Widespread woody plant use of water stored in bedrock

McCormick, Erica; Dralle, David; Hahm, W. Jesse; Tune, A. K.; Schmidt, Logan; Chadwick, Kristi; Rempe, D. M.

doi:10.1038/s41586-021-03761-3

Cited by 160 publications

(153 citation statements)

References 69 publications

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“…基岩风化层存在的情况下，阻碍了水分进一步向下渗透，将原本可能的浅层地下水位提高，促使基岩风化层上覆土壤水分再分配 [18,97] (图4a)；二是风化层本身可以贮存部分水，其中风化层间的垂直裂缝和水平缝隙(层状岩石)可能贮存大量的水，而岩石本身也会贮存少量的水 [4,77] (图 4b)；三是岩层中存在中小微型动物，它们的活动将原本存在的岩隙裂缝进一步扩大，使得上层水分以优先流的形式补给到地下水，部分水分在毛管力的作用下贮存于岩缝中(图4c)，最终达到水势平衡状态，贮存大量可用水 [38] ；四是在某些植物根部附着菌根菌丝，这部分微生物的存在有助于提高植物可利用有效水的范围，同时也为植物生长所需的营养元素提供了运输通道 [12,98] (图4d)；以上所述的四种潜在影响途径是一种或多种共同作用于整个风化层内，进而影响着整个地球关键带的生态水文过程 [4,[12][13][14] 。此外，本研究所述的潜在可能的影响途径仅是对目前研究成果的总结与假设，需在未来研究中进一步验证与完善。…”

Section: 潜在影响途径基岩风化层存在对生态水文过程的潜在可能影响途径可以归纳为四个方面(图4)。一是在unclassified

“…基岩风化层是一个独立而与土壤、植被、生物等外部成分密切联系的界面系统。目前对基岩风化层的研究主要集中在喀斯特关键带等土层浅薄的地区 [4,14,15] ，对黄土高原关键带、一般的丘陵沟谷地区及平原地带等相对土层较厚的区域关注较少 [99] ，且干旱地区基岩风化层中水分的补给循环及其状态对整个区域暖干化的如何响应，全球变暖和人类活动对生态系统的影响，能否从基岩风化层的水分盈亏变化上表现出来，也仍待进一步的研究与探讨。综上提炼该领域的研究现状可以发现，基岩风化层生态水文未来可能的研究热点及展望集中在六个方面(图3)。…”

Section: 可能的研究热点及展望unclassified

“…(1)基岩风化层中水分储量及其动态变化、出流特征 [4,14,38,40,44] 。基岩风化层内的水分储量在不同地形地貌岩性等可能有不同的含量，随季节干湿交替也可能表现出不同的变化特征，进而影响整个关键带的水分储量。特别是在干旱半干旱区，季节性降雨差异较大，对基岩风化层中水分储量有明显的扰动。此外，也需明确基岩风化层中存在裂缝或孔洞的数量、长度、宽度及分布特征，基岩风化层水分的时空变化特征、基本水力学性质，剖析基岩风化层水分垂直与侧向运动特征。…”

Section: 可能的研究热点及展望unclassified

“…基岩风化层储水量远大于土壤含水量，是干旱年份植物关键且稳定的水源，基岩风化层水储量在雨季积累到最大值后，额外的降水以径流或裂缝流形式成为基流 [3,14,16,17] 。尽管当前岩石水分研究主要集中在水分胁迫环境中植被吸水的潜在正效应，但在雨量充沛地区，岩石水分也对促进生物地球化学循环发挥关键作用 [18] 。因此，基岩风化层水分储量作为陆地水文循环的重要组成部分，逐渐被关注且考虑纳入新的水文和气候模型体系 [14,19,20] aquifer" OR "weathered rock aquifer" OR "weathered bedrock aquifer" OR "rock moisture" OR "rock hydrology" OR "rock ecohydrology" OR "rock hydrogeology" OR "bedrock moisture" OR "bedrock hydrology" OR "bedrock ecohydrology" OR "bedrock hydrogeology" OR "rock groundwater" OR "rock water resources" OR "rock water reserve" OR "rock water storage" OR "rock water holding capacity" OR "bedrock groundwater" OR "bedrock water resources" OR "bedrock water reserve" OR "bedrock water storage" OR "bedrock water holding capacity" OR "weathered bedrock water" OR "fractured bedrock water" OR "permeable rock" OR "permeable bedrock" OR "karst water" OR "karst hydrology" OR "karst aquifer" OR "epikarst water" OR "epikarst hydrology" OR "epikarst aquifer")为…”

mentioning

confidence: 99%

See 3 more Smart Citations

Progresses of weathered bedrock ecohydrology in the Earth’s critical zone

Luo¹,

Fan²,

Shao³

2022

Chin. Sci. Bull.

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Section: 潜在影响途径基岩风化层存在对生态水文过程的潜在可能影响途径可以归纳为四个方面(图4)。一是在unclassified

Section: 可能的研究热点及展望unclassified

mentioning

confidence: 99%

See 2 more Smart Citations

Progresses of weathered bedrock ecohydrology in the Earth’s critical zone

Luo¹,

Fan²,

Shao³

2022

Chin. Sci. Bull.

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“…McCormick et al (2021) underlined the importance of water stored in the weathered bedrock to fulfill the vegetation physiological needs during the growing season. Similarly,Pelletier et al (2016) stressed the beneficial effect of adding this intermediate layer in LSMs as a reservoir for plants during dry periods.…”

mentioning

confidence: 99%

Exploring the role of bedrock representation on plant transpiration response during dry periods at four forested sites in Europe

Jiménez-Rodríguez¹,

Sulis

Schymanski

2022

Preprint

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Abstract. Forest transpiration is controlled by the atmospheric water demand, potentially constrained by soil moisture availability, and regulated by plant physiological properties. During summer periods, soil moisture availability at sites with thin soils can be limited, forcing the plants to access moisture stored in the weathered bedrock. Land surface models (LSMs) have considerably evolved in the description of the physical processes related to vegetation water use but the effects of bedrock position and water uptake from fractured bedrock has not received much attention. In this study, the Community Land Model version 5.0 (CLM 5) is implemented at four forested sites with relatively shallow bedrock and located across an environmental gradient in Europe. Three different bedrock configurations (i.e., default, deeper, and fractured) are applied to evaluate if the omission of water uptake from weathered bedrock could explain some model deficiencies with respect to the simulation of seasonal transpiration patterns. Sap flow measurements are used to benchmark the response of these three bedrock configurations. It was found that the simulated transpiration response of the default model configuration is strongly limited by soil moisture availability at sites with extended dry seasons. Under these climate conditions, the implementation of an alternative (i.e., deeper and fractured) bedrock configuration resulted in a better agreement between modeled and measured transpiration. At the site with a continental climate, the default model configuration accurately reproduced the magnitude and temporal patterns of the measured transpiration. The implementation of the alternative bedrock configurations at this site provided more realistic water potentials in plant tissues but negatively affects the modeled transpiration during the summer period. Finally, all three bedrock configurations did not show differences in terms of water potentials, fluxes, and performances on the more northern and colder site exhibiting a transition between oceanic and continental climate. Model performances at this site are low, with a clear overestimation of transpiration compared to sap flow data. The results of this study call for increased efforts into better representing lithological controls on plant water uptake in LSMs.

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Deuterium depletion in xylem water and soil isotopic effects complicate the assessment of riparian tree water sources in the seasonal tropics

et al. 2021

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Riparian trees located in seasonally dry environments may be reliant on groundwater supplies, but the prevalence and magnitude of groundwater uptake is often unclear. Using soil water matric potential and water stable isotopes, we examined the relative contributions of soil water and groundwater to the dry season water uptake of five riparian tree species along an intermittent river of tropical northern Australia. Because xylem water was depleted in deuterium relative to source water (average offset −14.0‰), we numerically removed this offset and assessed the effect of the correction on mixing model results. We also estimated the isotopic composition of unbound soil water (i.e., the portion of soil water not tightly bound to soil particles) from bulk soil water data by using an empirical formulation from the literature and tested whether considering unbound soil water as a source would affect our results. Despite the hot and dry surface environment, we found that soil moisture was available for trees at relatively shallow (~0.7–1.5 m) depths. When unbound soil water and corrected xylem water data were considered, most tree species used a combination of this soil moisture source and groundwater from the capillary fringe. However, not correcting for isotopic effects resulted in large underestimations of the groundwater contributions to tree water uptake. Our findings suggest that ignoring soil isotopic effects and deuterium depletion in xylem water may reduce the validity of source water partitioning assessments. Further research is needed on the likely causes for deuterium depletion in xylem water.

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Widespread woody plant use of water stored in bedrock

Cited by 160 publications

References 69 publications

Progresses of weathered bedrock ecohydrology in the Earth’s critical zone

Progresses of weathered bedrock ecohydrology in the Earth’s critical zone

Exploring the role of bedrock representation on plant transpiration response during dry periods at four forested sites in Europe

Deuterium depletion in xylem water and soil isotopic effects complicate the assessment of riparian tree water sources in the seasonal tropics

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Widespread woody plant use of water stored in bedrock

Cited by 160 publications

References 69 publications

Progresses of weathered bedrock ecohydrology in the Earth&rsquo;s critical zone

Progresses of weathered bedrock ecohydrology in the Earth&rsquo;s critical zone

Exploring the role of bedrock representation on plant transpiration response during dry periods at four forested sites in Europe

Deuterium depletion in xylem water and soil isotopic effects complicate the assessment of riparian tree water sources in the seasonal tropics

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Product

Resources

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Progresses of weathered bedrock ecohydrology in the Earth’s critical zone

Progresses of weathered bedrock ecohydrology in the Earth’s critical zone