PROGRESS IN GEOGRAPHY ›› 2020, Vol. 39 ›› Issue (9): 1557-1564.doi: 10.18306/dlkxjz.2020.09.012

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Optimal elevation interval of rice expansion in Northeast China

HUANG Yingze1,2,3(), QIU Bingwen1,2,3,*(), HE Yuhua1,2,3, ZHANG Ke1,2,3, ZOU Fengli1,2,3   

  1. 1. Key Laboratory of Spatial Data Mining & Information Sharing of Ministry of Education, Fuzhou University, Fuzhou 350116, China
    2. National Engineering Research Center of Geospatial Information Technology, Fuzhou 350116, China
    3. The Academy of Digital China (Fujian), Fuzhou 350116, China
  • Received:2019-09-23 Revised:2020-02-15 Online:2020-09-28 Published:2020-11-28
  • Contact: QIU Bingwen E-mail:939918076@qq.com;qiubingwen@fzu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(41471362);National Natural Science Foundation of China(41771468);Key Science and Technology Program of Fujian Province(2017I0008);Key Science and Technology Program of Fujian Province(2017L3012)

Abstract:

Timely acquisition for the spatiotemporal distribution information of rice planting is very important for adjusting and optimizing the structure of agricultural production. Based on the elevation and surface water data, we used a rice field mapping method that takes into consideration of vegetation phenology and surface water variations to carry out the research of spatiotemporal dynamics of paddy rice in Northeast China from 2001 to 2017. Through the verification at 899 survey sites, the overall accuracy of data reached 90.66% and the Kappa coefficient was 0.8128. The results indicate that: 1) At the beginning of the 21st century, the rice planting area in Northeast China decreased slightly at first and then increased continuously. In 2017, the rice planting area reached 2.13 times of that in 2001. About 60% of the rice planting expansion area was distributed in the Sanjiang Plain, 30% in the Songnen Plain, and less than 5% in the Lower Liaohe Plain. The dominant altitude range of rice planting expansion was within 200 m. With the increase of altitude, the relationship between rice planting expansion and surface water was getting closer. 2) Because the rice planting expansion in the Sanjiang Plain was increasingly more extensive at an altitude of 30-70 m, the dominant range was reduced from a relative altitude of 70 m to 40 m. In addition, the optimal rice planting area was gradually moving away from surface water bodies. However, the dominant altitude range of rice distribution in the Songnen Plain and the Lower Liaohe Plain was relatively stable. They were always at a relative altitude of 100 m and 40 m. 3) The concentrated distribution and rapid expansion of rice planting in the Sanjiang Plain led to the gradual shift of the optimal distribution area of rice planting away from surface water bodies, which will bring more pressure on groundwater. The distribution of rice planting in the Songnen Plain was greatly affected by surface water, and its distribution advantage decreased with increasing distance from surface water bodies. This study provides data support and a theoretical reference for the agricultural sector to assess water resources carrying capacity and ensure the sustainable development of agriculture.

Key words: rice planting, Northeast China, long time series, geographical factor, optimal area