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Synergistic Effects of Land Cover, Rain and Fog Seasonality, and Interannual Precipitation Variability

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Synergistic Effects of Land Cover, Rain and Fog Seasonality, and Interannual Precipitation Variability Global Change Biology (2009), doi: 10.1111/j.1365-2486.2009.01985.x Water inputs across a tropical montane landscape in Veracruz, Mexico: synergistic effects of land cover, rain and fog seasonality, and interannual precipitation variability ALEXANDRA G. PONETTE-GONZA´ LEZ*, KATHLEEN C. WEATHERSw and LISA M. CURRANz *Yale School of Forestry & Environmental Studies, 195 Prospect Street, New Haven, CT 06511, USA, wCary Institute of Ecosystem Studies, PO Box AB, Millbrook, NY 12545, USA, zStanford University, 450 Serra Mall Bldg 50, Stanford, CA 94305, USA Abstract Land-cover change can alter the spatiotemporal distribution of water inputs to mountain ecosystems, an important control on land-surface and land-atmosphere hydrologic fluxes. In eastern Mexico, we examined the influence of three widespread land-cover types, montane cloud forest, coffee agroforestry, and cleared areas, on total and net water inputs to soil. Stand structural characteristics, as well as rain, fog, stemflow, and throughfall (water that falls through the canopy) water fluxes were measured across 11 sites during wet and dry seasons from 2005 to 2008. Land-cover type had a significant effect on annual and seasonal net throughfall (NTF o0 5 canopy water retention plus canopy evapora- tion; NTF 40 5 fog water deposition). Forest canopies retained and/or lost to evaporation (i.e. NTFo0) five- to 11-fold more water than coffee agroforests. Moreover, stemflow was fourfold higher under coffee shade than forest trees. Precipitation seasonality and phenological patterns determined the magnitude of these land-cover differences, as well as their implications for the hydrologic cycle. Significant negative relationships were found between NTF and tree leaf area index (R2 5 0.38, Po0.002), NTF and stand basal area (R2 5 0.664, Po0.002), and stemflow and epiphyte loading (R2 5 0.414, Po0.001). These findings indicate that leaf and epiphyte surface area reductions associated with forest conversion decrease canopy water retention/evaporation, thereby increasing throughfall and stemflow inputs to soil. Interannual precipitation variability also altered patterns of water redistribution across this landscape. Storms and hurricanes resulted in little difference in forest-coffee wet season NTF, while El Nin˜ o Southern Oscillation was associated with a twofold increase in dry season rain and fog throughfall water deposition. In montane headwater regions, changes in water delivery to canopies and soils may affect infiltration, runoff, and evapotranspiration, with implications for provisioning (e.g. water supply) and regulating (e.g. flood mitigation) ecosystem services. Keywords: cloud forest, ENSO, fog, highlands, hydrology, land-use change, shade coffee, stemflow, throughfall, tropical hurricanes Received 10 March 2009 and accepted 28 April 2009 has the potential to affect plant population dynamics Introduction and species’ distributions (Asbjornsen et al., 2004; By modifying ecosystem structure and composition, Condit et al., 2004; Engelbrecht et al., 2007; Nepstad land-cover change contributes to the spatiotemporal et al., 2007), ecosystem hydrology and biogeochemistry redistribution of water to the soil surface. Because water (Baron et al., 1998; Nepstad et al., 2002; Farley et al., is a limiting resource for a suite of ecological processes, 2004), as well as evapotranspiration and runoff (Nobre the creation of altered patterns of water availability et al., 1991). Moreover, positive or negative land-atmo- sphere feedbacks that further modify water fluxes can Correspondence: A. G. Ponette-Gonza´lez, tel. 1 (845) 677-7600 ext. lead to ecosystem regime shifts (e.g. cloud forest to 137, fax 1 (845) 677-5976, e-mail: [email protected] woodland) (Lawton et al., 2001; Gordon et al., 2008) r 2009 Blackwell Publishing Ltd 1 2 A. G. PONETTE-GONZA´ LEZ et al. and affect regional climate (Avissar et al., 2002; DeFries tribution (Weathers et al., 2000). The amount of rain et al., 2002). and fog deposited to ecosystems can change consider- Over the past century, various Neotropical montane ably over short distances in mountainous terrain due regions have experienced dramatic and widespread to orographic effects on precipitation (Lovett et al., 1997; changes in land use/land cover (Thomlinson et al., Weathers et al., 2000, 2006; Holder, 2003). Further, 1996; Kammerbauer & Ardon, 1999; Sarmiento & Fro- forest–grassland edges and coniferous vegetation lich, 2002; Cayuela et al., 2006; Kintz et al., 2006). Some have been shown to enhance rain- and fog-water de- of the most prominent land-cover trajectories include: position (e.g. Weathers et al., 1995, 2000, 2001, forest clearing for urban and suburban development 2006; Ewing et al., 2009). Surprisingly, few empirical (Romero & Ordenes, 2004), surface and subsurface studies have examined the influence of land cover mining (Bury, 2005), and cattle grazing (Sarmiento, on water inputs to tropical mountain regions despite 1997); grassland conversion for tree plantation estab- their sensitivity to disturbance and climatic change, lishment (Farley et al., 2004); replacement of agrofores- and the major implications for downstream water try systems with pasture, sugar cane, or other crops resources. and/or coffee intensification (Guhl, 2008); forest degra- Many montane species and ecosystems exhibit low dation through fuelwood harvesting and selective log- resilience to land-use/land-cover changes that affect ging (Ochoa-Gaona & Gonza´lez-Espinosa, 2000); the quantity, type, and timing of water inputs to cano- and agricultural land abandonment and forest succes- pies and soils. For example, epiphyte species’ distribu- sion (Hecht & Saatchi, 2007). Our understanding of tions in Neotropical forests are tightly coupled to how these land-change pathways affect water flows at moisture conditions (Gentry & Dodson, 1987). In high- broad spatial scales is currently constrained by lack of land Mexico, management activities promoting drier information on the hydrological responses of and inter- conditions within tree canopies (e.g. oak coppicing actions among diverse land-cover types (Giambelluca, and stand thinning for coffee production) have been 2002). associated with increased abundance and biomass However, research conducted largely in native and of drought-tolerant epiphyte species (Hietz, 2005; Wolf, planted forests underscores the multiple spatial scales 2005). Seasonally or annually water-limited ecosystems, at which vegetation can mediate water transfers to soil: or those strongly dependent on fog as a water source, leaf morphology (Cavelier & Goldstein, 1989; Brewer & are also highly sensitive to canopy changes (Pounds Smith, 1997; Holder, 2007), tree and stand properties et al., 1999). The documented persistence of fog- (Carlyle-Moses et al., 2004; Nadkarni & Sumera, 2004; dependent rainforest patches at hydrologically margin- Staelens et al., 2006), and landscape features (Cavelier al sites (i.e. aridity and rainfall variability) in Chile et al., 1996; Weathers et al., 2000, 2006) have all been and Australia suggests that reduced fog capture rates shown to govern water inputs to ecosystems. Stemflow, following land-cover change could affect tree sur- for example, is highly dependent on bark texture and vival and regeneration patterns, resulting in profound tree architecture (Ford & Deans, 1978). Trees with compositional shifts within these ecosystems smooth bark and upward oriented branches have great- (Hutley et al., 1997; del-Val et al., 2006; Gutie´rrez et al., er stemflow than trees with fissured bark and depressed 2008). branches (Carlyle-Moses, 2004). The effects of stem In upland areas, vegetation patterns exert control density, tree height, and canopy properties [including over hydrologic processes as well, including evapotran- leaf area index (LAI), canopy cover, crown volume, and spiration, infiltration, soil water storage, and runoff epiphyte loading] on throughfall have yielded conflict- (Bruijnzeel & Proctor, 1995). Although forest conversion ing results, in part, because of the differential effects of often results in lower evapotranspiration rates and vegetation on the vertical and horizontal delivery of higher water yields (Bosch & Hewlett, 1982), land-use water (Levia & Frost, 2006). In general, throughfall change can sometimes have unanticipated conse- volumes increase while stemflow amounts decrease as quences. In northern Thailand, findings indicate that canopy surface area decreases (Stogsdill et al., 1989). sensible heat advection from cultivated sites may con- However, in coastal and montane forests, where fog tribute to high evapotranspiration rates from adjoining water may be a primary component of the dry season or secondary vegetation (Giambelluca et al., 2000). In their annual water budget, clearing or stand thinning may grassland afforestation study, Farley et al. (2004) demon- result in altered canopy fog interception and thus low- strated that loss of soil organic matter under pine er, or higher, throughfall water inputs (Lovett & Re- plantations can lead to significant reductions in soil iners, 1986; Ataroff & Rada, 2000). Moreover, landscape water retention capacity. Deforestation in wet montane features (e.g. vegetation type, elevation, aspect, and regions has also been linked with increased frequency edges) are conditions that also influence water redis- of landslide events (Dai & Lee, 2002; Restrepo & Alvar- r 2009 Blackwell Publishing Ltd, Global Change Biology, doi: 10.1111/j.1365-2486.2009.01985.x WATER INPUTS TO A TROPICAL
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