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试验选取了四川雅安12~15年、20~22年、30~33年和>50年的茶园,研究其土壤团聚体有机碳、全氮、全磷的含量分布及其生态化学计量学特征,以阐明不同植茶年限土壤团聚体碳氮磷生态化学计量学特征的指示意义.结果表明:0~20 cm和20~40 cm土层土壤有机碳、全氮和全磷含量的变异系数分别为17.5%、16.3%、9.4%和24.0%、21.0%、9.2%;全磷的空间变异性低于有机碳和全氮,但三者呈极显著的正相关关系.有机碳与全氮含量集中分布于小粒径团聚体中,且均在植茶50年后达到最大值,土壤全磷在各粒径团聚体中分布则较为均匀,在种植年限上的变化也不大;0~20 cm和20~40 cm土层土壤C/N、C/P和N/P的变异系数分别为9.4%、14.0%、14.8%和7.4%、24.9%、21.8%;土壤C/N的变异性较低,土壤C/P和N/P均在小粒径中较高,且在植茶50年后达到最大值.土壤C/N、C/P和N/P对土壤有机碳储量具有良好的指示作用.
The tea plantations of 12-15 years, 20-22 years, 30-33 years and> 50 years in Ya’an, Sichuan were selected to study the content distribution of organic carbon, total nitrogen and total phosphorus in soil aggregates and their ecophysiological characteristics. The results indicated that the coefficients of variation of soil organic carbon, total nitrogen and total phosphorus in 0 ~ 20 cm and 20 ~ 40 cm soil layers were 17.5%, 16.3%, 9.4% and 24.0%, 21.0% and 9.2%, respectively. The spatial variability of total phosphorus was lower than that of organic carbon and total nitrogen, but there was a significant positive correlation between total phosphorus and total nitrogen Distributed in the small particle size aggregates, and reached the maximum after 50 years of tea planting. The distribution of soil total phosphorus in the aggregates of each particle size was more uniform and the change in planting years was not significant. 0-20 cm And C / N, C / P and N / P in the soil layer of 20-40 cm soil layer were 9.4%, 14.0%, 14.8% and 7.4%, 24.9% and 21.8%, respectively. Low, soil C / P and N / P were higher in the small size and reached the maximum after 50 years of tea planting.The soil C / N, C / P and N / P had good Indicate the role.