葉ye麵mian積ji是shi影ying響xiang植zhi物wu光guang合he作zuo用yong效xiao果guo的de主zhu要yao因yin素su
，同tong時shi它ta與yu植zhi物wu氮dan含han量liang存cun在zai一yi定ding的de關guan聯lian性xing。葉ye麵mian積ji作zuo為wei植zhi物wu生sheng長chang發fa育yu與yu生sheng理li生sheng態tai的de主zhu要yao標biao準zhun
，也ye是shi植zhi物wu種zhong植zhi、遺(yi)傳(chuan)育(yu)種(zhong)時(shi)必(bi)須(xu)考(kao)慮(lv)的(de)因(yin)素(su)。因(yin)此(ci)對(dui)葉(ye)麵(mian)積(ji)進(jin)行(xing)快(kuai)速(su)準(zhun)確(que)的(de)測(ce)量(liang)能(neng)夠(gou)了(le)解(jie)植(zhi)物(wu)的(de)生(sheng)長(chang)發(fa)育(yu)的(de)情(qing)況(kuang)。葉(ye)麵(mian)積(ji)測(ce)量(liang)方(fang)法(fa)有(you)很(hen)多(duo)種(zhong)，我(wo)們(men)可(ke)以(yi)簡(jian)單(dan)的(de)將(jiang)其(qi)分(fen)為(wei)無(wu)傷(shang)測(ce)量(liang)與(yu)有(you)傷(shang)測(ce)量(liang)這(zhe)兩(liang)種(zhong)，其(qi)中(zhong)無(wu)傷(shang)測(ce)量(liang)對(dui)植(zhi)物(wu)影(ying)響(xiang)較(jiao)小(xiao)。手持葉麵積儀就是無傷測量葉麵積的一種儀器，它具有方便攜帶、使用簡單、性能可靠、測量精度高、成本低等優點。

　　手持葉麵積儀在測定的過程中是利用雙晶矽光電感應板和平麵發光板構成檢測係統
，采用標準計算法和儀器實際所測得的各項參數建立BP神經網絡模型，通過模型運算得出被測葉片麵積。葉麵積測量儀的感光板尺寸為245 mm×350mm，均jun勻yun發fa光guang板ban與yu多duo晶jing矽gui光guang電dian傳chuan感gan器qi相xiang對dui
，在zai進jin行xing測ce定ding的de過guo程cheng中zhong隻zhi需xu將jiang葉ye片pian放fang置zhi於yu該gai感gan光guang板ban中zhong既ji可ke。多duo晶jing矽gui光guang電dian感gan應ying板ban在zai光guang源yuan照zhao射she下xia產chan生sheng一yi定ding的de感gan應ying電dian壓ya，當dang夾jia入ru植zhi物wu葉ye片pian時shi
，葉ye片pian將jiang部bu分fen照zhao射she光guang線xian遮zhe擋dang

，光guang電dian感gan應ying板ban的de感gan應ying電dian壓ya也ye隨sui之zhi變bian化hua，利li用yong擋dang光guang程cheng度du與yu光guang電dian感gan應ying電dian壓ya值zhi的de大da小xiao關guan係xi計ji算suan被bei測ce葉ye麵mian積ji大da小xiao。

　　但由於光源針對不同種類、不同厚度、butongyansedezhiwuyepiantouguanglvbutong，qieduojingguiguangdianganyingbandeguangdianxiaoyingyuwenduyecunzaiyidingguanxi，yinci，yaoliyongshangshuyuanlizhunqueceliangzhiwuyepianmianji，bixukaolvdaoguangyuanduiyepiandetoushelvyuceliangshiduojingguiguangdianganyingbandewenduxishu。weilekefushangshuyinsudeyingxiang，jiangshouchiyemianjiyizhongdeduogeguangzhaochuanganqiyijiwenduchuanganqijinxingqiaomiaodichuli，jiangshangshucanshutongguochuanganqijiancehouzuoweibianliangzhiyumoxingzhong
，tongguojianlirengongshenjingwangluomoxingkefugeyinsuduiceliangjieguodeganyu。

　　shouchiyemianjiyishizhenduirenhebuguizexingzhuang，renheyanse
，renhehouduheshuifenhanliangdeyepianbiaomianjijinxingceliang。taduiyepianjihumeiyourenheyaoqiu
，wulunduodadeyepian，doukeyiceliang，rubajiaoyepian，yepianchangyuanxing，chang2-3m，寬25-30cm，如ru此ci巨ju大da的de葉ye片pian，隻zhi需xu將jiang其qi切qie割ge成cheng小xiao葉ye片pian
，然ran後hou再zai單dan獨du對dui每mei片pian葉ye片pian進jin行xing測ce定ding。我wo們men可ke以yi通tong過guo葉ye麵mian積ji的de測ce量liang來lai進jin行xing了le解jie一yi些xie其qi他ta的de因yin素su。可ke以yi通tong過guo活huo體ti葉ye麵mian積ji儀yi來lai進jin行xing計ji算suan葉ye麵mian積ji指zhi數shu，而er葉ye麵mian積ji指zhi數shu是shi反fan映ying作zuo物wu群qun體ti大da小xiao的de較jiao好hao的de動dong態tai指zhi標biao
，跟gen作zuo物wu產chan量liang有you一yi定ding的de關guan係xi。

　　jiandanlaishuo，yemianjiyuedadezhiwuqiguanghezuoyongjiubiyemianjixiaodezhiwuxiaolvgao
，xiangduieryanjiuyaoshengchangdehaoyidian，yinci

，duiyuzuowudeshengchangzhuangkuangyanjiu，womenjingchangxuyaozhidaoyemianjizhishuzheyicanshu。tongshiwomenyekeyicongyemianjidebiaomianyanselaijinxinglejieturangzhongdeyingyangyuansudequeshiwenti。