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对９个不同施肥处理的连栽地杉木针叶的叶片质量和单叶面积进行了研究。结果表明，各施肥处理叶片质量均下降，含磷素的配合施肥，如氮磷钾加微量元素、磷钾配施、氮磷钾配施和氮磷配施等能提高杉木针叶的单叶面积，微量元素与氮磷钾混施的效果尤佳。同时，指出施肥能改善针叶光合作用的有效叶面积，认为有效叶面积比叶片质量、单叶面积与杉木材积生长的相关关系更为密切。表５参３
The leaf quality and single leaf area of nine continuous-growing fir needles with different fertilizer treatments were studied. The results showed that the quality of leaves of all the fertilization treatments decreased. The combined application of phosphorus fertilizers, such as NPK plus trace elements, phosphorus and potassium fertilization, NPK and nitrogen and phosphorus fertilization, Area, trace elements and NPK mixed effect is particularly preferred. At the same time, it is pointed out that fertilization can improve the effective leaf area of needle and leaf photosynthesis. It is concluded that the effective leaf area is more closely related to leaf mass, leaf area and fir volume growth. Table 5 reference 3