primary productivity的用法和樣例：
例句
- Ferns were the first terricolous vascular plants, and still comprise an important part of primary productivity of ecosystems.
蕨類植物是最早登陸的維管植物，至今仍然是生態系統初級生產力的重要組成部分。 - The results indicated that the aboveground net primary productivity of the ecosystem was more related to the dynamic changes of precipitation and temperature.
結果表明，高寒草甸凈初級生產力的動態行為以對降水和氣溫的即時直接響應為主。
