Evaluating soil and cocopeat substrates for mangrove (Rhizophoraceae) propagation
摘要
Successful mangrove restoration relies heavily on optimizing nursery substrates to ensure early seedling establishment. This study evaluated the effects of natural soil and cocopeat on the early growth and survival of three Rhizophoraceae species (Rhizophora mucronata, Kandelia candel and Ceriops tagal) over a four-months cultivation period. Survival rates were high across all cohorts (75–85% for K. candel, 85–90% for R. mucronata and 90–95% for C. tagal). Cocopeat consistently supported marginally higher establishment across species, indicating that its enhanced porosity and structural moisture retention properties optimize initial propagule stabilization under controlled nursery conditions. Generalized Linear Model (Gamma regression; Poisson log-linear model) revealed early mangrove development was dictated by species-specific strategies rather than substrate selection. Species variations significantly controlled vertical shoot elongation (Wald chi2 = 41.57, df = 2, p < 0.001) and leaf production (Wald chi2 = 22.37, df = 2, p < 0.001). Pairwise Sidak testing isolated a clear hierarchy, K. candel achieved maximum mean shoot length 13.2 cm, 95% CI (9.13, 17.34) and leaf counts 4.50, 95% CI (3.84, 5.15), significantly outperforming C. tagal (3.37 cm and 2.50 leaves, p < 0.001). Crucially, standalone substrates exhibited complete statistical parity across shoot length (p = 0.374), leaf count (p = 0.845), leaf length (p = 0.444) and leaf width (p = 0.559), proving commercial cocopeat successfully replicates native soil support without inducing stunting. Overall, these findings underscore that while early structural allocation is species-dependent, cocopeat serves as a highly scalable, low-mortality alternative to native soil, optimize stock quality and restoration logistics.