Morphological and physiological responses to burial depth and sediment type in the wetland macrophyte Miscanthus sacchariflorus
Pan, Ying; Xie, Yonghong; Li, Feng; Pan, Baihan
published: Apr 1, 2012
ArtNo. ESP141018003007, Price: 29.00 €
The aim of this study is to elucidate how the wetland macrophyte Miscanthus sacchariflorus acclimatizes to sedimentation by investigating growth, morphology and nutrient content in a five month greenhouse experiment under five treatments: no burial, 6 cm sand, 6 cm clay, 12 cm sand and 12 cm clay (using one time burial). Compared to no burial treatment, biomass accumulation decreased only in the 12 cm sand burial treatment (9.5 versus 13.7 g plant−1). As depth of burial increased under both the sand and clay treatments, stem and leaf mass ratios, root diameter and P content in stems increased but root mass ratio and root length decreased. At 6 cm deep root mass ratio, mean root length and specific root length (SRL) were higher, while leaf and stem mass ratios, root diameter, P content in stems and N content in roots and leaves were lower in the sand than in the clay burial treatments. At 12 cm deep, only root mass ratio was higher, while stem mass ratio, N and P contents in roots were lower in the sand than in the clay burial treatments. This data indicates that the growth of M. sacchariflorus is not influenced by shallow burial through adjustments of biomass allocation and root morphology, and that clay facilitates M. sacchariflorus in acclimatizing to deep burial due to sufficient nutrient supply.