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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. secondary forest Natural forest growth after some major interference (for example, logging, serious fire, or insect attack). sedimentation The action or process of forming or depositing sediment. seed dispersers Natural means of sowing or distributing seeds. sheet erosion The removal of a fairly uniform layer of soil from the land surface by runoff water. shifting cultivation Any farming system where land is periodically cleared, cropped, and returned to fallow; synonymous with slash-and-burn or swidden agriculture. siltation To choke, fill over, or obstruct with silt or mud. silviculture The science and art of cultivating forest crops, based on a knowledge of forest tree characteristics. silvopastoral system An agroforestry system that combines pastures (with or without animals) and trees. sink Anything that can absorb and store carbon circulating in the atmosphere. soil amendment Any substance such as lime, sulfur, gypsum, or sawdust used to alter the properties of a soil, generally to make it more productive. Fertilizers are soil amendments, but the term is used most commonly for materials other than fertilizers. soil biota Organisms that live in the soil. soil degradation Degeneration of the soil through erosion, nutrient depletion, and other degenerative processes. spatial integration Interaction of land uses or agroecosystem components because of physical proximity as, for example, in strip cropping systems. species A group of actually or potentially interbreeding natural populations that are reproductively isolated from other such groups. Species is the smallest of the commonly used units of classification and the easiest to recognize intuitively. staple crop A crop that is used, enjoyed, or needed constantly by many people in a given area or country. It is provided or imported in large quantity into the area; examples are maize in Kenya and rice in Liberia. subsistence farming Farming or a system of farming that provides all or almost all goods required by a farm family, usually without any significant surplus for sale. subtropics The region bordering the tropical zone. sustainable An agricultural production system in which the farmer increases or maintains productivity at levels that are economically viable, ecologically sound, and culturally acceptable, through
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