Identification of Key Limiting Factors of Farmland Health in High-cold Oasis
The farmland of high-cold oasis is an important part of the social economy of the Qinghai Tibet Plateau and an important support for the construction of the national ecological barrier.However,under the dual stress of resource development and economic drive,the pressure of farmland health in high-cold oasis has increased rapidly.It is urgent to identify its key limiting factors and lay the foundation for the scientific protection of farmland health system.This paper takes Delingha City of Qinghai Province as the study area,based on the existing research liter-ature and the characteristics of the farmland in the study area,constructs the farmland health limiting factor system of high-cold oasis,and uses Geodetector to identify the key limiting factors.The results show that:The health of farmland in high-cold oasis is influenced by 4 dimensions:geographical environmental health background,ecological environmental health status,soil health status,and farmland utilization health level,with 15 limiting elements and 51 limiting factors.The binding force of influencing dimensions is between 0.747-4.042,limiting factors are between 0.044-2.230 and limiting elements are between 0.001-0.541.There are 11 key limiting factors for farmland health in high-cold oasis,which are from 0.224 to 0.541.The binding force sequence is:salinization degree>field slope>protection forest construction level>irrigation methods>economic benefit level>soil gravel content>wetland density>soil organic matter content>annual precipitation>soil e-rosion degree>normal groundwater level.The farmland health of high-cold oasis is facing the dual pressure of overall water resource shortage and local groundwater rise stress,as well as many threats such as increased salinization,wind erosion and difficult preservation of soil fertility.Its health status is more sensitive and fragile than that of farmland in lowland and and plain areas,so it is in urgent need of scientific and sys-tematic solutions for protection.
High-cold oasisFarmland healthThe key limiting factorsGeodetectorDelingha City,Qinghai Province
万方数据
维普
