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来自全球的研究人员通过分析483个热带树木年轮序列,首次系统评估了1930年以来干旱对热带森林茎生长的长期影响。研究发现,在最干旱的年份中,茎生长仅出现2.5%(95%CI:2.2-2.7%)的微弱下降,且这种下降通常不持续到干旱年后。值得注意的是,裸子植物(gymnosperms)比被子植物(angiosperms)更易受旱季干旱影响,而雨季干旱对后者影响更大。该研究揭示了热带森林碳汇功能对历史 ...
Gymnosperms (Gymnospermae) are a group of seed-bearing plants with ovules borne on the edge or blade of an open sporophyll, the sporophylls usually arranged in cone-like structures. The other ...
However, all living gymnosperms shared the signature of an ancient duplication in the past more than 350 million years ago. More than 100 million years after that event, another duplication gave ...
But gymnosperms also comprise gnetales (like W. mirabilis), the palm-like cycads and ginkgo, also known as the maidenhair tree. When dinosaurs roamed Earth, they walked among the gymnosperms ...
Development of the embryo sac is arguably the key element in the evolution from gymnosperms to flowering plants, also known as angiosperms. Yet the fossil record reveals very little about the stages ...
We have only twelve species of gymnosperms in Ireland and they are all trees or shrubs: three firs (European Silver-fir, Noble Fir, and Douglas Fir), two spruces (Norway Spruce and Sitka Spruce ...
The fossil record shows us that around 100 million years ago, during the Cretaceous period, a huge variety of angiosperms came onto the scene and replaced gymnosperms as the dominant type of plant ...
All the latest science news on gymnosperms from Phys.org. Find the latest news, advancements, and breakthroughs.
We have only twelve species of gymnosperms in Ireland and they are all trees or shrubs: three firs (European Silver-fir, Noble Fir, and Douglas Fir), two spruces (Norway Spruce and Sitka Spruce ...