energy efficiency 第1页

STUDIES ON THE BIO-MIASS,PRIMARY PRODUCTIVITY AND ENERGY USE EFFICIENCY OF THE MIXED FOREST COMMUNITY IN MT. DINGHUSHAN,CUANGDONG Energy Flow in the Agroecosystem of Farming-Livestock-Fruit System analysis of typical models of eoo-agricultural construction in Taihang Piedmont--A case study from Luancheng County of Hebei Produce ENERGY FLOW CHARACTERISTICS OF ALLEY CROPPING ON HILLSIDES IN SICHUAN, CHINA