پارامتريابي و ارزيابي مدل DSSAT/CANEGRO براي نيشكر رقم CP57-614 در شرايط اقليمي خوزستان

Parameterization and Evaluation of the DSSAT-CANEGRO Model for Sugarcane CP57-614 in Khuzestan Climate Condition

ﻫﺪف از اﯾﻦ ﭘﮋوﻫﺶ واﺳﻨﺠﯽ ﻣﺪل DSSAT/CANEGRO ﺑﺎ اﺳﺘﻔﺎده از دادهﻫﺎي دو ﮐﺸﺖ از رﻗﻢ CP57-614 در ﮐﺸﺖ و ﺻﻨﻌﺖ ﻧﯿﺸﮑﺮ اﻣﯿﺮﮐﺒﯿﺮ ﺧﻮزﺳﺘﺎن و ارزﯾﺎﺑﯽ آن ﺑﺮاي ﺳﻄﻮح ﻣﺨﺘﻠﻒ آﺑﯿﺎري اﺳﺖ. ﻃﺮح آزﻣﺎﯾﺸﯽ اﺟﺮا ﺷﺪه در ﺳﺎلﻫﺎي زراﻋﯽ 86-85 و 95-94 در ﺳﻪ ﺳﻄﺢ آﺑﯿﺎري ﺷﺎﻣﻞ دو ﺳﻄﺢ ﺗﻨﺶ آﺑﯽ و ﯾﮏ ﺳﻄﺢ آﺑﯿﺎري ﮐﺎﻣﻞ در ﺳﻪ ﺗﮑﺮار در ﻗﺎﻟﺐ ﻃﺮح ﺑﻠﻮكﻫﺎي ﮐﺎﻣﻞ ﺗﺼﺎدﻓﯽ اﺟﺮا ﮔﺮدﯾﺪه اﺳﺖ. ﺑﻪﻣﻨﻈﻮر دﺳﺖﯾﺎﺑﯽ ﺑﻪ ﺑﺮﺧﯽ ﺿﺮاﯾﺐ ورودي، اﺑﺘﺪا واﺳﻨﺠﯽ ﻣﺪل ﺑﺎ روش GLUE اﻧﺠﺎم ﺷﺪ. ﻣﺪل CANEGRO داراي 20 ﭘﺎراﻣﺘﺮ ژﻧﺘﯿﮑﯽ ﻣﯽﺑﺎﺷﺪ ﮐﻪ ﺑﻪﻣﻨﻈﻮر ﮐﺎﻫﺶ ﺗﻌﺪاد آنﻫﺎ، ﭘﺎراﻣﺘﺮﯾﺎﺑﯽ اﻧﺠﺎم ﺷﺪ. ﻣﻘﺎﯾﺴﻪ ﭘﯿﺶﺑﯿﻨﯽﻫﺎ و ﺷﺒﯿﻪﺳﺎزيﻫﺎي ﻣﺪل ﻧﺸﺎن داد ﮐﻪ راﻧﺪﻣﺎن ﻣﺪل ﺑﺮاي وزن ﺧﺸﮏ ﻫﻮاﯾﯽ ﺑﺮاﺑﺮ ﺑﺎ 0/69 ﺗﺎ 0/75، وزن ﺧﺸﮏ ﺳﺎﻗﻪ ﺑﺮاﺑﺮ ﺑﺎ 0/67 ﺗﺎ 0/7 و ﺳﺎﮐﺎرز ﺑﺮاﺑﺮ ﺑﺎ 0/18 ﺗﺎ 0/25 اﺳﺖ. دﻗﺖ ﻣﺪل در ﭘﯿﺶﺑﯿﻨﯽ ﺳﺎﮐﺎرز ﻧﺴﺒﺖ ﺑﻪ ﺑﻘﯿﻪ ﻣﺘﻐﯿﺮﻫﺎ ﮐﻤﺘﺮ ﺑﻮد ﮐﻪ ﺑﻪ ﺳﺒﺐ اﻧﺪازهﮔﯿﺮيﻫﺎي ﺳﺎﮐﺎرز در اواﺧﺮ ﻓﺼﻞ اﺳﺖ.

The purpose of this study was to calibrate and evaluate DSSAT-CANEGRO Model using field data from two datasets for cultivar CP57-614, in Khuzestan. The experimental plan was performed at three levels of irrigation water (full and deficit irrigation) with three replicates in a completely randomized block design during cultivation years of 85-86 and 94-95. First of all, model calibration was done to find out the important input parameters by GLUE method. DSSAT-CANEGRO Model consists of 20 Genetic parameters. In order to reduce some parameters, parameterization was conducted using field data. The comparison between predicted and measured data showed that the model efficiency was 0.69 to 0.75 for aerial dry mass, 0.67 to 0.7 for stalk dry mass and 0.18 to 0.25 for sucrose. The results indicated that the sucrose prediction by CANEGRO model is weak as compared to other parameters. This is due to measuring sucrose at the end of grown season.