An event-based approach to understanding the hydrological impacts of different land uses in semi-arid catchments

Wang, Shengping; Zhang, Zhiqiang; McVicar, Tim R.; Zhang, Jianjun; Zhu, Jing; Guo, Jing

doi:10.1016/j.jhydrol.2011.11.035

Cited by 45 publications

(23 citation statements)

References 79 publications

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“…To realize sustainable vegetation restoration in semi-arid regions, soil moisture conditions should first be considered. Based on our results, the introduced vegetation will lead to soil moisture deficits, which indicates that large-scale re-vegetation is unsuitable in this area (Wang et al, 2012b). The introduced vegetation restoration projects have been conducted for decades, so a large-scale soil moisture deficit is appearing in the entire Loess Plateau and other semi-arid areas Sizemskaya et al, 2009).…”

Section: Soil Moisture Availability and Human-introduced Vegetation Rmentioning

confidence: 75%

Response of temporal variation of soil moisture to vegetation restoration in semi-arid Loess Plateau, China

Yang¹,

Wei²,

Chen³

et al. 2014

CATENA

210

109

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Soil moisture is fundamental to ecosystem sustainability in semi-arid regions, and characterizing the response of temporal soil moisture variation to different vegetation types is important for assessing the sustainability of vegetation restoration. In this study, the soil moisture among eight typical types of vegetation is investigated and compared during three rainy seasons. The temporal variations of soil moisture in the near-surface (0-0.4 m), sub-surface (0.4-1.0 m), and deep layers (1.0-2.0 m) are explored to evaluate the ecohydrological effect of vegetation restoration in the semi-arid Loess Plateau of China. The results show that soil moisture content decreases drastically after vegetation restoration, with no significant difference in near-surface soil moisture among the vegetation types but significant differences in the sub-surface and deep soil layers. Introduced vegetation is the main factor affecting the soil moisture deficit below near-surface layers. Secondly, soil moisture is temporally stable in the sub-surface and deep layers, especially in introduced vegetation. This indicates that introduced vegetation consumes excessive amount of soil moisture and induces temporally stable soil desiccation. Soil desiccation with temporal stability cannot provide enough available soil moisture for plants and will inevitably threaten the sustainability of vegetation restoration and the associated ecosystem services. Lastly, high planting density is the main cause of severe soil moisture deficit on a long-term temporal scale. Our study results suggest that the current planting density of introduced vegetation is too high in specific cases and should be optimized with local soil moisture conditions in semi-arid regions.

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Section: Soil Moisture Availability and Human-introduced Vegetation Rmentioning

confidence: 75%

Response of temporal variation of soil moisture to vegetation restoration in semi-arid Loess Plateau, China

Yang¹,

Wei²,

Chen³

et al. 2014

CATENA

210

109

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“…In turn, the area of Caatinga under regeneration displays more heterogeneous vegetation, with a lower soil-cover index, favouring the generation of runoff, which is transported to the lowest areas and increases water availability, especially near the watercourses. Inadequate soil management may therefore result in greater surface runoff and soil loss (ASHAGRIE et al, 2006;WEI et al, 2007;XIAO et al, 2011), while a management that ensures greater ground cover through development of the herbaceous layer may promote greater infiltration of water into the soil, and lower effective precipitation, with improvements in the physical properties of the soil (WANG et al, 2012;RODRIGUES et al, 2013). Destaca-se que se trata de um evento extremo, e assim, independente da ocorrência de veranicos, o evento apresentou elevados coeficientes de escoamento efetivo, com valores de 0,21 e 0,15 para a CR 35 e CR, respectivamente.…”

Section: Resultsmentioning

confidence: 99%

“…Por sua vez, a área com Caatinga em regeneração apresenta vegetação mais heterogênea e com menor índice de cobertura do solo, favorecendo a geração de escoamento, que é transportado para as partes mais baixas e aumenta a disponibilidade de água especificamente nas proximidades dos cursos d'água. Portanto, um manejo inadequado do solo pode resultar em maiores escoamentos superficiais e perdas de solo (ASHAGRIE et al, 2006;WEI et al, 2007;XIAO et al, 2011), enquanto que manejos que garantam maior cobertura do solo, por meio do desenvolvimento do estrato herbáceo, podem promover maior infiltração de água no solo e menor precipitação efetiva, com melhorias nas propriedades físicas do solo (WANG et al, 2012;RODRIGUES et al, 2013 Differences between the values for RC and RC Pe (Table 2) express the high initial abstractions, since the RC Pe only considers events that generate runoff. The high initial abstractions can be explained by the type of soil in the watersheds, with the presence of 2:1 expansive clay (vertic soils) (SANTOS et al, 2016).…”

Section: Resultsunclassified

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Plant cover and hydrological response in a seasonally dry tropical forest (SDTF)

Andrade

Costa²,

Santos³

et al. 2017

AGRO@MBIENTE ON-LINE

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Abstract:The scarcity of information on the processes of rainfall-flow limits understanding of the hydrology of dry regions of the world. In order to minimise the problem, this study was developed to investigate the influence of the characteristics of rainfall events and plant cover on the effective precipitation (Pe) in a seasonally dry tropical forest (SDTF) in the Northeast of Brazil. The study was carried out in two paired watersheds, one with SDTF under regeneration for 35 years (CR35) and the other under thinned SDTF for 5 years (TC). A historical series of five years (2009)(2010)(2011)(2012)(2013) was analysed, with a total of 203 rainfall events, where only those rainfall events that generated a Pe > 1.0 mm were considered. CR35 had a greater number of Pe events (47) than TC (35). Rainfall depth and intensity were the factors that best explained the effective precipitation under both types of vegetation cover. The influence of herbaceous vegetation on the reduction of surface runoff was demonstrated by the smaller runoff depth and the greater potential for soil water storage in the watershed under thinned Caatinga. This fact leads to the conclusion that the technique of thinning is suitable management for Caatinga vegetation, and is capable of promoting the retention of soil water. Resumo: A escassez de informações sobre os processos chuva-deflúvio é uma limitação no entendimento da hidrologia das regiões secas do globo terrestre. Buscando minimizar esta problemática, desenvolveuse este estudo objetivando investigar as influências das características dos eventos pluviométricos e da cobertura vegetal na precipitação efetiva (Pe) em floresta tropical sazonalmente seca (FTSS), no nordeste do Brasil. O estudo foi realizado em duas microbacias emparelhadas, uma com FTSS em regeneração há 35 anos (CR35) e outra com FTSS raleada há 5 anos (CR). Foi analisada uma série histórica de cinco anos (2009)(2010)(2011)(2012)(2013), com um total de 203 eventos pluviométricos, sendo considerados somente os eventos pluviométricos que geraram Pe > 1,0 mm. A CR35 apresentou um maior número de eventos (47) de Pe do que a CR (35). A altura pluviométrica e as intensidades foram os fatores que melhor explicaram a precipitação efetiva em ambas as coberturas vegetais. A influência da vegetação herbácea na redução do escoamento superficial foi evidenciada pelas menores lâminas escoadas e pelo maior potencial de armazenamento de água no solo na microbacia com a Caatinga raleada. Tal fato permite concluir que a técnica de raleamento representa um manejo apropriado para a vegetação da Caatinga, sendo capaz de promover a retenção de água no solo.Palavras-chave: Chuva-deflúvio. Uso da terra. Estrato herbáceo. Semiárido.Revista Agro@mbiente On-line, v. 11, n. 4, p. 258-268, outubro-dezembro, 2017259 Plant cover and hydrological response in a seasonally dry tropical forest (SDTF)

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“…For example, paddy-to-dry-land conversion in the study basin is considered as an effective means to increase inflow into the Miyun Reservoir. Moreover, artificial forest plantations widely implemented during the last 30 years are considered to aggravate water stress in this semi-arid region (Wang et al, 2012). More local vegetation rather than man-made forests with exotic tree species should be established to achieve the desired hydrological functioning of the MYRC.…”

Section: Implications To Water Resources Managementmentioning

confidence: 99%

Impacts of land use change and climate variations on annual inflow into the Miyun Reservoir, Beijing, China

Zheng

Sun

et al. 2016

Hydrol. Earth Syst. Sci.

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Abstract. The Miyun Reservoir, the only surface water source for Beijing city, has experienced water supply decline in recent decades. Previous studies suggest that both land use change and climate contribute to the changes of water supply in this critical watershed. However, the specific causes of the decline in the Miyun Reservoir are debatable under a non-stationary climate in the past 4 decades. The central objective of this study was to quantify the separate and collective contributions of land use change and climate variability to the decreasing inflow into the Miyun Reservoir during . Different from previous studies on this watershed, we used a comprehensive approach to quantify the timing of changes in hydrology and associated environmental variables using the long-term historical hydrometeorology and remote-sensing-based land use records. To effectively quantify the different impacts of the climate variation and land use change on streamflow during different subperiods, an annual water balance model (AWB), the climate elasticity model (CEM), and a rainfall-runoff model (RRM) were employed to conduct attribution analysis synthetically. We found a significant (p < 0.01) decrease in annual streamflow, a significant positive trend in annual potential evapotranspiration (p < 0.01), and an insignificant (p > 0.1) negative trend in annual precipitation during 1961-2008. We identified two streamflow breakpoints, 1983 and 1999, by the sequential Mann-Kendall test and double-mass curve. Climate variability alone did not explain the decrease in inflow to the Miyun Reservoir. Reduction of water yield was closely related to increase in actual evapotranspiration due to the expansion of forestland and reduction in cropland and grassland, and was likely exacerbated by increased water consumption for domestic and industrial uses in the basin. The contribution to the observed streamflow decline from land use change fell from 64-92 % during 1984-1999 to 36-58 % during 2000-2008, whereas the contribution from climate variation climbed from 8-36 % during the 1984-1999 to 42-64 % during 2000-2008. Model uncertainty analysis further demonstrated that climate warming played a dominant role in streamflow reduction in the most recent decade (i.e., 2000s). We conclude that future climate change and variability will further challenge the water supply capacity of the Miyun Reservoir to meet water demand. A comprehensive watershed management strategy needs to consider the climate variations besides vegetation management in the study basin.

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An event-based approach to understanding the hydrological impacts of different land uses in semi-arid catchments

Cited by 45 publications

References 79 publications

Response of temporal variation of soil moisture to vegetation restoration in semi-arid Loess Plateau, China

Response of temporal variation of soil moisture to vegetation restoration in semi-arid Loess Plateau, China

Plant cover and hydrological response in a seasonally dry tropical forest (SDTF)

Impacts of land use change and climate variations on annual inflow into the Miyun Reservoir, Beijing, China

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