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Article

Paddy Field Expansion and Aggregation Since the Mid-1950s in a Cold Region and Its Possible Causes

Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin 130102, China
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Remote Sens. 2018, 10(3), 384; https://doi.org/10.3390/rs10030384
Received: 20 December 2017 / Revised: 26 February 2018 / Accepted: 27 February 2018 / Published: 1 March 2018
Over the last six decades, paddy fields on the Sanjiang Plain have experienced rapid expansion and aggregation. In our study, land use and land cover changes related to paddy fields were studied based on information acquired from topographic maps and remote-sensing images. Paddy field expansion and aggregation were investigated through landscape indices and trajectory codes. Furthermore, the possible causes of paddy field expansion and aggregation were explored. Results indicated that such fields have increased by approximately 42,704 ha·y−1 over the past six decades. Approximately 98% of paddy fields in 2015 were converted from other land use types. In general, the gravity center moved 254.51 km toward the northeast, at a rate of approximately 4.17 km·y−1. The cohesion index increased from 96.8208 in 1954 to 99.5656 in 2015, and the aggregation index grew from 91.3533 in 1954 to 93.4448 in 2015, indicating the apparent aggregation of paddy fields on the Sanjiang Plain. Trajectory analyses showed that the transformations from marsh as well as from grassland to dry farmland and then into paddy fields were predominant. Climate warming provided a favorable environment for rice planting. Meanwhile, population growth, technological progress, and government policies drove paddy field expansion and aggregation during the study period. View Full-Text
Keywords: paddy field expansion; land use and land cover change; the Sanjiang Plain; climatic changes; remote sensing; food security paddy field expansion; land use and land cover change; the Sanjiang Plain; climatic changes; remote sensing; food security
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MDPI and ACS Style

Yan, F.; Yu, L.; Yang, C.; Zhang, S. Paddy Field Expansion and Aggregation Since the Mid-1950s in a Cold Region and Its Possible Causes. Remote Sens. 2018, 10, 384. https://doi.org/10.3390/rs10030384

AMA Style

Yan F, Yu L, Yang C, Zhang S. Paddy Field Expansion and Aggregation Since the Mid-1950s in a Cold Region and Its Possible Causes. Remote Sensing. 2018; 10(3):384. https://doi.org/10.3390/rs10030384

Chicago/Turabian Style

Yan, Fengqin, Lingxue Yu, Chaobin Yang, and Shuwen Zhang. 2018. "Paddy Field Expansion and Aggregation Since the Mid-1950s in a Cold Region and Its Possible Causes" Remote Sensing 10, no. 3: 384. https://doi.org/10.3390/rs10030384

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