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首页> 外文期刊>Archiv fur Hydrobiologie >Effects of eucalyptus plantations on CPOM dynamics in headwater streams: a manipulative approach
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Effects of eucalyptus plantations on CPOM dynamics in headwater streams: a manipulative approach

机译：桉树人工林对上游水流中CPOM动态的影响：一种操纵方法

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There is concern about the ecological impacts that vast eucalyptus plantations in the Iberian Peninsula could have on streams, but the evidence so far gathered is far from conclusive. In an attempt to check the effects of eucalyptus plantations while reducing inter-stream variability, we performed a manipulative experiment. In each of two small headwater streams, two 50-m long reaches were covered with 1-mm, mesh net in order to exclude terrestrial inputs. We periodically added deciduous litter to the upstream reaches (deciduous treatments), and eucalyptus litter to the downstream ones (eucalyptus treatments), simulating the amount, composition and timing of inputs under both types of forest, and followed litter dynamics in the stream (inputs, storage and outputs). Two reaches further upstream were used as controls to evaluate the effect produced by the exclusion mesh. Inputs in eucalyptus plantations were more abundant but less diverse than deciduous ones, and were more evenly distributed throughout the year. Most deciduous inputs occurred in a single autumn pulse. Benthic litter storage was also higher in the eucalyptus treatments, but differences in litter export were small. Although leaf-litter decayed more slowly at eucalyptus reaches, net processing outputs were greater than at deciduous ones since eucalyptus leaves stayed in place for longer, because a larger fraction entered the stream during low flows. As a result, ecosystem efficiency in input use was higher in the eucalyptus treatments. In conclusion, our results confirmed previous findings that afforestation with eucalyptus produces noticeable changes in stream litter budgets.
机译：人们担心伊比利亚半岛的广大桉树人工林可能对河流产生生态影响，但迄今为止收集的证据远没有定论。为了尝试检查桉树人工林的影响，同时减少溪流间的变化，我们进行了操纵实​​验。在两条小源头水流中的每条中，两条50米长的河段被1毫米的网状网覆盖，以排除地面输入。我们定期将落叶凋落物添加到上游河段（落叶处理），将桉树凋落物添加到下游河床（桉树处理），模拟两种森林类型下投入物的数量，组成和时间，并跟踪溪流中的凋落物动态（投入物） ，存储和输出）。使用两个更上游的区域作为对照，以评估排除网格产生的效果。桉树人工林的投入比落叶林更为丰富，但差异不大，而且全年分布更均匀。多数落叶输入发生在单个秋季脉冲中。在桉树处理中，底栖垃圾的存储量也更高，但垃圾出口的差异很小。尽管落叶凋落物在桉树触角处腐烂的速度较慢，但​​净加工产量要比落叶落叶的净产量高，因为桉树叶的滞留时间更长，因为在低流量时有较大的一部分进入溪流。结果，在桉树处理中，投入使用中的生态系统效率更高。总而言之，我们的结果证实了先前的发现，即以桉树进行造林会使溪流垃圾的预算发生显着变化。

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