Evaluation of Soil Quality and Characterization of Soil Fertility Obstacle Factors in Eucalyptus Plantations in South Subtropical Region from 2013 to 2022
Taking eucalypt plantations in Guangxi Paiyangshan State-owned Forest Farm from 2013 to 2022 as research object,13 soil chemical properties including pH,organic matter content,macro-nutrients,medium-nutrients and micro-nutrients were compared,and five different evaluation methods were used to comprehensively evaluate soil quality. The latter trait was evaluated using the rank-sum ratio comprehensive evaluation method,superiority and inferiority solution distance methods,principal component analyses,factor analyses method and the entropy method. The results indicated that eucalypt plantation soils showed high acidity,severe phosphorus deficiency,and partial lack of medium and micro-nutrient elements over the past decade,though the soil fertility showed an overall upward trend. The results of the five comprehensive evaluations were consistent. The soil fertility quality at different depths in 2022 were higher than that at the same depths in 2013,and the soil fertility quality at the upper depth was higher than that at the lower depth. Among the 13 soil chemical properties of eucalypt plantations evaluated in 2013 and 2022,18 'obstacle factors' were extracted,of which 56.0％ and 44.0％ were mild and severe obstacle factors,respectively. The contents of pH,organic matter,total nitrogen,total potassium,available potassium,exchangeable calcium and magnesium were obstacle factors in both years,and exchangeable calcium and pH were severe obstacle factors. The soil obstacle factors and severe obstacle factors in 2013 were higher than those in 2022. In the eucalypt plantation soils in 2013,the severe obstacle factors were total phosphorus,available phosphorus,exchangeable calcium,exchangeable magnesium and total nitrogen. In the eucalypt plantation soils in 2022,the severe obstacle factors were exchangeable calcium,pH value and exchangeable magnesium. To a certain extent,large-scale and long-term management of eucalypt plantations could easily cause soil fertility degradation and the reduction of nutrient levels of a large number of elements and medium and trace elements. It is necessary to formulate management strategies according to local conditions to reduce the occurrence of soil obstacles and improve plantation soil fertility and productivity to a certain extent.
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