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首页> 外文学位 >THE ROLE OF EMERGENT MACROPHYTES TO NITROGEN AND PHOSPHORUS CYCLING IN A GREAT LAKES MARSH (PRODUCTION, NUTRIENT FLUX, DECOMPOSITION, WETLAND).
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THE ROLE OF EMERGENT MACROPHYTES TO NITROGEN AND PHOSPHORUS CYCLING IN A GREAT LAKES MARSH (PRODUCTION, NUTRIENT FLUX, DECOMPOSITION, WETLAND).

机译：新兴大生植物在一个大型湖泊沼泽（生产，营养通量，分解，湿地）中对氮和磷循环的作用。

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摘要

Marshes may function by regulating nutrient flux between many aquatic and terrestrial ecosystems. Few studies have quantified the cycling and storage of nitrogen and phosphorus in freshwater marshes. Plant nutrient uptake and litter mineralization are two of the primary mechanisms a wetland might control nutrient cycles and water quality. The importance of these processes relative to the total flux of nutrients through a wetland is rarely known. This study quantified the flux and retention of N and P through a marsh, and evaluated the role of emergent plants in controlling nutrient retention.; Hydrologic, non-gaseous N, and P mass balance data were developed from studies conducted at Pentwater Marsh, Pentwater Twp., MI USA (43(DEGREES) 46' N, 86(DEGREES) W). On an annual basis, about 10% of the inorganic-N inputs were removed by the marsh. An export of organic-N (27.6%) occurred, but organic-N export was not significantly greater than inorganic-N retention. Total-P and reactive-P were removed by the marsh (30.4% and 13.8% respectively). For both N and P, the greatest retention occurred during the growing season, suggesting biological control of removal processes.; Biomass production in 6 emergent and wet meadow communities (Sparganium eurycarpum, Scirpus validus, Typha latifolia, Calamagrostis canadensis, Carex stricta, and Carex aquatilis) was studied using harvest techniques. Tissue N and P concentrations and the biomass data were used to evaluate the role of vegetation in marsh nutrient cycles. Maximum shoot N content ranged from 4.8 g m('-2) to 7.9 g m('-2), and P content from 0.6 g m('-2) to 2.0 g m('-2). Average production and nutrient uptake rates were lower in the meadow than the emergent zone. Annually, only 2% of the N and 15% of the P inputs are accounted for in the August shoot biomass. However, shoot biomass could account for 25% of the inorganic-N and 59% of the total-P removed from the rivers.; N and P mineralization rates were greatest in the emergent zone. In emergent areas, as much as 88% of N and P in litter may be mineralized annually. Nutrient mineralization in the meadow zone can be only 20% that of the emergent zone.
机译：沼泽可以通过调节许多水生和陆地生态系统之间的养分通量来发挥作用。很少有研究量化淡水沼泽中氮和磷的循环和储存。植物养分吸收和凋落物矿化是湿地可能控制养分循环和水质的两个主要机制。这些过程相对于通过湿地的养分总量的重要性并不为人所知。这项研究量化了沼泽中N和P的通量和滞留量，并评估了新兴植物在控制养分保留方面的作用。水文，非气态氮和磷质量平衡数据是根据美国密歇根州彭特沃特水城彭特沃特沼泽（43（DEGREES）46'N，86（DEGREES）W）进行的研究得出的。每年，沼泽去除了约10％的无机氮输入。发生了有机氮的出口（27.6％），但有机氮的出口并未显着大于无机氮的保留。沼泽去除了总磷和反应性磷（分别为30.4％和13.8％）。对于氮和磷，最大的保留发生在生长季节，这表明对清除过程进行了生物控制。使用收获技术研究了6个新兴和湿润草甸群落（欧亚par草，Scirpus Validus，香蒲，香蒲，加拿大硬毛草和加水草）的生物量生产。组织中氮和磷的浓度以及生物量数据用于评估植被在沼泽养分循环中的作用。最大茎N含量范围从4.8 g m（'-2）到7.9 g m（'-2），P含量从0.6 g m（'-2）到2.0 g m（'-2）。草甸的平均产量和养分吸收率低于出苗区。每年8月的芽生物量中仅占N的2％和P的15％。然而，从河流中去除的枝条生物量可能占无机氮的25％，占总磷的59％。氮和磷的矿化率在出苗区最大。在紧急地区，垃圾中每年多达88％的N和P会矿化。草甸区的养分矿化度仅为出苗区的20％。

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  • 作者

    KELLEY, JAMES CLAYTON.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Biology Ecology.; Biology Limnology.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 185 p.
  • 总页数 185
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学（生物生态学）;
  • 关键词

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