摘要
应用临界值浓度法、DRIS图解法和指数法等叶片营养诊断分析方法,研究了元谋干热河谷地区的实生印楝人工林产量和品质与叶片养分含量之间的关系。结果表明:6月份所采集的印楝叶片其养分含量与印楝产量之间存在显著线性相关;获得印楝高产的叶片全N、全P和全K的临界值分别为15.09、1.22和7.68g·kg-1,相应的最适范围分别为15.09～22.68、1.22～1.59和7.68～9.17g·kg-1;低产印楝人工林的叶片养分的DRIS图解法和DRIS指数法诊断结果基本一致,它们对N、P、K的需求次序均为P>N>K,并且这一结果与当地土壤本底肥分检测结果相印证。此外,叶片养分含量与印楝素含量之间不存在相关性,可能与印楝素本身的遗传因素有关,故不能在印楝实生群体中采用叶片营养诊断技术来进行种仁印楝素含量的诊断分析。
By using the foliar nutrient diagnosis methods such as critical concentration value approach （CCVA）, graph diagnosis and recommendation integrated system （DRIS）, and index DRIS, this paper studied the relationships between the seed yield and its azadirachtin content and the foliar nutrient contents of seeding Azadirachta indica plantations in Yuanmou dry-hot valley. There existed significant linear correlations between the nutrient contents of foliages collected in June and the seed yield. In high-yielding plantations, the optimal contents of foliar total N, total P, and total K were 15.09-22.68, 1.22-1.59, and 7.68-9.17 g＆middot;kg-1, and the critical values were 15.09, 1.22, and 7.68 g＆middot;kg-1, respectively. In low-yielding plantations, the nutrient diagnosis results from graph and index DRIS were identical, i.e., the nutrient requirement was P〉N〉K, which fitted with the background data of the nutrient contents in local soils. There were no correlations between the foliar nutrient contents and seed azadirachtin content, which was possibly due to the genetic factors of A. indica itself. Therefore, foliar nutrient diagnosis test could be not appropriate for measuring the seed azadirachtin content of A. indica seeding plantations.
出处
《生态学杂志》
CAS
CSCD
北大核心
2013年第8期1959-1966,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31270710)
国家科技支撑项目(2012BAD21B04)资助
关键词
印楝
营养诊断
产量
印楝素含量
Azadirachta indica
nutritional diagnosis
yield
azadirachtin content
