Spatial Distribution Pattern on Cultivated Land Influenced by Flood Hazard in China

Flood disasters not only threat people′s life and property，also affect the safety of environment resources ecosystem.They could make destructive damage to cultivated land resources both quantity and quality.The cultivated land，once damaged，need to invest huge human，material and financial resources to restore its productivity.Based on analysis of formative factors of cultivated land influenced by flood hazard，selecting restrictive factors such as rainfall，degree of relief floods occurred frequently，membership degree and drainage system （including rivers and lakes），it combined with the comprehensive evaluation method and put forward the corresponding countermeasures.The spatial distribution pattern on cultivated land influenced by flood hazard was studied in China.The risk of cultivated land influenced by flood hazard in China was divided into high risk，moderate risk and light risk level three classes and nine subclasses.The results showed that high danger class covered an area of 194 400 km2，accounting for 15.13% of the arable land，seven river basin were mainly distributed in China′s coast and the southwest Yunnan-Kweichow Plateau.Moderate danger class covered an area of 407 400 km2，accounting for 31.71% of the arable land area，mainly distributed in the southeast coastal area and loess plateau.Mild danger class covered an area of 682 900 km2，accounting for 53.16% of the arable land area，widely distributed in north China plain，Sanjiang plain and the northwest inland areas.Making a grading evaluation to water logging risk of cultivated land provided the basic theory basis for disaster prevention，disaster relief，land consolidation planning and the establishment of basic farmland construction standards.