tailieunhanh - A New Ecology - Systems Perspective - Chapter 7

7 Ecosystems have complex dynamics – disturbance and decay THE NORMALITY OF DISTURBANCE Up to this point, the focus of this book has been on growth and development processes in ecosystems. In fact, these are most important features of ecosystem dynamics and they provide the origins of various emergent ecosystem properties. | 4 5 2007 11 52 Page 143 7 Ecosystems have complex dynamics - disturbance and decay Du siehst wohin du siehst nur Eitelkeit auf Erden. Was dieser heute baut reißt jener morgen ein Wo itzund Städte stehn wird eine Wiese sein Auf der ein Schäferskind wird spielen mit den Herden Was itzund prächtig blüht soll bald zertreten werden. Was itzt so pocht und trotzt ist morgen Asch und Bein Nichts ist das ewig sei kein Erz kein Marmorstein. Itzt lacht das Glück uns an bald donnern die Beschwerden. Der hohen Taten Ruhm muß wie ein Traum vergehn. Soll denn das Spiel der Zeit der leichte Mensch bestehn Ach was ist alles dies was wir für köstlich achten Als schlechte Nichtigkeit als Schatten Staub und Wind Als eine Wiesenblum die man nicht wiederfind t. Noch will was ewig ist kein einig Mensch betrachten Andreas Gryphius 1616-1664 Es ist alles eitel THE NORMALITY OF DISTURBANCE Up to this point the focus of this book has been on growth and development processes in ecosystems. In fact these are most important features of ecosystem dynamics and they provide the origins of various emergent ecosystem properties. But the picture remains incomplete if disturbance and decay are not taken into account. On the following pages we will try to include those destructive processes into the new ecosystem theory as elaborated in this book. As a starting point for these discussions we can refer to common knowledge and emotion as it is described in the poem of Andreas Gryphius see above who outlines the transience of human and environmental structures Nothing lasts forever towns will turn into meadows flourishing nature can easily be destroyed our luck can turn into misfortune and in the end what remains is emptiness shadow dust and wind. Although the poet seems to be comprehensible concerning the significance of decay we cannot agree with his pessimistic ultimate In the end the death of organisms and disturbance of ecosystems can be useful elements of the growth .

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