Insights into the tussock growth form with model–data fusion
Insights into the tussock growth form with model–data fusion
复制标题
通过模型与数据融合洞察草丛生长形式
DOI：
10.1111/nph.18751
复制
发表时间：
2023
期刊：
影响因子：
9.4
通讯作者：
Rocha, Adrian V.
中科院分区：
文献类型：
--
作者：
Curasi, Salvatore R.;Fetcher, Ned;Wright, Kelseyann S.;Weldon, Daniel P.;Rocha, Adrian V.
一些根茎草和莎草物种形成影响生态系统结构和功能的草丛。尽管草丛的发育和大小控制很重要，但由于草丛形成的时间尺度为十年到百年，人们对草丛的发育和大小控制知之甚少。我们利用现场观察和质量平衡模型与分蘖种群模型相结合，探索了普遍存在的北极草莎草（Eriophorum vaginatum）草丛发育和大小的调节机制。模型-数据融合用于量化参数和预测不确定性，确定模型灵敏度，并测试有关调节草丛大小的因素的假设。该模型准确地捕捉了野外观察到的草丛发育动态、特征和大小。草丛生长在几十年内达到最大尺寸，这是由草丛根部坏死物的质量平衡和密度依赖性分蘖之间的反馈决定的。该模型还预测，最大草丛大小主要受分蘖根生产力和死灵体积密度的调节，而较少受分蘖人口统计的调节。这些预测得到了对草丛生物量和根系特征的现场观察的证实。该研究强调了地下过程在调节草丛发育和大小方面的重要性，并增强了我们对草丛对北极生态系统结构和功能影响的理解。
Some rhizomatous grass and sedge species form tussocks that impact ecosystem structure and function. Despite their importance, tussock development and size controls are poorly understood due to the decadal to centennial timescales over which tussocks form.We explored mechanisms regulating tussock development and size in a ubiquitous arctic tussock sedge (Eriophorum vaginatum) using field observations and a mass balance model coupled with a tiller population model. Model–data fusion was used to quantify parameter and prediction uncertainty, determine model sensitivity, and test hypotheses on the factors regulating tussock size.The model accurately captured the dynamics of tussock development, characteristics, and size observed in the field. Tussock growth approached maximal size within several decades, which was determined by feedbacks between the mass balance of tussock root necromass and density‐dependent tillering. The model also predicted that maximal tussock size was primarily regulated by tiller root productivity and necromass bulk density and less so by tiller demography. These predictions were corroborated by field observations of tussock biomass and root characteristics.The study highlights the importance of belowground processes in regulating tussock development and size and enhances our understanding of the influence of tussocks on arctic ecosystem structure and function.