欢迎访问《应用生态学报》官方网站,今天是 分享到:

应用生态学报 ›› 2019, Vol. 30 ›› Issue (5): 1615-1624.doi: 10.13287/j.1001-9332.201905.040

• • 上一篇    下一篇

长白山阔叶红松林和杨桦次生林土壤有机碳氮的协同积累特征

赵华晨, 高菲, 李斯雯, 高雷, 王明哲, 崔晓阳*   

  1. 东北林业大学林学院, 哈尔滨 150040
  • 收稿日期:2019-03-18 修回日期:2019-03-18 出版日期:2019-05-15 发布日期:2019-05-15
  • 通讯作者: E-mail: c_xiaoyang@ 126.com
  • 作者简介:赵华晨,男,1993年生,硕士研究生.主要从事森林土壤碳循环方面的研究.E-mail: 1042926688@qq.com
  • 基金资助:
    国家重点研发计划项目(2016YFA0600803)和国家自然科学基金重点项目(41330530)

Co-accumulation characters of soil organic carbon and nitrogen under broadleaved Korean pine and Betula platyphylla secondary forests in Changbai Mountain, China.

ZHAO Hua-chen, GAO Fei, LI Si-wen, GAO Lei, WANG Ming-zhe, CUI Xiao-yang*   

  1. College of Forestry, Northeast Forestry University, Harbin 150040, China
  • Received:2019-03-18 Revised:2019-03-18 Online:2019-05-15 Published:2019-05-15
  • Supported by:
    This work was supported by the National Key Research and Development Program of China ( 2016YFA0600803) and the Key Project of National Natural Science Foundation of China (41330530).

摘要: 次生演替是森林土壤有机碳、氮库变化的重要驱动因素.本研究以长白山原始阔叶红松林和杨桦次生林为例,通过成对样地途径,研究了森林土壤有机碳、氮的数量分布及其协同积累特征,探讨了次生演替导致的温带森林土壤碳库和碳汇效应变化及其碳氮耦合机制.结果表明: 杨桦次生林比原始阔叶红松林在土壤表层和亚表层(0~20 cm)积累了更多的有机碳和氮,其土壤C/N值也显著低于阔叶红松林;相对于阔叶红松林,杨桦次生林土壤(0~20 cm)有机碳储量平均增加了14.7 t·hm-2,相当于29.4 g·m-2·a-1的土壤碳汇增益.土壤有机碳和全氮在不同林型的不同土层中均表现为极显著正相关,二者具有明显的协同积累特征.与阔叶红松林生态系统相比,相对富氮的杨桦次生林生态系统的上部土层中氮对有机碳的决定系数明显高于阔叶红松林,说明杨桦次生林土壤有机碳的积累在更大程度上依赖含氮有机质积累.在有机质最丰富的表层(0~10 cm),两种林型间轻组有机碳、氮储量无显著差异,但杨桦次生林重组有机碳、氮的含量、储量及分配比例均显著高于阔叶红松林,其中,重组有机碳储量平均增加了8.5 t·hm-2,表明次生演替过程中土壤有机碳、氮库的增加主要在于矿物质结合态稳定性土壤有机碳、氮库的增容.凋落物分解和稳定性土壤有机质形成中的碳氮耦合机制是次生演替过程中土壤有机碳、氮库变化的重要驱动机制.

Abstract: The retrogressive succession is an important driver for dynamics of soil organic carbon (SOC) and total nitrogen (TN). We studied the quantitative distribution and synergistic accumulation characteristics of soil organic carbon and nitrogen in the primary broadleaved Korean pine (KP) forest and Betula platyphylla (BP) secondary forest in Changbai Mountain through paired plot approach. Further, we analyzed the changes of carbon pool and carbon sink effect in temperate forest soil caused by secondary succession and their carbon-nitrogen coupling mechanism. The results showed that the BP forest accumulated more organic carbon and nitrogen in the surface and subsurface soil (0-20 cm) than the KP forest, with relatively low soil C/N. Compared with KP forest, soil organic carbon storage in BP forest (0-20 cm) was higher by 14.7 t·hm-2, equivalent to a soil carbon sink gain of 29.4 g·m-2·a-1. SOC and TN concentrations were positively correlated in each soil layer of all forest types, causing a co-accumulative relationship between SOC and TN. The coefficient of determination (R2) between SOC and TN in the upper soil layers of BP forest was significantly higher than that of the KP forest, indicating that SOC accumulation under the relatively N-rich BP forest was more dependent on the accumulation of organic nitrogen. In the upper soil layers (0-10 cm) where organic matter concentrated, there was no significant difference in light fraction organic carbon and nitrogen stock between the two forest types, whereas the content, stock, and allocation percentage of heavy fraction organic carbon and nitrogen of BP forest were all significantly higher than that of the KP forest, with an average increment of 8.5 t·hm-2 in heavy fraction organic carbon stock. Those results indicated that the increase of soil organic carbon and nitrogen during secondary succession was mainly due to the increases of soil organic carbon and nitrogen pools in mineral-bound stability. The carbon-nitrogen coupling mechanisms in litter decomposition and soil organic matter formation was an important driving mechanisms underlying the changes of soil organic carbon and nitrogen pools during secondary succession.