植物冠(guan)層分析儀利用魚眼(yan)鏡頭(tou)和CCD圖(tu)(tu)像傳感器來獲取植物冠(guan)層圖(tu)(tu)像。通過(guo)專業軟(ruan)件分析,獲得(de)植物冠(guan)層的(de)葉(xie)面(mian)積指(zhi)數(LAI)和冠(guan)層其它的(de)參數;自動(dong)水平數字相機獲取150°的(de)冠(guan)層圖(tu)(tu)像,手柄上24個PAR傳感器測(ce)量光(guang)合有(you)效(xiao)輻射并(bing)計算光(guang)斑。圖(tu)(tu)像法(fa)測(ce)量植物冠(guan)層,僅僅獲取一次冠層圖像即(ji)可(ke),簡化了傳統能量(liang)法要(yao)一天定點多次測量(liang)的繁(fan)復工作;同時(shi)可以(yi)躲開障礙物,選擇(ze)合適測量(liang)點。
主要功能(neng)
? 測(ce)量冠層葉面積指數(LAI),光(guang)合有效輻射值,計(ji)算(suan)太陽光(guang)斑
? 可調節鏡(jing)頭聚焦適合(he)不同高度(du)的冠層測量,從低矮植物到林木均可使用
? 鏡頭自動水平,一(yi)次(ci)成(cheng)像,測量不(bu)受天氣(qi)、光(guang)線影響(xiang),無需天空(kong)空(kong)白對(dui)照測量
? 無需(xu)在冠層頂(ding)部(bu)做參照測量(liang)
? 現(xian)場獲取植(zhi)物冠層彩色圖(tu)像,并直接(jie)(jie)顯示和儲存,強(qiang)大的(de)(de)冠層分析軟件功能,可以手(shou)動調節閾(yu)(yu)值、自(zi)動調節閾(yu)(yu)值(OTSU),現(xian)場評估冠層內(nei)的(de)(de)太陽直接(jie)(jie)輻(fu)射透過系(xi)數(shu)或LAI分析空隙系(xi)數(shu)。
? 軟(ruan)件設置天頂角和(he)方位角
? 用戶(hu)可(ke)通(tong)過分析軟(ruan)件進(jin)行(xing)天空(kong)和葉片進(jin)行(xing)顏色過濾
? 通(tong)過GPS和羅盤功能(neng)方(fang)便定位(wei),在(zai)植物生(sheng)長季過程定點(dian)重復測量
? 軟件(jian)進行屏蔽(bi)、躲(duo)開(kai)影(ying)響圖像計(ji)算(suan)結(jie)果的人影(ying)、天空等無用圖像
測量參數
? 植物冠層葉面(mian)積指數(LAI)
? 葉片平均傾角(MLA)
? 散射(she)輻射(she)透過率(lv)(Transmission Coefficient)
? 消光(guang)系數(shu)(Extinction Coefficient)、直接輻(fu)射透過系數(shu)(Transmission Coefficient)、葉片分布(Leaf Distribution)
? GPS定位信息(GPS Lock)
? 太陽(yang)光斑(Sunflecks)、光合(he)有效輻(fu)射(PAR)
應(ying)用領域
廣泛應用農業(ye)科學、林(lin)木(mu)(mu)(mu)科學和植物(wu)結(jie)構分析等方面(mian),研究植物(wu)葉面(mian)積指數與(yu)生(sheng)產關系、林(lin)木(mu)(mu)(mu)的冠層指標、農作(zuo)物(wu)和林(lin)木(mu)(mu)(mu)的生(sheng)長監測;林(lin)木(mu)(mu)(mu)內的光合有效輻射強(qiang)度;對不同緯(wei)度林(lin)木(mu)(mu)(mu)的葉面(mian)積指數的變化,環境對植物(wu)觀(guan)察的影響,田間農作(zuo)物(wu)、樹林(lin)及低(di)矮植物(wu)冠層測量
主要(yao)技(ji)術參數
? 鏡頭(tou)(tou)視角:150°廣角鏡頭(tou)(tou)
? 相機分辨:800萬(wan)像素(su),
? 交互(hu)界(jie)面:7”觸屏,6按鍵(jian)
? 測量時間:0.5 s
? 冠層分(fen)區:天頂角(jiao)劃分(fen)1~10;方位(wei)角(jiao)劃分(fen)1~10
? 圖像(xiang)分析(xi):可對冠層圖進(jin)行(xing)調節、數據(ju)分析(xi)和編(bian)輯
? 工作環境:5-50℃, 0-100% RH(不(bu)結(jie)露)
? 操作桿:400mm
? PAR傳感器:24個
? 附加(jia)功能:GPS數據顯示
? 供電:>6小(xiao)時
選購指南
手柄、魚(yu)眼鏡(jing)頭、操作說明、軟件和便攜式手提箱
林(lin)地測(ce)量模式
產地(di):美國(guo)CID
參考文獻
原始數據來源:Google Scholar
1.Ziany N. Brand?o & Jo?o H. Zonta(2016)Hemispherical photography to estimate biophysical variables of cotton,Revista Brasileira de Engenharia Agrícola e Ambiental,10.1590/1807-1929
2.Jarrah Wills, John Herbohn, Maria Opelia Maranguit Moreno, Mayet S. Avela, Jennifer Firn,(2016)Next-generation tropical forests: reforestation type affects recruitment of species and functional diversity in a human-dominated landscape Authors,Journal of Applied Ecology 10.1111/1365-2664.12770
3.Long-Fei Chena, Zhi-Bin Hea, Xi Zhua, Jun Dua, Jun-Jun Yanga, Jing Lia(2016)Impacts of afforestation on plant diversity, soil properties, and soil organic carbon storage in a semi-arid grassland of northwestern China,CATENA 10.1016/j.catena.2016.07.009
4.Adil Enis Arslan, Esra Erten, Muhittin ?nan(2016) Application of Geodetic Projections to Terrestrial Laser Scanning in Leaf Area Index calculation,Signal Processing and Communication Application Conference 10.1109/SIU.2016.7495900
5.Prahlad, V.C.(2016)Studies on Canopy Distribution, Stand Growth and Regeneration in Cedrus deodara (Roxb.) Loud Under Temperate Conditions of Himachal Pradesh,Thesis for the Dr. Y.S. Parmar University of Horticulture & Forestry, Solan
6.Junaid N. Khan; A. K. Jain; Vijay P. Singh, F.ASCE; R. Kumar; R. Sharda; and M. Siag(2016)Simulation of Mulch and No-Mulch Conditions for Various Soil Matric Potential Thresholds for Drip-Fertigated Guava (Psidium guajava L.) in the Semiarid Region of Northwest India Journal of Irrigation and Drainage Engineering 10.1061/(ASCE)IR.1943-4774.0001047
7.Shi De-yang, Li Yan-hong, Zhang Ji-wang, Liu Peng, Zhao Bin, Dong Shu-ting(2016)Increased plant density and reduced N rate lead to more grain yield and higher resource utilization in summer maize,Journal of Integrative Agriculture 10.1016/S2095-3119(16)61355-2
8.Davi Rodrigo Rossatto, Everlon Cid Rigobelo(2016)Tree encroachment into savannas alters soil microbiological and chemical properties facilitating forest expansion,Journal of Forestry Research 10.1007/s11676-016-0219-0
9.Assal, T., Anderson, P., Sibold, J.(2016)Spatial and temporal trends of drought effects in a heterogeneous semi-arid forest ecosystem,Forest Ecology and Management, 365 (137-151). 10.1016/j.foreco.2016.01.017