毛乌素沙地固沙林枯落物—土壤连续体生态化学计量特征
作者:
作者单位:

作者简介:

杨京(1998—),男,硕士研究生,主要从事系统碳循环研究。E-mail:1194705569@qq.com

通讯作者:

中图分类号:

S791.25

基金项目:

陕西省自然科学基金重点项目(2023-JC-ZD-10);陕西省农业专项资金项目;国家大学生创新创业训练计划项目(202210712158)


Stoichiometric Characteristics of the Litter-Soil Continuum in Sand Fixation Forest of the Mu Us Sandy Land
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    为揭示不同固沙林模式恢复过程中主要养分含量变化关系与差异特征。以榆林毛乌素沙区半固定沙地以及恢复25~56年的人工灌木和乔木林地为对象,测定和分析从枯落物层到腐殖质层,再到矿质土层碳(C)、氮(N)、磷(P)含量及其化学计量比随恢复年限和连续体剖面的动态变化特征及相关关系。结果表明:不同恢复年限2种林地C、N、P含量及其化学计量均表现为枯落物层>腐殖质层>矿质土层。但随林地恢复年限延长,2种林地枯落物、腐殖质及矿质土层C含量均显著增加,到恢复56年时,分别比半固定沙地平均增加1.76,35.70,6.45倍;P含量在腐殖质层和矿质土层中显著增加,平均增幅分别为1.67,2.11倍;N含量仅在矿质土层显著增加,平均增幅为4.16倍。2种林地化学计量变化则表现为,随恢复年限延长,腐殖质层C∶N呈显著增加趋势,到恢复56年时,比半固定沙地平均增长18.6倍;N∶P只在灌木连续体中显著增加,C∶P未显著变化。相关分析表明,2种林地连续体各层间C含量均达到极显著正相关,矿质土层C与N、P之间也呈极显著正相关,腐殖质层C∶N、C∶P与矿质土层C∶P均呈极显著正相关。综上,榆林毛乌素沙地植被恢复过程中,枯落物—土壤连续体C含量为协同增长,N、P含量仅在矿质土层中增长明显,C∶P是连续体中相对平衡稳定的化学计量特征。

    Abstract:

    To reveal the evolution of C, N, and P contents and ecological stoichiometric ratios along the litter-soil continuum during the restoration of sand-fixing forests, artificial shrub and arbor stands with 25-56 years restoration in the Mu Us sandy land of Yulin were taken as the study object, we measured and analyzed the dynamics of carbon (C), nitrogen (N), phosphorus (P) contents, and their stoichiometric ratios along the restoration years and continuum profiles in semi-fixed sandy sites, from the litter layer to the humus layer and then to the mineral soil layer. The results showed that the C, N, and P contents and their stoichiometry in the two types of woodland at different restoration years were all in the litter layer > humus layer > mineral soil layer. However, the C content of the litter, humus and mineral soil layers increased significantly with the extension of the restoration period, with an average increase of 1.76, 35.70, and 6.45 times compared with that of the semi-fixed sandy land at 56 years; the P content increased significantly in the humus and mineral soil layers, with an average increase of 1.67 and 2.11 times, respectively; the N content increased significantly only in the mineral soil layer, with an average increase of 4.16 times. The change in stoichiometry of the two woodlands showed a significant increase in C∶N in the humus layer with the increase of restoration years, with an average increase of 18.6 times compared with the semi-fixed sandy land at 56 years; N∶P increased significantly only in the shrub continuum; C∶P did not change significantly. Correlation analysis showed that the C content of all layers in the two woodland continuums reached a highly significant positive correlation, and the C of the mineral soil layer was also highly significantly positively correlated with N and P. The C∶N and C∶P of the humus layer were highly significantly positively correlated with the C∶P of the mineral soil layer. In conclusion, the C content of the litter-soil continuum increased synergistically during the vegetation restoration process in Yulin Mu Us sandy land, while the N and P contents increased significantly only in the mineral soil layer, and C∶P was a relatively balanced and stable stoichiometric feature in the continuum.

    参考文献
    相似文献
    引证文献
引用本文

杨京, 张延文, 李灿, 拓卫卫, 王逸聪, 董文煊, 佟小刚.毛乌素沙地固沙林枯落物—土壤连续体生态化学计量特征[J].水土保持学报,2023,37(3):345~352

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2022-09-30
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2023-05-23
  • 出版日期: