Estimating Seed Production of Common Plants in Seasonally Flooded Wetlands

Laubhan, Murray K.; Fredrickson, Leigh H.

doi:10.2307/3808831

Cited by 29 publications

(43 citation statements)

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“…measurements (Laubhan and Fredrickson 1992). Beggartick seed biomass was estimated by drying all seed collected within the sample frame at 50 ° C for 24 hours and weighing samples to the nearest 0.1 g. Four soil cores also were randomly collected from each control, spring-burned, and summer-burned site using a 15-cm soil auger.…”

Section: Data Collectionmentioning

confidence: 99%

Effects of prescribed fire on moist-soil vegetation and soil macronutrients

Laubhan

1995

Wetlands

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Plant succession and various environmental conditions can decrease productivity of wetlands managed intensively for wildlife. Although prescribed fire frequently is used to alter plant composition and structure in semipermanent wetlands, the impacts of fire on species composition and production of seed in moist-soil impoundments have not been quantified. Therefore, I compared species composition, seed produclion, and soil macronutrient concentrations at the end of the growing season on unburned control sites (n = 3) and sites burned in spring (n = 3) and summer (n = 3) in southeast Missouri. Sites burned in spring contained a greater (P _ 0.05) percent cover of beggarticks (Bidens spp. [31.4 + 4.7%]) and ricecut grass (Leersia oryzoides [50.3 -4-7.0%]) than control and summer-burned sites. The percent cover of marsh elder (Ira ciliata) was reduced (P < 0.05) on spring-burned sites (16.6 -2.2%) compared to control sites (25.2 +-2.30/0) but was lowest on sites burned in summer (0.2 + 0.2%). In contrast, the frequency of occurrence (100.0 + 0.0%) and percent cover (76.9 + 5.9%) of bare ground was greater (P < 0.05) on sites burned in summer than on control and spring-burned sites. Summer fires also increased (P < 0.05) the frequency of occurrence and percent cover of morning glory (lpornoea purpurea [30.0 +_ 10% occurrence; 0.4 + 0.1% coverl) and sesbania (Sesbania exaltata [70.0 + 10.0% occurrence; 5.3 _+ 0.5% cover]). Total seed biomass also differed (P < 0.05) among treatments; sites burned in spring produced the most seed (33.7 +__ 3.9 g m ~), followed by control (12.6 g m -z) and summer-burned sites (0.0 _+ 0.0 g m-~). Soil pH, organic matter content, neutralizable acidity, cation exchange capacity, and concentrations of P, K, Ca, and NO3-N did not differ (P > 0.05) among control sites and sites burned in spring and summer. In general, burning in spring improved habitat and food conditions for waterfowl, whereas burning in summer reduced the prevalence of both desirable and undesirable vegetation and created habitat conditions that favored shorebirds.

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Section: Data Collectionmentioning

confidence: 99%

Effects of prescribed fire on moist-soil vegetation and soil macronutrients

Laubhan

1995

Wetlands

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“…Laubhan and Fredrickson (1992) predicted seed yield of moist-soil plants in Mississippi using phytomorphological measurements and multiple linear regression. Using the same method, Gray et al (1999) found inconsistency in predictor variables, suggesting model-site specifi city.…”

Section: Availability Of Foodmentioning

confidence: 99%

Restoring Wetlands for Wildlife Habitat

Ramseier

Klötzli

Bollens

et al. 2009

The Wetlands Handbook

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“…Obtaining accurate estimates of seed production is thus a desirable component of waterfowl habitat quality assessment. Laubhan and Fredrickson (1992) describe a method (hereafter, "the LF Method") for estimating moist-soil plant seed production, using a 0.0625-m 2 sampling quadrat to quantify density of several species. A representative individual of each species within the quadrat is selected, and inflorescence dimensions are used to predict seed yield from regression equations (Laub han .…”

Section: Introductionmentioning

confidence: 99%

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“…Using methods similar to Laubhan and Fredrickson (1992), we developed predictive equations for seed production of six additional herbaceous wetland species. Five of our six equations had precision greater or equal to those of Laubhan and Fredrickson (1992), Thus, applying the two sets of available regression equations simultaneously should not produce biased seed-yield estimates. We evaluated the effect of assessing seed production with both sets of equations using a data set collected at Back Bay National Wildlife Refuge, Virginia, USA.…”

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Additional regression equations for predicting seed yield of moist-soil plants

Sherfy

Kirkpatrick

1999

Wetlands

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Laubhan and Fredrickson (1992) describe a regression-based method for predicting seed yield of moist-soil plants from measurements of inflorescence morphology and provide predictive equations for 11 species. Using methods similar to Laubhan and Fredrickson (1992), we developed predictive equations for seed production of six additional herbaceous wetland species. Five of our six equations had precision greater or equal to those of Laubhan and Fredrickson (1992), Thus, applying the two sets of available regression equations simultaneously should not produce biased seed-yield estimates. We evaluated the effect of assessing seed production with both sets of equations using a data set collected at Back Bay National Wildlife Refuge, Virginia, USA. Addition of seed-production estimates for the 6 species we describe resulted in a 12% higher lolal seed production, suggesting that the originally published method may underestimate total seed yield for some plant communities. We encourage other investigators to develop and publish similar regression models to enhance the utility of this method across habitats and regions.

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Estimating Seed Production of Common Plants in Seasonally Flooded Wetlands

Cited by 29 publications

References 6 publications

Effects of prescribed fire on moist-soil vegetation and soil macronutrients

Effects of prescribed fire on moist-soil vegetation and soil macronutrients

Restoring Wetlands for Wildlife Habitat

Additional regression equations for predicting seed yield of moist-soil plants

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