草基-鱼塘生态系统中能量转化与经济效益分析王德建,徐琪,刘元昌(中国科学院南京土壤研究所,210008)Grassdyke-FishpOndEcosystem──ItsEnergyConversionandEconolnicBenefit¥.WangDejian;XuQi;LiuYuanchang(InstituteofSoilScience,AcademiaSinica,Nanjins210008).ChineseJoumalofE-colegyl1993,12(2):29-30.Usingsimulationtestmethod,theenergyconversioninagrassdyhe-fishpondecosystemisstudied,andwithaproductivesystemascontrol,theeconomicbenefitoftheecosystemisanalyzed.Theresultsshow:1.theutilizationrateofsolarenergybygrassis0.6%,andtheconversionefficiencyfromgrasstofishis