Abstract: The diurnal variation of the energy accumulation rate shows one or two-peak-changing patterns. The seasonal variation of totalyty of the diurnal energy accumulation is: autumn's>summer's>winter's>spring's. The layer variation of the energy accumulation rate is: tree's>subtree's>underbrush's. “Afternoon nap” is a general phenomenon with the population in its diurnal variation of energy rate and is the result of various physiological and ecological factors. The variation law of energy fixation of the population is in accordance with the law of energy accumulation, while variation law of energy absorption is in accordance with the energy dissipation of transpiration.

Key words: straw carbon source, microbial biomass carbon, microbial biomass nitrogen, protozoa abundance, relative abundance.