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以安徽省滁州市红琊山林场麻栎人工林为研究对象,测定了4种施肥处理(0、0.15、0.30和0.45kg·株-1)林分碳密度,并采用开沟隔离法对不同处理林分休眠期土壤呼吸组分进行测定。结果表明:4种施肥处理林分总碳密度分别为73.68、84.49、87.20和91.70t·hm-2。与对照相比,各施肥处理麻栎树干碳密度、树枝碳密度和枯落物碳密度均有极显著提高(P<0.01)。不同处理林分的土壤总呼吸速率和异养呼吸速率随着施肥量增加呈递增趋势,施肥量为0.45kg·株-1样地土壤总呼吸速率和异养呼吸速率较对照样地分别增加了48.9%和38.6%。不同施肥样地土壤异养呼吸对土壤总呼吸的贡献率远大于根系呼吸,施肥量为0、0.15、0.30和0.45kg·株-1时分别是根系呼吸的5.0、3.8、3.4和3.2倍。土壤呼吸受生物因子和非生物因子共同调控,在所选取的4个指标中(土壤含水量、土壤C/N、根生物量和枯落物有机碳含量),土壤含水量和枯落物有机碳含量与土壤总呼吸及土壤异养呼吸速率均有显著相关性(P<0.05)。
Taking the Quercus acutissima plantations in Hongyashan Forest Farm of Chuzhou City in Anhui Province as the research object, the carbon density of four kinds of fertilization treatments (0, 0.15, 0.30 and 0.45kg · plant -1) was measured and the effects of different The soil respiration components during stand dormancy were measured. The results showed that the total carbon densities of the four kinds of fertilization treatments were 73.68, 84.49, 87.20 and 91.70 t · hm-2, respectively. Compared with the control, the carbon density, the dendrite carbon density and the litter carbon density of all treatments increased significantly (P <0.01). The total respiration rate and heterotrophic respiration rate of different treatments increased with the increase of fertilization rate. Soil total respiration rate and heterotrophic respiration rate increased by 0.45 kg · plant -1 compared with the control 48.9% and 38.6%. The contribution of soil heterotrophic respiration to soil total respiration in different fertilization plots was much larger than that of root respiration. The rates of 0, 0.15, 0.30 and 0.45 kg · plant -1 were 5.0, 3.8, 3.4 and 3.2 times of respiration of root respiration, respectively. Soil respiration was regulated by biotic and abiotic factors. Among the four selected indicators (soil moisture content, soil C / N, root biomass and litter organic carbon content), soil moisture and litter organic There was a significant correlation between carbon content and total soil respiration and soil heterotrophic respiration rate (P <0.05).