【作者】 贺静；

【导师】 王立新；

【作者基本信息】 内蒙古大学 ， 环境科学， 2014， 硕士

【摘要】 湿地生态系统碳循环是陆地生态系统碳循环的一个重要的分支,现已成为了研究全球变化和陆地生态系统循环中的一大热点。本文在2013年6月至9月利用LI-7000 H2O/CO2红外分析仪外接自制气室法对乌梁素海湖滨带中白刺、碱蓬、芦苇、藨草四种植物群落及生态系统CO2净交换、总呼吸、总光合的日动态和生长季动态及其影响的环境因子进行研究。该研究有助于进一步的了解湖滨带生态系统碳循环的过程,为湖滨带生态系统碳库的准确估测提供有价值的参考。研究结果如下：1.在生长季,乌梁素海湖滨带湿地生态系统CO2净交换、总呼吸及总光合都具有明显的梯度。2.在生长季,湖滨带生态系统C02净交换速率日动态呈单峰曲线,不同群落净交换日动态特征差异很大；生态系统净交换吸收峰值一般都出现在正午之前,日净吸收最大值(净交换最低值)约为5.37μmol*m-2*s-1;生态系统净交换速率峰值出现在7月份；影响湖滨带净交换速率的主要环境因子为光照有效辐射强度,而温度对不同群落的影响有所不同。3.在生长季,湖滨带湿地生态系统呼吸速率日动态呈单峰曲线；呼吸速率峰值出现的时间一般在正午或之后,呼吸速率的变化峰值基本与温度峰值的变化是同步的；不同群落及生态系统的呼吸速率生长季动态规律基本一致,其总呼吸速率的峰值出现在7月份,最低值出现在9月份；温度是影响湖滨带生态系统总呼吸速率的主要环境影响因子。4.在生长季,生态系统总光合速率日动态也表现出明显的日变化特征；不同群落及生态系统生长季动态规律基本一致,呈单峰曲线,7月份的总光合吸收值最大；群落间光合作用强度差别较大,在日尺度和季节尺度上,芦苇和蔗草群落的光合强度都远高于白刺和碱蓬群落。更多还原

【Abstract】 Carbon cycle of Wetland ecosystem is an important branch of carbon cycle of terrestrial ecosystem, it has become a big hot spot to the research of global change and cycle of terrestrial ecosystem.The text studies diurnal dynamic and dynamics of the growing season of Net CO2 Exchange, Total respiration, Photosynthesis of Nitraria sibirca Pall.、Suaeda glauca Bunge、Scirpus triqueter L.、Phragmites australis (Cav.)Trin. community and environment factors with LI-7000 H2O/CO2 infrared analyzer external homemade gas chamber method in lakeside of Wuliangsuhai in September 2013. The study is helpful to further understanding the process of carbon cycle of the lakeside ecosystem, provides valuable reference to correctly estimate carbon library of the lakeside zone ecosystem. The results were as follows:1.In the growing season, ecosystem Net CO2 Exchange, Total respiration and Total photosynthetic showed obvious spatial heterogeneity in wetland ecosystem of lakeside of Wuliangsuhai.2.During the growing season, diurnal dynamic of Net CO2 Exchange rate of lakeside zone ecosystem showed unimodal curve, the difference of characteristics of diurnal dynamic of Net exchange of different communities was very obvious; generally, absorption peak of Ecosystem net exchange appeared before noon, maximum (lowest) of diurnal net absorption is about-5.37μmol*m-2*s-1; peak of Ecosystem net exchange rate appeared in July; radiation intensity was the main environmental factors to affect net exchange rate of lakeside, and temperature was different influences of different communities.3.During the growing season, diurnal dynamic of Ecosystem respiration rate of lakeside wetland showed unimodal curve; peak time of Respiration rate was at noon or later; peak of Respiration rate and peak of temperature was the basic synchronization; the growing season dynamic of Respiration rate of different communities and ecosystem was the basic synchronization, peak of Total respiration rate showed in July, and the lowest showed in September; temperature was the main environmental impact factors of Respiration rate of lakeside zone ecosystem.4.During the growing season, diurnal dynamic of Ecosystem total photosynthetic rate also showed the obvious features of the diurnal change; the growing season dynamic of different community and ecosystem was the basic synchronization, presented a single-peak curve, the maximum Total photosynthetic uptake value showed in July; Photosynthesis intensity of communities was obviously different, on the length scales of day and season, Photosynthetic intensity of Phragmites australis (Cav.)Trin. and Scirpus triqueter L. was much higher than Nitraria sibirca Pall. and Suaeda glauca Bunge. community.更多还原