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[1]DUAN Jian,XU Yong,XU Xiaoren.Spatial Pattern and Changes of Grain Production in Loess Plateau Region Between 1985 and 2015[J].Research of Soil and Water Conservation,2019,26(05):381-388.

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Spatial Pattern and Changes of Grain Production in Loess Plateau Region Between 1985 and 2015

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 05 Page number: 381-388 Column: Public date: 2019-09-06

Title:: Spatial Pattern and Changes of Grain Production in Loess Plateau Region Between 1985 and 2015

Author(s):: DUAN Jian^1,2, XU Yong^1,2, XU Xiaoren³; 1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Shandong Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi, Shandong 276005, China

Keywords:: Loess Plateau region; grain output; spatial pattern; yield per unit area; sown area

CLC:: F326

DOI:: -

Abstract:: The problems of soil erosion, deterioration of ecological environment, backward economic development and grain shortages have long plagued the Loess Plateau region, which has attracted widely concerns of both government and academic circles. The Grain for Green Project implemented in the period 1999-2003 was the largest active revegetation programme in China, and the Chinese government has formulated a series of policies to expand the Grain for Green initiative. One concern with further expansion of Grain for Green is the availability of farmland and hence local food supply. In this paper, we firstly used the data of population, grain output, sown area and yield per unit area, and utilized the classification method and spatial autocorrelation analysis method to study the changes of the spatial distribution of grain production in Loess Plateau region between 1985 and 2015. Then, on this basis, we analyzed the factors contributing to the grain output increases by applying logarithmic mean weigh division index method. The analytical results showed that:(1) the capacity of grain production in Loess Plateau region had greatly improved, the total grain output and per capita grain output reached 4.45×10⁷ t and 396.53 kg in 2015, respectively. The local food production had already exceeded the satisfaction level food security, which laid a solid material foundation for further expansion of Grain for Green; (2) the spatial distribution of grain output in Loess Plateau region was uneven among the 284 counties, it also showed a trend that the spatial distribution of grain production was shifting from south to north and from east to west gradually; (3) the grain production in Loess Plateau region was mainly relied on the improvement of yield per unit area in the past 30 years; the regional grain output increased by 2.19×10⁷ t from 1985 to 2015; the contribution of yield per unit area accounted for 94.25%, which was much more than the contribution of sown area which just accounted for 5.75%; (4) we argued that continued expansion of revegetation in eastern mountainous area and loess hilly area would not cause food deficit. We suggest that the grain sown area in Erdos windy-sandy area should be reduced to save water resources; (5) this study could help increase the acknowledge of the grain security and ecological problems in Loess Plateau region from a historical and overall perspective, and also provide some references for the government to formulate policies to balance the regional grain production and ecological environment.

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