Comprehensive Early Warning System of Cultivated Land Protection in Xinxiang City

In order to establish integrated early warning system of cultivated land protection based on cultivated land quantity，quality and productivity，the early warning of regional cultivated land comprehensive protection status was carried out.The negative number principle method was used to divide warning threshold.Various models were established to calculate the cultivated land quality and productivity changes caused by various reasons.Several results have been developed.Firstly，the change of cultivated land quantity has different influence on the quality and productivity of cultivated land.Secondly，affected by different causes of cultivated land quality change，the change of cultivated land quality and productivity was not proportional to each other.Cultivated land productivity could better reflect health status of regional cultivated land protection.Thirdly，the construction of cultivated land quality could improve quality and productivity of cultivated land when quantity cannot be balanced.Fourthly，the analyses of early warning results and causes of cultivated land could provide more targeted measures for regional cultivated land protection.In conclusion，the integrated early warning system of cultivated land protection could give scientific early warning on status of regional cultivated land protection.