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Net aerial primary production (NAPP) of the marsh macrophyte Scirpus maritimus estimated by a combination of destructive and non-destructive sampling methods

De Leeuw, J. and Wielemaker, A. and De Munck, W. and Herman, P.M.J. (1996) Net aerial primary production (NAPP) of the marsh macrophyte Scirpus maritimus estimated by a combination of destructive and non-destructive sampling methods. Vegetatio, 123, 101-108. ISSN 0042-3106.

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Official URL: http://dx.doi.org/10.1007/BF00044892

Abstract

Net aerial primary production (NAPP) of marsh macrophytes is usually estimated either by destructive sampling techniques or by phenometric techniques. Destructive methods, however, are thought to be inaccurate while phenometric techniques are very labour intensive. In this study a new method is presented which allows an accurate and more efficient estimation of NAPP. The method combines destructive sampling to determine end-of-season biomass and phenometric techniques to estimate the mortality of biomass before the end of the season. NAPP is derived through summation of these two estimates. Techniques needed to calculate the precision of the NAPP estimate are provided. The so called hybrid technique was used to estimate NAPP of Scirpus maritimus i,. in a brackish marsh along the Westerschelde estuary, the Netherlands. Estimated NAPP was 1372 g m(-2). End- of-season biomass accounted for 1 106 g m(-2), while mortality contributed 266 g m(-2). Precision of the end-of-season biomass and the mortality estimates, expressed as coefficient of variation, was 18.2 and 26.0% respectively. The precision of the resultant, NAPP, was higher: 17.2%. These results indicate that NAPP could be estimated with a higher precision than end- of-season biomass. This contradicts the view that the accuracy of NAPP estimates can only be improved at the expense of its precision. [KEYWORDS: aboveground production; accuracy; methodology; phenometric techniques; precision; salt marsh; vegetation Salt-marsh; spartina-alterniflora; coastal louisiana; biomass; angiosperms; frequency]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:10390
Deposited On:25 Nov 2011 01:00
Last Modified:31 Mar 2014 10:43

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