植物生态学报 ›› 2018, Vol. 42 ›› Issue (7): 713-722.doi: 10.17521/cjpe.2018.0029

• 研究论文 • 上一篇    下一篇

地理来源与生物化学属性对泥炭地植物残体分解的影响

刘媛媛1,2,3,马进泽1,2,3,卜兆君1,2,3,*(),王升忠1,2,3,*(),张雪冰1,张婷玉1,刘莎莎1,2,3,付彪1,康媛1,2,3   

  1. 1 东北师范大学地理科学学院泥炭沼泽研究所, 长春 130024
    2 国家环境保护湿地生态与植被恢复重点实验室, 长春 130024
    3 长白山湿地生态过程与环境变化吉林省重点实验室, 长春 130024
  • 出版日期:2018-07-20 发布日期:2018-11-03
  • 通讯作者: 卜兆君,王升忠 E-mail:buzhaojun@nenu.edu.cn;szwang@nenu.edu.cn
  • 基金资助:
    国家自然科学基金(41371103);国家自然科学基金(41471043);国家自然科学基金(41601085);国家重点研发计划(2016YFC0500407)

Effect of geographical sources and biochemical traits on plant litter decomposition in a peatland

LIU Yuan-Yuan1,2,3, MA Jin-Ze1,2,3, BU Zhao-Jun1,2,3,*(), WANG Sheng-Zhong1,2,3,*(), ZHANG Xue-Bing1, ZHANG Ting-Yu1, LIU Sha-Sha1,2,3, FU Biao1, KANG Yuan1,2,3   

  1. 1 Institute for Peat and Mire Research, School of Geographical Science, Northeast Normal University, Changchun 130024, China
    2 Key Laboratory for Wetland Conservation and Vegetation Restoration, Ministry of Environmental Protection, Changchun 130024, China
    3 Jilin Provincial Key Laboratory for Wetland Ecological Processes and Environmental Change in the Changbai Mountains, Changchun 130024, China
  • Online:2018-07-20 Published:2018-11-03
  • Contact: Zhao-Jun BU,Sheng-Zhong WANG E-mail:buzhaojun@nenu.edu.cn;szwang@nenu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(41371103);Supported by the National Natural Science Foundation of China(41471043);Supported by the National Natural Science Foundation of China(41601085);the National Key Research and Development Program of China(2016YFC0500407)

摘要:

不同地理来源的泥炭地植物残体在同一环境中的分解速率一直缺乏比较研究。该研究沿纬度梯度, 选择大九湖、哈泥和满归3处泥炭地, 以三地的10种植物为分解材料, 使用分解袋包装, 埋藏于长白山哈泥泥炭地, 开展为期1年的分解实验, 研究地理来源及生物化学属性对泥炭地植物残体分解的影响。结果表明, 如不考虑物种差异, 从总体上看, 随着纬度增加, 3处泥炭地植物残体的初始氮(N)含量下降, 初始木质素含量、碳氮比(C/N)和木质素/N上升。经一年分解后残体分解速率因植物类群不同而不同, 桦木属(Betula)和薹草属(Carex)植物残体的干质量损失率均接近50%, 远大于泥炭藓属(Sphagnum)植物(约为10%)。3处来源地植物残体干质量损失率总体上无差异, 但比较同种植物残体发现, 来自中纬度泥炭地哈泥的中位泥炭藓(S. magellanicum)的干质量损失率(19%)远高于来自高纬度泥炭地满归的(9%)。制约残体分解的因素因植物类群不同而不同, 残体初始总酚/N是决定属间残体干质量损失率差异的重要指标。薹草属植物初始N含量和C/N与残体分解速率、泥炭藓属植物初始Klason木质素含量和总酚/N与残体分解速率均呈正相关关系。该研究一定程度上表明, 若以纬度降低指代气候变暖, 当前持续的气候变暖可能通过改变高纬度泥炭地的植物组成和植物的生物化学属性, 来改变植物残体分解速率, 进而影响泥炭地的碳汇功能。

关键词: 纬度梯度格局, 植物功能群, 泥炭地, 生物化学品质

Abstract:
Aims Few comparative studies have been conducted on the decomposition of the plant litters from different geographical sources in the same site. We aimed to understand the effect of geographical sources and biochemical traits of peatland plants on litter decomposition.
Methods Along a latitudinal gradient, we collected plant materials from three peatlands, Dajiuhu, Hani and Mangui, to carry out a one-year decomposition experiment with litter bags in Hani Peatland, Changbai Mountains.
Important findings When species identity was not considered, we found that overall initial nitrogen (N) content decreased while initial lignin content, carbon nitrogen ratio (C/N) and lignin/N increased with latitude in the litters from 3 peatlands. Litter decomposition differed with plant functional groups. After one year of decomposition, dry mass loss of both birch and sedge (ca. 50%) was higher than that of peat mosses (ca. 10%). No significant difference was observed in litter dry mass loss among different geographical sources. However, dry mass loss of Sphagnum magellanicum from the middle latitudinal peatland (19%) was higher than that from the high latitudinal site (9%). The factors affecting litter decomposition differed among plant functional groups. Initial total phenolics/N was the important factor to determine the difference in litter dry mass loss among the 3 genera. The initial N content and C/N, and Klason lignin content and total phenolics/N were positively related to litter decomposition of Carex and Sphagnum, respectively. If the decrease in latitude is used to indicate climate warming, to some extent, our study suggests that current climate warming, by changing the plant composition and biochemical traits, may alter litter decomposition and even carbon accumulation in high latitudinal peatlands.

Key words: latitudinal gradient pattern, plant functional group, peatland, biochemical quality