响。根据土壤含水量波动情况生长季可分为3个时期,即干旱期、淹水期和湿润期。结果表明,不同土壤水分条件下,芦苇光响应特征对增温的响应机制不同。干旱期,10cm土壤温度升高3.3 ℃,土壤水分含量降低了9.4%,土壤盐分含量升高了16.7%;水分亏缺与盐分增加使芦苇叶片在强光下发生光抑制,并且显著降低最大光合速率(Pnmax)、暗呼吸速率(Rd)、光补偿点(LCP)和光饱和点(LSP)。淹水期,增温对10 cm土壤温度、湿度和盐分均无显著影响,过饱和的水分状况限制叶片光合速率,使得Pnmax 达到最低。湿润期,10 cm土壤温度显著升高3.0 ℃,土壤含水量降低2.9%,而土壤盐分无显著差异;这一阶段,温度升高促进中强光下芦苇叶片的光合速率;同时叶片Pnmax、Rd和LSP分别增加27.7%、14.9%和23.3%。从整个生长季来看,增温使土壤温度显著升高2.9℃,土壤盐分含量升高7.0%,而对光合参数无显著影响。由此可见,在滨海湿地生态系统中,增温对光合作用的影响受土壤水盐状况的控制。
Abstract:
The coastal wetland in the Yellow River Delta has shallow underground water level and is affected by the fresh water and salt water. As a result, the conditions of soil water and salt become the main factors in the key processes of ecosystem. In addition, with climate warming, the average near-surface air temperatures of the Yellow River Delta had significantly rise in the last 50 years (1961-2010). Thus, warming can affect plant photosynthesis and photosynthetic characteristics directly and indirectly, consequently affecting the evolution of the coastal wetlands of the Yellow River Delta. A manipulative warming experiment was conducted in a coastal wetland in the Yellow River Delta using the infrared heaters. Light response curve of Phragmites australis was measured during the growing season. During each light response curve measurement, soil environmental parameters were measured simultaneously, including soil temperature, moisture and salinity. According to soil moisture condition, the whole growing season could be divided into three periods, the drought period, flooding period and wet period. The results showed that the effect of warming on photosynthetic characteristics of Phragmites australis was controlled by soil moisture condition. (1) During the drought period, soil temperature was significantly increased by warming by approximately 3.3℃. soil moisture was lowed by 9.4% and soil salt was increased by 16.7% compared with that in control. Similarly, the photosynthesis of Phragmites australis was suspended under intensive irradiation due to the water deficit and increased salt. Meanwhile, we detected warming significantly decreased maximum net photosynthetic rate (Pnmax), dark respiration rate (Rd), light compensation point (LCP), and light saturation point (LSP). (2) During the flooding period, no significant difference in soil temperature, moisture and salt content under warming. However, the photosynthesis of Phragmites australis was suspended due to the saturated soil water content. (3) During the wet period, warming increased the soil temperature at 10 cm depth by 3.0 ℃ and decreased the soil moisture by 2.9% , but had no effect on soil salt content compared with that in control. Meanwhile, warming increased photosynthetic rate under middle and high light condition and increased Pnmax, Rd and LSP significantly by 27.7%, 14.9% 23.3% respectively. (4) During the whole growing season, soil temperature at 10 cm depth was significantly increased by warming by 2.9 ℃ and soil salt content was increased by 7.0% compared with that in control. However, no significant effect on light responsive parameters under warming. Therefore, effect of warming on photosynthesis obviously controlled by the conditions of soil water and salt in the wetland ecosystem.
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