Mangrove Ecosystems Rehabilitation in Cameroon: Effects of Two Abiotic Factors on the Growth of Rhizophora Seedlings

Din N, Boubakary S, Leopold EKG, Laurant NM, Alphonse KS, Flavien KME, Sarah MI and Francois MM

Published on: 2019-11-17

Abstract

Mangrove ecosystems are undergoing anthropogenic and natural pressures worldwide. Reforestation projects have been developed but very few are achieving the expected goal. Data on the parameters that influence the growth and development of seedlings in natural conditions appear as key factors. The objective of this work located in the Wouri estuary mangroves is to evaluate the impact of light and conservation period of propagules on seedling growth of Rhizophora spp. Four packages of 120 propagules each of the above species were harvested from tree shaking and were preserved 28 days, 14 days, 7 days and 0 day respectively. A fifth package was constituted with 120 propagules gathered from mangrove substrate. The propagules were distributed into three types of nurseries (lighted, semi-lighted and unlighted) and planted the same day. The development of radicles was found from the 14th day during the conservation period. No leaf appearance or perceptible color change of the seed coat were observed throughout this period. The best conservation period was 7 days associated with a semi-lighted nursery. The largest length of the seedlings in any nursery after eight weeks was 56.90 ± 6.74 cm and the average diameter is 1.32 ± 0.04 cm. The sproductions of seedlings in semi-lighted nursery appear to be the most effective approach.