洞庭湖湿地3个林龄杨树人工林叶与土壤碳氮磷生态化学计量特征
作者:
作者单位:

中南林业科技大学,南京林业大学,北京林业大学,中南林业科技大学,北京林业大学

作者简介:

通讯作者:

中图分类号:

基金项目:

湖南省教育厅项目(15C1425);中南林业科技大学青年基金项目(QJ2012018B);中南林业科技大学林学一级学科开放基金项目(2016YB13)


Characterization of the soil and leaf C, N, and P stoichiometry of poplar plantations of three different stand ages in Dongting Lake wetland, China
Author:
Affiliation:

Central South University of Forestry and Technology,Nanjing Forestry University,Beijing Forestry University,Central South University of Forestry and Technology,Beijing Forestry University

Fund Project:

其他

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

    选取洞庭湖洲滩湿地挖沟抬垄造林的6林龄、9林龄和13林龄杨树人工纯林为研究对象,通过比较不同林龄杨树叶及沟垄土壤的C、N、P含量差异,研究湿地杨树人工林不同生长阶段养分元素的分配格局及生态化学计量学特征,揭示杨树种植对洞庭湖湿地生态系统的影响。结果显示,叶N、叶P以及C∶P和N∶P与林龄显著相关,但叶C和C∶N与林龄不相关。3个林龄杨树人工林叶N∶P均大于16,说明P是限制洞庭湖杨树生长发育的主要因子,9林龄叶P量显著低于6林龄和13林龄,而N∶P和C∶P则显著高于6林龄和13林龄,说明P的限制在9林龄尤为显著。3个林龄湿地杨树人工林树垄和树沟土壤有机C、全N和C∶N呈现出与林龄和土层深度的负相关关系,但全P与两者没有显著关系。C∶P在树垄样地中呈现出与林龄和土层深度的负相关关系,而在树沟样地中呈现出与土层深度的正相关关系,与林龄无显著关系。N∶P在9林龄和13林龄树垄样地和6林龄树沟样地中与土层深度呈负相关关系,说明挖沟抬垄造林方式不利于土壤有机C和全N的积累,也不利于维持洞庭湖湿地土壤的肥力。

    Abstract:

    Ecological stoichiometry is a useful concept for studying the balance of multiple chemical elements in ecosystem interactions. In this study, we measured leaf and soil carbon (C), nitrogen (N), and phosphorus (P) levels in poplar plantation of three different stand ages (6-, 9-, and 13 year old), which were planted using the methods of digging furrows and lifting ridges, to explore the ecological stoichiometry characteristics and the distribution patterns of nutrient elements, and also to assess the ecological impacts of poplar plantations on Dongting Lake wetland ecosystem. The results showed that stand age had a significant effect on leaf N, P, C:P and N:P ratios, but not significantly correlated with leaf C and C:N ratio. For all three stand ages, the leaf N:P ratio was higher than 16, indicating that P is the main factor limiting the growth and development of poplar plantations in Dongting Lake wetland. The content of P in 9-year-old leaves was significantly lower than that in 6-year-old and 13-year-old leaves, whereas the ratios of C:P and N:P in 9 year-old leaves were significantly higher than those in 6-year-old and 13-year-old leaves, which showed that the limit of P had a particularly marked effect on 9 year-old poplar plantations. In both the ridge and furrow plots of the wetland poplar plantations, soil organic carbon (SOC), total N (TN) and C:N ratio were negatively correlated with stand age and depth of the soil layer. In contrast, total P (TP) was not significantly correlated with these two factors. The C:P ratio in the ridge plots was negatively correlated with stand age and soil depth, in the furrow plots, this ratio was positively correlated with the soil layers rather than stand age. For the N:P ratio, we detected a negative correlation with soil depth in the 9-year-old and 13-year-old ridge plots and in the 6-year-old furrow plots. These results illustrate that the ridge and furrow method used for planting poplars is detrimental to the accumulation of SOC and TN and to the maintenance of soil fertility in Dongting Lake wetland.

    参考文献
    相似文献
    引证文献
引用本文

靖磊,周延,吕偲,赵君茹,雷光春.洞庭湖湿地3个林龄杨树人工林叶与土壤碳氮磷生态化学计量特征.生态学报,2018,38(18):6530~6538

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: