4 Discussion 4. Discussion. Progressive (natural) and regressive (anthropogen) succession. final stage.
{"Image DocumentName": "4 Discussion4. Discussion. Progressive (natural) and regressive (anthropogen) succession. final stage.", "Image ImageDescription": "forest. temporary stage. shrubs, shrubbery. pioneer stage. grasses, herbs. raw earth. fallow. Park lawns are similar to small clearings what concerns the light. If the human being renounced completely the hay, the park lawns would develop slowly to a forest. The human being counteracts this natural succession through measures as deforestation and hay. One speaks then of regressive succession and a subclimax society. If the sites of the adornment lawns are cut very often, these sites develop to extreme biotopes (ecological niche) because they are disturbed frequently. So we can find in the cutting-lawns a higher species number than in regular park lawns. The forest herbs are distinguished from each other strongly in the growth form. The environmental factors in the forest are adjusted. The cutting-lawns are very similar in the growth form. The environmental factors are very different there. The extreme circumstances like light or cutting require a small growth form. years. Progressive succession. spindle mower. girder mower. chainsaw. Regressive succession.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}