Stream Hydrology Reading

Stream Hydrology Reading - E:er Wetland Hydrotogy...

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Unformatted text preview: E:er Wetland Hydrotogy Hydrologic cond'itions a1e^extreruery iznportantfor., tlte rnaintenance of a wetland)s structut e arc.d. futt.ctiln fnef a6ert iany nb,ioti.c ?nr:r*, including soil nnaerob'iosis, nw*ient nvaitabitity, aid, i, ,orunt rritirii ,rr,inity. ,hese, in tuln, d'eterwine the biota tlr?t atiitop itt a wetland.. Finary, cornpleting tbe cvcle, biotic c,?np,nen' at'e active in aiering the wetrand hyd.rorogy and othe, physicochetni'calfeatwres. The hyd.roper,o,, oi hyrrrorogi, ,rgnrtr* of a wetrand, is the reswrt of tbe barance b.etweeniro1tow, nnd owtfrows of water (cailed. the wate, bwrlget), the weiland..basingeirnor\,horogy, iri ,nl iirr,face cond.itions. Tbe hydroperiod' can have d.rarnaTi, uaso'nrr in'd yeat -to-ye^-r'r:*irtio*r, yrt it retnnircs the ruajor d'eternoinant of wetran^.\t,otti^. lur"*rio"iro*porrrr, o7 a wetland)s water bwdget,inctud.i precipitaion, eunpotranspirat.ion, ouerbanh Jlood.ing irc riparian wetjand.l orir, ,rh?r* ftows, g:rownd.tiater fluxes, and ridrs or seiches tn ,,0:.rr:,wettands. si*pt, aiirr*ir^riirTirirttrd,operiod, water bwdget, nnd turnover tirne in witand. rtrAlo ,rr"r;";;;b';r, tu a bettet, , n d. e rst an d. i ng of w et ln d. ( n c ti o n. Hy dr o l ogy,6r r rr rp r r l r r' r-irnp o r,.ti o n aro d ,ichness, p,inoary productiuity, organii arrrtnwlition, ina ortrlrot cycting in wetland.' Ingeneral prod..uitbily is hi.gh in wetlanrlithr, irrribn ft o w - th r o wsh of w a t e r an d n wtri i n ts t i ;r r "i * i", iif i i"ii"i iy a, p r, ;, ar. Deconnposit'ion in wetrantrs is srower in anaerobic xand.iig wlaier"than it is tr'nd'er wet-dry conditi,ons. -attltltplt many wetrand.s exp,rt ,rg,nic carbon, this cq.nnlt be generalized even withii one witlnnd ty7,e. L -'a--"'t The hydrology of a wetrand creates the unique physiochemicar conditions thar i*,.:::n an ecosystem different from both wett-drained ,".r*.r"r systems and deepwater aquatic systems. Hydrologic pathways such as precipitation, surfhce runoff, E:oundwater, tides, and flooding ,ii.rr'trnnrport energy and nutrients to and from LO7 lt[L 1O8 Chapter 4 Wetland Hydrolo$/ wetlands. Water depth, flow patterns, and duration and frequency of flooding, r-h_;: are the result of all of the hydrologic inputs and outputs, influence the biochemistn :i the soils and are major factors in the ultimate selection of the biota of wetlands. Bi,-,; ranging from microbial communities to vegetation to waterfowl are all constraine d :: enhanced by hydrologic conditions. An importanr point about wedands-one r;: is often missed by ecologists who begin to study these systems-is this: Hydrololr, ,t probably the single vwlst implrta,nt d.eterwinnnt of the establishnoent and runintenn,;:: of specif.c types of wetland.s and. wetlnnd. pylcesses. An understanding of rudimenra:- hydrology should be in the repertoire of any wedand scientist....
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This note was uploaded on 01/23/2012 for the course BIOL/EVPP 350 taught by Professor Kimdemutsert during the Fall '11 term at George Mason.

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Stream Hydrology Reading - E:er Wetland Hydrotogy...

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