融安县杉木中龄林土壤化学性质与生态化学计量特征研究OA

In order to systematically evaluate degree of soil acidification and status of soil nutrient abundance or deficiency,and provide data basis for targeted cultivation of medium-diameter and large-diameter timbers and sustainable management of Cunninghamia lanceolata in Rong'an county,taking 15-year-old middle-aged C.lanceolata plantations distributed in 9 townships of Rong'an county as research objects,soil samples were collected from 0-20 and 20-40 cm soil layers for determination of relevant soil indicators and calculation of ecological stoichiometric ratios.Results showed that soil in study area was acidic,with pH values ranging from 4.40 to 5.66.Soil total nitrogen content in study area was generally at high level,and available nitrogen content in 0-20 cm soil layer was generally sufficient,but individual township exhibited low available nitrogen content in 20-40 cm soil layer.Soil total phosphorus content in study area was generally sufficient,but available phos-phorus content was extremely low.Potassium deficiency was observed in some townships.Soil C∶N,C∶P and N∶P in study area were low.N∶P ranged from 2.19 to 5.11,suggesting that soils in middle-aged C.lanceolata planta-tions might be limited by nitrogen.Soils in middle-aged C.lanceolata plantations in Rong'an county were se-verely acidified,with extremely low phosphorus availability and localized deficiencies in nitrogen and potassi-um supply.In order to improve soil quality for future cultivation of medium-diameter and large-diameter tim-bers,integrated measures such as acid reduction and phosphorus activation should be adopted.