Above-ground productivity and litter decomposition in a tidal freshwater forested wetland on Bull Island, SC, USA

Özalp, Mehmet; Conner, William H.; Lockaby, B. Graeme

doi:10.1016/j.foreco.2007.03.063

Cited by 31 publications

(16 citation statements)

References 30 publications

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“…Decomposition rate of mixed leaf litter of C. lanceolata and M. macclurei was slightly, but not significantly, faster in mixed stand than pure stand. This result is in agreement with the observations of Pandey et al (2007) who found that decomposition rate of Quercus leaf litter was slightly faster at the mixed forest than pure plantation site at the later stage of litter decomposition and Ozalp et al (2007) who reported that water tupelo leaves on the Big and Little Bull Creeks side decomposed faster than on the Pee Dee River side probably due to microenvironmental factors such as temperature and moisture availability. Difference in decomposition rate between both stands may be primarily due to the difference in site fertility.…”

Section: Discussionsupporting

confidence: 92%

Comparisons of litterfall, litter decomposition and nutrient return in a monoculture Cunninghamia lanceolata and a mixed stand in southern China

Wang

2008

Forest Ecology and Management

171

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Section: Discussionsupporting

confidence: 92%

Comparisons of litterfall, litter decomposition and nutrient return in a monoculture Cunninghamia lanceolata and a mixed stand in southern China

Wang

2008

Forest Ecology and Management

171

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“…While R h was modest (but comparable to other systems; Berbigier et al, 2001;Gough et al, 2008), and the litter inputs (Table 1) were in the middle of the 313-680 g m À2 yr À1 range reported for a number of coastal SE US forests (Megonigal et al, 1997;Ozalp et al, 2007 and references therein), litter inputs were 37% (2005), 5% (2006) and 9% (2007) lower than R h . Given that the R h estimate is a conservative one (0.5 Â SR), it is unlikely that the estimated soil C loss is exaggerated.…”

Section: Soil C Balancesupporting

confidence: 65%

“…the range of 477-1117 g C m À2 yr À1 (Megonigal et al, 1997;Ozalp et al, 2007). It is important to note that in terms of hydrologic regime and average groundwater depth, the current site falls on the dry end of the range of floodplain forests characterized by Megonigal et al (1997).…”

Section: Productivity and Sources Of Uncertaintymentioning

confidence: 98%

Response of carbon fluxes to drought in a coastal plain loblolly pine forest

Noormets

Gavazzi

McNulty

et al. 2009

Global Change Biology

137

104

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Full accounting of ecosystem carbon (C) pools and fluxes in coastal plain ecosystems remains less studied compared with upland systems, even though the C stocks in these systems may be up to an order of magnitude higher, making them a potentially important component in regional C cycle. Here, we report C pools and CO 2 exchange rates during three hydrologically contrasting years (i.e. 2005-2007) in a coastal plain loblolly pine plantation in North Carolina, USA. The daily temperatures were similar among the study years and to the long-term average, whereas the amount and timing of precipitation differed significantly. Precipitation was the largest in 2005 (147 mm above normal), intermediate in 2006 (48 mm below) and lowest in 2007 (486 mm below normal). The forest was a strong C sink during all years, sequestering 361 AE 67 (2005), 835 AE 55 (2006) and 724 AE 55 (2007) g C m À2 yr À1 according to eddy covariance measurements of net ecosystem CO 2 exchange (NEE). The interannual differences in NEE were traced to drought-induced declines in canopy and whole tree hydraulic conductances, which declined with growing precipitation deficit and decreasing soil volumetric water content (VWC). In contrast, the interannual differences were small in gross ecosystem productivity (GEP) and ecosystem respiration (ER), both seemingly insensitive to drought. However, the drought sensitivity of GEP was masked by higher leaf area index and higher photosynthetically active radiation during the dry year. Normalizing GEP by these factors enhanced interannual differences, but there were no signs of suppressed GEP at low VWC during any given year. Although ER was very consistent across the 3 years, and not suppressed by low VWC, the total respiratory cost as a fraction of net primary production increased with annual precipitation and the contribution of heterotrophic respiration (R h ) was significantly higher during the wettest year, exceeding new litter inputs by 58%. Although the difference was smaller during the other 2 years (R h : litterfall ratio was 1.05 in 2006 and 1.10 in 2007), the soils lost about 109 g C m À2 yr À1 , outlining their potential vulnerability to decomposition, and pointing to potential management considerations to protect existing soil C stocks.

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“…Variation in extent and duration of flooding has been shown to strongly influence decomposition and nutrient release by altering moisture, temperature, and the amount of aerobic vs. anaerobic respiration occurring (Shure et al 1986, Stoeckel and Miller-Goodman 2001, Ozalp et al 2007). Additionally, differences in hydrological regimes between hummocks and hollows may influence rates of decomposition by altering decomposer communities.…”

Section: Introductionmentioning

confidence: 99%

Effects of Microtopography on Hydrology, Physicochemistry, and Vegetation in a Tidal Swamp of the Hudson River

Courtwright

Findlay

2011

Wetlands

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Hudson River freshwater tidal swamps have dynamic flooding and oxygenation regimes due to daily tidal flushing. Microtopography, small scale differences in elevation, adds even more complexity to inundation patterns and may have important implications for nutrient flow and wetland plant communities. The objective of this study was to determine if differences in inundation between microtopographic features were sufficient to alter physical, chemical, and biological attributes. Microtopography significantly affected flooding duration and redox conditions. Hummocks had lower concentrations of soluble phosphate in their porewater probably due to differing depths of iron oxidation. Hummocks also had lower porewater ammonium concentrations which could be explained by higher plant uptake of nitrogen on hummocks or less ammonium being nitrified and subsequently denitrified in hollows due to lack of oxygen. Decomposition rates were slower in hollows perhaps due to lack of oxygen due to flooding or differing decomposer communities. Fewer herbaceous plant species were found in hollows compared to hummocks perhaps because of hollow's anoxic soils. Microtopography affects freshwater tidal swamp ecosystem function by affecting oxygen penetration, nutrient availability, rates of decomposition, and herbaceous plant species distributions.

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Above-ground productivity and litter decomposition in a tidal freshwater forested wetland on Bull Island, SC, USA

Cited by 31 publications

References 30 publications

Comparisons of litterfall, litter decomposition and nutrient return in a monoculture Cunninghamia lanceolata and a mixed stand in southern China

Comparisons of litterfall, litter decomposition and nutrient return in a monoculture Cunninghamia lanceolata and a mixed stand in southern China

Response of carbon fluxes to drought in a coastal plain loblolly pine forest

Effects of Microtopography on Hydrology, Physicochemistry, and Vegetation in a Tidal Swamp of the Hudson River

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