The role of bio-based plant residues in sustainable nutrient management and the growth of live oak (Quercus virginiana) saplings in urban landscape in southeastern Louisiana.

摘要

Previous studies indicated that bio-based mulch applications in urban landscapes promote tree growth. However, the impacts of selected bio-based plant residues with high carbon to nitrogen ratios on nutrient management and the growth of Live Oak (Quercus Virginiana) Saplings have not been fully quantified in urban landscape in Southeastern Louisiana. A three-year, randomized complete block design field study was conducted to examine the impacts of five bio-based mulches on soil nutrients, organic matter, moisture, temperature, CO2 efflux, carbon, pH, as well as foliar nutrients and the growth of Live Oak Saplings. Soil nutrients and foliar nitrogen contents were significantly higher in the mulched plots than in the control plots. Soil moisture in the mulched plots was significantly higher than the control, but the soil temperature in mulched plots were lower compared to the control. Soil CO2 effluxes were significantly higher in the mulched plots compared to the control. Soil carbon and organic matter contents significantly increased in the mulched plots compared to the NM plots. MH mulch increased soil pH while CP, OT, PB, and PN reduced soil pH. Trees growing in the mulched plots had larger stem diameters, crown spread, and taller than the control. The C:N ratios of the mulches influenced N mineralization and MH mulch significantly increased nitrogen content of the soil.