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OALib Journal期刊
ISSN: 2333-9721
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改变碳源输入对蛟河红松阔叶混交林土壤呼吸的影响*
DOI: 10.3724/SP.J.1145.2015.04035, PP. 1-12
Keywords: 针阔混交林,凋落物,根系,土壤温度,土壤湿度,变化幅度,q10值
Abstract:
为了解改变碳源输入方式（对照处理，去凋处理，加倍凋落物处理，切根处理及去凋切根处理）对土壤呼吸速率及土壤温湿度的影响。于2014年5月至12月，吉林省蛟河红松阔叶混交林地表无雪期间，利用li-8100土壤co2通量全自动测量系统测定不同处理土壤呼吸速率及5cm处温、湿度。结果表明：不同处理之间5cm深度土壤温度的差异性不显著（p>0.05），不同处理间土壤湿度差异显著（p<0.05）。整个观测期间对照、去凋、加倍凋落物、切根和去凋切根处理的土壤呼吸速率平均值分别为3.35?molm-2s-1、3.54?molm-2s-1、4.22?molm-2s-1、2.11?molm-2s-1和2.45?molm-2s-1，不同处理土壤呼吸速率的变化幅度不相同。去除凋落物、加倍凋落物处理使土壤呼吸速率增加，整个观测期平均增加了1.98%和24.81%。切根、去凋切根处理使土壤呼吸速率降低，整个观测期平均降低了36.49%和28.64%。去凋处理，加倍凋落物处理，切根处理及去凋切根处理的q10值分别是3.32，3.35，3.38，2.59和3.13，切根处理显著低于其他处理。不同处理的土壤呼吸速率与土壤温度之间均呈显著指数相关（p<0.001），但与土壤湿度之间相关关系不显著（p>0.05）。土壤温度和土壤湿度的双变量复合模型能够更好的解释土壤呼吸的季节变化，决定系数r2值为62%~95%。结果证明改变碳源输入是影响森林co2通量的重要因子。图2表3参46
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