摘要
生态系统内部自由能的积累，使系统失去平衡并趋于同其它生态系统结合，自由能驱使两个或两个以上的生态系统或亚生态系统，通过会聚，超循环和耦合而联合，从而形成具有特殊结构一功能的更高一级的新系统。系统耦合可以多途径解放生态系统中的自由能而增加农业生态系统的生产力，亦即从催化潜势，位差潜势，多稳定潜势及管理潜势中取得能输出。上述过程可作用于农业系统中的四个子系统，这四个子系统各有自己的产品：前植物生产，植物生产，动物生产，外生物生产，从而大幅度提高其生产力。在荒漠─绿洲草地农业生态系统中，本文分别计量了各个子系统的能流单位及其流程，证明它的子系统也可以成功的发生系统耦合，其中绿洲子系统应居关键地位。
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。
出处
《草业学报》
CSCD
1994年第3期1-8,共8页
Acta Prataculturae Sinica
基金
国家自然科学基金
关键词
系统耦合
荒漠
草地
绿洲
农业
Agro-ecosystem,System couling,Pre-plant production level,Plant productionlevel, Animal production level, Ultrabiological production level,Desert-oasis subecosystem
