蒲洼农业生态系统能流的稳定性及其动态

在研究生态系统结构及功能的基础上，本文基于１９７５－１９９０年的数据，对蒲洼农业生态系统能流的稳定性及其动态进行了分析。通过建立能流模型，由李雅普诺夫稳定性原理，得出该生态系统能流的平衡态具有渐近稳定性。动态数学模拟表明，目前该系统的能量流动正从不稳定状态向稳定和平衡态过渡，这一过程大约需要７ａ时间。

STABILITY AND DYNAMICS OF THE ENERGY FLOW OF THE PUWA AGRO-ECOSYSTEM

ased on the 1975-1990 data on energy flow through an agricuitural ecosystem inPuwa ,located in the southwest mountain area of Beijing city ,where the studies on the struc-ture and functions of ecosystem have been carried out ,the stability and dynamics of theenergy flow through this ecosystem were further analyzed. By establishing a compartmentmodel for energy flow and making a mathematically dynamic simulation based on the model,it was found that the ecosystem is presently in a state of deviating from its balance of energyflow,which has a progressive stabilit The energy flow through the ecosystem is being in atransition from a labile state to a stable state of blance.Such a process will take about 7 yearsif the ecosystem continues to keep its present structure and energy flow at present rate, Theecosystem is now insensitive to the input from its outside .