大兴安岭5种类型低质林土壤呼吸日变化及影响因素-论文.pdf

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1、第42卷第9期东北林业大学学报Vo1．42No．92014年9月JOURNALOFNORTHEASTFORESTRYUNIVERSITYSep．2014大兴安岭5种类型低质林土壤呼吸日变化及影响因素)宋启亮董希斌(东北林业大学，哈尔滨，150040)摘要以大兴安岭地区针阔混交低质林、山杨低质林、蒙古栎低质林、白桦低质林、阔叶混交低质林为研究对象．采用LI一8150多通道土壤呼吸自动测量系统测定了不同类型低质林土壤呼吸速率的日变化，并测定了观测点的土壤温度、湿度、理化性质以及枯落物。结果表明：不同类型低质林土壤呼吸速率差异显著，土壤呼吸速率白天均高于夜晚．1d中最高值出现在12

2、：O0—14：O0，最低值出现在23：0o_-o3：00，土壤呼吸速率与土壤温度的关系适合指数模型(R为0．730．82)，土壤呼吸速率与土壤温度和土壤湿度呈显著的二次曲线关系(R为0．61—0．85)，土壤温湿度双因子复合模型能更好解释不同类型低质林土壤呼吸速率的差异。土壤呼吸速率与土壤总孔隙度、有机质质量分数存在显著的正相关性，与土壤pH值、氮质量分数及半分解枯落物蓄积量相关性也较高。关键词大兴安岭；低质林；土壤呼吸日变化；土壤温度；土壤湿度分类号$714DiurnalVariationandInfluencedFact0rsofSoilRespirationinFive

3、TypicalLow-qualityForestinDaxing’anMountains／SongQiliang，DongXibin(NortheastForestryUniversity，Harbin150040)／／JournalofNortheastForestryUni—versity．-2014．42(9)．-77～82WemeasuredthechangeofsoilrespirationratebyusingsoilrespirationmeasurementLI-8150，andthesoiltempera—ture．soilmoisture，soilphys

4、icalandchemicalproperties，litterinfivetypicallow．qualityforeststandsincludingmixedco-niferandbroadleavedforest，Populusdavidianaforest，Quercusmongolicaforest，BetulaplatyphyllaforestandbroadleavedmixedforestinDaxing’anMountains．Thesoilrespirationratesweresignificantlydifferentbetweendifferent

5、typesoflow—qualityforest．Thesoilrespirationratesduringthedaywerehigherthanthatinthenight，thehighestrateoccurredfroml2：00to14：00，andthelowestrateoccuredbetween23：00to3：00．Exponentialmodelwassuitabletotherelationbe—tweensoilrespirationrateandsoiltemperature(withRof0．73一O．82)．softrespirationra

6、teandsoilmoisturewasquadrat—iccurverelationship(withRof0．61—0．85)．soiltemperatureandmoisturecomplexdoublefactormodelcouldbetterex—plainthedifferencesofdifferenttypesoflow—qualityforestsoilrespirationrate．Thereweresignificantpositivecorelationsbetweensoilrespirationrateandsoiltotalporosity．o

7、rganicmattercontent，andtherewerehighercorelationsbetweensoilrespirationrateandsoilpH，nitrogencontent，andamountofsemi-decomposedlitter．KeywordsDaxing’anMountains；Low—qualityforest：Soilrespirationdiurnalvariation；Soiltemperature；Soilmoisture森林生态系统作为陆地生态系统中