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OALib Journal期刊
ISSN: 2333-9721
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四川道孚县芒苞草生境的植物群落结构和土壤元素含量
DOI: 10.3724/SP.J.1145.2009.00001, PP. 1-7
Keywords: 芒苞草,群落,土壤元素,生境,四川道孚
Abstract:
芒苞草(achanthoclamysbracteatap.c.kao)是分布于横断山区局部狭小区域的一种单型科植物，在指示植物系统进化和地理环境变迁中具有十分重要的作用和地位.对四川省道孚县鲜水河流域的两个芒苞草分布地点(麦粒山和亚卓山)进行了群落学特征和土壤学研究.芒苞草生境群落类型为温性干旱河谷灌丛和草地，上接亚高山云冷杉针叶林.麦粒山芒苞草生境为毛莲蒿-矮嵩草-芒苞草群落；而亚卓山灌丛草地类型为川滇蔷薇-毛莲蒿-西南野古草-芒苞草群落，亚卓山草地则以西南野古草、直芒草、金发藓等为优势种.物种多样性指数以灌丛最高，亚卓山草地物种多样性在中海拔处出现极小值，海拔越高，芒苞草单株重量越轻，中海拔位置处的地上地下生物量比值(2.06±0.17)最大.土壤元素含量以铝和铁最丰富，而磷和钾的含量分别为(8873.5±1463.3)mgkg-1和(431.1±180.4)mgkg-1，比该区域的平均值低.芒苞草多生长在有岩石出露的地方，在道孚县的分布区域局限在鲜水河河谷地带.芒苞草强烈的生境选择作用以及河谷地带强度较大的人为活动，是威胁芒苞草生存的主要因素.图5表3参24
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