植物生态学报 ›› 2022, Vol. 46 ›› Issue (1): 1-17.DOI: 10.17521/cjpe.2021.0283

• 研究论文 •    下一篇

土壤pH调控固氮植物和非固氮植物间的氮转移

王丽娜1, 于永强1, 芦东旭2, 唐亚坤1,2,*()   

  1. 1西北农林科技大学林学院, 陕西杨凌 712100
    2中国科学院水利部水土保持研究所, 陕西杨凌 712100
  • 收稿日期:2021-08-04 接受日期:2021-10-22 出版日期:2022-01-20 发布日期:2022-04-13
  • 通讯作者: 唐亚坤
  • 作者简介:*(yktang@nwsuaf.edu.cn)
  • 基金资助:
    国家自然科学基金(41977425);国家重点研发计划(2017YFA0604801)

Soil pH modulates nitrogen transfer from nitrogen-fixing plants to non-nitrogen-fixing plants

Li-Na WANG1, Yong-Qiang YU1, Dong-Xu LU2, Ya-Kun TANG1,2,*()   

  1. 1College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China
    2Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
  • Received:2021-08-04 Accepted:2021-10-22 Online:2022-01-20 Published:2022-04-13
  • Contact: Ya-Kun TANG
  • Supported by:
    the National Natural Science Foundation of China(41977425);the National Key R&D Program of China(2017YFA0604801)

摘要:

氮作为构成蛋白质的主要成分, 是植物生长的必要营养物质。陆地生态系统普遍存在土壤氮缺乏的现象, 混交种植模式中固氮植物可以将生物固定的氮转移给非固氮植物, 是满足非固氮植物氮需求的途径之一。明确固氮和非固氮植物间氮转移的影响因素有助于恢复退化生态系统, 构建稳定群落, 增加生态系统生产力。为了量化环境及生物等因素对氮转移的影响, 该研究采用文献调研法, 对118组氮转移比例(氮转移量占非固氮植物氮含量的比值, Ptransfer)文献和实验数据(包括21种固氮植物和23种非固氮植物)进行了线性混合模型分析。结果表明土壤pH是影响Ptransfer变化的最主要因素(解释量为44.04%), 其次为年平均温度(解释量为9.14%)以及固氮与非固氮植物生物量比值(解释量为2.95%), 而作为随机因素的固氮和非固氮植物物种差异的解释量为16.52%。此外, 碱性土壤中Ptransferr显著高于酸性土壤。在酸性土壤中, 年平均温度(解释量为12.49%)和土壤总氮含量(解释量为11.72%)是影响Ptransfer差异的主要因素, Ptransfer随着年平均温度和土壤总氮含量的增加而显著增加。而在碱性土壤中, Ptransfer差异主要受到固氮与非固氮植物生物量比值(解释量为13.29%)、年降水量(解释量为10.73%)和土壤总氮含量(解释量为9.33%)的调控。相对于酸性土壤, 碱性土壤能够显著增加固氮与非固氮植物生物量比值进而增加Ptransfer。同时, 在碱性土壤中Ptransfer与年降水量和土壤总氮含量呈显著正相关关系。这些结果对提高固氮和非固氮植物间的氮转移, 有效缓解土壤氮对非固氮植物生长的限制以及构建稳定群落具有重要意义。

关键词: 固氮植物, 氮转移, 土壤pH, 线性混合模型

Abstract:

Aims Nitrogen is the main component of protein and the essential nutrient for plant growth. Soil nitrogen deficiency is a common phenomenon in terrestrial ecosystems. Nitrogen-fixing plants can transfer biologically fixed nitrogen to non-nitrogen-fixing plants in mixed plantation community, which is one of the essential ways for non-nitrogen-fixing plants to obtain nitrogen. This nitrogen transfer is helpful to the restoration of degraded ecosystems, the construction of a stable community and the enhancement of ecosystem productivity. It is essential to identify the effects of environmental and biological factors on nitrogen transfer between nitrogen-fixing and non-nitrogen-fixing plants. Methods To realize this aim, we analyzed 118 pairs of data about nitrogen transfer proportion (ratio of nitrogen transfer to nitrogen content of non nitrogen-fixing plants, Ptransfer) using linear mixed model. These data were from experiments on 21 nitrogen-fixing plants and 23 non-nitrogen-fixing plants. Important findings The result showed that soil pH dominated the variation of Ptransfer (accounting for 44.04%), followed by mean annual temperature (accounting for 9.14%) and biomass ratio of nitrogen-fixing to non-nitrogen-fixing plants (accounting for 2.95%). As a random factor, the plant species difference accounted for 16.52% variation of Ptransfer. In addition, Ptransfer in alkaline soil was significantly higher than that in acidic soil. In acidic soil, the mean annual temperature (accounting for 12.49%) and soil total nitrogen content (accounting for 11.72%) were the main factors affecting Ptransfer. Ptransfer also increased significantly with the increase of mean annual temperature and soil total nitrogen content. In alkaline soil, the variation of Ptransfer was mainly influenced by the biomass ratio of nitrogen-fixing to non-nitrogen-fixing plants (accounting for 13.29%), mean annual precipitation (accounting for 10.73%) and soil total nitrogen content (accounting for 9.33%). The biomass ratio of nitrogen- fixing to non-nitrogen-fixing plants and Ptransfer were significantly higher in alkaline soil than in acidic soil. Meanwhile, significantly positive correlation was observed between Ptransfer in alkaline soil and mean annual precipitation and soil total nitrogen content. These results are meaningful to improve nitrogen transfer between nitrogen- fixing and non-nitrogen-fixing plants, to effectively alleviate the limitation of soil nitrogen on the growth of non-nitrogen-fixing plants and to build a stable plant community.

Key words: nitrogen-fixing plants, nitrogen transfer, soil pH, linear mixed model