Quantifying aboveground biomass and estimating net aboveground primary production for wetland macrophytes using a non-destructive phenometric technique

Daoust, Robert J.; Childers, Daniel L.

doi:10.1016/s0304-3770(98)00078-3

Cited by 56 publications

(34 citation statements)

References 24 publications

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“…When remote sensing technology is used to retrieve vegetation biomass, the data source and methods influence the inversion precision to a great degree. 55 During training of the ANN, the upper and lower limits came from the survey data. Because they were not the actual values for the wetland vegetation, their use influenced the inversion accuracy.…”

Section: Discussionmentioning

confidence: 99%

Poyang Lake wetland vegetation biomass inversion using polarimetric RADARSAT-2 synthetic aperture radar data

Shen

Liao

Guo

et al. 2015

J. Appl. Remote Sens

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Abstract. Poyang Lake is the largest freshwater lake in China and one of the most important wetlands in the world. Vegetation, an important component of wetland ecosystems, is one of the main sources of the carbon in the atmosphere. Biomass can quantify the contribution of wetland vegetation to carbon sinks and carbon sources. Synthetic aperture radar (SAR), which can operate in all day and weather conditions and penetrate vegetation to some extent, can be used to retrieve information about vegetation structure and the aboveground biomass. In this study, RADARSAT-2 polarimetric SAR data were used to retrieve aboveground vegetation biomass in the Poyang Lake wetland. Based on the canopy backscatter model, the vegetation backscatter characteristics in the C-band were studied, and a good relation between simulated backscatter and backscatter in the RADARSAT-2 imagery was achieved. Using the backscatter model, pairs of training data were built and used to train the back propagation artificial neural network. The biomass was retrieved using this ANN and compared with the field survey results. The rootmean-square error in the biomass estimation was 45.57 g∕m 2 . This shows that the combination of the model and polarimetric decomposition components can efficiently improve the inversion precision. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Discussionmentioning

confidence: 99%

Poyang Lake wetland vegetation biomass inversion using polarimetric RADARSAT-2 synthetic aperture radar data

Shen

Liao

Guo

et al. 2015

J. Appl. Remote Sens

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“…leaf height, culm diameter at base) to dry weight biomass (e.g., Daoust & Childers, 1998; Typha spp., Schoenoplectus spp., and S. californicus individuals with seeds heads produced a 208 different phenometric model from those without seed heads. We generated separate models for S. 209 americanus and S. maritimus to represent their unique morphology.…”

Section: Non-destructive Phenometric Models 190mentioning

confidence: 99%

Aridland constructed treatment wetlands I: Macrophyte productivity, community composition, and nitrogen uptake

Weller

Childers

Turnbull

et al. 2016

Ecological Engineering

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Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Ecological Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Ecological Engineering, December 2016December , 97, 649-657, 10.1016December /j.ecoleng.2015 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Urbanized areas increasingly rely on constructed treatment wetlands (CTW) for cost 9 effective and environmentally-based wastewater treatment. Constructed treatment wetlands are 10 particularly attractive treatment options in arid urban environments where water reuse is 11 important for dealing with scarce water resources. Emergent macrophytes play an important role 12 in nutrient removal, particularly nitrogen (N) removal, in CTW. However, the role of plant 13 community composition in nutrient removal is less clear. Numerous studies have shown that 14 macrophyte species differentially affect N uptake processes (e.g.: direct plant uptake, coupled 15 nitrification-denitrification, soil accretion). However, many of these studies have been based on 16 small-scale experiments and have been carried out in mesic environments, which means that 17 their findings are difficult to extrapolate to aridland CTW systems. Our study sought to examine 18 the relationships among emergent macrophyte productivity, plant community composition, and 19 N uptake [by both the plants and the entire ecosystem] at a 42 ha CTW in arid Phoenix, Arizona, 20 USA. We quantified above-and belowground biomass bimonthly and foliar N content annually 21 for four species groups (Typha latifolia + T. domingensis., Schoenoplectus californicus + S. 22 tabernaemontani, Schoenoplectus acutus, and Schoenoplectus americanus) from July 2011 to 23 September 2013. We quantified dissolved inorganic N fluxes into and out of the system and 24 compared plant N removal to total system fluxes. Additionally, we estimated monotypic N 25 content for each to compare the system's current community composition and plant N removal to 26

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“…Measurements began in January 2000 and continued through January 2009. Biomass was estimated with an allometric relationship developed for Everglades Cladium that relates leaf basal diameter and length to biomass (Daoust and Childers, 1998). Cladium aboveground carbon content was estimated from these data and Cladium leaf carbon content at the site (0.49 g C g biomass -1 ) (Childers, 2008).…”

Section: Leaf Area Index and Aboveground Biomassmentioning

confidence: 99%

Seasonal differences in the CO2 exchange of a short-hydroperiod Florida Everglades marsh

Schedlbauer

Oberbauer

Starr

et al. 2010

Agricultural and Forest Meteorology

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Although wetlands are among the world's most productive ecosystems, little is known of long-term CO 2 exchange in tropical and subtropical wetlands. The Everglades is a highly managed wetlands complex occupying >6000 km 2 in south Florida. This ecosystem is oligotrophic, but extremely high rates of productivity have been previously reported. To evaluate CO 2 exchange and its response to seasonality (dry vs. wet season) in the Everglades, an eddy covariance tower was established in a short-hydroperiod marl marsh. Rates of net ecosystem exchange and ecosystem respiration were small year-round and declined in the wet season relative to the dry season. Inundation reduced macrophyte CO 2 uptake, substantially limiting gross ecosystem production. While light and air temperature exerted the primary controls on net ecosystem exchange and ecosystem respiration in the dry season, inundation weakened these relationships. The ecosystem shifted from a CO 2 sink in the dry season to a CO 2 source in the wet season; however, the marsh was a small carbon sink on an annual basis. Net ecosystem production, ecosystem respiration, and gross ecosystem production were -49.9, 446.1 and 496.0 g C m -2 year -1 , respectively. Unexpectedly low CO 2 flux rates and annual production distinguish the Everglades from many other wetlands. Nonetheless, impending changes in water management are likely to alter the CO 2 balance of this wetland and may increase the source strength of these extensive short-hydroperiod wetlands.3

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Quantifying aboveground biomass and estimating net aboveground primary production for wetland macrophytes using a non-destructive phenometric technique

Cited by 56 publications

References 24 publications

Poyang Lake wetland vegetation biomass inversion using polarimetric RADARSAT-2 synthetic aperture radar data

Poyang Lake wetland vegetation biomass inversion using polarimetric RADARSAT-2 synthetic aperture radar data

Aridland constructed treatment wetlands I: Macrophyte productivity, community composition, and nitrogen uptake

Seasonal differences in the CO2 exchange of a short-hydroperiod Florida Everglades marsh

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