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System Coupling and Desert-Oasis Agro-ecosystem

Ren Jizhou;Wan Changgui(Gansu Grassland Ecological Research Institute,Gansu Agricultural University,P O. Box 61 Lanzhou,730020,China)  
The accumulation of the free energy in the ecosystem causes it unstable and tend to connectable forother ecosystems.The free energy drives the two or more than two ecosystems or subecosystems combinedtogether through the process of convergence,hypercycle,and coupling.The new ecosystems with uniquestructure-function to be established.It is the new ecosystem of higher grade。 The systems coupling mayliberate the free energy in several ways to increase the productivity of the agro-ecosystem。That means toget the output from the agro-ecosystem by some way to liberate the catalytic potential,the locationdifferent potential,the multistability potential and the management potential.All the processes mentionabove can effect on the four subecosystems of the agro-eccoystem which give four different preductiongroups in the four production levels respectively。 They are the pre-plant production,plant production,an imal production and ultrabiological production。Systems coupling leads to the productivity of theecosystem increases magnificently。The energy flow unite and the energy flow pattern has been checked inthe subecosystems of the desert-oasis agro-ecosystem。It shows that the system coupling can be reallZedsuccessfull。In which the oasis subsystem should be the key component。
【Fund】: 国家自然科学基金
【CateGory Index】: S181
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