PJB-2024-126
RESPONSE OF FINE ROOT MORPHOLOGY, BIOMASS, PRODUCTIVITY, AND TURNOVER RATEOF FIVE TREE SPECIES ON SOIL SALINITY GRADIENT IN NEWWLY RECLAIMED SALINE SOIL
Zhibao Wang
Abstract
Fine roots (φ≤2 mm) are important participants in plant underground ecological processes and play an important role in the material cycle and energy flow of forest ecosystems. The ecological function of fine roots is often affected by soil saline-alkali characteristics. Therefore, five tree species including Ligustrum lucidum, Salix matsudana, Sapium sebifera, Robinia pseudoacacia and Quercus virginiana whose tree height, diameter at breast height, crown width, and tree age are basically the same in the newly reclaimed salt land on the coast are used as the research object to analyze the response characteristics of fine root morphology, biomass, production, decomposition, and turnover rates of these five tree species to soil salinity gradients. Results showed that soil salinity gradient have a significant effect on plant fine root functional traits. As soil salinity increases, both fine root biomass and productivity of the five tree species decrease with a slower turnover rate in low-salt, medium-salt and high-salt areas. Meanwhile, the growth depth of fine roots becomes shallower, causing niche differentiation of fine roots and changing the allocation strategy of fine root biomass. Fine roots adapt to salt stress environments by changing structural characteristics such as increasing diameter, volume, surface area and reducing total length. The results of this study can provide scientific basis for the selection of saline-alkali land greening tree species and the formulation of saline-alkali land greening strategies.
To Cite this article:
Download
