以下为句子列表：
英文: It is the only natural preserve in China with well protetcted secondary growth for comprehensive and multi-principle research , especially the well protected primeval forest has a critical position for research on evolution of paleophyte .
中文: 它是国内次生林区植被保存完整珠一个综合性、多学科的森林生态类型自然保护区，尤其是其保存完好的原始森林，为研究古代植物进化有着极重要的科研价值。
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英文: Of the ten national-level and provincial-level nature reserves, most belong to the primeval forest ecological system.
中文: 还有十多个国家级和省级的自然保护区，其中不少是原始森林生态系统。
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英文: The reason is that the quality and function of current forest can not match the natural primeval forest with perfect soil conservation effectiveness.Because unitary surface material and less land surface roughness which can not retain runoff lead to short
中文: 原因是目前的森林质量和功能都无法与具有水土保持功能的原始森林相比，其地表组成物质太少且单一，地面粗糙度低，起不到对地表径流的阻挡作用，致使地面径流汇流时间缩短，洪水下泄快并容易形成洪水叠加，导致洪涝灾害加剧。
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