Convergent Hydraulic Redistribution and Groundwater Access Supported Facilitative Dependency Between Trees and Grasses in a Semi‐Arid Environment

Lee, Esther; Knowles, John F.; Minor, R. L.; Tran, Newton; Barron‐Gafford, Greg A.; Scott, Russell L.

doi:10.1029/2020wr028103

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…For example, California, United States, forecasts more frequent occurrences of extremely dry and wet seasons in the twenty-first century (Swain et al, 2018). An increase in frequency and intensity of extreme events has also been observed over East Asia during the past decades partially due to a shift of high-frequency tropical cyclones toward the north (Lee et al, 2021;Ren et al, 2021). A global study projected a permanent shift of heavy precipitation events over a few days to months at the end of the twenty-first century (Marelle et al, 2018).…”

Section: Discussionmentioning

confidence: 97%

“…Each canopy layer has a unique photosynthesis process in sunlit and shaded leaves under microenvironment conditions. This model has been widely used to enhance the understanding over a gradient of contrasting ecosystems, including forest (Quijano et al, 2012(Quijano et al, , 2013Quijano and Kumar, 2015;Richardson and Kumar, 2020), semiarid (Lee et al, 2018(Lee et al, , 2021, agricultural (Drewry et al, 2010a(Drewry et al, ,b, 2014Le et al, 2011), and green roof (William et al, 2016) settings. In this paper, we briefly describe soil moisture, plant water uptake, and soil temperature dynamics, but not in details.…”

Section: Ecohydrological Modelmentioning

confidence: 99%

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Effects of elevated temperature and abnormal precipitation on soil carbon and nitrogen dynamics in a Pinus densiflora forest

Woo

Seo

2022

Front. For. Glob. Change

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Forests have the largest terrestrial nutrient pools. The loss of soil carbon and nitrogen in forests under ongoing climate warming is subject to severe environmental degradation. To mitigate the negative effects of global warming on soil carbon and nitrogen in forest, it is important to obtain a better understanding of how elevated temperature and altered precipitation variability impact soil nutrient dynamics. To explore such interactions, we coupled an eco-hydrological model (Multi-Layer Canopy model, MLCan) with a biogeochemical model and applied the combined model to Pinus densiflora forest in Gwangneung Experimental Forest, South Korea, from 2004 to 2020. Our results showed that there was a time lag of 4 years to trigger soil organic carbon losses under the elevated temperature of +1.11°C during 2014–2020 compared to 2010–2013. A temperature rise over a prolonged period increased microbial biomass and activity, stimulating soil organic carbon decomposition. The combination of soil nitrate accumulation and exceptional but expected delay in heavy precipitation seasons of 2 months led to nitrate leaching four times higher than the average at 1 m depth in 2010. Reduced evapotranspiration and heavy precipitation during early fall caused intense subsurface water flux, resulting in a great increase in the risk of nitrate leaching. Our results highlight that the impacts of global warming on soil carbon decompositions has a time lag of 4 years and changes in precipitation characteristics will lead to excessive nitrate loss in P. densiflora forests under climate change.

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Section: Discussionmentioning

confidence: 97%

Section: Ecohydrological Modelmentioning

confidence: 99%

Effects of elevated temperature and abnormal precipitation on soil carbon and nitrogen dynamics in a Pinus densiflora forest

Woo

Seo

2022

Front. For. Glob. Change

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“…The correlation between vegetation coverage, NDVI and GD is often used to reveal the succession process of vegetation community [30][31][32]. The water consumption characteristic of vegetation is also an important factor in determining the suitable ecological water level, especially under the action of water stress; the absorption and utilization capacities of groundwater by roots are different [33][34][35], leading to different GEF. In arid regions, natural vegetation will choose the most suitable water source for absorption and utilization according to different external hydrological conditions and meet its own growth and development needs [36,37].…”

Section: Effects Of Vegetation Water Use Sources On Gef In Arid Regionsmentioning

confidence: 99%

Influencing Factors and Evaluation of Groundwater Ecological Function in Arid/Semiarid Regions of China: A Review

Cui,

Yan,

Wang

et al. 2024

Sustainability

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In arid and semi-arid areas, due to drought climate and shortage of water resources, groundwater is crucial for natural ecological protection and economic development. It serves a dual role as a resource function and an ecological function. However, with the continuous improvement of the exploitation and utilization of groundwater by human activities during rapid economic development, the phenomenon of groundwater overexploitation is becoming more and more serious, which has destroyed the natural balance of groundwater recharge and discharge. As a result, natural vegetation has lost the maintenance of the ecological function of groundwater, and a series of ecological and environmental problems have occurred, such as natural vegetation degradation, land desertification, sandstorms, and so on. In recent years, scholars have carried out research on groundwater resource management and optimization of water resource allocation, trying to solve the problem of water balance in arid regions. However, there is still a lack of comprehensive understanding and systematization regarding influencing factors and degeneration mechanisms related to groundwater's ecological function. By summarizing and analyzing the previous research results, this paper summarizes the influencing factors, evaluation methods, existing problems and future directions of groundwater ecological function research in China to provide a reference for rational exploitation and utilization of groundwater and ecological protection. This paper is divided into four main contents. The first part introduces the definition of groundwater ecological function (GEF); the second part summarizes the research status of influencing factors of GEF, including the groundwater table depth, vegetation root system and lithologic structure of vadose zone, etc.; the third part analyzes the evaluation of groundwater ecological function; the fourth part discusses the existing problems in the study of groundwater ecological functions, and based on the above research the evaluation framework of GEF is proposed with the Shiyang River basin as a case study; and finally, it highlights the future research directions about GEF.

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“…With the increase of vegetation planting area, the superposition of soil matrix potential and water potential of vegetation roots in vadose zone soil (Zhou et al, 2022). This can cause an increase in upward potential energy, a decrease of the zero flux surface, resulting in a decrease in the space of the vadose zone between the zero flux surface and the groundwater table (Lee et al, 2021) , but not directly consume groundwater. The shrub planting reduces soil erosion and protects the area's scarce groundwater resources.…”

Section: Impact Of Vegetation Types On the Regional Water Cyclementioning

confidence: 99%

Effect of highway greenbelt constrution on groundwater flow in a semi-arid region

Xia,

Dong,

et al. 2023

Preprint

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The highway greenbelt, vigorously promoted in arid and semi-arid areas, has obvious impacts on beautifying the environment, absorbing dust, reducing noise, and maintaining soil and water. Moreover, it affects the characteristics of how water resources are distributed and the regional groundwater cycle. The Hu-Bao highway greenbelt in the northern Tumochuan Plain served as an example in this study. Based on fully grasping the characteristics of the regional groundwater system, we used the 3S classification method and combine the relevant formulas, such as ET0, to calculate the evapotranspiration and water consumption of the green belt and quantitatively analyze the impact of highway greenbelt construction on the regional groundwater cycle. The results indicated that trees, shrubs, and grasses, accounting for 42.17% of the research area, are the predominant plant types in the greening construction area. The area of shrubs is the highest, reaching 17.29%; followed by trees, occupying 15.18%. Grasslands is the smallest, accounting for 9.7%；During the growth season, the total evapotranspiration water consumption in the green belt is 471.35×104m3, whereas trees, shrubs and grasslands is 182.27×104m3, 211.14×104m3,77.94×104m3, respectively. The groundwater recharge in the study area mainly originated from the mountain front lateral recharge, and the main discharge was the evapotranspiration water consumption of green belts. The latter accounts for 3.31 percent of the former. It is obvious that the construction of highway greenbelts has a substantial impact on the distribution of groundwater resources, and long-term evapotranspiration will cause groundwater levels to decline and the amount of accessible water resources to decrease.

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Convergent Hydraulic Redistribution and Groundwater Access Supported Facilitative Dependency Between Trees and Grasses in a Semi‐Arid Environment

Cited by 11 publications

References 43 publications

Effects of elevated temperature and abnormal precipitation on soil carbon and nitrogen dynamics in a Pinus densiflora forest

Effects of elevated temperature and abnormal precipitation on soil carbon and nitrogen dynamics in a Pinus densiflora forest

Influencing Factors and Evaluation of Groundwater Ecological Function in Arid/Semiarid Regions of China: A Review

Effect of highway greenbelt constrution on groundwater flow in a semi-arid region

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