Growth and photosynthetic performance of Phragmites australis in estuarine waters:: a field and experimental evaluation

被引:45
作者
Adams, JB [1 ]
Bate, GC [1 ]
机构
[1] Univ Port Elizabeth, Dept Bot, ZA-6000 Port Elizabeth, South Africa
关键词
growth; fluorescence; common reed; South Africa; estuary; salinity; Phragmites australis;
D O I
10.1016/S0304-3770(99)00063-7
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Surveys of South African estuaries showed that in estuaries that had a gradient of decreasing salinity up the length of the estuary salt marshes occurred near the saline middle-lower reaches and reeds and sedges in the brackish upper reaches. However, in certain estuaries common reed Phragmites australis occurred in the lower reaches of estuaries. The plants often extend into the intertidal zone where they are inundated with saline water (35 ppt). This study tested whether P. australis occurred at these sites because its roots were located in fresh or brackish water. In P. australis stands in the Goukou and Keurbooms estuaries interstitial water salinity was lower than surface water salinity. There was an increase in interstitial salinity towards the water's edge and this was associated with a decrease in the height of P. australis. Laboratory studies tested whether P. australis could survive tidal inundation with saline water (35 ppt) if its roots and rhizomes were located in freshwater (0 ppt). Plants which were supplied with freshwater to the roots but were tidally inundated with saline water had greater stem elongation and less dead leaves than plants that were supplied with 20 ppt salinity to the roots. P. australis will probably only survive intertidal flushing with saltwater if its roots and rhizomes are located in brackish water (<20 ppt). This accounts for the presence of P. australis in saline estuaries at the sites of freshwater seepage. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:359 / 367
页数:9
相关论文
共 20 条
[1]   THE DISTRIBUTION OF ESTUARINE MACROPHYTES IN RELATION TO FRESH-WATER [J].
ADAMS, JB ;
KNOOP, WT ;
BATE, GC .
BOTANICA MARINA, 1992, 35 (03) :215-226
[2]  
ADAMS JB, 1994, 292194 WAT RES COMM
[3]  
BENFIELD MC, 1984, THESIS U NATAL S AFR
[4]  
BIKOLAEVSKII VG, 1968, RASTIT RESUR, V4, P552
[5]   PHOTON YIELD OF O-2 EVOLUTION AND CHLOROPHYLL FLUORESCENCE CHARACTERISTICS AT 77-K AMONG VASCULAR PLANTS OF DIVERSE ORIGINS [J].
BJORKMAN, O ;
DEMMIG, B .
PLANTA, 1987, 170 (04) :489-504
[6]  
Burdick D.M., 1994, COMPARISON SALT MARS
[7]   Porewater chemistry associated with Phragmites and Spartina in a Connecticut tidal marsh [J].
Chambers, RM .
WETLANDS, 1997, 17 (03) :360-367
[8]  
Day J.H., 1981, P147
[9]  
GORDON-GRAY K D, 1971, Journal of South African Botany, V37, P1
[10]   GROWTH DYNAMICS AND SIZE STRUCTURE OF SHOOTS OF PHRAGMITES-AUSTRALIS, A CLONAL PLANT [J].
HARA, T ;
VANDERTOORN, J ;
MOOK, JH .
JOURNAL OF ECOLOGY, 1993, 81 (01) :47-60