Energy Production Characteristics of Chinese Fir Plantations at Different Growth Stages Effects of exogenous metallothionein on energy production and incretion of China Holstein cows Studies on Energy in Two Mangrove Communities, Bruguiera sexangula and Kandelia candel, in China Studies on the biological characteristics and dynamics of energy production of Miscanthus floridulus Matter Production and Resources Use Efficiency of Double-Cropping Silage Maize System