因此北太平洋海獭的近乎绝灭，导致了海胆的大量繁殖，海胆随后毁掉了迄今维持着自身生态系统的巨藻林。
Thus the near extinction of sea otters in the northern Pacific led to a proliferation of sea urchins, which then laid waste an entire kelp forest that had hitherto sustained its own ecosystem.
本文对2.5年生和3.5年生巨桉纸浆原料林的生物量和生产力进行了测定和研究。
In this paper, the biomass and productivity of 2.5-year and 3.5-year old Eucalptus grandis were studied.
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