Suitability evaluation and layout rationality analysis of on cultivated land in the Yarlung Zangbo River,Nyangqu River and Lhasa River Region,Xizang
In view of the practical significance to master the cultivated land suitability efficiently and accurately for agricultural policy formulation and agricultural standardized management,twelve evaluation factors included in the five aspects of terrain,climate,location,soil and land use conditions were selected to evaluate the cultivated land suitability by using the weighted exponential sum method,restriction factor method and analytic hierarchy process in this paper,which were based on the actual situation of Yarlung Zangbo River,Nyangqu River and Lhasa River Region,Xizang.On this basis,through analyzing the layout rationality of cultivated land in 2021,the corresponding suggestions for optimizing cultivated land were put forward.The results showed that:1)Limited by geographical location,elevation and other factors,the overall suitability of cultivated land in the research area was general,there were 10 737.57 km2 highly suitable cultivated land,accounted for 4.18％of total cultivated land.The moderately suitable area accounted for 3.54％,the marginally suitable area accounted for 8.16％,the proportion of unsuitable cultivated land was the highest,accounted for 84.12％.2)The highly suitable cultivated land were mainly located in middle and lower reaches of Yarlung Zangbo River,Nyangqu River and Lhasa River.From the perspective of administrative division,specifically distributed in Shigatse,Nyingchi City,Lhasa City and Shannan City.3)The cultivated land of 2021 was mainly highly suitable and moderately suitable,there were 2 694.06 km2 cultivated land of moderately suitable and above standards,accounted for 82.27％of total cultivated land.On the whole,the suitability of current cultivated land in the study area was higher,the layout of cultivated land was reasonable.
cultivated land suitability evaluationevaluation factorslayout rationality
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NSTL
万方数据
