【作者】 张俊兴；

【导师】 高润宏； 苏宏新；

【作者基本信息】 内蒙古农业大学 ， 生态学， 2011， 硕士

【摘要】 土壤呼吸驱动机制的研究对于估算森林土壤碳储量和预测未来气候变化条件下森林土壤呼吸的响应有重要意义。本研究应用红外线CO2分析仪(IRGA,LI-8100)对北京东灵山地区的辽东栎(Quercus liaotungensis Koidz.)林、华北落叶松(Larix principis-rupprechtii Mayr.)林和油松(Pinus tabuliformis Carr.)林等三种典型温带森林生态系统的土壤呼吸进行了生长季内的动态监测,并通过壕沟法定量区分自养呼吸和异养呼吸,结合各种监测因子初步探讨其驱动机制。结果表明:1.三种森林生态系统的土壤呼吸、异氧呼吸和自养呼吸呼吸速率均呈现明显的季节变化。2.异养呼吸在土壤呼吸中占较大比重,辽东栎林、华北落叶松林、中国油松林土壤异养呼吸分别占总呼吸的80%、71%、77%,在三种林型之间的差异达到极显著水平(P<0.001)。3.土壤温度是影响土壤呼吸各组分的主要环境因子,但土壤温度对土壤呼吸的驱动机制在不同的林型之间差异明显。4.影响土壤呼吸的生物因子在不同林型间存在差异,细根净输入量很大程度上决定了自养呼吸的总量,凋落物净输入量对于异养呼吸有重要影响。更多还原

【Abstract】 Based upon the field data on seasonal dynamic of soil respiration in three temperate forests, we could obtain the response of soil respiration, autotrophic respiration and heterotrophic respiration to the soil temperature, soil water moisture, leaf area index, fine root biomass, fine root turnover and litter turnover in Donglinshan mountain. The relationship proposed for soil respiration with these factors was useful for understanding and predicting potential changes in Beijing Donglinshan mountain forest ecosystem in response to forest management and climate change.We used trench method to sepetate components of soil respiration in three typical forestlands. A study was conducted to determine the seasonal dynamic of soil respiration and the drive mechanism of the changes in temperate forests in Donglingshan mountain from April to October in 2010. Results indicated that:1. the total soil respiration, heterotrophic respiration and autotrophic respiration of three temperate forests followed a similar seasonal trend, and heterotrophic respiration differences in forest types (P<0.001).2. The contributions of heterotrophic respiration to the total soil respiration of Oak forest, Larch forest and Pine forest were 80%、71%、77%.3. For all forest types, the soil respiration, autotrophic respiration and heterotrophic respiration were significantly influenced by soil temperature. But the drive mechanism of soil respiration was complicated.4. The autotrophic respiration was significantly correlated with fine root net input, while the heterotrophic respiration was significantly correlated with litter net input.更多还原