Variation of soil fertility inEucalyptus robustaplantations after controlled burning in red soil region and its ecological evaluation

Abstract

Variation of soil fertility in Eucalyptus robusta plantations after controlled burning in the red soil region and its ecological evaluation.

Structural equation model was used to evaluate the effects of soil chemical environment, fertility and enzyme activity on eucalyptus biomass

“…Consistent with the findings of previous studies [ 40 ], soils showed a trend of acidification after multi-generational succession, but soil OM and TN were significantly elevated in sprouted second-generation stands, but fast-acting nutrient elements generally showed a decreasing trend. The soil was exposed due to violent soil disturbance (slash and burn) during the new plantation process, which destroyed the soil structure and caused a large loss of SOM and nutrient elements in the T0 and T1 stands [ 41 , 42 ]. After mature felling of newly planted forests, the sprouting and re-growth operation was adopted, which does not require clearing of harvesting residues, so nutrients were gradually accumulated within the soils of second- and third-generation stands [ 43 ], while the accumulation of nutrient elements is also promoted by heavy fertilization.…”

“…destroyed the soil structure and caused a large loss of SOM and nutrient elements in the T0 and T1 stands [41,42]. After mature felling of newly planted forests, the sprouting and re-growth operation was adopted, which does not require clearing of harvesting residues, so nutrients were gradually accumulated within the soils of second-and third-generation stands [43], while the accumulation of nutrient elements is also promoted by heavy fertilization.…”