《Tab.5 The codes of variables》

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《近40年来窟野河流域土地利用类型变化及驱动因素》

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The coal mining variable was also an important variable in this study.The water yield was an important index measuring the capacity of the aquifer in the coal mining area to produce water.Higher water yield indicated that the mine had a larger capacity to produce water.The goaf meant the underground\""cavity\""created by mining activities.Generally，the water yield increased with the enhancement of mining area and volume in the early stage of mining.But the water yield of a mine remained at a stable constant when a certain mining depth was reached.Thus，X9-X11 were critical indexes to measure the change in mining intensity in the Kuye River Basin over the nearly40years.