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A study on initial SOC accumulation and depth distribution
Authors
吕海波
梁宗锁
Publication date
1 January 2012
Publisher
Abstract
土壤有机碳(SOC)循环及周转规律是土壤碳汇研究的一个基本理论,然而当前对SOC的初始积累过程及其深度分异机制并不明确。以安塞纸坊沟刺槐林为实验地,对20、40、60 cm 3个深度,均匀添加枯落物碎屑的土壤培养坑分3、7和11月进行1年期的培养和观测。结果表明:20和40 cm深度7月SOC、活性有机碳(POC)及总氮(TN)值最高,11月各指标含量回落,可溶性有机碳(DOC)和可溶性有机氮(DON)呈相反变化趋势。培养过程中各指标出现深度分异:与20 cm不同,在60 cm深度,SOC随培养过程而递减,POC及全氮递增,而DOC在7月出现高值。各指标相关分析表明,随深度增加,SOC与DOC、DOC与全N相关程度增强。SOC在初始积累过程中先增后减,体现出自我调节机制的存在。DOC在浅层和深层表现出异源特点,培养坑60 cm深度SOC来源出现多元化,枯落物腐解产物影响程度减弱。</span
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018