Hydrology of a forested riparian zone in an agricultural landscape of the humid tropics

Connor, Sarah; Nelson, Paul N.; Armour, J. D.; Hénault, Catherine

doi:10.1016/j.agee.2011.12.006

Cited by 28 publications

(25 citation statements)

References 51 publications

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“…land use, and suggest that with current inputs, the NO x concentrations in the stream are to a variable extent independent of the riparian zone, as Connor et al (2013) suggested for a single site on Behana Ck. Additionally, the patterns of downstream increase in NO x concentrations, and the short residence times of water in the streams, suggest no major in-stream stripping of NO x , in contrast to much larger river systems (e.g.…”

Section: Discussionmentioning

confidence: 80%

“…At small scales the nutrient-stripping effects of riparian zones are variable (e.g. Chestnut and McDowell, 2000;McDowell, 2001;McKergow et al, 2004a,b;Castillo, 2010;Connor et al, 2013) depending on characteristics of the riparian zone and contiguous land, including hydrology (water residence times in particular), soil (especially organic carbon status and reducing conditions in the sub-soil) and vegetation (Decamps et al, 2004;Fisher and Acreman, 2004;de Souza et al, 2013). On Wet Tropics floodplains, intact riparian forest comprises diverse assemblages of trees with dense canopy cover (mainly 'complex mesophyll vine forest '-Webb, 1959;Keir et al, 2015).…”

Section: Introductionmentioning

confidence: 98%

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Water quality variation along streams with similar agricultural development but contrasting riparian vegetation

Connolly

Pearson

Loong

et al. 2015

Agriculture, Ecosystems & Environment

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Section: Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 98%

Water quality variation along streams with similar agricultural development but contrasting riparian vegetation

Connolly

Pearson

Loong

et al. 2015

Agriculture, Ecosystems & Environment

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“…In mixed farmland of Nicaragua, buffers with higher leaf area index and decreased grazing intensity also have higher levels of water absorption and slower overall flow (Niemeyer, Fremier, Heinse, Chávez, & DeClerck, ). In contrast, the limited available evidence indicates greater forest cover may not directly result in greater nitrogen removal (Chaves et al., ; Connor, Nelson, Armour, & Hénault, ).…”

Section: Assessing the Tropical Evidence Basementioning

confidence: 99%

Riparian buffers in tropical agriculture: Scientific support, effectiveness and directions for policy

Luke

Slade

Gray

et al. 2018

Journal of Applied Ecology

115

114

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1. There is a weak evidence base supporting the effective management of riparian ecosystems within tropical agriculture. Policies to protect riparian buffers-strips of non-cultivated land alongside waterways-are vague and vary greatly between countries.2. From a rapid evidence appraisal, we find that riparian buffers are beneficial to hydrology, water quality, biodiversity and some ecosystem functions in tropical landscapes. However, effects on connectivity, carbon storage and emissions reduction remain understudied. Riparian functions are mediated by buffer width and habitat quality, but explicit threshold recommendations are rare. Policy implications.A one-size fits all width criterion, commonly applied, will be insufficient to provide all riparian functions in all circumstances. Context-specific guidelines for allocating, restoring and managing riparian buffers are necessary to minimise continued degradation of biodiversity and ecosystem functioning in tropical agriculture.

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“…The mean regression coefficient of conservation land is close to 0, indicating its limited effect of this land use on NOX removal. A regional study conducted by Connor et al (2013) revealed that high dissolved inorganic nitrogen in humid tropics areas in Queensland, occurs because denitrification may not be sufficient to remove NOX. The positive effects of stream density and slope in Figure 3 B (posterior mean of 0.15 and 0.06, respectively) indicates that NOX can be transported through drainage networks.…”

Section: Nox Modellingmentioning

confidence: 99%

Modelling the impact of land use and catchment characteristics on stream water quality using a Bayesian hierarchical modelling approach in the Great Barrier Reef catchments

Liu

Ryu

Western

et al. 2017

Syme, G., Hatton MacDonald, D., Fulton, B. And Piantadosi, J. (Eds) MODSIM2017, 22nd International Congress on Modelling and Si

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The near-shore ocean ecosystem is influenced by catchment runoff. The Great Barrier Reef has been experiencing significant water quality deterioration over the past 150 years, due in part to agricultural intensification and urban settlement in adjacent catchments (Thorburn et al., 2013). There is a need for us to understand the influences of catchment characteristics on stream water quality, with an aim to mitigate and manage the water quality issue in the terrestrial stream runoff derived from the adjacent Great Barrier Reef catchments. The event-based water quality monitoring data set from the Paddock to Reef Integrated Monitoring Program across six Natural Management Regions provides a potential opportunity to develop a data-driven understanding of catchment characteristics affecting water quality at the catchment scale. This requires a robust and reliable modelling tool to relate the monitoring data to anthropogenic and natural processes. In this study, monitoring data of Total Suspended Solids (TSS) and dissolved Oxidised Nitrogen (NOX) from 32 sites across the Great Barrier Reef catchments are selected as case study constituents due to the high risk they pose to reef health when exported from catchments to the receiving marine environment. Also, these two constituents have distinct biogeochemical processes in catchments. Specifically, TSS is typically conserved (although mobilized and deposited) while travelling through river systems; while NOX can be potentially processed and removed from the system altogether. A Bayesian hierarchical linear modelling framework is adopted, due to its ability to borrow strength among sites, allowing information to be transferred across space, and due to its ability to provide uncertainty of the predictions. The Bayesian hierarchical linear regression model in this study is developed to evaluate the significance of various catchment characteristics (e.g., land uses, catchment topography and geology) on spatial variation in water quality. The main findings of this study are listed as follows, • Sites located in the Burdekin and Fitzroy Natural Management Regions tend to have greater TSS concentrations, illustrated by the modelled site-specific spatial random effects (deviation from the overall average concentration). Additionally, grazing and dry land agriculture land uses are positively correlated with the spatial random effect on TSS. The complexity of interaction between different catchment characteristics (e.g., land use and topography) can potentially result in a negative spatial random effect on TSS, which is reduced in the relatively steeper Great Barrier Reef catchments with a denser stream network. • Sugar cane is one of the most significant NOX contributors according to the modelling results, likely partially due to the excessive application of fertilizers; however, conservation land use has limited effect on NOX removal, indicating denitrification process alone may not be sufficient to remove NOX. The modelling results demonstrate different land management strategi...

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Hydrology of a forested riparian zone in an agricultural landscape of the humid tropics

Cited by 28 publications

References 51 publications

Water quality variation along streams with similar agricultural development but contrasting riparian vegetation

Water quality variation along streams with similar agricultural development but contrasting riparian vegetation

Riparian buffers in tropical agriculture: Scientific support, effectiveness and directions for policy

Modelling the impact of land use and catchment characteristics on stream water quality using a Bayesian hierarchical modelling approach in the Great Barrier Reef catchments

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