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Systemac Concept and Dcvelopment Model for the Production Base of Gynostemma pentaphyllum(Thunb.)Madino The early warning system of environmental quality in production base of green food supported by GIS—A case study from the national ecological agriculture demonstration area in Qing’an County，Heilongjiang Province Study on status,developing trend，and the distribution of production base of special maize in Jilin Province Growth and Evaluation of Almond-Apricot in Baiyushan Hilly Area