Temporal changes in soil C-N-P stoichiometry over the past 60 years across subtropical China

Zaipeng Yu, Minhuang Wang, Zhiqun Huang, Teng Chiu Lin, Matthew A. Vadeboncoeur, Eric B. Searle, Han Y.H. Chen

研究成果: 雜誌貢獻文章

19 引文 斯高帕斯(Scopus)

摘要

Controlled experiments have shown that global changes decouple the biogeochemical cycles of carbon (C), nitrogen (N), and phosphorus (P), resulting in shifting stoichiometry that lies at the core of ecosystem functioning. However, the response of soil stoichiometry to global changes in natural ecosystems with different soil depths, vegetation types, and climate gradients remains poorly understood. Based on 2,736 observations along soil profiles of 0–150 cm depth from 1955 to 2016, we evaluated the temporal changes in soil C-N-P stoichiometry across subtropical China, where soils are P-impoverished, with diverse vegetation, soil, and parent material types and a wide range of climate gradients. We found a significant overall increase in soil total C concentration and a decrease in soil total P concentration, resulting in increasing soil C:P and N:P ratios during the past 60 years across all soil depths. Although average soil N concentration did not change, soil C:N increased in topsoil while decreasing in deeper soil. The temporal trends in soil C-N-P stoichiometry differed among vegetation, soil, parent material types, and spatial climate variations, with significantly increased C:P and N:P ratios for evergreen broadleaf forest and highly weathered Ultisols, and more pronounced temporal changes in soil C:N, N:P, and C:P ratios at low elevations. Our sensitivity analysis suggests that the temporal changes in soil stoichiometry resulted from elevated N deposition, rising atmospheric CO2 concentration and regional warming. Our findings revealed that the responses of soil C-N-P and stoichiometry to long-term global changes have occurred across the whole soil depth in subtropical China and the magnitudes of the changes in soil stoichiometry are dependent on vegetation types, soil types, and spatial climate variations.

原文英語
頁(從 - 到)1308-1320
頁數13
期刊Global Change Biology
24
發行號3
DOIs
出版狀態已發佈 - 2018 三月

    指紋

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Ecology
  • Environmental Science(all)

引用此

Yu, Z., Wang, M., Huang, Z., Lin, T. C., Vadeboncoeur, M. A., Searle, E. B., & Chen, H. Y. H. (2018). Temporal changes in soil C-N-P stoichiometry over the past 60 years across subtropical China. Global Change Biology, 24(3), 1308-1320. https://doi.org/10.1111/gcb.13939