Riparian trees resprout regardless of timing and severity of disturbance by coppicing

The purpose of the present study was to determine if riparian deforestation would expose lake surfaces to stronger winds and therefore bring about deepening of thermoclines and resulting habitat losses for cold stenotherms such as lake trout (Salvelinus namaycush). Removal of protective riparian trees through wind blowdown and two wildfires was found to triple the overwater windspeeds and produce thermocline deepening in two lakes at the Experimental Lakes Area. A survey of thermal stratification patterns in 63 northwestern Ontario lakes showed that lakes around which riparian trees had been removed a decade before through either clearcutting or by a wildfire were found to have thermocline depths over 2 m deeper per unit fetch length compared with lakes surrounded by mature forests. Riparian tree removal will therefore exacerbate hypolimnion habitat losses for cold stenotherms that have already been documented to be occurring as a result of lake acidification, eutrophication, and climate warming.

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LEAF LITTER DECOMPOSITION AND NUTRIENT EVALUATION OF THREE RIPARIAN TREES تحلل وتقييم المغذيات لمخلفات أوراق ثلاثة أنواع من الأشجار الشاطئية

Assiut University Bulletin for Environmental Researches ◽

10.21608/auber.2015.146273 ◽

2015 ◽

Vol 18.2 (18.2) ◽

pp. 18-43

Keyword(s):

Leaf Litter ◽

Litter Decomposition ◽

Leaf Litter Decomposition ◽

Riparian Trees

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Early Pleistocene climate changes in the central Mediterranean region as inferred from integrated pollen and planktonic foraminiferal stable isotope analyses

Quaternary Research ◽

10.1016/j.yqres.2006.11.001 ◽

2007 ◽

Vol 67 (2) ◽

pp. 264-274 ◽

Cited By ~ 40

Author(s):

Sébastien Joannin ◽

Frédéric Quillévéré ◽

Jean-Pierre Suc ◽

Christophe Lécuyer ◽

François Martineau

Keyword(s):

Mediterranean Region ◽

Climate Changes ◽

Environmental Changes ◽

Early Pleistocene ◽

Subtropical Climate ◽

Central Mediterranean ◽

Globigerina Bulloides ◽

Riparian Trees ◽

Pleistocene Climate ◽

Anoxic Events

AbstractVegetation inherited from a Pliocene subtropical climate evolved through obliquity oscillations and global cooling leading to modern conditions. An integrated, highly time-resolved record of pollen and stable isotopes (δ18O and δ13C of Globigerina bulloides) was obtained to understand vegetation responses to Early Pleistocene climate changes. Continental and marine responses are compared in the Central Mediterranean region with a particular consideration of environmental changes during anoxic events.Pollen data illustrate vegetation dynamics as follows: [1] development of mesothermic elements (warm and humid conditions); [2] expansion of mid- and high-altitude elements (cooler but still humid conditions); and [3] strengthening of steppe and herb elements (cooler and dry conditions). These successions correlate with precession. δ18O variations recorded by Globigerina bulloides define two cycles (MIS 43-40) related to obliquity. At northern low- to mid-latitudes, the pollen signal records temperature and wetness changes related to precession even during global climate changes induced by obliquity. This may result in unexpected increasing wetness during glacial periods, which has to be considered specific to the Central and Eastern Mediterranean region. Lastly, an analysis of anoxic events reveals that enhanced runoff is indicated by increasing frequency of the riparian trees Liquidambar and Zelkova.

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Stream Restoration for Legacy Sediments at Gramies Run, Maryland: Early Lessons from Implementation, Water Quality Monitoring, and Soil Health

Water ◽

10.3390/w12082164 ◽

2020 ◽

Vol 12 (8) ◽

pp. 2164

Author(s):

Katie Mattern ◽

Alyssa Lutgen ◽

Nathan Sienkiewicz ◽

Grant Jiang ◽

Jinjun Kan ◽

...

Keyword(s):

Water Quality ◽

Riparian Vegetation ◽

Stream Restoration ◽

Soil Health ◽

Water Quality Monitoring ◽

Quality Monitoring ◽

Nutrient Inputs ◽

Nitrogen And Phosphorus ◽

Partial Removal ◽

Riparian Trees

While stream restorations are increasingly being adopted to mitigate sediment and nutrient inputs and to meet water quality regulatory targets, less information is available on the drivers behind the design, implementation, effectiveness, and cost of restorations. We address these issues for a $4.2 million stream restoration for legacy sediments implemented for a rural Piedmont stream in Maryland, USA. A total of 1668 m of stream was restored in three phases, which included the partial removal of legacy sediments, the grading of streambanks, floodplain creation, channel reshaping with meanders and pool-riffle forms, the raising of the stream bed, and the planting of riparian vegetation. The sediment, nitrogen, and phosphorus concentrations and fluxes were monitored before- and during the restoration phases. The sites selected for restoration had legacy sediments vulnerable to erosion and were on state-owned land. The restoration design was based on the need to maintain mature riparian trees and preserve existing sensitive wetland habitats. Water quality monitoring indicated that the sediment and nutrient fluxes increased during the restoration phase and were attributed to disturbance associated with construction activities and increased runoff. We also recommend that soil health needs to be included as an integral component to enhance the effectiveness and resilience of stream restorations.

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Riparian trees as common denominators across the river flow spectrum: are ecophysiological methods useful tools in environmental flow assessments?

Water SA ◽

10.4314/wsa.v40i2.11 ◽

2014 ◽

Vol 40 (2) ◽

pp. 287 ◽

Cited By ~ 2

Author(s):

K Schachtschneider ◽

K Reinecke

Keyword(s):

River Flow ◽

Environmental Flow ◽

Riparian Trees

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Column experiments show that cycling of both nitrogen and phosphorus is altered by dissolved organic carbon in river sediments

10.5194/egusphere-egu21-14774 ◽

2021 ◽

Author(s):

Marc Stutter ◽

Daniel Graeber ◽

Gabriele Weigelhofer

Keyword(s):

Organic Carbon ◽

Nutrient Uptake ◽

Inorganic Nitrogen ◽

River Sediments ◽

P Uptake ◽

Controlled Study ◽

Column Experiments ◽

Nitrogen And Phosphorus ◽

Organic C ◽

Riparian Trees

Since agriculture and wider development have altered simultaneously runoff, pollution and natural structures in catchments (e.g. wetlands, floodplains, soil drainage, riparian trees) aquatic ecosystems deviate from background concentrations of N and P, but also organic C (OC). Hence mechanistic studies coupling OC, N and P are needed and whilst data coupling OC:N is becoming more available and interpreted this is not yet the case for aquatic OC:P.&#160; Column flow experiments (excluding light) allow preliminary controlled study of microbial biogeochemical processes in benthic sediments exposed to factorial nutrients (here +C, +NP, +CNP using simple dissolved substrates glucose, nitrate, and phosphate).Based on the stoichiometric theory, we tested the hypothesis that bioavailable DOC will stimulate the heterotrophic uptake of soluble reactive P (SRP) and dissolved inorganic nitrogen in stream sediments. Glucose-C additions increased nutrient uptake, but also NP additions enhanced consumption of native and added OC. The effects of C addition were stronger on N than P uptake, presumably because labile C stimulated both assimilation and denitrification, while adsorption (unaffected by the presence or not of OC) formed a part of P uptake. Internal biogeochemical cycling lessened net nutrient uptake due to N and P recycling into dissolved organically-complexed forms (DOP and DON).Simple column experiments point to mechanisms whereby availability of organic carbon can stimulate N and P sequestration in the bed of nutrient-polluted streams. This should promote further studies coupling OC with N and, especially P, towards better knowledge and ability to incorporate coupled macronutrient cycles into nutrient models and, potentially, ecosystem management.

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