豫南油茶林土壤养分化学计量及评价OACSTPCD

In order to improve the yield and quality of Camellia oleifera in Xinyang and promote the balanced fertilization of C.oleifera woodland,based on 10 C.oleifera forest sample sites in Guangshan county,four soil profile depth stratified samples of[0,10)cm,[10,20)cm,[20,40)cm and[40,60)cm were collected,the indexes of pH,total nitrogen,hydrolyzed nitrogen,total phosphorus,quick-acting potassium,etc.were analyzed,and the evaluation standard of soil nutrient in oil tea plantation were proposed to evaluate and classify soil nutrient status in the sample sites.The soil nutrient evaluation standard was proposed to evaluate and grade the soil nutrient status of the sample points.The results showed that:Soil pH fluctuated little(4.40～6.40),total nitrogen content fluctuated greatly and was low(0.021%～0.211% ),and only 10% reached the standard of Grade Ⅰ oil tea woodland;hydrolyzable nitrogen and quick-acting potassium content was moderate,with 10% and 70% reaching the Grade Ⅰ and Ⅱ,respectively;The effective phosphorus was extremely variable,with only 10% meeting the Grade Ⅰ;Total phosphorus was generally of Grade Ⅲ,and the content of total potassium was better,with 50% meeting the Grade Ⅰ and Ⅱ standards.Combined with the results of the survey,it is suggested that,for oil tea woodlands with high nutrient ratings,the reasonable fertilization should be emphasized to maintain the balance of soil nutrients;for medium-and low-nutrient-rated woodlands,fertilizer application should be intensified to increase soil nutrient content,and the targeted fertiliza-tion and management should be carried out on new and old different oil tea woodlands.