Characterizing soil water dynamics on steep hillslopes from long-term lysimeter data

Augenstein, Michael; Goeppert, Nadine; Goldscheider, Nico

doi:10.1016/j.jhydrol.2015.08.053

Cited by 10 publications

(14 citation statements)

References 28 publications

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“…Similarly, the strong link to soil skeleton was not surprising given that higher soil skeleton content is linked to lower soil water holding capacity (directly via a reduced volume of fine material and indirectly via its inverse relationship to soil depth) and that soil moisture is a prerequisite for the spread of oomycetes like P. cinnamomi (Hardham & Blackman, ). Similarly, the effect of slope is most likely attributable to lower soil moisture (Augenstein, Goeppert, & Goldscheider, ; Duque‐Lazo et al, ; van Schaik, ). Interestingly, we did not find a strong association between pH and oomycete communities as previously observed for different Phytophthora species (Jung et al, ) and plant‐associated protist diversity in general (Dupont, Griffiths, Bell, & Bass, ).…”

Section: Discussionmentioning

confidence: 99%

Site‐specific distribution of oak rhizosphere‐associated oomycetes revealed by cytochrome c oxidase subunit II metabarcoding

Sapp

Tyborski

Linstädter

et al. 2019

Ecology and Evolution

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The phylum Oomycota comprises important tree pathogens like Phytophthora quercina, involved in central European oak decline, and Phytophthora cinnamomi shown to affect holm oaks among many other hosts. Despite the importance to study the distribution, dispersal and niche partitioning of this phylum, metabarcoding surveys, and studies considering environmental factors that could explain oomycete community patterns are still rare. We investigated oomycetes in the rhizosphere of evergreen oaks in a Spanish oak woodland using metabarcoding based on Illumina sequencing of the taxonomic marker cytochrome c oxidase subunit II (cox2). We developed an approach amplifying a 333 bp long fragment using the forward primer Hud‐F (Mycologia, 2000) and a reverse primer found using DegePrime (Applied and Environmental Microbiology, 2014). Factors reflecting topo‐edaphic conditions and tree health were linked to oomycete community patterns. The majority of detected OTUs belonged to the Peronosporales. Most taxa were relatives of the Pythiaceae, but relatives of the Peronosporaceae and members of the Saprolegniales were also found. The most abundant OTUs were related to Globisporangium irregulare and P. cinnamomi, both displaying strong site‐specific patterns. Oomycete communities were strongly correlated with the environmental factors: altitude, crown foliation, slope and soil skeleton and soil nitrogen. Our findings illustrate the significance of small scale variation in habitat conditions for the distribution of oomycetes and highlight the importance to study oomycete communities in relation to such ecological patterns.

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Section: Discussionmentioning

confidence: 99%

Site‐specific distribution of oak rhizosphere‐associated oomycetes revealed by cytochrome c oxidase subunit II metabarcoding

Sapp

Tyborski

Linstädter

et al. 2019

Ecology and Evolution

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“…It is underlain by a drainage layer (DL) with a thickness of 15 cm followed by a mineral clay liner and capillary barrier. Further details on the construction of both fields is given in Augenstein et al (2015).…”

Section: Study Sitementioning

confidence: 99%

“…In the present study, we analyze long term soil moisture time series from a large inclined lysimeter located in southern Germany. Data from the monitoring of this test site has previously been evaluated and published concerning the proper function of the landfill cover (Zischak, 1997;Gerlach, 2007) and in regard to flow processes on steep hillslopes (Augenstein et al, 2015) using only much shorter parts of the time series available. However, a time series analysis of all available soil moisture measurements from this test site to gain insight into long term soil moisture variations has not been done previously and is the main focus of this study.…”

Section: Introductionmentioning

confidence: 99%

Deep desiccation of soils observed by long-term high-resolution measurements on a large inclined lysimeter

Merk¹,

Goeppert²,

Goldscheider³

2020

Preprint

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Abstract. Availability of long-term and high-resolution measurements of soil moisture is crucial when it comes to understanding all sorts of changes to past soil moisture variations and the prediction of future dynamics. This is particularly true in a world struggling against climate change and its impacts on ecology and economy. Feedback mechanisms between soil moisture dynamics and meteorological influences are key factors when it comes to understanding the occurrence of drought events. We used long-term high-resolution measurements of soil moisture on a large inclined lysimeter at a test site near Karlsruhe, Germany. The measurements indicate (i) a seasonal evaporation depth of over two meters. Statistical analysis and linear regressions indicate (ii) a significant decrease in soil moisture levels over the past two decades. This decrease is most pronounced at the start and the end of the vegetation period. Furthermore, Bayesian change point detection revealed (iii), that this decrease is not uniformly distributed over the complete observation period. Largest changes occur at tipping points during years of extreme drought, with significant changes to the subsequent soil moisture levels. This change affects not only the overall trend in soil moisture, but also the seasonal dynamics. A comparison to modeled data showed (iv) that the occurrence of deep desiccation is not merely dependent on the properties of the soil but is spatially heterogeneous. The study highlights the importance of soil moisture measurements for the understanding of soil moisture fluxes in the vadose zone.

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“…In addition, there are some models, including the Penman-Monteith model [10], the Shuttleworth-Wallace Model [11] and the clumping model [12], that can directly estimate field-scale ET. Among them, lysimeters [13,14] are normally used as a standard tool for and the minimum air temperature is −1.1 • C. Sandy loam soil accounts for more than 98% of the total arable land area of the region. Basic soil physical and chemical properties of the experimental site are listed in Table 1, which are also valid for the soils in the pot and lysimeter experiments.…”

Section: Introductionmentioning

confidence: 99%

A Simple Method for Estimating Field Crop Evapotranspiration from Pot Experiments

Chen

et al. 2018

Water

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Pot experiments are a low-cost and easy-to-use technique for studies of soil evaporation and plant transpiration in controlled environments. However, little attention has been paid to the applicability of evapotranspiration (ET) measured in pot experiments to the field. The objective of this study was to determine whether a pot experiment can be used for measuring field ET. Evapotranspiration experiments with winter wheat and summer maize were conducted in pots and lysimeters under various water-deficit conditions. The measured ET values in the pot experiments under different water conditions were considerably different from those of the lysimeters. Causes of such differences in ET were analyzed, and a series of corrections were proposed to eliminate the effects of different crop densities, representative areas per plant, and soil moisture conditions on pot experiment results. After these corrections, the discrepancy in the total ET of wheat-maize seasons between pots and lysimeters was greatly reduced from a maximum of 117% to only approximately 10%. The relative mean square errors (RMSEs) for daily ET values also decreased from a maximum value of 4.56 mm to less than 1.5 mm for the wheat season and from a maximum value of 6.02 mm to approximately 2 mm for the maize season. Possible measures were proposed to further improve the accuracy of the corrected ET obtained from pot experiments. In sum, pot experiments can serve as a feasible tool for estimating ET in the field just with a few routine measurements at regions where large-scale weighing lysimeters, an eddy covariance device, and even meteorological data are not available. The proposed corrections can also be used for upscaling small-scale ET measurements to a large scale.

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Characterizing soil water dynamics on steep hillslopes from long-term lysimeter data

Cited by 10 publications

References 28 publications

Site‐specific distribution of oak rhizosphere‐associated oomycetes revealed by cytochrome c oxidase subunit II metabarcoding

Site‐specific distribution of oak rhizosphere‐associated oomycetes revealed by cytochrome c oxidase subunit II metabarcoding

Deep desiccation of soils observed by long-term high-resolution measurements on a large inclined lysimeter

A Simple Method for Estimating Field Crop Evapotranspiration from Pot Experiments

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