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Effect of legacy on hydric forest structure in a subtropical urban watershed
Urban Ecosystems ( IF 2.5 ) Pub Date : 2020-06-10 , DOI: 10.1007/s11252-020-01009-y
John J. Lagrosa , Michael G. Andreu , Melissa H. Friedman , Wayne C. Zipperer , Robert J. Northrop

Hydric forest communities within the Tampa Bay Watershed were inventoried to assess the effect of urbanization on these systems. Based on aerial photography and site visits, 85 hydric plots were assigned a legacy class—remnant (forest, pre-1948), emergent (forest, post 1948), and managed (actively managed grass on plot). On each plot, diameter at breast height (dbh) and canopy width and species were recorded for trees ≥2.5 cm dbh. A hierarchical agglomerative cluster analysis identified community types within a legacy class and one-way AOV (α = .05) was used to compare structural features within and among legacy classes. Remnant plots (43 plots) were composed of six, natural community types as recognized by the Florida Natural Areas Inventory and no novel communities. Emergent plots (23 plots) were composed of four natural community types and one novel community. Managed plots (19 plots) contained only novel communities. Remnants had the highest species richness (41 species) and only one non-native species. Managed had the lowest species richness (33 species) but highest richness of non-native species (17). Remnant and emergent plots had similar densities for trees ≤32 cm dbh, (803 and 820 stems/ha, respectively), whereas managed plots had only 119 stems/ha. For trees >32 cm dbh, remnant plots had a significantly higher density (196 stems/ha) than emergent (99 stems/ha) and managed (40 stems/ha). These results suggest that legacy did not play a key role in differentiating between emergent and remnant plots but did play a key role in identifying managed plots.



中文翻译:

遗产对亚热带城市流域水文森林结构的影响

清查了坦帕湾流域内的热带森林群落,以评估城市化对这些系统的影响。根据航空摄影和实地考察,为85个水文地块分配了一个遗留类-残余物(1948年之前的森林),紧急情况(1948年后的森林)和管理(对地块进行有效管理的草地)。在每块土地上,记录≥2.5cm dbh的树木的胸高直径(dbh),冠层宽度和树种。分层的聚类聚类分析确定了遗留类别内的社区类型,并使用单向AOV(α= .05)来比较遗留类别内和遗留类别之间的结构特征。剩余的地块(43个地块)由佛罗里达自然区清单所识别的六种自然群落类型组成,没有新的群落。紧急地块(23个地块)由四种自然群落类型和一种新型群落组成。管理地块(19个地块)仅包含新社区。残留物的物种丰富度最高(41种),只有一种非本地物种。受管理的物种丰富度最低(33种),但非本地物种最高(17)。≤32 cm dbh的树木(分别为803和820茎/公顷)的树木的残留和紧急地块具有相似的密度,而管理地块只有119茎/公顷。对于> 32 cm dbh的树木,残留地块的密度(196茎/公顷)明显高于出苗地(99茎/公顷)和可管理的(40茎/公顷)。这些结果表明,遗留物在区分紧急地块和残余地块方面没有发挥关键作用,但在识别管理地块方面却发挥了关键作用。管理地块(19个地块)仅包含新社区。残留物的物种丰富度最高(41种),只有一种非本地物种。受管理的物种丰富度最低(33种),但非本地物种最高(17)。≤32 cm dbh的树木(分别为803和820茎/公顷)的树木的残留和紧急地块具有相似的密度,而管理地块只有119茎/公顷。对于> 32 cm dbh的树木,残留地块的密度(196茎/公顷)明显高于出苗地(99茎/公顷)和可管理的(40茎/公顷)。这些结果表明,遗留物在区分紧急地块和残余地块方面没有发挥关键作用,但在识别管理地块方面却发挥了关键作用。管理地块(19个地块)仅包含新社区。残留物的物种丰富度最高(41种),只有一种非本地物种。受管理的物种丰富度最低(33种),但非本地物种最高(17)。≤32 cm dbh的树木(分别为803和820茎/公顷)的树木的残留和紧急地块具有相似的密度,而管理地块只有119茎/公顷。对于> 32 cm dbh的树木,残留地块的密度(196茎/公顷)明显高于出苗地(99茎/公顷)和可管理的(40茎/公顷)。这些结果表明,遗留物在区分紧急地块和残余地块方面没有发挥关键作用,但在识别管理地块方面却发挥了关键作用。受管理的物种丰富度最低(33种),但非本地物种最高(17)。≤32 cm dbh的树木(分别为803和820茎/公顷)的树木的残留和紧急地块具有相似的密度,而管理地块只有119茎/公顷。对于> 32 cm dbh的树木,残留地块的密度(196茎/公顷)明显高于出苗地(99茎/公顷)和可管理的(40茎/公顷)。这些结果表明,遗留物在区分紧急地块和残余地块方面没有发挥关键作用,但在识别管理地块方面却发挥了关键作用。受管理的物种丰富度最低(33种),但非本地物种最高(17)。≤32 cm dbh的树木(分别为803和820茎/公顷)的树木的残留和紧急地块具有相似的密度,而管理地块只有119茎/公顷。对于> 32 cm dbh的树木,残留地块的密度(196茎/公顷)明显高于出苗地(99茎/公顷)和可管理的(40茎/公顷)。这些结果表明,遗留物在区分紧急地块和残余地块方面没有发挥关键作用,但在识别管理地块方面却发挥了关键作用。残留地块的密度(196茎/公顷)明显高于紧急地块(99茎/公顷)和可管理的(40茎/公顷)。这些结果表明,遗留物在区分紧急地块和残余地块方面没有发挥关键作用,但在识别管理地块方面却发挥了关键作用。残留地块的密度(196茎/公顷)明显高于紧急地块(99茎/公顷)和可管理的(40茎/公顷)。这些结果表明,遗留物在区分紧急地块和残余地块方面没有发挥关键作用,但在识别管理地块方面却发挥了关键作用。

更新日期:2020-06-10
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