英语语法分析

In fruit mature period, muskmelon had higher biomass in organic production system, but there was no significant difference on market yield in both systems.

果实成熟期，甜瓜在有机生产体系中生物量较高，但两种体系的市场产量差异不显著。

That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.

这一点很重要，因为理论表明，当目标鱼种的生物量为其原始水平的50%左右时，渔场才能达到可收获的最大可持续产量。

The biomass of Keteleeria has been investigated and analyzed.

对油杉种群的生物量进行了测定和研究。