Ensuring Soil Quality and Function in Wetland Creation and Restoration Efforts
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1 Ensuring Soil Quality and Function in Wetland Creation and Restoration Efforts W. Lee Daniels and many more from many places! Eric Stein, Principal Scientist, Southern California Coastal Water Research Project Jeremy Sueltenfuss, Colorado State University, Department of Forest and Rangeland Stewardship W. Lee Daniels, Thomas B. Hutcheson Professor of Environmental Soil Science at Virginia Tech Matt Schweisberg, Principal, Wetland Strategies and Solutions, LLC
2 Hydric Soils and Wetland Creation The definition of a hydric soil is: a soil that formed under conditions of saturation, flooding or ponding long enough during the growing season to develop anaerobic conditions in the upper part. 42p2_ Presumably, hydric soils are developing in wetland creation and restoration sites and are providing or supplementing numerous functions, including: N removal via denitrification and plant uptake P removal via sedimentation, plant uptake, etc. C sequestration via net OM accumulation Habitat provision for wetland flora, fauna, microbes, etc. This necessarily involve driving soil redox low enough to favor wetland obligates, etc. vs. upland species that want to invade.
3 High OM wetland soil at Sandy Bottom Nature Park in Hampton, VA. The A horizon here is over 30 cm thick. The annual hydroperiod of this soil fluctuates approximately 1.5 m! High O.M, friable, loamy; with B.D. < 1.3 in all A and B horizons. This is a mineral flat landscape.
4 Native hydric soil (Roanoke series) in a Carolina Bay (closed depression) landform. Very high clay, dense in Btg, and acidic. Not all hydric soils are pretty!
5 Spartina sp. tidal marsh vegetation on sound behind barrier island in Maryland.
6 Sulfidic peaty soil in a tidal marsh (Sulfihemists). Considerable and detailed work on tidal marsh soils has been done by Rabenhorst, Fanning, Stolt and others at the Universities of Maryland and Rhode Island.
7 Charles City Wetland (CCW); first built in 1997 & 1998 via excavation of upland landform; modified by VDOT several times thereafter.
8 Surface soil at CCW in 2002 after preliminary remediation efforts Note massive structure in surface breaking to firm plates at about 20 cm. This directly limits rooting, litter to soil incorporation, subsoil microbial biomass, and therefore redox process and associated development of features!
9 Common Limitations in Created / Restored Wetland Soils Compaction, compaction, compaction! Lower soil OM levels than natural sites/soils Lack of microtopography Degraded soil structure/permeability/rooting Higher soil temps when young, leading to higher C loss rates Often dissimilar in basic chemical and physical properties than native soils due to cut/fill processes during contstruction
10 High OM wetland soil at Sandy Bottom Nature Park in Hampton. The A horizon here is over 30 cm thick. The annual hydroperiod of this soil fluctuates approximately 1.5 m! High O.M, friable, loamy, and B.D. < 1.3 A and B horizons. This is a mineral flat landscape.
11 Sandy Bottom Natural Wetland Water Level (m) Precipitation (mm) Shallow Deep Precip /04/2004 0:00 04/14/2004 0:00 04/24/2004 0:00 05/04/2004 0:00 05/14/2004 0:00 05/24/2004 0: Time Shows that the two levels being measured are clearly connected. Note falling head with depth; indicative of GW recharge locally. Data from DesPres & Whittecar and DesPres M.S. thesis.
12 Sandy Bottom Wetland Sandy Bottom Wetland Rich Whittecar (hydrogeology), Jim Perry (ecology) and WLD on a cool day at Sandy Bottom. I can t express enough how valuable it is to have other disciplines involved with site assessments.
13 Sandy Bottom Constructed Wetland Shallow Intermediate Deep Precipitation Apr 5-Apr 6-Apr 8-Apr 9-Apr 10-Apr 12-Apr 13-Apr 14-Apr 16-Apr 17-Apr 18-Apr 20-Apr 21-Apr 22-Apr 24-Apr 25-Apr 26-Apr 28-Apr 29-Apr 30-Apr 2-May 3-May 4-May 6-May 7-May 8-May 10-May 11-May 12-May 14-May 15-May 16-May 18-May 19-May 20-May 22-May 23-May 24-May 26-May 27-May 28-May Same site x dates; nested piezometers in created wetland portion.
14 Cedar Run 3 and 4 Wetlands > 1000 ha created wetlands in region in Triassic geology Created Wetland Focus Area of Related VT Projects Sponsored by Piedmont Wetlands Research Program/WSSI. All in N. Virginia Triassic WSSI = Wetland Studies and Solutions Inc.
15 20 10 Hydroperiod in Cedar Run 3 created wetland. Red values are field measurements during ponded periods MS thesis by N. Troyer Global piezometer - 36cm RDS piezometer - 46cm USACOE Std. well - 46cm Precipitation events Water level depth (cm) Precipitation (cm) /01/11 05/01/11 07/01/11 09/01/11 11/01/11 01/01/12 03/01/12 05/01/12 07/01/12 09/01/12 11/01/12 01/01/13 Observation period
16 Local landform at Cedar Run 4 location #2. Soils are an intimate mixture of the somewhat poorly drained Rowland Soil Series (Fine-loamy, mixed, superactive, mesic Fluvaquentic Dystrudepts) and the poorly drained Bowmansville Soil Series (Fine-loamy, mixed, active, nonacid, mesic Fluventic Endoaquepts). Note: Local depressions were not sampled.
17 50 cm wells at Cedar Run 4 in native wetlands Rep1 Rep 2 8 Rep 3 Precipitation 7 Water level depth (cm) Precipitation (cm) /01/11 04/01/12 08/01/12 12/01/12 04/01/13 08/01/13 12/01/13 Observation period
18 Water Budgeting is Critical! One option is Wetbud, which is a design tool for wetland creation SWin Ppt E T Stream SWout GWin Soil Perm. (Ksat) GW flux modeled via Darcy flow approach assuming uphill head data available GWout
19 Site for Charles City Wetland (CCW) OM Loading rate experiment, first built in 1997 & 1998; modified by VDOT several times thereafter. How do we determine soil success?
20 Effects of Compost amendment on pedogenesis after 3 years 0 Mg/ha rate; Relict redox only 56 Mg/ha (25 T/ac; < 2.5% OM)
21 Long term effect of original compost loading (112 Mg/ha 50 T/ac) at CCW dry experiment Summer 2015.
22 Richmond WWB Earle Weanack/199 Wetland
23 Experimental area graded and flagged. Note uniform brown and oxidized sediment colors across the site.
24 Experimental area after hummock installation and application of topsoil. Picture shot 3 hours after adjacent high tide.
25 Distinct redox concentrations and depletions (F3; depleted matrix) formed in replaced upland topsoil within three years. Also note distinct band of concentrations at topsoil/sand contact.
26 Photo from 2009 of high compost addition treatment vs. original soil from berm. Soils in the creation site were evaluated for color and were similar.
27 Image of control plot soil (sand; fertilizer only) taken 11/8/15 10 years old. Note significant accumulation of OM in surface and low chroma below. Detailed study by Emily Ott (PhD student) & John Galbraith is ongoing.
28 Bald cypress in pit (left) vs. mound (right). Note other woody stems invading.
29 Avoid sulfidic materials at all costs! Mattaponi Wetland; bare ground in rear was ph 3.1 as is the wetland floor when it dries down in the summer. Around 25% of VDOT Coastal Plain sites hit sulfidic materials which will then require high liming rates, etc.
30 So, how do I determine hydric soil success? Learn how to accurately and completely describe soil morphology, particularly redox features! Carefully describe soil morphology (a) before any site disturbance and then (b) immediately after final creation/restoration. Quantify/count redox feature abundance; don t simply place them into classes (e.g. few vs. many). At a pre-determined interval (e.g. 1, 3 and 5 yr?), conduct follow-up soil descriptions on mini-pits excavated to 30 cm+ and carefully quantify color, redox feature abundance, etc. If the soil is moving in the right direction, you should be able to detect and quantify (a) development of lower overall chroma and (b) increased redox concentrations, pore linings, or other features.
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