...作用；暗呼吸；二氧化碳净交换量； [gap=1639]Key words: headwater area of Three Rivers；photosynthesis；dark respiration；net carbon dioxide exchange.
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The maximum photosynthetic rate, light saturation point, light compensation point and dark respiration were smaller under weak light intensity than those under strong light intensity.
弱光生境中秋茄幼苗的最大光合速率、光饱和点、光补偿点和暗呼吸速率较低。
Among these four species, the dark respiration rate was lowest and the water use efficiency was highest for L. communis, and the selected absorptance of mineral nutrients was strong in C.
香叶树的暗呼吸强度最低而水分利用效率最高，腊梅则对土壤矿质营养的选择性主动吸收能力最强。
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