Analysis of the temporal and spatial evolution characteristics and influencing factors of China's herbivorous animal husbandry industry.

From 1980 to 2017, the ratio of the short axis to the long axis of the standard deviational ellipse of the spatial distributions of the herbivorous animal husbandry industry in China showed a decreasing trend ( Fig 4a ), and the oblateness of the ellipse was observed to be smaller.

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The distribution center of China’s herbivorous animal husbandry moved in a northeast direction, which showed an obvious trend of China’s herbivorous animal husbandry transferring from the pastoral areas to the agricultural areas.

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Therefore, under the assumption of normal distributions, the results of index testing were also highly significant, as shown in Fig 2 .

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To be specific, in the past four decades, the spatial distribution center of China’s herbivorous animal husbandry industry has moved towards the northeast, crossing the boundary between agriculture and animal husbandry in China, presenting a clear trend of moving from pastoral area to agricultural area; the gradual narrowing of the spatial distribution range indicates the gradually increased degree of aggregation within the industry; the east-west stretch of spatial distribution has been strengthened, and the azimuth angle shows clockwise change,

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