Study on sampling design for monitoring cultivated land quality at a county scale

• Main Authors: XIE Ying-kai, YANG Hao, HU Yue-ming, LIU Zhen-hua, ZHAO Li
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2020-11-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: cultivated land quality; grades; monitoring areas; monitoring samples; conghua district
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2020/6/20200605.htm

In order to accurately grasp the spatial distribution characteristics of cultivated land quality grades, improve the efficiency of county cultivated land quality monitoring, and complete its monitoring system, in this study, Conghua District in Guangzhou City had been taken as an example, based on cultivated land quality monitoring results, soil, environmental factors and other data, studying sampling design by monitoring cultivated land quality at a county scale through spatial statistics and spatial superposition. By considering factors such as soil, landforms, land use level, land economic benefits, and gradual types of cultivated land quality, Conghua District was divided into 26 cultivated land quality monitoring areas. Based on the spatial stratified sampling principle of spatial statistics, and combined with the national standard sample plots, ditches, roads, villages, basic farmland, and other factors in the study area, the monitoring samples were adjusted spatially, and 111 monitoring samples were finally determined. The statistical test showed that the monitoring samples were highly representative in the overall cultivated land grading unit. The county-level cultivated land quality monitoring system established on this basis can provide technical support for the natural resources department's cultivated land quality monitoring and supervision.