论文部分内容阅读
为了解长白山天然针阔混交林群落恢复演替土壤碳储量的变化,采用空间代替时间的方法,选取白桦幼龄林、白桦中龄林、白桦成熟林、阔叶红松成熟林和阔叶红松过熟林5个不同演替序列,研究其土壤总有机碳(SOC)、易氧化有机碳(ROC)、微生物生物量碳(MBC)及颗粒有机碳(POC)含量。结果表明:随着白桦林从早期到晚期的演替,SOC、MBC、ROC、POC以及土壤全氮、全磷和碳氮比(C/N)均呈现先逐渐增加后保持稳定的规律。随着土层深度的增加,SOC、MBC、ROC和POC含量均显著降低(P<0.05),5个演替序列内ROC/SOC和POC/SOC的变化范围分别为12.91%~47.95%和14.21%~69.46%。相关分析表明:MBC、ROC和POC含量与土壤总有机碳(SOC)含量呈极显著正相关(P<0.01),SOC、MBC、ROC和POC含量与全氮、全磷及碳氮比呈极显著正相关(P<0.01)。研究结果为了解白桦林在演替过程中土壤有机碳的稳定性变化和固碳潜力提供数据支持。
In order to understand the change of soil carbon storage in natural coniferous-broadleaved mixed forest communities in Changbai Mountain, the spatial substitution time was used to select the young Betula platyphylla, middle-aged Betula platyphylla, Betula platyphylla mature, Broad-leaved Korean pine mature and Broad- Five different succession sequences were used to study the contents of total organic carbon (SOC), soil organic carbon (ROC), MBC and POC. The results showed that the SOC, MBC, ROC, POC, total N, total P and C / N of the Betula platyphylla increased gradually and then kept stable with the succession from early to late stage. The contents of SOC, MBC, ROC and POC decreased significantly with the depth of soil (P <0.05). The ranges of ROC / SOC and POC / SOC varied from 12.91% to 47.95% and 14.21 % ~ 69.46%. Correlation analysis showed that the contents of MBC, ROC and POC were significantly and positively correlated with soil total organic carbon (SOC) content (P <0.01), and SOC, MBC, ROC and POC contents were positively correlated with total N, Significant positive correlation (P <0.01). The results provide data support for understanding the change of soil organic carbon stability and carbon sequestration potential in the succession process of Betula platyphylla forest.