Predicted risks of groundwater decline in seasonal wetland plant communities depend on basin morphology

Deane, David C.; Harding, Claire; Aldridge, Kane; Goodman, Abigail M.; Gehrig, Susan; Nicol, Jason; Brookes, Justin D.

doi:10.1007/s11273-017-9578-3

Cited by 7 publications

(6 citation statements)

References 29 publications

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“…The rapid introduction to E. globulus to the region targeted areas with shallow water tables, raising concerns around the impact deep‐rooted plants might have on unique and finite karstic groundwater resources surrounding native vegetation and groundwater dependent ecosystems (Benyon et al, 2006; Brookes et al, 2017; Deane et al, 2018). During the 2000s, wetlands began to contract and groundwater cones of depression were detected under some plantations, directly attributable to plantation groundwater extraction (Gibbs, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…There is a requirement to improve current tools/models to accurately quantify commercial plantation groundwater volumes used, groundwater resource impacts, and impact to ecosystems such as groundwater dependent ecosystems which rely on groundwater access (Brookes et al, 2017; Deane et al, 2018). Currently, the estimation of plantation groundwater extraction is undertaken using a forest water accounting model (Harvey, 2017; Wood, 2017) where the model determines groundwater recharge and extraction, incorporating static plantation biophysical outcomes from Benyon and Doody (2004) in relation to plantation evapotranspiration (ET) and groundwater extraction rates.…”

Section: Introductionmentioning

confidence: 99%

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Fine scale 20‐year timeseries of plantation forest evapotranspiration for the lower limestone coast

Doody

Benyon

Gao

2023

Hydrological Processes

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Commercial plantation forestry is a vital industry worldwide, providing natural resources for humans and playing an important role in carbon sequestration. Historically, impacts of plantation development to natural resources such as surface and groundwater was not considered, however demand for water and drying climates has focussed attention on sustainable water use and extraction. The Lower Limestone Coast region of south-east South Australia has an extensive softwood plantation estate. The region is characterised by minimal surface water and substantial, fresh karstic groundwater resources, often <6 m below ground. Rapid expansion over shallow groundwater of the plantation hardwood estate from 2000, prompted concern about impacts of deep-rooted plantations on water resources and notably contracting wetlands. To quantify plantation estate water use, an extensive evapotranspiration (ET) field study (1999-2008) identified plantation areas with <6 m to groundwater as groundwater users, leading to water policy whereby plantations are considered licenced water users. To enable plantation expansion in the region, fine resolution, broadscale ET data is required to ensure optimum use of water licences in the forest industry and account for plantation groundwater extraction. As continual field studies are not feasible, this 20-year, monthly 30 m ET dataset for the region was developed to improve estimates of plantation water use, enabling improved, dynamic estimates of groundwater extraction. The dataset was developed using 21 long-term field sites where ET was derived based on field measured transpiration, soil moisture, canopy interaction and rainfall data. Region specific field ET was combined with machine learning and additional remote sensing layers to estimate monthly ET (R 2 = 0.86) across the plantation estate, improving on a national remote sensing ET product. Currently, groundwater extraction is accounted for via modelling which excludes dynamic changes in plantation groundwater extraction, limiting understanding of the hydrological processes influencing available water resources and potentially impeding economic growth. | INTRODUCTIONGlobally, the commercial plantation forest industry provides vital wood fibre and products and substantial economic and social benefits to people. This is especially the case in regional areas with ideal growing conditions, water resource availability and fewer alternative economic options. The Lower Limestone Coast Prescribes Wells Area (LLC PWA) in the south-east of South Australia has supported significant commercial plantation forestry over the past 120 years across 10% (145 000 hectares) of its area, dominated by the softwood

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fine scale 20‐year timeseries of plantation forest evapotranspiration for the lower limestone coast

Doody

Benyon

Gao

2023

Hydrological Processes

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“…In Poland, one of the larger peatland concentrations is the macroregion of the Mazurian Lake District situated in north-eastern Poland. Peatlands, due to the functions they serve in the habitat, including water circulation and accumulation [9,10], effects on element circulation [11,12], water purification [13], protection of biodiversity [14], and effects on the climate [15], are covered by full protection [5,16].…”

Section: Introductionmentioning

confidence: 99%

“…Research into the biophysiochemical processes occurring in peatlands, in terms of their economic use and environmental impact, is becoming crucial [4,[17][18][19]. Not only are peatlands natural water retention reservoirs in the environment [9,10], but, due to the hydrobioaccumulation processes that occur in them, they also accumulate organic matter [20], which is rich in plant nutrients, particularly nitrogen [11,12]. The organic matter contained in peats exhibits filtration and sorption properties [21].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Organic Nitrogen Compound Mineralization in Organic Soils under Grassland, and the Mineral N Concentration in Groundwater (A Case Study of the Mazurian Lake District, Poland)

Pawluczuk

Stępień

2023

Sustainability

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Peatlands serve numerous functions, with one of the main ones being the retention of nutrients, including mineral nitrogen. A field study in organic soils was carried out in the Mazurian Lake District situated in north-eastern Poland (53°37′50′ N, 20°28′51′ E). In the test peat soils, the rate of organic nitrogen compound mineralization varied significantly depending on the season. The dynamics of the organic matter mineralization process were most strongly influenced by the soil use and the season. The mineral N release was higher in organic soil under intensively used grassland. In this soil, much more mineral nitrogen was released during the summer and spring periods. The dominant form in the organic nitrogen compound mineralization processes was N-NO3. The highest dynamics of the organic nitrogen compound mineralization were noted at a soil moisture content ranging from 57% to 59%. The interdependence of the soil moisture content and the rate of organic nitrogen compound mineralization fluctuated over the study period, with an increase in spring and a decrease in summer. A correlation was demonstrated between the nitrate form content in the peat soils under intensive cultivation and the nitrate-nitrogen concentration in groundwater, while no correlation was demonstrated between the N-NO3 content in the soils under a forest and the N-NO3 concentration in the groundwater of these soils. The results provide the basis for the conclusion that the land use type (forest, grassland), which determines the morphological structure of organic soils, affects the intensity of the infiltration of different mineral nitrogen forms.

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“…Groundwater level is crucial for wetland development and maintenance, as it affects community assembly and composition (Deane et al, ; Hose, Bailey, Stumpp, & Fryirs, ; Valdez, Hartig, Fennel, & Poschlod, ) as well as the stability of plant communities (Ridolfi, D'Odorico, & Laio, ; Runhaar, Witte, & Verburg, ). Groundwater level is also a key factor determining plant growth and reproductive parameters (Booth & Loheide, ; Steed, Dewald, & Kolb, ) as the depth of the groundwater table strongly controls water, oxygen, and nutrient availability for plants (Kotowski, Andel, Diggelen, & Hogendorf, ; Muneepeerakul, Miralles‐Wilhelm, Tamea, Rinaldo, & Rodriguez‐Iturbe, ; Paul et al, ; Xu, Zhang, Tan, Li, & Wang, ).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variability of groundwater level effects on the growth of Carex cinerascens in lake wetlands

Feng

Mariotte

et al. 2019

Ecology and Evolution

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Groundwater level is crucial for wetland plant growth and reproduction, but the extent of its effect on plant growth can vary along with changed precipitation and temperature at different seasons. In this context, we investigated the effect of two groundwater levels (10 cm vs. 20 cm depth) on growth and reproductive parameters of Carex cinerascens, a dominant plant species in the Poyang Lake wetland, during three seasons (spring, summer, and autumn) and during two consecutive years (2015 and 2016). Carex cinerascens showed low stem number, height, and individual and population biomass in summer compared to spring and autumn. 10 cm groundwater level was overall more suitable for plant growth resulting in higher stem height and biomass. However, the interactive effect between groundwater level and season clearly demonstrated that the effect of groundwater level on plant growth occurred mainly in autumn. After the withering of the plant population in summer, we observed that C. cinerascens growth recovered in autumn to similar values observed in spring only with 10 cm groundwater level. Consequently, we could deduce that lowering groundwater level in the studied Poyang Lake wetland will negatively impact C. cinerascens regeneration and growth particularly during the second growth cycle occurring in autumn. Additionally, our results showed that, independently of the season and groundwater level, population biomass of C. cinerascens was lower during drier year. Altogether, our findings suggest that water limitation due to both reduction in precipitation and decreased groundwater level during the year can strongly impact plant communities.

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Predicted risks of groundwater decline in seasonal wetland plant communities depend on basin morphology

Cited by 7 publications

References 29 publications

Fine scale 20‐year timeseries of plantation forest evapotranspiration for the lower limestone coast

Fine scale 20‐year timeseries of plantation forest evapotranspiration for the lower limestone coast

Dynamics of Organic Nitrogen Compound Mineralization in Organic Soils under Grassland, and the Mineral N Concentration in Groundwater (A Case Study of the Mazurian Lake District, Poland)

Seasonal variability of groundwater level effects on the growth of Carex cinerascens in lake wetlands

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