GLYCIM模式介紹-植物參數

GLYCIM模式最早在1982由Dr. Acock等人建立，經過Dr. V.R. Reddy, Dr. Yakov Pachevsky, Dr. Dennis Timlin 等人測試與修訂，根據Dr. Reddy口述，Ken Boote最早也有參與GLYCIM模式開發，後來依據GLYCIM模式的基礎建立CROPGRO模式，因此CROPCRO與GLYCIM模式有一定的相似度。原本的GLYCIM模式使用Penman monteith進行水平衡模擬、Hyperbolic equation模擬光合作用，該模式相當令人驚豔之處在於能夠反映淹水情境下，根部活性降低、生長速率下降與根瘤死亡，可以從上述的現象探討淹水情境下，大豆的生理變化以及元素平衡，對於最終產量的影響。
Dr. Timlin在20年以前就開始協助GLYCIM模式土壤模型的建立，這幾年重新將GLYCIM模式與2DSOIL結合成為2DGLYCIM，並且使用FvCB取代Hyperbolic equation進行光合作用模擬，可想像是另一個昇級版的大豆模式。目前模式的原始碼仍然是公開的，只要有興趣的人都可以在Github上找到GLYCIM，Dr. Reddy的團隊一直歡迎大家取用模式，這個氣度永遠是我無法企及的。
GLYCIM模式所需的作物參數檔下表，可以看到參數檔當中有相當大的部分用來模擬作物的發育，模式的時步(time step)是小時，在這個模式既可以觀察到Dr. Acock盡量使用生長/發育速率的取代累積溫度，很大的程度影響到MAIZSIM模式。GLYCIM模式假設的基礎溫度是0℃，並無optimum temperature，值得觀察高溫環境下是否能使用beta function來取代現行的linear equation。

代碼	Definition	定義	備註
MG	maturity group number (group 00 = 1)	成熟群
SEEDLB	number of seeds per pound weight typical for cultivar	每磅籽粒數	Sink
FILL	Seed fill rate mg seed day-1 (24oC)	24oC大豆充實速率 (mg seed-1day-1)	Sink
DET	Determinancy of cultivar	有限生長/無限生長
PARM1	correction to Pennman equation (usually 1.0)	Pennman equation係數
PARM2	slope of the dependence of VSTAGE on temperature integral, dday-1	主幹節數增加的速率(1/積溫)	Development
PARM3	maximum VSTAGE	主幹最大節數	Development
PARM4	correction factor for the early V rate to account for clay content		Development
PARM5	Progress rate towards R0 at solstice, day-1	(夏至時173DOY)至R0的生育期變化進程(1/發芽至R0日數)	Development
PARM6	daily rate of the progress to R0 before solstice, day-1	(夏至前173DOY)至R0的生育期變化進程(1/發芽至R0日數)	Development
PARM7	daily rate of the progress to R0 after solstice, day-1	(夏至後173DOY)至R0的生育期變化進程(1/發芽至R0日數)	Development
PARM8	progress rate from R0 towards R2, day-1	R0至R2生育期變化進程(1/日數)	Development
PARM9	slope of the dependence of R2end on the JDFRST (emergence date), day-1		Development
PARM10	intercept of the dependence of R2end on the JDFRST (emergence date), day-1		Development
PARM11	progress rate from R2 towards R6, dday-1	R2至R6生育期變化進程(1/積溫)	Development
PARM12	length of the plateau R5, dday-1	R5的持續時間 (積溫)	Development
PARM13	length of the plateau R6 with no stress, dday-1	沒有逆境下R6的持續時間 (積溫)	Development
PARM14	rate of the decay of the R6 plateau as the stress increases, dday-1	逆境影響R6的程度 (積溫)	Development
PARM15	rate of the progress towards R7, dday-1	至R7stage進程(1/積溫)	Development
PARM16	R stage to stop vegetative growth	葉片停止生長時的R stage	Growth
PARM17	Potential elongation / dry weight increase of petioles	葉柄增加長度/葉柄增加重量	Sink
PARM18	Potential rate of the root weight increase	根重增加速率	Sink
PARM19	Increase in pod weight / progress in R stages	豆莢增加重量/每增加一R stage	Sink
PARM20	relates increase in seed weight and FILL	豆莢增加重量/每增加一R stage	Sink
PARM21	a in relationship between height and V stages “a” in the dependence (h=a*v^b) between height and V stages	(株高的參數)	Morphology
PARM22	b in relationship between height and V stages “a” in the dependence (h=a*v^b) between height and V stages	(株高的參數)	Morphology
PARM23	Number of branches / plant density	分支數量/栽植密度	Morphology
PARM24	Stem weight / stem elongation	主幹重量/主幹增加長度	Sink
PARM25	Increment in leaf area / increment in vegetable stages	每一個V stage增加之葉面積	Morphology

參考文獻 1. Reddy, V. Allometric Relationships in Field-grown Soybean. Annals of Botany 1998, 82, 125-131, doi:10.1006/anbo.1998.0650. 2. Haskett, J.D.; Pachepsky, Y.A.; Acock, B. Estimation of soybean yields at county and state levels using GLYCIM: A case study for Iowa. Agronomy Journal 1995, 87, 926-931.