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东灵山3种落叶阔叶林的碳氮元素含量及比率

期刊名称：林业科学, 45(08), 82-87.
时间：0
分类：S718.554[农业科学—林学]
作者机构：[1]中国科学院植物研究所,北京100093, [2]中国科学院研究生院,北京100049, [3]北京市门头沟区绿化委员会,北京102300
相关基金：北京市科委重大项目“北京山区森林健康经营关键技术研究与示范”（D0706001000091）;国家自然科学基金项目（30590382）资助.感谢中国科学院北京森林生态系统定位研究站孙汝才、林燊、白帆和王敏同志在工作中给予的极大帮助.
相关项目：我国主要陆地生态系统对全球变化的响应和适应性样带研究

关键词：碳氮含量, 碳氮比, 暖温带落叶阔叶林, 生态系统, 化学计量学, 东灵山, C and N contents, C：N ratio, warm temperate deciduous broadleaf forest, ecosystem, stoichiometry, Dongling Mountain

中文摘要：

研究暖温带东灵山3种落叶阔叶林的碳氮元素含量和C：N比率的化学计量特征。结果表明：1）土壤和乔木层的碳元素含量表现为白桦林〉辽东栎＋棘皮桦混交林〉辽东栎林，氮元素含量在辽东栎＋棘皮桦混交林中最高，为另外2种林型含量的2倍，而3种林型的土壤微生物碳氮元素含量之间没有显著差异；2）不同林型土壤微生物的C：N比率变动很小，并且不受土壤碳氮含量变化的影响；3）3种林型土壤和土壤微生物的C：N比率变化不大，表现出受限制的化学计量学特征。

英文摘要：

The contents of carbon and nitrogen and C ： N ratio stoichiometry in three warm temperate deciduous broadleaf forest types were investigated in Dongling Mountains, northern China. The results showed that： 1 ） The carbon concentrations of soil and tree layer decreased successively from Betula platyphylla （birch） forest （BF）, Quercus liaotungensis （oak） and Betula dahurica mixed deciduous broadleaf forest（MF）, to Quercus liaotungensis （oak） forest （OF）. The tree layer in the mixed forests had the highest nitrogen concentration, which was more than twice that of the others. However, no significant difference was found in the carbon and nitrogen contents in soil microbial among the three forest types. 2） The variation of C：N ratio in the soil microbial was smaller than that in the tree layer among the three forest types, regardless of the soil C and N concentrations. 3） The C ： N ratios of both the soil and the soil microbial were not significantly changed and appeared well-constrained in the three forest types.