鼎湖山3种演替阶段森林土壤C、N、P现状及动态

发布时间：2018-05-08 08:03

本文选题：土壤有机碳 + 氮　；参考：《热带亚热带植物学报》2017年06期

【摘要】：为探讨森林演替过程中土壤C、N、P的变化,通过测定鼎湖山3种演替阶段的森林土壤有机碳(SOC)、总氮(TN)、总磷(TP)含量,对他们的化学计量进行分析。结果表明,鼎湖山3种森林土壤SOC和TN随演替阶段而增加,演替中后期表层土壤(0~20 cm)与演替初期的差异达到显著水平(P0.05),在土壤剖面上的分布都呈现显著的表层富集现象,且表层土壤与其他土层均有显著差异(P0.05)。土壤TP含量随演替阶段没有呈现出有规律的变化,不同演替阶段间也没有显著差异,但不同演替阶段土壤TP在土壤剖面上的分布表现不同,演替前期土壤TP含量随着土层深度增加而增加,演替后期土壤TP随土层深度的增加而降低,而演替中期土壤TP含量在各土层间没有显著差异。土壤C∶N不受土层深度和演替进程的影响,而土壤C∶P和N∶P均表现为随演替阶段而增加,随土层加深而降低。这些揭示了森林土壤SOC、TN和TP含量随演替进展及其在土壤剖面上的分布取决于土壤C、N、P的来源方式。
[Abstract]:In order to study the changes of soil C ~ (1 +) N ~ (+) P during forest succession, the contents of soil organic carbon (SOC), total nitrogen (TNN), total phosphorus (TP) in three succession stages of Dinghushan were determined and their stoichiometry was analyzed. The results showed that the SOC and TN of the three forest soils in Dinghushan increased with the succession stage, and the difference between the topsoil (0 ~ 20 cm) and the early stage of the succession reached a significant level (P 0.05), and the distribution in the soil profile showed a significant surface enrichment phenomenon. There was significant difference between surface soil and other soil layers (P 0.05). Soil TP content did not change regularly with succession stage, and there was no significant difference between different succession stages, but the distribution of TP in soil profile was different in different succession stages. The TP content of soil increased with the increase of soil depth in the early stage of succession, and decreased with the increase of soil depth in the later stage of succession, but there was no significant difference in TP content among different soil layers in the middle period of succession. Soil C: n was not affected by soil depth and succession process, but soil C: P and N: P increased with succession stage and decreased with soil depth. These results reveal that the evolution of soil SOCN TN and TP contents and their distribution in soil profiles depend on the source mode of soil C ~ (2 +) N ~ (+ +) P.
【作者单位】：中国科学院华南植物园广东省应用植物学重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(31270557)资助~~
【分类号】：S714.2

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