红河谷不同林分土壤养分状况研究

Research on Soil Nutrient Status under Different Stands in the Red River Valley

为了掌握秦岭红河谷森林公园不同林分的土壤养分状况,采用野外调查、土样采集及化学分析相结合的方法,对秦岭红河谷南坡优势树种槲栎、橿子栎、鹅耳栎、辽东栎林下土壤养分状况进行了分析比较。结果表明:鹅耳栎可以显著提高林下土壤有机质的积累量,0—20cm土层有机质含量高达97.45g/kg;橿子栎林下土壤碱解氮含量最高,20—30cm土层碱解氮含量为204.92mg/kg;鹅耳栎林对提高速效磷和速效钾含量有积极的作用;槲栎林的保肥效果、缓冲性能较其他林种好。随土层加深,各种养分含量逐渐降低。

Field investigation,soil sample collection and chemical analysis were carrried out in order to obtain the soil nutrient status of different forest types at the Red River Valley in Qinling Mountains.The soil organic matter,alkali hydrolyzable N,available P,K and CEC of four different forest stands including Quercus aliena BL.,Quercus baronii,Carpinus turczaninowii,and Quercus liaotungensis Koidz at the Red River Valley were analyzed and compared.The results showed that Carpinus turczaninowii could significantly increase the level of forest soil organic matter,which was up to 97.45g/kg in the 0—20cm layer;the available nitrogen content was highest in the Quercus baronii forest soil,which was 204.92mg/kg in the 20—30cm layer;the Carpinus turczaninowii had the positive effects on improving the contents of available phosphorus and available potassium;Quercus aliena BL.had better soil nutrient keeping capability and soil buffer capacity than other three species.In general,the soil nutrient contents decreased with the increase of soil depth.