Optimal Mowing Regime in Enhancing Biodiversity in Seasonal Floodplains along Engineered Channels

Tsz Kin Calvin Leung, Ken Ying Kin So, Bond Ting Wing Shum and Billy Chi Hang Hau
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Tsz Kin Calvin Leung: Division of Ecology & Biodiversity, School of Biological Sciences, The University of Hong Kong, Pok Fu Lam, Hong Kong
Ken Ying Kin So: Division of Ecology & Biodiversity, School of Biological Sciences, The University of Hong Kong, Pok Fu Lam, Hong Kong
Bond Ting Wing Shum: Division of Ecology & Biodiversity, School of Biological Sciences, The University of Hong Kong, Pok Fu Lam, Hong Kong
Billy Chi Hang Hau: Division of Ecology & Biodiversity, School of Biological Sciences, The University of Hong Kong, Pok Fu Lam, Hong Kong

Sustainability, 2022, vol. 14, issue 7, 1-16

Abstract: The vegetation grown on grasscretes along channelized rivers have been regularly mown in Hong Kong. However, no baseline information on the relationship between different mowing regimes and the biodiversity of such riverbed vegetation is available. We therefore carried out a manipulative experiment along a channelized river to test the effect of mowing frequency and intensity on the abundance and species richness of terrestrial biodiversity. We conducted point counts and transect counts to survey birds, butterflies and Odonates, night surveys for amphibians and reptiles, quadrat surveys for vegetation and sweep net and pan traps for other macroinvertebrates. The results from Generalized Linear Mixed Models (GLMMs) showed a taxon-specific effect of mowing regime. Bird species richness was significantly suppressed in plots mown with high frequency. Both butterfly abundance and species richness were greatly enhanced by low intensity and low frequency mowing. Odonate abundance, and the abundance and species richness of other macroinvertebrates remained high whenever a portion of vegetation was retained as refuge. Amphibians and reptiles did not prefer to utilize the vegetation grown on grasscretes, and thus showed no impact from different mowing regimes. The overall species richness of vegetation was not affected by mowing regimes, but the domination of tall invasive Brachiaria mutica was suppressed by any mowing activity. To cater for the need of most taxa, we propose a mosaic mowing regime, in which most parts along the channelized river could be mown infrequently to 600 mm tall while some of the patches remain unmown.

Keywords: biodiversity conservation; engineered channels; flood management; floodplain; mowing regime; river; vegetation management (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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