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Impacts of fire and phosphorus on sawgrass and cattails in an altered landscape of the Florida Everglades

Ecological Processes 2012年第1期1卷 50-60页

作者： Yegang Wu Ken Rutchey Susan Newman Shili Miao Naiming Wang Fred H Sklar William H Orem Everglades Division South Florida Water Management District3301 Gun Club RoadWest Palm BeachFL 33406USA U.S.Geological Survey MS 95612201 Sunrise Valley DriveRestonVA 20192USA Cardno ENTRIX 339 Whitecrest DriveMaryvilleTN 37801USA.

Introduction:Although fire as a critical ecological process shapes the Florida Everglades landscape,researchers lack landscape-based approach for fire *** interactive effect of fire,nutrients,water depth,and invasive cattails(Typha spp.)on vegetation communities is of special concern for ecosystem *** particular,questions concerning the effect of fire on nutrient release and,by extension,the potential thereof to stimulate sawgrass(Cladium jamaicense Crantz)re-growth and cattail expansion under varying hydrological conditions are of immediate relevance to ecologists and land managers who work to restore the ***:In late April of 1999,a 42,875 ha surface fire,including a 100 ha peat fire,burned the northern section of Water Conservation Area 3A(WCA-3A)in the *** this study,total phosphorus(TP)in soil,surface water,pore-water,and vegetation was sampled at non-burned,surface-burned and peat-burned areas within one and five months after the *** years after the initial fire,field data were collected in a large scale survey to analyze how the 1999 fire affected cattail distribution in the altered landscape of high soil TP and cattail *** GIS maps were utilized to select field sampling locations and to provide additional information for the ***:The analyses showed that five months after the fire,sawgrass biomass re-growth was about 5 times higher in burned areas(611±47 g/m^(2))than in non-burned areas(102±18 g/m^(2)).sawgrass re-growth in water depths less than 30 cm was 4.9±0.4 g/m^(2)/day while sawgrass re-growth in water depths deeper than 60 cm decreased to 0.5±0.3 g/m^(2)/*** biomass re-growth in peat-burned areas was as high as 1,079±38 g/m^(2).The data also showed that post-fire cattail expansion could be related to cattail stands existing before the ***,post-fire cattail appeared more significant expansion in the areas with soil TP above 900 mg/kg than in that with so

关键词： Fire Phosphorus sawgrass Cattails Everglades Water depth Altered landscape Wetlands

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