Related by context. Frequent words. (Click for all words.) 64 soils 62 peatland 58 peatlands 57 silts 57 lowland forests 57 peat bogs 57 sandy soils 56 vegetation 55 softwoods 55 forests 55 sphagnum moss 54 rotting vegetation 53 atmospheric nitrogen 53 streambeds 53 virgin forests 53 tropical rainforests 53 heartwood 53 topsoil 53 temperate forests 53 clay soils 53 fertile soils 52 Arctic permafrost 52 rootball 52 eucalypts 52 longleaf pines 52 tropical forests 52 acidic soil 51 forest ecosystems 51 hydrological cycle 51 croplands 51 silt 51 wetland habitats 51 sandy loam 51 freshwater wetlands 51 understory 51 lakebed 51 Melting glaciers 51 seagrasses 51 alkaline soil 51 seabeds 50 wetlands 50 woody debris 50 freshwater ecosystems 50 rainforests 50 boreal forests 50 Severe drought 50 hardwood forests 50 soil 50 sediment 50 reforested 50 carbon dioxide 50 mycelium 50 pasturelands 50 wetland 50 stratospheric ozone layer 50 soot particles 50 woody 50 carbon sinks 50 barrens 50 terrestrial ecosystems 50 hardwood trees 50 sediments 50 sandy soil 50 hardpan 50 saturated soils 49 freshwater marshes 49 absorbing carbon dioxide 49 grassland 49 kerogen 49 grasses 49 eucalypt 49 ecosystems 49 CO2 49 woody plants 49 mangrove 49 calcareous 49 pine plantations 49 coarse sand 49 Sulfur dioxide 49 crop residues 49 biosphere 49 drylands 49 tidal marshes 49 iron oxides 49 mangroves 49 marine sediments 48 reed beds 48 leaf litter 48 mangrove forests 48 conifer trees 48 deplete oxygen 48 permafrost 48 Rainforests 48 tropical rainforest 48 fungal spores 48 atmospheric methane 48 Invasive plants 48 Large tracts 48 coconut plantations 48 evenly moist 48 grassland habitat