SMCR_N模型在北京地区潮土茄田适用性分析

doi:10.3969/j.issn.1673-503X.2016.04.014

Abstract

Abstract: To provide a reference for regional application of SMCR_N (Simulation Model for Crop Response to Nitrogen fertilizer) model in alluvial region of Beijing,it has been used to simulate the yields of purple long- and round-eggplants as well as the amount of N uptake by round-eggplants using the location experiment,meteorological and cultivating management data in the eggplant field with alluvial soil in Beijing from 2009 to 2010.The parameters of the model were calibrated using data from this experiment.The performance of the model was evaluated with experimental data as well.The results show that the original eggplant parameters in SMCR_N model can be directly applied to simulate the yield of purple long-eggplants growing in alluvial region of Beijing.The simulating results indicate that RMSE (Root Mean Square Error),n-RMSE(normalized Root Mean Square Error),EF (model prediction Efficiency),E,d (fitting index),and R² (determination coefficient) are 0.42 t·hm^-2,0.06 t·hm^-2,0.95,0.40,0.99,0.96,respectively.The cultivar of round-eggplant used in the location experiment is different from that in SMCR_N model.So,the corresponding parameters in SMCR_N model need to be adjusted.The sensitivity analyses show that simulation results are sensitive to crop growth parameter (K₁).When K₁ is adjusted to 1.4,the simulating result of dry weight is more accurate,with RMSE,n-RMSE,EF,E,d,R² of 1.2 t·hm^-2,0.12 t·hm^-2,0.59,0.76,0.93,0.80,respectively.After calibrating model parameters,the SMCR_N model can be also used to simulate the N uptake by round-eggplants.The simulating results are satisfactory,with R² of 0.85.In conclusion,the variations of total dry weight and N uptake by eggplants in alluvial region of Beijing can be well simulated through calibrating the parameters in SMCR_N model.The SMCR_N model can be applied to guide a reasonable fertilization for eggplant fields in alluvial region of Beijing.

Key words: SMCR_N model, Alluvial region, Eggplant field, Applicability, Sensitivity

CLC Number:

Q141/S641.1

DONG Yi-wei, LI Yu-zhong, ZHANG Ke-feng, XU Chun-ying, LI Qiao-zhen, FANG Fu-li, GUO Zhi-cheng. Applicability analysis of SMCR_N model for eggplant growing in alluvial region of Beijing[J]. Journal of Meteorology and Environment, 2016, 32(4): 106-112.

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Applicability analysis of SMCR_N model for eggplant growing in alluvial region of Beijing

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