Three Fundamental Challenges to the Advancement of Stemflow Research and Its Integration into Natural Science
Three Fundamental Challenges to the Advancement of Stemflow Research and Its Integration into Natural Science
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DOI：
10.3390/w16010117
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发表时间：
2023-12
期刊：
影响因子：
3.4
通讯作者：
J. V. Van Stan;Juan Pinos
中科院分区：
文献类型：
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作者：
J. V. Van Stan;Juan Pinos
植物冠层通过“茎流”将一部分降水转移到茎基部，这种现象影响冠层水分平衡、土壤微生物生态和系统内养分循环。然而，在自然科学的理论和数值模型的茎流的综合集成仍然有限。这种观点探讨了三个未解决的，阻碍这种整合的基本问题，从树冠到土壤。首先，在树冠内产生树干茎流的精确源区是不确定的。我问：“那是什麽？”目前常见的假设等同于整个树冠，一个潜在的误导性简化，可能会影响我们的解释茎流变异。其次，我们问，除了降雨、露水和拦截的冰融化之外，还有哪些条件有助于茎流的产生，排除这些体积是否会因此掩盖对茎流更广泛影响的理解？第三，我们探讨了“茎流向何处去？”这个问题超出了有多少树干茎流渗入哪里，进入什么吸收它，从哪里。解决这些问题受到当前观察和分析方法的限制。然而，面对这些挑战，茎流研究界站在理解这一独特的水文组成部分，并将其置于更广泛的自然科学背景下取得重大进展。
Plant canopies divert a portion of precipitation to the base of their stems through “stemflow”, a phenomenon that influences the canopy water balance, soil microbial ecology, and intrasystem nutrient cycling. However, a comprehensive integration of stemflow into theoretical and numerical models in natural science remains limited. This perspective examines three unresolved, fundamental questions hindering this integration, spanning the canopy to the soil. First, the precise source area within the canopy that generates stemflow is undefined. Thus, we asked, “whence stemflow?” Current common assumptions equate it to the entire tree canopy, a potentially misleading simplification that could affect our interpretation of stemflow variability. Second, we asked what are the various conditions contributing to stemflow generation—beyond rain, to dew and intercepted ice melt—and could the exclusion of these volumes consequently obscure an understanding of the broader implications of stemflow? Third, we explored ”whither stemflow?” This question extends beyond how much stemflow infiltrates where, into what uptakes it and from where. Addressing these questions is constrained by current observational and analytical methods. Nevertheless, by confronting these challenges, the stemflow research community stands to make significant strides in comprehending this unique hydrological component and situating it within the broader context of natural science.