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周至县地处关中西部。距西安市区68公里,地理坐标为东经107°39′-108°37′,北纬33°42′-34°14′;东依白马河中心线与户县为邻;南依秦岭主脉与佛坪、宁陕交界;西有界碑与眉县、太白县接壤;北凭渭河与武功、兴平县和杨陵区、扶风县相邻。县城与附近各地(以公路线为准)距离:东距户县、周至界32.5公里;西距眉县、周至界17.5公里;最东部与户县交界的是尚村乡的宋滩村;最南部与宁陕县交界的是板房子乡的光秃山、与佛坪县接壤的是厚畛子乡的光头山;最西部与眉县交界的是竹峪乡境内的鹰咀石;最北部是与兴平县交界的尚村乡的马寨滩。
兽类有金钱豹、青羊、黄羊、鹿、麝、狐狸、野猪、獾等40余种;鸟类有锦鸡、环颈雉、白脸山雀、斑啄木、松花鸡、长尾兰鹊、黄鹊、麻鹊、喜鹊等230余种。
珍贵动物有国家一类保护动物大熊猫、金丝猴、金毛扭角羚等,二类保护动物大鲵、金钱豹、斑羚、小熊猫、金猫、锦鸡等,三类保护动物林麝、豹猫等。
农作物害虫有30余种。农作物害虫天敌有126种。
森林害虫有174种。森林害虫天敌有12种。如赤眼蜂等。
河池自然鱼类有4目7科21种,有经济价值的鱼类有:鲤、鲫、细鳞鲑、鲶、黄鳝等。经济水生动物有:鳖、虾、蚌、螺、蛙等。珍稀鱼类及水生动物有:大鲵(娃娃鱼),秦岭细鳞鲑等。养殖鱼类有:青、草、鲢、鳝、鲂、鲤鱼种。放养鱼种有草鱼、青鱼、花鲢、白鲢、鲂、鲤鱼等。还有鳖、虾、鳝、蚌、螺、蟹等种。浮游动物4大类(原生动物、枝角类、轮虫、挠足类)60属种。
周至县林区为野生动物栖息繁殖提供了良好的生活环境。林中动物270余种。其中兽类有黑熊、金钱豹、青羊、黄羊、鹿、麝、狐狸、野猪、獾等达40余种;乌类有锦鸡、环颈雉、白脸山雀、斑啄木、松花鸡、长尾兰鹊、黄鹊、麻鹊、喜鹊等230余种。珍贵动物有国家一类保护动物大熊猫、金丝猴、金毛扭角羚等,二类保护动物大鲵、金钱豹、斑羚、小熊猫、锦鸡等,三类保护动物林麝、豹猫等。 周至县植被名目繁多,太白山有种子植物121科640属1550种;苔鲜植物63科142属302种;此外,还有大量的蕨类、地衣和菌类植物。太白山区域及厚畛子乡的光头山还生长着特有种植物,计有29个单属和1个特有属,150个特有种。
县内水域中有浮游植物8藻门100属种。
有各类草场毛面积98万亩(其中300亩以上草场4.35万亩、山区农林隙地零星草场15.4万亩、山地可食灌木林地草场78.25万亩)。可利用面积97万亩,亩产鲜草414公斤,总产量4万余公斤,可饲用量2.2万公斤,载畜量12万羊单位。
1989年已利用草场面积18.8万亩(放牧家畜的需要面积),占全县各类可利用草场面积的19%。主要牧草有芒、苔草、白羊草、黄背草、白茅、风轮草、野豌豆等,牧草质量较高。全县年产野草(干)946万公斤,主要有沙草、白茅、节节草、小芨、苦曲菜、野燕麦等,营养价值较高,青草季节割喂大家畜和羊,其中质量高的用于喂猪、喂鸡。 、
周至县林区地跨秦岭南北,南属北亚热带常绿落叶阔叶混交林带,北属暖温带落叶阔叶林带。有林地238.85万亩,占西安市的55.6%,主要分布在山区。畜牧草场96万余亩,是发展肉牛的良好天然基地。 县内分布着秦岭山前断裂带、渭河断陷盆地中的近东西向断裂带及北西向的哑柏——马召断裂带,这三大断裂带控制着地层地热的分布,并起主要的导热的储热作用,区域地热水储存量相当大,且补给来源充足。现已在楼观台、镇丰、哑柏成井3处,马召、西楼及镇东井沟凹地也具有良好的地热开发前景。

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