《Table 3 The area of facility agriculture land in Xining in 2008 and 2018》

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The area dedicated to facility agriculture in Xining increased from 537.32 hm2 in 2008 to2，231.68 hm2 in 2018.Similar to the trend in the development of facility agriculture in Lhasa，facility agriculture also spread from the urban area to the periphery.The proportion of facility agriculture in the urban area decreased from 48.83%in 2008 to 16.07%in 2018，but the area increased from 251.61 hm2 to 358.69 hm2.The area dedicated to facility agriculture in Datong increased from 169.71 hm2 in 2008 to 630.39 hm2 in 2018，while the proportion decreased from 31.58%to 28.25%.Huangzhong showed the fastest development of facility agriculture，with the area increasing by 1，083.75 hm2（accounting for 63.96%of the newly increased area in the whole city）compared with 2008；it reached 1，183.75 hm2 or 53.04%of the total area in Xining.Due to the relatively long distance from the urban area，the the proportion of facility agriculture in Huangyuan decreased from 2.98%in 2008 to 2.64%in 2018（Table 3）.