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首页> 外文会议>Annual national meeting American Society for Surface Mining and Reclamation >VEGETATION TRENDS IN RECLAIMED AREAS AT GIBBONS CREEK LIGNITE MINE, GRIMES COUNTY, TEXAS
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VEGETATION TRENDS IN RECLAIMED AREAS AT GIBBONS CREEK LIGNITE MINE, GRIMES COUNTY, TEXAS

机译：德克萨斯州Grimes县Gibbons Creek Lignite Mine的再生地区植被趋势

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Vegetation productivity and cover studies have been conducted annually at the Gibbons Creek Lignite Mine since 1989, and multiple annual clippings have been collected since 1991. The primary purpose of these studies was to examine revegetation success, in terms of herbaceous productivity, for various post-mine soil types. However, the studies also contain detailed information on species composition. For the years in which multiple annual clippings have been collected (1991 through 1996), total vegetation cover increased, with the mean proportion of bare ground dropping from 12% in 1991 to 1% in 1996. Relative proportions of most introduced and native grasses were virtually static from 1991 through 1994; in 1995, however, herbicide applications to reduce clover cover resulted in a dramatic increase in total grass cover, especially in bahiagrass (Paspalum notatum) and Indiangrass (Sorgastrum nutans). In contrast to the trends of other introduced and native grasses, bahiagrass increased in cover throughout the study period, increasing from 7% in 1991 to 21 % in 1996. Annual and weedy grass species decreased in cover throughout the study period, falling from 12% cover in 1991 to 2% in 1996. This trend of displacement of annuals by perennials is typically observed during ecological succession in natural vegetation communities, and appears to have been accelerated by the herbicide application.
机译：自1989年以来，植被生产率和覆盖研究已经在Gibbons Creek Lignite Line进行了每年进行，自1991年以来已经收集了多个年度剪报。这些研究的主要目的是在草本生产力方面审查植物成功，以便在草本生产力方面进行各种职位矿山土壤类型。然而，研究还包含有关物种组成的详细信息。在收集多年来（1991年至1996年）的多年中，植被覆盖总覆盖率增加，裸地面的平均比例从1991年的12％降至1996年的1％。最介绍和本土草的相对比例从1991年到1994年的几乎静止;然而，1995年，除草剂申请减少三叶草覆盖导致总草覆盖的显着增加，特别是在巴伊亚草（Paspalum Notatum）和印度草（Sorgastum Nutans）中。与其他介绍和本土草的趋势相比，巴伊草在整个研究期间增加了覆盖率，从1991年的7％增加到1996年的21％。在整个研究期间，覆盖的年度和杂草草地下降，从12％下降1991年以1996年覆盖到2％。在自然植被社区的生态继承期间，通常观察到每年的年龄流离失所的这种流离失所趋势，似乎已加速除草剂申请。

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