摘要
应用能值分析的方法 ,分别对江苏省射阳河口的 3种治理方案 (海滨潮间带盐沼湿地(方案A)、互花米草湿地 (方案B)和互花米草生态工程 (方案C) )进行能值计算和评价 .计算结果为能值投入A :2 .84E +12Sej- 1m- 2 ;B :3.67E +11Sej- 1m- 2 ;C :8.94E +11Sej- 1m- 2 ;能值产出A :5.78E +0 9Sej- 1m- 2 ;B :3.4 4E +11Sej- 1m- 2 ;C :3.4 6E +12Sej- 1m- 2 .从主要能值指标来看 :A需以人类活动的不断投入来维持 ,B和C较A具有明显的优越性 ,B为自组织生态系统 ,C为生态工程系统 ,C的能值产出最大 。
The estuary of the Shuangyang River, Jiangsu Province, was selected for this study. In history, the seawall in this area was often eroded by typhoons and storms, and a large amount of money was spent repairing the seawall annually. Since 1985, Spartina alterniflora was planted on seashore to find a better way in protecting the seawall. Three ways involving Plan A-repairing without plantation, Plan B-Plantation of S.alterniflora without uses, Plan C? 玈.alterniflora Ecological Engineering (SAEE) have been practiced. This paper describes the Emergy Analysis for the three ways. A science based evaluation of a system is now available to represent both the environmental values and the economic values by using a common measure of Emergy. Emergy, a measure for real wealth, is the work previously required to generate a product or service. In an environmental economic system, there are 4 different flows: material flow, energy flow, currency flow and information flow. These flows can for the first time be measured on Emergy as a common evaluating standard, so Emergy analysis method provides a quantitative way to find what policies and patterns for humanity and nature are sustainable with fewer trials and errors, because they tend to anticipate self organization for maximum benefit and prosperity. The Emergy Analysis for 3 approaches results as following: Emergy inflows, A:2.84E+12 sej -1 m -2 ;B:3.67E+11 sej -1 m -2 ;C:8.94E+11 sej -1 m -2 . Emergy export, A:5.78E+09 sej -1 m -2 ;B:3.44E+11 sej -1 m -2 ;C:3.46E+12 sej -1 m -2 . These data indicate that Plan C-SAEE is the most beneficial option, with a net benefit of 2.57E+12 sej -1 m -2 . It is calculated to be $0.295 a -1 m -2 based on the macroeconomics values in 1988. Then, in the practical area of 150 m 2 the total macroeconomics values are $443 000(1988). Plan A is not a maintainable system. It needs most of economic input every year. The results showed that alternative C is a better management strategy than the other two for the salt marsh wetland with eroded seawall in Southeast China. SAEE embodies the principles of ecological engineering.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
2000年第5期592-597,共6页
Journal of Nanjing University（Natural Science）
关键词
互花米草
能值分析
生态工程
河口治理
Spartina alterniflora
Emergy analysis
ecological engineering
