; or (4) under any other applicable law. (j) Applicability of other land management designations Nothing in this section affects— (1) any other land or water management designation under any other provision of law; or (2) any obligation to comply with a requirement applicable to such a designation. (k) Native American treaty rights Nothing in this section alters, modifies, enlarges, diminishes, or abrogates the treaty rights of any Indian tribe, including any off-reservation reserved rights. IV Maintenance of public land A Volunteers 401. Private-sector volunteer enhancement program (a) Purpose The purpose of this section is to promote private-sector volunteer programs within the Department of the Interior and the Department of Agriculture to enhance stewardship, recreation access, and sustainability of the resources, values, and facilities of the Federal land managed by the Federal land management agencies. (b) Definitions In this section: (1) Federal land The term Federal land means any land— (A) owned by the United States; and (B) managed by the head of a Federal land management agency. (2) Secretary concerned The term Secretary concerned means— (A) the Secretary of Agriculture (acting through the Chief of the Forest Service), with respect to National Forest System land