Understory vegetation as an indicator for floodplain forest restoration in the Mississippi River Alluvial Valley, U.S.A.
Understory vegetation as an indicator for floodplain forest restoration in the Mississippi River Alluvial Valley, U.S.A.
复制标题
林下植被作为美国密西西比河冲积河谷洪泛区森林恢复的指标
DOI：
10.1111/rec.12210
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发表时间：
2015
影响因子：
3.2
通讯作者：
Steven C. Hughes
中科院分区：
文献类型：
--
作者：
Diane De Steven;S. Faulkner;B. Keeland;M. Baldwin;J. McCoy;Steven C. Hughes
在密西西比河冲积谷（MAV），河流洪泛区水文的彻底改变使森林洼地广泛转变为集约化农业，导致近80%的森林损失。政府计划试图恢复森林栖息地和功能，在这个改变景观的方法植树造林（造林）和当地水文改良开垦耕地。早期的评估确定了影响种植加上树木殖民化是否可以建立类似于自然低地森林的上层群落的因素。在何种程度上造林网站开发典型的林下植被尚未得到评估，但林下植被组成可能是恢复现场条件的指示。作为一个广泛的研究的一部分，量化从恢复工作中获得的生态系统服务，林下植被进行了比较37个造林网站和26个成熟的森林网站。植被属性的物种生长形式，湿地指示类，和本地状态的差异进行了测试与单变量分析，植物区系组成数据进行了多变量技术分析。恢复地林下植被一般为水生植被，但由于演替年龄小，植物生长型的反应不同，物种组成与成熟滩地林不同。恢复地点之间的属性和植物区系的变化与冠层发育和当地湿度条件的变化有关，这反过来又反映了内在的网站功能和恢复措施的结果。因此，林下植被是一个有用的指标，在洪泛区森林恢复的功能进展。
In the Mississippi River Alluvial Valley (MAV), complete alteration of river‐floodplain hydrology allowed for widespread conversion of forested bottomlands to intensive agriculture, resulting in nearly 80% forest loss. Governmental programs have attempted to restore forest habitat and functions within this altered landscape by the methods of tree planting (afforestation) and local hydrologic enhancement on reclaimed croplands. Early assessments identified factors that influenced whether planting plus tree colonization could establish an overstory community similar to natural bottomland forests. The extent to which afforested sites develop typical understory vegetation has not been evaluated, yet understory composition may be indicative of restored site conditions. As part of a broad study quantifying the ecosystem services gained from restoration efforts, understory vegetation was compared between 37 afforested sites and 26 mature forest sites. Differences in vegetation attributes for species growth forms, wetland indicator classes, and native status were tested with univariate analyses; floristic composition data were analyzed by multivariate techniques. Understory vegetation of restoration sites was generally hydrophytic, but species composition differed from that of mature bottomland forest because of young successional age and differing responses of plant growth forms. Attribute and floristic variation among restoration sites was related to variation in canopy development and local wetness conditions, which in turn reflected both intrinsic site features and outcomes of restoration practices. Thus, understory vegetation is a useful indicator of functional progress in floodplain forest restoration.