00738naa a2200301 a 450000100080000000500110000800800410001910000160006024500540007626000090013065000160013965000100015565000110016565000150017665000160019165000160020765000120022365000150023565300200025065300180027065300110028865300140029965300120031365300120032565300110033770000170034877300710036510112701994-03-05       1990    bl ---       0--  u    #d1 aDAZHONG, W.  aEnergy flow in agroecosystems of northeast China.  c1990  aagriculture  aChina  aenergy  atechnology  aAgricultura  aEcossistema  aEnergia  aTecnologia  aAgroecossistema  aAgroecosystem  aChange  aEcosystem  aMudanca  aSistema  aSystem1 aPIMENTEL, D.  tEcological Studies, Analysis and Synthesisgv.78, p.322-336, 1990.