| Layout sampling for cultivated land monitoring based on restricted types and spatial heterogeneity |
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| DOI：10.7606/j.issn.1000-7601.2017.05.20 |
| Key Words: land use monitoring sites semivariogram function cultivated land type optimal layout |
| Author Name | Affiliation | | MA Yan | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Ying | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LU Zheng | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| The quantity and quality of cultivated land plays an important role in ensuring food security and maintaining social stability, monitoring the existing cultivated land quality change has a strategic significance for cultivated land
resource security. The samples establishment method of cultivated land monitoring in a county scale was explored with a example of Wushan County. Choosing four main factors affecting the quality of cultivated land and limit coefficients were calculated, cultivated land was divided into 6 limit types according to the high-low scale of limit coefficients; semi-variogram function was used to analyze the variability of national natural grade index and 44 monitoring samples were found based on farmland limit types division. Kriging method validation showed that the samples laid accurate and reliable to meet the monitoring requirements. This method greatly improved the representativeness and accuracy of the samples, and provides a reference for farmland quality monitoring management and implementation. |
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