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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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滇中高原云南松幼林和成熟林土壤呼吸及主要影响因子分析
DOI: 10.3969/j.issn.1000-2006.2014.03.014, PP. 71-76
Keywords: 云南松林,土壤呼吸,土壤温度,土壤含水量,土壤养分
Abstract:
为探明云南磨盘山国家森林公园云南松林幼林与成熟林土壤呼吸特征及其主要调控因子,采用li-6400-09土壤呼吸室测定土壤呼吸速率的季节动态。结果表明:云南松幼林和成熟林土壤co2流动速率呈明显的季节波动,且成熟林土壤呼吸(1.09～3.69μmol/(m2？s))显著高于幼龄林(0.88～3.08μmol/(m2？s))。土壤水分是影响土壤呼吸季节动态的重要影响因子,土壤含水量对土壤呼吸速率的影响显著大于土壤温度,不同影响因子中,含水量成熟林土壤呼吸的影响占全部影响的63.3%～76.0%,对幼林的49.3%～79.4%。ph与土壤养分对土壤呼吸也会产生一定影响。2种林分中,土壤呼吸速率与ph、全p均呈显著或极显著正相关,与土壤c/n极显著负相关;同时,土壤含水量与全n极显著正相关,与c/n显著或极显著负相关;但土壤含水量与土壤ph、全p仅在成熟林中呈显著或极显著正相关。因此,西南地区严重干旱导致土壤含水量的减少已成为土壤呼吸速率的主要限制因子,土壤水分能够通过影响土壤通透性、土壤有机质以及n、p等养分含量,从而调控云南松成熟林和幼林土壤呼吸的时空动态。
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