丝栗栲幼苗对不同氮含量及形态的营养响应  

Growth Response of Castanopsis fargesii Seedlings to Nitrogen Nutrition

作　　者：顾红梅[1] 邓光华[1] 翁贤权 邹娜[1,3] 杨海燕[1] 

机构地区：[1]江西农业大学园林与艺术学院,江西南昌330045 [2]福建省南平峡阳国有林场,福建南平353005 [3]江西农业大学江西省竹子种质资源与利用重点实验室,江西南昌330045

出　　处：《江西农业大学学报》2016年第2期312-318,共7页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家自然科学基金青年科学基金项目(31300521);高等学校博士学科点专项科研基金(20133603120001)~~

摘　　要：采用可控环境盆栽方法研究丝栗栲幼苗对不同氮供应强度和形态的响应。结果表明,在各浓度氮素形态供应条件下丝栗栲幼苗都能正常生长,但在低氮条件下不同氮素形态造成的生长差异很小;随着氮浓度的提高,各生长指标在铵氮或铵硝混合氮源供应条件下优于以硝为唯一氮源。在pH 3.8条件下,丝栗栲幼苗能正常生长,而且生长各指标对不同氮素形态具有pH 5.8条件下相似的响应特征。研究结果表明,丝栗栲幼苗能够在氮素适当波动的酸性土壤环境中生长,人工培育过程中供应较高浓度的铵氮或铵硝混合氮源更好。Seedlings of Castanopsis fargesii were supplied with different contents of nitrogen as nitrate,ammonium,or both in vermiculite culture in a controlled environment.The seedlings grew well with all contents of NH＋4and NO-3as the sole N source or combination. Under low N concent（ 0. 4 mmol / L）,there was little growth difference among each N forms. However,the seedlings showed greater growth when supplied with NH＋4,either alone or in combination with NO-3,than when supplied with NO-3alone with the increase of N nutrition.The seedlings grew well at p H 3.8 and showed similar growth response to N source supplied as that of p H 5.8.These results suggest that the Castanopsis fargesii has the ability to grow in acidic areas with variable N sources,however it may be better to grow in soils with high NH＋4concentrations.

关 键 词：丝栗栲 幼苗 氮含量 氮形态 生长响应 

分 类 号：S792.17[农业科学—林木遗传育种]