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三、森林的第一性生产(一)第一性生产的标准如前所述,纯生产量就是某期间内新生的生物体量。这里值得注意的是前后两个时间之间现存量的增量问题。现在把期间开始t_1的现存量规定为y_1,期间终了t_2的现存量规定为y_2,把这期间的新生生物体量即纯生产量规定为△P_n,同一期间因枯损、落枝落叶等的脱落量规定为△L,动物的吃食量规定为△G,则可用式(3)表示。
III. FIRST PRODUCTION IN FORESTS (I) Criteria for Primary Production As mentioned above, the net production is the amount of newborn biomass in a given period. What merits attention here is the increase in the stock of existing stocks between the two previous days. The current stock at the beginning of the period t_1 is defined as y_1, the existing stock at the end of the period t_2 is denoted by y_2, and the amount of fresh biomass at this period, that is, the net production, is defined as ΔP_n. The amount of regulation is △ L, the animal’s food intake is defined as △ G, you can use type (3) said.