摘要
应用能值分析的方法 ,分别对江苏省射阳河口的 3种治理方法 :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。计算结果为能值投放 A:2 .84 E+1 2 sej/a· m2 ;B:3.67E+1 1 sej/a1· m2 ;C:8.94 E+1 1 sej/a·m2 ;能值产出 A:5.78E+0 9sej/a· m2 ;B:3.4 4E+1 1 sej/a· m2 ;C:3.4 6E+1 2 sej/a·m2。从主要能值指标看 ,A的持续性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 ,C的能值产出更大。以能值为单位 ,考察资源的最佳配置点 ,B的自然资源对资本和服务的边际技术替代率较大 ,其 MRTS=MP2 /MP1较大说明 B的人类经济活动所投入占的比例较小 ,增加少量的资本和服务投入可取得更大的边际产出。
Estuary of Shuangyang River,Jiangsu Province,was selected for this study.The seashore bank in this area was often eroded by typhoons and storms.Three approaches involving plan Arepairing without plantation,plan BPlantation of S. alterniflora without uses,plan C S . alterniflora Ecological Engineering(SAEE)were practiced.This article describes the EMERGY analysis of these plans. The EMERGY analysis of three approaches results as following: EMERGY inflows,A:2 84E+12 sej/a·m 2;B:3 67E+11sej/a·m 2;C:8 94E+11 sej/a·m 2;EMERGY Export,A:5 78E+09sej/a·m 2;B:3 44E+11 sej/a·m 2;C:3 46E+12sej/a·m 2. These data indicates that plan CSAEE was the most beneficial option,with a net benefit of 2.57E+12 sej/a·m 2 .It is calculated to be US ＄0 295/a·m 2 based on the macroeconomics values in 1988.Then,in the practical area of 150hm 2 the total macroeconomics values is US ＄443 000(1988).plan A is not a maintainable system,it needs economic inflows every year. From the economics'point of view,plan C indicates the best allocation of resources.The Marginal Ratio of Technical Substitution(MRTS) of plan B is very small.If we invest little capital or services in plan B,we can get a relatively large marginal production. The results suggest that alternative C is the best management strategy among the three for the salt marsh wetland with eroded bank in southease China.SAEE embodies the principles of ecological engineering.
出处
《生态学报》
CAS
CSCD
北大核心
2000年第6期1045-1045,共1页
Acta Ecologica Sinica
基金
江苏省科委重点资助项目
