凡事都有個度，欠了、guoledoubuxing


，zainongyezhongzhiguochengzhongyeyiyang。jiunaguoshulaishuo，guoshuyepianguoduoguoshaodoubuxing，yibanlaishuo，guoshuyepianshuliangdeduoshaokeyitongguoyemianjizhishulaihengliang。tongchangqingkuangxia，yemianjizhishuzai3~5的範圍比較適合，過高或過低都對生產不利。那麼葉麵積應該如何有效測量呢？現如今多數研究人員會利用手持葉麵積儀進行測量，然後通過公式換算葉麵積係數。

    果樹葉片是樹體光合生產的基礎。生產中，常將葉片的形態結構

、mianjidaxiaojiqibianhuadongtaizuoweizhidingzaipeijishudezhongyaoyiju。kexueyanjiuzhong，yechangbayepianzhibiaozuoweiyixiangzhuyaocanshu。zaizhongzhiyichuanyinzidekongzhixia
，meizhongguoshudeyepianxingtaitezhengjuyouxiangduidetongyixinghewendingxing。tongzhongguoshusuiyinzaibutongshenglinianlingshiqihuozaishuguanzhitiaoshangdebutongzheshengbuwei、或在不同管理水平下麵積大小差異較大
，但葉片的基本形態是比較接近的。
    一般果樹葉麵積指數為3到5比bi較jiao適shi宜yi。如ru果guo葉ye片pian過guo多duo，單dan個ge葉ye片pian受shou光guang不bu足zu，光guang合he作zuo用yong就jiu受shou到dao限xian製zhi。遮zhe光guang嚴yan重zhong的de葉ye片pian本ben身shen沒mei有you光guang合he能neng力li也ye罷ba

，但dan是shi葉ye片pian要yao生sheng存cun，就jiu需xu要yao消xiao耗hao養yang分fen，樹shu上shang的de葉ye片pian一yi旦dan超chao過guo葉ye麵mian積ji係xi數shu5，無效葉片就大量增加
，“光吃飯不幹活”，對樹體反而是一種傷害。