杉木人工林施肥试验研究

Fertilization Trials on Plantations of Chinese Fir in Sichuan

从１９８６年起至１９９２年在我省珙县和纳溪进行了杉木人工林施肥试验。试验处理包括施肥种类（Ｎ、Ｐ及Ｎ＋Ｐ）和施肥剂量。以胸径生长量、树高生长量和材积生长量为指标分析了施肥效果；采用线性模型进行了统计检验。试验结果表明，合理的施肥措施（例如施适量氮磷复合肥）对杉木生长有明显增益作用，可以获得显著经济效益，其增益产值与投入现值之比在２以上，最高可达７；平均年增益产值为３００元／ｈａ──９００元／ｈａ。

From 1986 to 1992,fertilization trials on plantations of Chinese fir were carried out in Sichuan. The experiment treatments consist of types of fertilizer (N,P and N+P) with the correspondins dosages.For identifying and evaluatinS the responses to various treatments,in terms of increments of averase diameter average height and average volume,the linear model was employed.The statistical analyses based on 6-year experiment data indicated that with proper fertilhation treatments,growth of young plantations of Chinese fir was accelerated,as a result,sisnificant economic benifit was obtained:a ratio of gain in value to discounted value of input was at least 2with a maximum of 7,while the annual sam in values ranges 300 yuan/ha to 900 yuan/ha.