Evidence of sedimentation inequality along riparian areas colonised by Impatiens glandulifera (Himalayan balsam)
Evidence of sedimentation inequality along riparian areas colonised by Impatiens glandulifera (Himalayan balsam)
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DOI：
10.1111/wre.12397
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发表时间：
2020-02
期刊：
影响因子：
1.7
通讯作者：
P. Greenwood;A. Gange;N. Kuhn
中科院分区：
文献类型：
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作者：
P. Greenwood;A. Gange;N. Kuhn
测量了支持每年入侵杂草Impatiens glandulifera（喜马拉雅香脂）的河岸地区的土壤流失，并与附近记录的等效值进行了比较，地形相似的地区支持多年生植被超过7年的累积时间，沿着两个独立的河流系统的部分;一个在瑞士，一个在英国。从殖民地的位置土壤流失显着大于从参考位置在七个测量期间的四个。尽管对比结果，标准偏差，土壤流失和收益的基础上，主要是在两条河流在大多数监测期间的殖民地地区。这些研究结果表明，喜马拉雅凤仙花殖民地的地区经历了更高的沉积物通量相比，没有入侵的地区。在这里，我们通过使用更强大的不平等分析重新询问数据集来测试这些原始解释。对9个数据集进行了测试，其中5个（即56%）显示，喜马拉雅香脂入侵地区的沉积物通量明显大于参考地区。三个数据集显示入侵区和参考区之间的泥沙通量没有差异（33%），一个数据集（11%）显示参考区的泥沙通量较高。大多数结果支持我们原来的解释，并支持我们的假设，水媒可能决定殖民最初发生的地方，通过沉积喜马拉雅凤仙花种子在松弛或抑郁地区沿着河边缘。一旦喜马拉雅凤仙花建立起来，足够的多年生植被被取代，季节性死亡和植被覆盖的枯竭可能会增加一些地区将经历更高的沉积物通量的风险。
Soil loss from riparian areas supporting the annual invasive weed,Impatiens glandulifera(Himalayan balsam), was measured and compared with equivalent values recorded at nearby, topographically similar areas supporting perennial vegetation over a cumulative seven‐year period, along sections of two separate river systems; one in Switzerland, and one in the UK. Soil loss from colonised locations was significantly greater than from reference locations in four of the seven measurement periods. Despite contrasting results, standard deviations, based on soil losses and gains, were predominantly higher for colonised areas at both rivers over most monitoring periods. These findings indicated that areas colonised by Himalayan balsam experience higher sediment flux in comparison with areas free of invasion. Here, we test those original interpretations by reinterrogating the datasets using a more robust analysis of inequality. Nine datasets were tested, five of which (i.e. 56%) showed that sediment flux was significantly greater at Himalayan balsam‐invaded areas than at reference areas. Three datasets showed no difference in sediment flux between invaded and reference areas (33%), and one (11%) showed higher sediment flux at reference areas. Most results uphold our original interpretations and support our hypothesis that hydrochory probably dictates where colonisation initially occurs, by depositing Himalayan balsam seeds in slack or depressional areas along river margins. Once Himalayan balsam becomes established and sufficient perennial vegetation is displaced, seasonal die‐off and depleted vegetation cover may increase the risk that some areas will experience significantly higher sediment flux.