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Effects of Groundwater Depth on the Growth and Chlorophyll Fluorescence Parameters of Phragmites australis(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2008年03期
Page:
91-95
Research Field:
生命科学
Publishing date:

Info

Title:
Effects of Groundwater Depth on the Growth and Chlorophyll Fluorescence Parameters of Phragmites australis
Author(s):
Liu Yu; Wang Guoxiang; Pan Guoquan
School of Geographical Science,Nanjing Normal University,Jiangsu Key Laboratory of Environmental Change and Ecological Construction,Nanjing 210046,China
Keywords:
P hragm ites australis;  groundwater dep th;  ch lorophy ll content;  ch lorophy ll fluorescence
PACS:
Q945
DOI:
-
Abstract:
E ffects of groundw ater depth on the g row th o fP hragm ites australis by sim ulating the littoral hydro log ical cond-i tions in the w etland were studied so that theoretica l foundations fo rw etland protec tion and vege tation restoration cou ld be supp lied. ThePhragm ites aus tralis rh izom es we re p lanted in the ba rre ls ( w ho se diam ete r is 35.5 cm and depth is 100 cm ) w ith r iver sands of 80 cm depth. Four trea tm en ts were se t as- 60 cm, - 40 cm, - 20 cm and 0 cm and three rep l-i ca tes we re set for each treatment. The resu lts we re as fo llow s: W hile groundwater depth decreases, p lant he ight and p lant inte rnode num ber decrease ve ry sign ificantly ( p < 0.01) and chlorophy ll content a lso decreases, ind icating that p lant decreases light capture by thew ay of m orpho log ical adjustm ent and ch lo rophyll content reduction. M ax ima l pho tochem ica l quantum y ie ld (Fv /Fm ), re lative photosynthe tic e lectron transport rate ( rETR ) and photochem ical quenching coe fficient ( qP ) positive ly correlate w ith groundwa ter depth and non-photochem ica l quench ing coe fficient ( qN ) negative ly co rre la tew ith g roundw ater depth. The - 60 cm trea tm ent beg ins to die on the 31st day, show ing that continuing low er groundwa ter depth makes PSⅡ destroyed, so that - 60 cm groundw ate r depth has neg ative effects on Phragm ites australis. As tim e goes by, plan t g row s and Fv /Fm, rETR and qP o f other trea tm en ts inc rease and qN decreases, but the g roup differences reduce wh ich indicate that the effects o f groundwa ter depth decrease.

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Last Update: 2013-05-05