长白山阔叶红松林表层矿质土壤不同组分中有机碳及氮库特征研究  

Organic C and N in Various Surface Mineral Soil Fractions in the Broadleaved Korean Pine Mixed Forests in Changbai Mt.

作　　者：汲常萍[1] 王慧梅[1] 王文杰[1] 韩士杰[2] 

机构地区：[1]东北林业大学森林植物生态学教育部重点实验室,哈尔滨150040 [2]中国科学院沈阳应用生态研究所,沈阳110016

出　　处：《植物研究》2014年第3期372-379,共8页Bulletin of Botanical Research

基　　金：国家自然科学基金(31170575;41373075);"973"专题(2011CB403205)

摘　　要：以长白山天然阔叶红松林为研究对象，采用物理化学分级方法将其土壤分成5个具有不同稳定性特征的组分：沙和团聚体组分（sA）、酸不溶组分（AI）、易氧化组分（EO）、颗粒态组分（P）和可溶性组分（S）。分析各组分的质量分数、有机碳及氮浓度、C／N及其有机碳、氮的分配比例，旨在探讨阔叶红松林的碳截获和肥力供应潜力机制。研究结果显示：稳定土壤组分（AI和sA）的C／N比活跃土壤组分（P和EO）大2—8倍，显示了土壤组分对于土壤微生物分解的不同稳定性特征；接近90％的土壤质量集中在稳定（AI和sA）土壤组分上，导致土壤组分中有机碳的分配比例最大者为AI（42．7％）和SA（29．5％）；活跃土壤组分（P、EO和S）中的有机碳比稳定性组分（AI和sA）高出2—6倍，而氮浓度则高出4—37倍，这使得氮库由活跃组分EO（33．6％）、P（19．7％）和稳定组分AI（21．1％）、Sa（24．3％）构成。本研究揭示长白山阔叶红松林土壤有机碳主要截获于稳定性组分，而氮则在活跃组分与稳定组分中分配相当，这种土壤组分特征利于碳的长期累积和肥力（N）持续快速供应。In object, 5 soil fraction （EO） were separated this paper, taking the natural broadleaved Korean pine mixed forest in Changbai Mt. as research fractions of sand and stable aggregates （ SA）, acid insoluble fraction （ AI）, easily oxidized , particulate fraction （P） and soluble soil fraction （S） with different physic-chemical stabilities by a physic-chemical method. Weight percentages, organic C and N concentrations, C/N and allocation proportions of organic C and N in the various fractions were analyzed to explore the mechanism of potential of soil C sequestration and N supply. The results showed that the C/N of stable soil fractions （AI and SA） was 2- 8 times higher than that in labile fractions （P and EO）, which resulted in the different physic- chemical stability characteristics of soil fractions to soil microbial decomposition. About 90% of the soil quantity occluded on stable fractions （SA and AI）, which leaded to the higher organic C in the AI （42.7%） and SA （29.5 % ） fractions. The organic C concentrations in labile soil fractions （ P and EO） were 2 - 6 times higher than those in stable soil fractions （AI and SA）, whereas in term of N, this difference was enlarged to 4 -37 times. N was distributed similarly in labile fractions （EO,33.6% and P, 19.7% ） and stable fractions （AI, 21.1% and SA ,24.3% ）. The results reveal the characteristic of the carbon sequestration is mainly intercepted on the stable components, while N is allocated fairly in the labile fractions and stable fractions in the broad- leaved Korean pine mixed forests in Changbai Mt. area. The characteristic of soil fractions is good for the long- term accumulation of soil carbon, and sustainable and fast supply of soil fertility of N.

关 键 词：碳组分 氮组分 碳氮比 分配比例 

分 类 号：S791.247[农业科学—林木遗传育种]