This district classification is intended to be applied as implementation of the county's general plan in the mountain, upland foothill, and valley areas of the county in which forestry, mining, grazing and recreation (e.g., hunting, hiking, camping, fishing, off-road vehicle use and nature study) are natural and desirable uses; and in floodplains and important water basin in which protection of water shed lands from wildfire, erosion, pollution and other detrimental effects is essential to the general welfare of residents of the county. It is further intended that this district will be applied to land areas which are classified by the general plan as natural resource land uses and identified as intensive agriculture, extensive agriculture, open space, scenic corridor, conservation/conservation corridor, and trail corridor, or other natural resource land use designations adopted in addition to, or to replace the foregoing.