Quantifying the drivers of ecosystem fluxes and water potential across the soil-plant-atmosphere continuum in an arid woodland
Quantifying the drivers of ecosystem fluxes and water potential across the soil-plant-atmosphere continuum in an arid woodland
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量化干旱林地土壤-植物-大气连续体中生态系统通量和水势的驱动因素
DOI：
10.1016/j.agrformet.2022.109269
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发表时间：
2023
影响因子：
6.2
通讯作者：
Anderegg, William R.L.
中科院分区：
文献类型：
--
作者：
Kannenberg, Steven A.;Barnes, Mallory L.;Bowling, David R.;Driscoll, Avery W.;Guo, Jessica S.;Anderegg, William R.L.
旱地生态系统占据了陆地表面的大片区域，对全球碳和水的循环产生了相当大的影响。这些生物群落的特点是紧密耦合的碳和水循环，迅速响应瞬时脉冲水的可用性。然而，在植物和生态系统过程的环境驱动因素及其之间的联系方面存在许多机械上的不确定性。因此，旱地在许多植被和陆地表面模型中的代表性往往很差。由于缺乏对植物和生态系统过程的长期、同地和频繁的测量，对旱地生态系统功能的进一步了解受到限制。在美国犹他州东南部的一个松树-杜松林地，我们收集了一个连续的气象条件数据集，从地表到基岩的土壤水势，树木水势，生态系统的碳和水通量涡动协方差。我们发现，黎明前和中午的树水势和每日生态系统通量是高度敏感的土壤水分供应的波动，特别是在较浅的层，和白天的变化，大气驱动程序只松散地控制这些过程。浅层土壤水势，树水势，生态系统通量之间的强有力的连接发生，因为降水脉冲在驱动植被活动的主导作用，即使是小脉冲的水分刺激浅层土壤水势，树水势，蒸散1和2周之间。碳通量（净生态系统交换和总初级生产力）是敏感的降水脉冲更长的时间，长达3周。我们的研究结果强调，改善监测和浅层土壤水分传感可以大大提高我们对旱地生态系统功能的理解。还需要从机理上更好地了解降水脉冲的影响，以改进旱地生态系统的植被模型。
Dryland ecosystems occupy a vast swath of the terrestrial land surface and exert a sizeable impact on the cycling of carbon and water globally. These biomes are characterized by tightly coupled carbon and water cycles that respond rapidly to transient pulses in water availability. However, there exist many mechanistic uncertainties regarding the environmental drivers of, and linkages between, plant and ecosystem processes. Thus, drylands are often poorly represented in many vegetation and land surface models. An enhanced understanding of dryland ecosystem function is limited by the lack of long-term, co-located, and frequent measurements of plant and ecosystem processes. At a piñon-juniper woodland in southeastern Utah, USA, we collected a continuous dataset of meteorological conditions, soil water potential from surface to bedrock, tree water potential, and ecosystem carbon and water fluxes from eddy covariance. We found that predawn and midday tree water potential and daily ecosystem fluxes were highly sensitive to fluctuations in soil water availability, particularly in shallower layers, and that daytime variability in atmospheric drivers only loosely controlled these processes. The strong connections between shallow soil water potential, tree water potential, and ecosystem fluxes occurred because of the dominant role of precipitation pulses in driving vegetation activity, as even small pulses of moisture stimulated shallow soil water potential, tree water potential, and evapotranspiration for between 1 and 2 weeks. Carbon fluxes (net ecosystem exchange and gross primary productivity) were sensitive to precipitation pulses for longer, up to 3 weeks. Our results highlight that improved monitoring and sensing of shallow soil moisture can greatly enhance our understanding of dryland ecosystem function. A better mechanistic understanding of the impacts of precipitation pulses is also needed to improve vegetation modeling of dryland ecosystems.
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影响因子：
3.5
作者：
R. Vargas;Enrique Sánchez-Cañete P.;P. Serrano-Ortiz;J. Curiel Yuste;F. Domingo;A. López-Ballesteros;C. Oyonarte
通讯作者：
R. Vargas;Enrique Sánchez-Cañete P.;P. Serrano-Ortiz;J. Curiel Yuste;F. Domingo;A. López-Ballesteros;C. Oyonarte
DOI：
10.1111/nph.12392
发表时间：
2013-10
期刊：
The New phytologist
影响因子：
--
作者：
J. Plaut;W. Duncan Wadsworth;R. Pangle;Enrico A. Yepez;Nathan G. McDowell;W. Pockman
通讯作者：
J. Plaut;W. Duncan Wadsworth;R. Pangle;Enrico A. Yepez;Nathan G. McDowell;W. Pockman
影响因子：
9.8
作者：
Pastorello, Gilberto;Trotta, Carlo;Papale, Dario
通讯作者：
Papale, Dario
影响因子：
4.9
作者：
Schwinning，S.;Litvak，M. E.;McIntire，C. D.
通讯作者：
McIntire，C. D.
影响因子：
9.4
作者：
Guo, Jessica S.;Hultine, Kevin R.;Ogle, Kiona
通讯作者：
Ogle, Kiona