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应用生态学报 ›› 2019, Vol. 30 ›› Issue (3): 743-750.doi: 10.13287/j.1001-9332.201903.040

• 研究论文 • 上一篇    下一篇

沙地樟子松人工林叶片-枯落物-土壤氮磷化学计量特征

任悦1,2, 高广磊1,2*, 丁国栋1,2, 张英1, 郭米山1,2, 曹红雨1,2, 苏敏1,2   

  1. 1北京林业大学水土保持学院, 水土保持国家林业局重点实验室, 北京 100083;
    2宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 宁夏盐池 751500
  • 收稿日期:2018-06-19 出版日期:2019-03-20 发布日期:2019-03-20
  • 通讯作者: E-mail: gaoguanglei@bjfu.edu.cn
  • 作者简介:任 悦,女,1995年生,硕士研究生. 主要从事荒漠生态学研究. E-mail: renyue2017@bjfu.edu.cn
  • 基金资助:
    本文由国家重点研发计划项目(2018YFC0507101)、国家自然科学基金项目(31600583)和中央高校基本科研业务费专项资金项目(2017PT03,2015ZCQ-SB-02)资助

Stoichiometric characteristics of nitrogen and phosphorus in leaf-litter-soil system of Pinus sylvestris var. mongolica plantations.

REN Yue1,2, GAO Guang-lei1,2*, DING Guo-dong1,2, ZHANG Ying1, GUO Mi-shan1,2, CAO Hong-yu1,2, SU Min1,2   

  1. 1Key Laboratory of State Forestry Administration on Soil and Water Conservation, School of Soil and Water Conservation, Beijing Fore-stry University, Beijing 100083, China;
    2Yanchi Ecology Research Station of the Mu Us Desert, Yanchi 751500, Ningxia, China
  • Received:2018-06-19 Online:2019-03-20 Published:2019-03-20
  • Supported by:
    This work was supported by the National Key Research and Development of China (2018YFC0507101), the National Natural Science Foundation of China (31600583), and the Fundamental Research Fund for the Central Universities (2017PT03, 2015ZCQ-SB-02).

摘要: 为揭示沙地樟子松人工林N、P分配格局及化学计量特征,以呼伦贝尔沙地、科尔沁沙地、毛乌素沙地不同龄组(中龄林、近熟林和成熟林)沙地樟子松人工林为研究对象,测定分析其叶片、枯落物和土壤N、P含量及化学计量比.结果表明: 研究区3个龄组沙地樟子松人工林叶片、枯落物和土壤N、P含量分别为0.17~49.02和0.11~3.01 g·kg-1,N/P为0.51~19.74,均表现为叶片>枯落物>土壤,且N含量和N/P在3个组分间存在显著差异,叶片P含量显著高于枯落物和土壤.不同地区或林龄对沙地樟子松人工林各组分N、P含量及N/P有一定的影响,但地区和林龄的交互作用对沙地樟子松人工林各组分N/P无显著影响.随着林龄的增加,沙地樟子松各组分N、P含量也增加,在成熟林达到最大值,而N/P没有表现出明显的规律.沙地樟子松人工林N、P含量及N/P在3个组分间呈显著正相关关系.呼伦贝尔沙地和科尔沁沙地樟子松叶片N/P在14.53~15.57,说明这两个地区沙地樟子松人工林的生长可能受N、P的共同限制;毛乌素沙地樟子松叶片N/P在18.56~19.71,说明该地樟子松人工林生长可能受P限制,且林龄对沙地樟子松N、P养分限制的影响不显著.建议在沙地樟子松人工林抚育管理时,依据当地实际情况适当添加N肥或P肥,以提高沙地樟子松林的生产力.研究结果有助于进一步了解N、P在沙地樟子松人工林叶片-枯落物-土壤系统中的相互作用与制约规律,并为沙地樟子松人工林经营管理提供科学依据.

Abstract: To reveal the allocation pattern and stoichiometric characteristics of N and P in Pinus sylvestris var. mongolica plantation, we selected three P. sylvestris plantation with different stand ages (middle-aged, near-mature, mature) in the Hulunbuir, Horqin, and Mu Us sandy land as objects, and analyzed the contents of nitrogen, phosphorus and the N:P stoichiometry ratios in the leaf, litter, and soil. The results showed that the contents of N, P and N/P ratios in leaf, litter and soil varied in the range of 0.17-49.02, 0.11-3.01 g·kg-1 and 0.51-19.74, respectively, with the order of leaf>litter>soil. The content of N and N:P ratio were significantly different between leaf, litter and soil; the P content in leaf was significantly higher than that in litter and soil. The different areas and stand ages affected N, P content and N/P stoichiometry ratio, but the interaction of area and stand age had no significant effect on N/P stoichiometry ratio. The N, P contents in leaf, litter and soil increased with stand age, and were highest in the mature forest. The contents of N, P and N/P ratios were significantly positively correlated among the leaf, litter and soil. In the Hulunbuir and Horqin sandy land, the N/P ratros of leaf were between 14.53 to 15.57, which indicated that the P. sylvestris var. mongolica plantations was restricted by both N and P availability. In Mu Us sand land, the N:P ratios of leaf were between 18.56 to 19.71, which indicated P limitation. The stand age had no significant influence on soil N and P limitation. To improve the productivity of P. sylvestris var. mongolica plantations, we could appropriately add N or P fertilization in the plantation tending management based on local conditions. Our findings could contribute to a further understanding of the mechanism of interactions and constraints between N and P in the leaf-litter-soil system of P. sylvestris var. mongolica plantations, and provide a scientific guidance for the management.