Abstract: The diurnal and seasonal variations of transpiration rate'of four conifers are measured in relation to the variation of environmental factors. The daily course of transpiration rate follows the daily course of light intensity and its seasonal course peaks in July. The transpiration rate of new needles is greater than that of one or two years' needles. The water consumption during growing season is calculated as: Pinus sylyestris vat, mongolica 152.00 mm, P. tabulaeformis 169.05 mm and Picea crassifolia 181.42 mm, which respectively occupies 60%, 73% and 79% of precipitation at the same period.

Key words: Yangtze River estuary, macro-jellyfish, fishery resource