3种温带森林土壤呼吸季节动态及其驱动机制  

SEASONAL DYNAMIC AND DRIVE MECHANISM OF SOIL RESPIRATION IN THREE TEMPERATE FORESTS

作　　者：张俊兴[1] 苏宏新[2] 刘海丰[2] 高润宏[1] 

机构地区：[1]内蒙古农业大学林学院,内蒙古010019 [2]中国科学院北京植物研究所植被与环境变化国家重点实验室,北京100093

出　　处：《内蒙古农业大学学报（自然科学版）》2011年第4期160-167,共8页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

基　　金：国家自然科学基金委青年科学基金(30900188)

摘　　要：本研究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北京东灵山地区3种温带森林土壤呼吸季节变化及其驱动机制。结果表明:3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;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、油松林土壤异养呼吸分别占总呼吸的80%、71%、77%,在3种林型之间的差异达到极显著水平(P<0.001)。土壤温度是影响土壤呼吸各组分的主要环境因子,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。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 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（P0.001）.The contributions of heterotrophic respiration to the total soil respiration of Oak forest,Larch forest and Pine forest were 80%、71%、77%.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.The autotrophic respiration was significantly correlated with fine root net input,while the heterotrophic respiration was significantly correlated with litter net input.

关 键 词：自养呼吸 异养呼吸 凋落物 细根 季节动态 土壤呼吸 

分 类 号：S714.3[农业科学—林学]