Key Laboratory for Subtropical Mountain Ecology, Ministry of Science and Technology and Fujian Province Funded, School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China.
Department of Ecology, Evolution & Behavior, University of Minnesota, St. Paul, MN, 55108, USA.
Ecol Lett. 2019 Feb;22(2):322-331. doi: 10.1111/ele.13193. Epub 2018 Nov 28.
Theoretical predictions regarding fine root production are needed in many ecosystem models but are lacking. Here, we expand the classic pipe model to fine roots and predict isometric scaling relationships between leaf and fine root biomass and among all major biomass production components of individual trees. We also predict that fine root production scales more slowly against increases in leaf production across global forest ecosystems at the stand level. Using meta-analysis, we show fine root biomass scales isometrically against leaf biomass both at the individual tree and stand level. However, despite isometric scaling between stem and coarse root production, fine root production scales against leaf production with a slope of about 0.8 at the stand level, which probably results from more rapid increase of turnover rate in leaves than in fine roots. These analyses help to improve our understandings of allometric theory and controls of belowground C processes.
理论上预测细根的产生在许多生态系统模型中是必要的，但目前还缺乏这方面的预测。在这里，我们将经典的管道模型扩展到细根，并预测叶和细根生物量之间以及个体树木所有主要生物量产生成分之间的等比缩放关系。我们还预测，在林分水平上，细根的产生相对于叶的产生增加的速度较慢，这在全球森林生态系统中是普遍存在的。通过荟萃分析，我们发现细根生物量在个体树木和林分水平上与叶生物量呈等比关系。然而，尽管茎和粗根的产生存在等比关系，但细根的产生相对于叶的产生呈大约 0.8 的斜率，这可能是由于叶片的周转率比细根的周转率增加得更快。这些分析有助于我们更好地理解植物生长的生物量分配理论以及地下碳过程的控制。
