{"thcode":2,"term":{"code":1156,"name":"terrestrial ecosystems","parent":319,"scope":"Communities of living organisms in a specific geographical location which exist primarily on land and not in water."},"uf":[{"name":"rangeland ecosystems","usewith":false}],"bt":[{"code":319,"name":"ecosystems","parent":921,"scope":"The interacting populations of plants, animals, and  microorganisms occupying a certain area, and their relationship to the environment."},{"code":921,"name":"population and community ecology","parent":1174,"scope":"Interactions of a single species (population) or an association of different species (community) occupying a particular region, including their biotic and abiotic environments."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[{"code":174,"name":"coastal ecosystems","parent":1156,"scope":"Biological communities and habitats within the narrow zones of land between the margin of oceans or seas and large landmasses."},{"code":245,"name":"desert ecosystems","parent":1156,"scope":"Biological communities and habitats in arid areas with little precipitation, sparse, highly adapted vegetation, and extreme temperatures."},{"code":410,"name":"forest ecosystems","parent":1156,"scope":"Biological communities and habitats in geographic areas with dense growths of trees and associated vegetation."},{"code":499,"name":"grassland ecosystems","parent":1156,"scope":"Biological communities and habitats with ground cover of grasses and other herbaceous plants, but few trees.  Examples include prairies, meadows, and savannas."},{"code":1706,"name":"island ecosystems","parent":1156,"scope":"Communities of living organisms on islands."},{"code":1059,"name":"shrubland ecosystems","parent":1156,"scope":"Biological land communities and habitats with sparse, low-growing vegetation."},{"code":1196,"name":"tundra ecosystems","parent":1156,"scope":"Biological communities and habitats located in the treeless plains of Arctic regions where the subsoil is permanently frozen."}],"rt":[{"code":311,"name":"ecology","parent":650,"scope":"Study of the relations between living plants and animals and their environment."},{"code":2289,"name":"state and transition modeling","parent":2286,"scope":"Modeling of systems such as ecosystems to predict the consequences of natural events and management actions by describing how specified events and actions may change the components and relationships in the system."},{"code":1326,"name":"wetland ecosystems","parent":319,"scope":"Ecosystems whose soil is saturated for long periods seasonally or continuously, including marshes, swamps, and ephemeral ponds.  More detailed terms for wetlands can be selected from the FGDC Wetland Classification <http:\/\/fgdc.gov\/standards\/status\/sub3_4.html>."}]}