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首页> 外文期刊>Ecological research >Livestock-exclusion duration required for restoring grassland in semiarid, loess region in China: Estimate based on species composition measured from small-scale vegetation patterns
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Livestock-exclusion duration required for restoring grassland in semiarid, loess region in China: Estimate based on species composition measured from small-scale vegetation patterns

机译：畜牧排除持续时间需要在中国的半干旱地区恢复草地：基于从小植被模式测量的物种组成的估计

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To restore the degraded grassland in the Yunwushan Natural Reserve of Ningxia semiarid loess region, Ningxia Autonomous Region, China, managers have established grasslands with excluding livestock from one large area every 5 years since 1982. The annual precipitation at the site is around 400 mm, and heavy grazing by sheep/goats has been conducted in the past. In July 2009 in which vegetation surveys were conducted, seven grasslands with different exclusion durations such as 0, 2, 7, 12, 17, 22 or 27 years had already been established. The objectives of survey were to clarify the vegetation changes with exclusion duration, and to estimate the number of years required for recovering the vegetation. In each of these grasslands, 100 50 x 50 cm(2) quadrats, each of which was further divided into four 25 x 25 cm(2) sub-quadrats, were set, and then each of the species occurring within each sub-quadrat was recorded. Aboveground biomass and soil hardness within each quadrat were also measured as auxiliary variables. We used eco-statistical survey and analysis methods of small-scale spatial patterns of vegetation. The followings are results obtained: after 12-17 years of exclusion, (a) the soil had softened; (b) the aboveground biomass had increased to amounts 200 dw g m(-2); (c) the spatial uniformity in biomass increased to a stationary state; and (d) the dissimilarity of species composition between two successive exclusion durations decreased to a stationary state. We conclude from these observations that the degraded grassland required 12-17 years of exclusion to restore vegetation and productivity. We also proposed candidates of plant species to be seeded or planted for recovering degraded grassland in this area.
机译：宁夏自治区云水天然保护区宁夏自治区恢复降解草地，经理已建立草地，自1982年以来每5年从一个大面积排除牲畜。该网站的年降水量约为400毫米，羊/山羊的沉重放牧是在过去进行的。 2009年7月在其中进行了植被调查，已经建立了七种草地，其中七种不同的排除持续时间，如0,2,7,12,17,22或27年。调查目标是澄清植被的变化，排除持续时间，并估计恢复植被所需的年数。在这些草原中的每一个中，1000×50cm（2）个四边形，每个四个Quadrat分为四个25×25cm（2）个子 - 四字，然后在每个子四边地区发生的每种物种被记录。每Quadrat内的地上生物量和土壤硬度也被测量为辅助变量。我们使用了植被小规模空间模式的生态统计调查和分析方法。结果是得到的结果：排除12-17岁后，土壤软化; （b）地上生物质增加至200〜-2）; （c）生物质的空间均匀性增加到静止状态; （d）在两个连续排斥持续时间之间的物种组成之间的异化减少到静止状态。我们从这些观察结果中得出结论，降级草原需要12-17岁以恢复植被和生产力。我们还提出了植物物种的候选人，用于在该地区恢复退化的草原。

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