Estimation of Grain Crop Yields after Returning the Illegal Nurseries and Orchards to Cultivated Land in the Yangtze River Delta Region
The purpose of this study is to develop a new remote sensing method to assess the area of cultivated land illegally converted to nurseries and orchards in the Yangtze River Delta region of China over the past 40 years (1980–2020), and then estimate the increase in grain yield based on this area. Our...
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MDPI AG
2022-11-01
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| Online Access: | https://www.mdpi.com/2073-445X/11/11/1993 |
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| author | Yirui Han Qinqin Pan Yuee Cao Jianhong Zhang Jiaxuan Yuan Borui Li Saiqiang Li Renfeng Ma Xu Luo Longbin Sha Xiaodong Yang |
| author_facet | Yirui Han Qinqin Pan Yuee Cao Jianhong Zhang Jiaxuan Yuan Borui Li Saiqiang Li Renfeng Ma Xu Luo Longbin Sha Xiaodong Yang |
| author_sort | Yirui Han |
| collection | DOAJ |
| description | The purpose of this study is to develop a new remote sensing method to assess the area of cultivated land illegally converted to nurseries and orchards in the Yangtze River Delta region of China over the past 40 years (1980–2020), and then estimate the increase in grain yield based on this area. Our result showed that 2.23 × 10<sup>4</sup> km<sup>2</sup> of cultivated land was reduced by 11.8% over the past 40 years. About 14,521.40 km<sup>2</sup> of cultivated land was converted to nursery and orchard from 1980 to 2020. The conversion area was unevenly distributed among different administrative regions. Zhejiang and Anhui Provinces had higher conversion rate and area than Jiangsu Province and Shanghai Municipalities. After the illegal nurseries and orchards return to cultivated land, if rotation farming mode is adopted, in which each grain crop is planted only once a year, the increased production of rice, wheat, corn, beans and tubers will reach (632.57 ± 13.08) × 10<sup>4</sup>, (0~531.05 ± 33.25) × 10<sup>4</sup>, (0~556.19 ± 30.36) × 10<sup>4</sup>, (0~249.85 ± 13.14) × 10<sup>4</sup> and (0~489.11 ± 28.14) × 10<sup>4</sup> tons at most in each year, respectively. Our results provide theoretical guidance for implementing food security policies and alleviating contradiction between grain production and rural labor shortages in the Yangtze River Delta region. |
| first_indexed | 2024-03-09T18:56:08Z |
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| issn | 2073-445X |
| language | English |
| last_indexed | 2024-03-09T18:56:08Z |
| publishDate | 2022-11-01 |
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| series | Land |
| spelling | doaj.art-ca2492970bd44a1cb55dff83ff7f231c2023-11-24T05:28:49ZengMDPI AGLand2073-445X2022-11-011111199310.3390/land11111993Estimation of Grain Crop Yields after Returning the Illegal Nurseries and Orchards to Cultivated Land in the Yangtze River Delta RegionYirui Han0Qinqin Pan1Yuee Cao2Jianhong Zhang3Jiaxuan Yuan4Borui Li5Saiqiang Li6Renfeng Ma7Xu Luo8Longbin Sha9Xiaodong Yang10Department of Geography and Spatial Information Techniques/Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo 315211, ChinaDepartment of Geography and Spatial Information Techniques/Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo 315211, ChinaSchool of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, ChinaNingbo Academy of Agricultural Sciences, Ningbo 315040, ChinaDepartment of Geography and Spatial Information Techniques/Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo 315211, ChinaCollege of Ecology and Environment, Xinjiang University, Urumqi 830046, ChinaInstitute of East China Sea, Ningbo University, Ningbo 315211, ChinaDepartment of Geography and Spatial Information Techniques/Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo 315211, ChinaDepartment of Geography and Spatial Information Techniques/Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo 315211, ChinaDepartment of Geography and Spatial Information Techniques/Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo 315211, ChinaDepartment of Geography and Spatial Information Techniques/Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo 315211, ChinaThe purpose of this study is to develop a new remote sensing method to assess the area of cultivated land illegally converted to nurseries and orchards in the Yangtze River Delta region of China over the past 40 years (1980–2020), and then estimate the increase in grain yield based on this area. Our result showed that 2.23 × 10<sup>4</sup> km<sup>2</sup> of cultivated land was reduced by 11.8% over the past 40 years. About 14,521.40 km<sup>2</sup> of cultivated land was converted to nursery and orchard from 1980 to 2020. The conversion area was unevenly distributed among different administrative regions. Zhejiang and Anhui Provinces had higher conversion rate and area than Jiangsu Province and Shanghai Municipalities. After the illegal nurseries and orchards return to cultivated land, if rotation farming mode is adopted, in which each grain crop is planted only once a year, the increased production of rice, wheat, corn, beans and tubers will reach (632.57 ± 13.08) × 10<sup>4</sup>, (0~531.05 ± 33.25) × 10<sup>4</sup>, (0~556.19 ± 30.36) × 10<sup>4</sup>, (0~249.85 ± 13.14) × 10<sup>4</sup> and (0~489.11 ± 28.14) × 10<sup>4</sup> tons at most in each year, respectively. Our results provide theoretical guidance for implementing food security policies and alleviating contradiction between grain production and rural labor shortages in the Yangtze River Delta region.https://www.mdpi.com/2073-445X/11/11/1993cultivated land protectiongrain productionfood securityurbanizationillegal conversion of cultivated land |
| spellingShingle | Yirui Han Qinqin Pan Yuee Cao Jianhong Zhang Jiaxuan Yuan Borui Li Saiqiang Li Renfeng Ma Xu Luo Longbin Sha Xiaodong Yang Estimation of Grain Crop Yields after Returning the Illegal Nurseries and Orchards to Cultivated Land in the Yangtze River Delta Region Land cultivated land protection grain production food security urbanization illegal conversion of cultivated land |
| title | Estimation of Grain Crop Yields after Returning the Illegal Nurseries and Orchards to Cultivated Land in the Yangtze River Delta Region |
| title_full | Estimation of Grain Crop Yields after Returning the Illegal Nurseries and Orchards to Cultivated Land in the Yangtze River Delta Region |
| title_fullStr | Estimation of Grain Crop Yields after Returning the Illegal Nurseries and Orchards to Cultivated Land in the Yangtze River Delta Region |
| title_full_unstemmed | Estimation of Grain Crop Yields after Returning the Illegal Nurseries and Orchards to Cultivated Land in the Yangtze River Delta Region |
| title_short | Estimation of Grain Crop Yields after Returning the Illegal Nurseries and Orchards to Cultivated Land in the Yangtze River Delta Region |
| title_sort | estimation of grain crop yields after returning the illegal nurseries and orchards to cultivated land in the yangtze river delta region |
| topic | cultivated land protection grain production food security urbanization illegal conversion of cultivated land |
| url | https://www.mdpi.com/2073-445X/11/11/1993 |
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