| Land resource quality in the cross area of agriculture and ranch in northern Shaanxi was evaluated using APH(Analytic Hierarchy Process) method,in which climate factors included annual average precipitation,≥10℃ accumulate temperature,annual average temperature,average sunshine time,and time without frost,landform factors included altitude and landform type,soil factor include soil texture,soil alkali N,soil quick-acting K,soil quick-acting P,soil total N,soil organic matter.The results show that: the climate conditions on the research region were changing worse from southeast to northwest,climate in Jiaxian is the best, in Jinbbian is the worst;soil on the north Great wall is bad,soil on the south Great wall changes better;evaluating on the total,first and second grade land were less,238 km2 which accounts for 0.7% of the research area,third grade land 4 143 km2 accounts for 11.4%,fourth grade land 10 997 km2 accounts for 30.4%,fifth grade land 9 254 km2 accounts for 25.6%,sixth grade land 8 105 km2 accounts for 22.4%,seventh grade land 3 372 km2 accounts for 9.3%;first and second grade land are mainly distributed on the bank and shoals alone the river Kuye,Tuwei,Jialu,and Yuxi,third and fourth grade land are mainly distributed ridge,tableland and hill of loss plateau,and river bank,fifth grade land is distributed in the ridge of loss plateau and fixed sand area alone the great wall,sixth and seventh grade land are located in sand hill,semi-fixed sand and fixed sand areas. |