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首页> 外文期刊>Wetlands >THE IMPORTANCE OF HYDROLOGY IN RESTORATION OF BOTTOMLAND HARDWOOD WETLAND FUNCTIONS
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THE IMPORTANCE OF HYDROLOGY IN RESTORATION OF BOTTOMLAND HARDWOOD WETLAND FUNCTIONS

机译：水文学在恢复底特律硬木湿地功能中的重要性

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Bottomland hardwood (BLH) forests have important biogeochemical functions and it is well known that certain structural components, including pulsed hydrology, hydric soils, and hydrophytic vegetation, enhance these functions. It is unclear, however, how functions of restored BLH wetlands compare to mature, undisturbed wetlands. We measured a suite of structural and functional attributes in . replicated natural BLH wetlands (NAT), restored BLH wetlands with hydrology re-established (RWH), and restored BLH wetlands without hydrology re-established (RWOH) in this study. Trees were replanted in all restored wetlands at least four years prior to the study and those wetlands with hydrology re-established had flashboard risers placed in drainage ditches to allow seasonal surface flooding. Vegetation, soils, and selected biogeochemical functions were characterized at each site. There was a marked difference in woody vegetation among the wetlands that was due primarily to site age. There was also a difference in herbaceous vegetation among the restored sites that may have been related to differences in age or hydrology. Water table fluctuations of the RWH wetlands were comparable to those of the NAT wetlands. Thus, placing flashboard risers in existing drainage ditches, along with proper management, can produce a hydroperiod that is similar to that of a relatively undisturbed BLH. Average length of saturation within the upper 15 cm of soils was 37, 104, and 97 days for RWOH, RWH, and NAT, respectively. Soil moisture, denitrification potential, and soluble organic carbon concentrations differed among wetland sites, but soil carbon and nitrogen concentrations, heterotrophic microbial activity, and readily mineralizable carbon concentrations did not. Significant linear relationships were also found between soil moisture and heterotrophic microbial activity, readily mineralizable carbon, and soluble organic carbon. In addition, sedimentation rates were higher in NAT and RWH wetlands than in RWOH sites. Results of this study suggest that reconnection of bottomland hardwood wetlands to their surrounding watershed through the restoration of surface hydrology is necessary to restore wetland functions important to nutrient and sediment removal.
机译：Bottomland硬木（BLH）森林具有重要的生物地球化学功能，众所周知，某些结构组件（包括脉冲水文学，含水土壤和水生植物）增强了这些功能。但是，还不清楚恢复的BLH湿地的功能与成熟，未受干扰的湿地的功能如何。我们在中测量了一套结构和功能属性。复制自然BLH湿地（NAT），在恢复水文的情况下恢复BLH湿地（RWH），在没有水文学的情况下恢复BLH湿地（RWOH）。在研究开始至少四年之前，在所有恢复的湿地上重新植树，并在重建了水文学的湿地上将排水板竖板放置在排水沟中，以允许季节性地表洪水泛滥。在每个地点对植被，土壤和选定的生物地球化学功能进行了表征。湿地之间的木质植被存在显着差异，这主要是由于场地年龄所致。在恢复的地点之间，草木植被也存在差异，这可能与年龄或水文差异有关。 RWH湿地的水位波动与NAT湿地的水位波动相当。因此，在现有的排水沟中放置滑水板提升管，并进行适当的管理，会产生类似于相对不受干扰的BLH的水力周期。对于RWOH，RWH和NAT，土壤上部15 cm内的平均饱和长度分别为37、104和97天。湿地之间的土壤水分，反硝化潜力和可溶性有机碳浓度不同，但土壤碳和氮浓度，异养微生物活性和易于矿化的碳浓度没有差异。在土壤水分和异养微生物活性，易矿化碳和可溶性有机碳之间也发现了显着的线性关系。此外，NAT和RWH湿地的沉积速率高于RWOH站点。这项研究的结果表明，通过恢复地表水文学，将底层硬木湿地与其周围的流域重新连接对于恢复湿地对养分和沉积物去除至关重要的功能是必要的。

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