(38)the regulation of prohibition of the cutting or destruction of trees or shrubs, or of the making of excavations, or of the removal of soil of quarrying, where such regulation or prohibition appears to the Board to be not prejudicial to the maintenance of ecological balance and to be necessary for the maintenance of a water-supply, the preservation of the soil, the prevention of landscape or of the formation of ravines or torrents, or the protection of land against erosion, or against the deposit thereon of sand, gravel or stones;
