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凋落物作为土壤呼吸的重要碳源,其输入的数量和质量将对土壤呼吸产生重要影响。自2011年2月—2012年5月,在浙江天童森林生态系统设置对照、去除和加倍凋落物处理,研究不同凋落物处理对木荷(Schima superba)林土壤呼吸速率、土壤温度和土壤含水量的影响。结果表明:去除和加倍凋落物对土壤温度的影响不显著,对土壤含水量的影响显著,相比对照的土壤呼吸速率2.52±0.29μmol·m-2·s-1,去除凋落物使土壤呼吸速率显著降低了25.32%;而加倍凋落物处理与对照之间的土壤呼吸速率无显著差异。不同凋落物处理下土壤呼吸均表现出明显的季节变化,凋落物处理在湿季对土壤呼吸速率的影响接近显著(P=0.065),在干季不显著,并且湿季的土壤呼吸速率显著高于干季。不同凋落物处理的土壤呼吸速率与土壤温度均呈显著相关,土壤温度解释了土壤呼吸速率变异程度的80.1%~90.3%,Q10值分别为2.42、2.48和2.24;而土壤呼吸速率与土壤含水量之间的相关性不显著。研究结果表明,短期凋落物处理对土壤呼吸产生了影响,并且这种影响因季节差异而不同,证明了凋落物对于改变森林生态系统土壤呼吸和碳循环具有重要作用。
As an important carbon source for soil respiration, litterfalls will have a significant impact on soil respiration due to the quantity and quality of inputs. From February 2011 to May 2012, control, removal and doubling of litterfalls were carried out in the forest ecosystems of Tendo, Zhejiang Province. The effects of different litterfall treatments on soil respiration rate, soil temperature and soil moisture in Schima superba forest were studied. Impact. The results showed that removal and doubling of litter had no significant effect on soil temperature, and had significant effects on soil water content. Compared with the control, the soil respiration rate was 2.52 ± 0.29μmol · m-2 · s-1, litter removal led to soil respiration The rate of soil respiration decreased significantly by 25.32%. There was no significant difference in soil respiration rate between double litter and control. The soil respiration showed obvious seasonal changes under different litterfalls. The litterfall treatment had a significant effect on soil respiration rate in wet season (P = 0.065), but not in dry season, and the soil respiration rate in wet season was significantly higher In dry season. Soil respiration rate was significantly correlated with soil temperature under different litterfalls. Soil temperature explained 80.1% -90.3% of soil respiration rate variation and Q10 values were 2.42, 2.48 and 2.24, respectively. However, soil respiration rate and soil moisture content The correlation between them is not significant. The results showed that short-term litterfall treatment had an impact on soil respiration, and this effect differed from season to season, demonstrating that litter plays an important role in changing soil respiration and carbon cycle in forest ecosystems.