e-journal

Regression analysis of growth responses to water depth in three wetland plant species

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Abstract.
Background and aims:
Plant species composition in wetlands and on lakeshores often shows dramatic zonation,
which is frequently ascribed to differences in flooding tolerance. This study compared the
growth responses to water depth of three species (Phormium tenax, Carex secta and Typha
orientalis) differing in depth preferences in wetlands, using non-linear and quantile regression
analyses to establish how flooding tolerance can explain field zonation.

Methodology:
Plants were established for 8 months in outdoor cultures in waterlogged soil without standing
water, and then randomly allocated to water depths from 0 to 0.5 m. Morphological and
growth responses to depth were followed for 54 days before harvest, and then analysed by
repeated-measures analysis of covariance, and non-linear and quantile regression analysis
(QRA), to compare flooding tolerances.

Principal results:
Growth responses to depth differed between the three species, and were non-linear.
Phormium tenax growth decreased rapidly in standing water >0.25 m depth, C. secta
growth increased initially with depth but then decreased at depths >0.30 m, accompanied
by increased shoot height and decreased shoot density, and T. orientalis was unaffected by
the 0- to 0.50-m depth range. In P. tenax the decrease in growth was associated with a decrease
in the number of leaves produced per ramet and in C. secta the effect of water depth
was greatest for the tallest shoots. Allocation patterns were unaffected by depth.

Conclusions:
The responses are consistent with the principle that zonation in the field is primarily structured
by competition in shallow water and by physiological flooding tolerance in deep
water. Regression analyses, especially QRA, proved to be powerful tools in distinguishing
genuine phenotypic responses to water depth from non-phenotypic variation due to size
and developmental differences.

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Informasi Detail

Judul Seri

AoB PLANTS

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2012

Deskripsi Fisik

AoB PLANTS 2012: pls043; doi:10.1093/aobpla/pls043

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2012: pls043

Subjek

EKOLOGI TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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