甘肃干旱半干旱地区数种啮齿动物挖掘活动引起沙漠化问题的探讨

本文主要介绍了甘肃中部半干旱区及河西走廊干旱区数种啮齿动物挖掘活动引起沙漠化的状况。     

子鼠开春——说说地球上不可或缺的“公民”

鼠年说鼠说起老鼠这个名词,至少有三层含义。其一,泛指所有哺乳纲啮齿目(Rodentia)的动物,凡是属于这个目的成员都可以称为广义的老鼠,根据最新最权威的统计,世界上约有34科501属2488种啮齿目动物,比上一个鼠年,增加了1科20属211种。近年来人们还在不断发现啮齿类动物的新物种,所有啮齿动物占据了哺乳动物种数的五分之二强。     

内蒙古伊金霍洛旗的啮齿动物生态地理

本文通过1987年7—8月间对伊克昭盟的准格尔旗、伊金霍洛旗及东胜市区进行的啮齿动物的调查，根据地理环境、啮齿动物种类和分布，其栖息环境大体分为干草原、荒漠草原和农田生态地理型且其地理分布及种类成份以蒙新区为主要成份。现仅将伊金霍洛旗的调查资料整理成文，予以报导。     

靖远,会宁,固原三角地带半干旱环境的啮齿动物群

靖远、会宁、固原地处我国黄土高原的西部半干旱干草原生态环境，植被稀疏，生态环境脆弱，动物种类亦较为贫乏。根据自然环境、啮齿动物种类和分布的情况，该区大致可分为四个生态地理型──森林灌丛、干草原、荒漠草原和农田。     

内古蒙伊金霍洛旗的啮齿动物生态地理

本文通过１８９７年７－８月间对伊克昭盟的准格尔旗、伊金霍洛旗及东胜市区进行的啮齿动物的调查，根据地理环境、啮齿动物种类和分布，其栖息环境大体分为干草原，荒漠草原和农田生态地理型且其地球分布及种类成份以蒙新区为主要成分。现仅将伊金霍洛旗的调查资料整理成文，予以报导。     

Effects of forest roads on habitat pattern for sables in Da Hinggan Mountains,northeasten China

The anthropogenic managements of forest have created a network of roads resulting in the loss and alternation of habitat. To better understand road＇s impact on animal habitats, we assessed the habitat pattern of sables （Martes zibellina）, one of rodents within national first-class protected species, when roads are considered in Huzhong area in Da Hinggan Mountains, northeastern China. Em- ploying published literatures about behavior ecology, aerial photographs and forest stand maps, we classified the study area into three habitat types including best-suitable, suitable and unsuitable habitats based on sable habitat requirements at the landscape scale includ- ing four variables derived from forest source map with attribute database. Results indicated the loss and significant fragmentation of best-suitable habitat and home range habitat when roads, especially 150 m avoidance distance of roads, were considered. The roads re- duced and fragmented highly suitable habitats more significantly during earlier development period than the later development period. Additionally, the suitable area percentage increased with increasing distance to roads. This study helped to identify the suitable area for sables and location of sable population. Also, this study suggested the passage construction and road management involving road clo- sure and removal will reduce the fragmentation functionally and benefit the sable population.