自然灾变 meaning in English

convulsion of nature

The objects of their study are the degraded nature ecological system which done by natural calamities or people activities
其研究对象是那些在自然灾变和人类活动压力下受到破坏的自然生态系统。
Restoration ecology is ranked as one of three hotpots in biological realm as well as biological diversity and global climate change in recent years , which is one fresh branch of modem ecology . its primary research includes : the cause of degradation in ecosystem , techniques and methods of degraded ecosystem restoration and reconstruction , process and mechanism of ecology , research objectives of which are the destroyed ecosystems under the stress of natural catastrophes and human activities
恢复生态学与生物多样性和全球气候变化并列为生物领域的三大研究热点，它主要研究生态系统退化的原因、退化生态系统恢复和重建的技术与方法、生态学过程与机理的科学，是现代生态学的年轻分支之一，其研究对象是一些在自然灾变和人类活动压力下受到破坏的生态系统。