中文摘要：

动物为适应外界环境的改变会在其形态和生理上发生相应的变化，内脏器官重量变化是其在器官水平上的主要表现之一。为探讨生境变化对小型哺乳动物内脏器官的影响，本文选取了原始林、次生林、薪材林、华山松Pinusarmandis人工林和日本落叶松Larixleptolepis人工林5种林型，调查生境变化下社鼠Niviventerconfucianus内脏器官重量的变化。结果显示，5种林型社鼠间心、肺和肝重量差异显著，心和肺值均以人工林中最高，肝值以次生林中最高，而肾和脾重量在不同林型间无显著差异。社鼠内脏器官的变化，是其对环境变化作出的积极响应，对其生存繁衍具有重要作用。

英文摘要：

Environmental change exposes individuals within a species to a range of selective pressures, to which they re- spond through adaptive behaviors and physiological refinements, affected by, natural selection for the best fitting phenotype. To explore the influence of habitat changes we investigated the variation exhibited in visceral organ mass of the Chinese white-bellied rat, Niviventer confucianus, among five different forest habitat types （primary forest, secondary forest, fuel- wood forest, Pinus armandis plantation forest, Larix leptolepis plantation forest）. By comparison, while spleen and kidney did not significantly differ among different forests, heart, lung and liver mass exhibit variation between these forest habitats, with the highest masses found in P. armandis plantation forest and L. leptolepis plantation forest for heart and lung and the highest masses found in secondary forest for liver. These variations indicate that N. confucianus is highly adaptable and able to respond to habitat alteration. This could be beneficial for its survival and reproduction.