Changes of Cultivate Land Pressure and Grain Product in Tongliang County of Chongqing

Change analysis of cultivated land pressure and grain product on self-sufficiency area county has great significance for the cultivated land protection and rational utilization.Tongliang county，the typical low hilly land of Chongqing，was took as study area.Change of cultivated land pressure and grain product from 2002 to 2011 was analyzed.Results showed that agriculture land was given priority in study area，and arable land accounts for major than other in agricultural land.The cultivated land showed a trend of concentration distribution，and the little gradient cultivated land was mainly distributed in the middle to lower part，but the northern had the bigger gradient.Arable land and per capita cultivated land had presented reduced overall in 10 years，but multi-cropping index was increased，and land reclamation rate was slightly lower.Main food crop yield were increased，and the total grain output and per capita amount of grain were present decreased after increased in 10 years.The change of cultivated land pressure index was diversity in 10 years，cultivated land pressure was more noticeable，and cultivated land resource was in the tight state.The cultivated land pressure will decrease in the future，and stress state of cultivated land resource will be eased.