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Willow-shrub encroachment affects physicochemical properties differently in two subtropical freshwater marshes
Wetlands Ecology and Management ( IF 1.8 ) Pub Date : 2020-01-08 , DOI: 10.1007/s11273-019-09705-z
Janet Ho , Lisa G. Chambers

Shrub encroachment has been increasing at unprecedented rates worldwide and a knowledge gap exists regarding how nutrient dynamics differ in shrub-encroached wetlands compared to marshes. This study evaluated physicochemical property differences in the soil, water, and vegetation of willow (Salix caroliniana) plots, marsh plots adjacent to willows, and control marsh plots in two wetlands within the St. John’s River watershed, FL. In both wetlands, Moccasin Island and Lake Apopka, willow leaves (484 ± 7 g kg−1) contained more carbon (C) than sawgrass (442 ± 3 g kg−1) and cattail (468 ± 4 g kg−1) leaves. At Moccasin Island, soil nutrient (C, nitrogen, phosphorous) concentrations were doubled in willow and adjacent plots compared to marsh plots, while 37% less soil C was observed in willow plots than marsh plots at Lake Apopka. These results demonstrate willow-encroached marshes have unique properties relative to non-encroached marshes, but the direction and magnitude of the differences are site-specific.

中文翻译:

柳灌木侵蚀在两个亚热带淡水沼泽中对理化性质的影响不同

灌木丛的入侵以前所未有的速度在全世界范围内增长,并且与灌木丛相比,在灌木丛侵蚀的湿地中养分动态差异方面存在知识鸿沟。这项研究评估了圣约翰河流域内两个湿地的柳树(Salix caroliniana)地块,柳树附近的沼泽地和对照沼泽地的土壤,水和植被的理化性质差异。在莫卡辛岛和阿波普卡湖这两个湿地中,柳叶(484±7 g kg -1)比锯草(442±3 g kg -1)和香蒲(468±4 g kg -1)含有更多的碳(C)。) 树叶。在莫卡辛岛,柳树和邻近地块的土壤养分(碳,氮,磷)浓度比沼泽地高一倍,而柳树地的土壤碳含量比阿波普卡湖沼泽地少37%。这些结果表明,相对于未入侵的沼泽地,柳树入侵的沼泽地具有独特的性质,但是差异的方向和大小是特定于地点的。
更新日期:2020-01-08
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