LIMITING NUTRIENTS IN ACID-MIRE VEGETATION - PEAT AND PLANT ANALYSES AND EXPERIMENTS ON PLANT-RESPONSES TO ADDED NUTRIENTS

被引:34
作者
HAYATI, AA [1 ]
PROCTOR, MCF [1 ]
机构
[1] UNIV EXETER, DEPT BIOL SCI, HATHERLY LABS, EXETER EX4 4PS, ENGLAND
关键词
D O I
10.2307/2260785
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
(1) In pot experiments on a wet-heath peat from east Devon, Cirsium dissectum showed a strong positive response to lime but not to CaCl2, and to added P but not to N. Carex echinata responded strongly to lime, N and P. Neither species responded significantly to added K. (2) Peat samples were analysed from six sites in Devon: two lowland wet heaths (Ericion tetralicis), an upland blanket bog (Calluno-Sphagnion papillosi/Oxycocco-Ericion), and three upland poor-fens (Caricion nigrae). (3) Extractable amounts of the major cations were similar at the six sites, with somewhat higher levels of K in the wet heaths, Mg and Na in the blanket bog, and Ca in the poor-fens. The wet-heath sites were lowest in extractable NH4-N and P; the highest NH4-N values were in the poor-fens. (4) Total P was highest in the poor-fens; total Mn and Al were lowest in the blanket peat. C-N and C-P ratios were highest in the wet heath and blanket bog, and lowest in the poor-fens. (5) Plant analyses suggested greater availability of Fe and Mn in the wet heath and poor-fen sites, but otherwise did not closely reflect the peat analyses. (6) A factorial nutrient-addition experiment with Carex echinata grown on peats from the six sites showed that N and P were limiting growth on all six. N was more strongly limiting on the wet heath peats and P on the blanket bog. Both N and P appeared more freely available in the poor-fen peats. (7) K appeared to be in at least adequate supply in all but the blanket-bog peat; it showed no significant main-effect response, but there were significant interactions with N, P and Site. These suggest differences in processes of N supply and uptake in the wet heaths and blanket bog on the one hand, and the poor-fens on the other.
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页码:75 / 95
页数:21
相关论文
共 59 条
[1]  
[Anonymous], 1987, FLORA BRIT ISLES
[2]  
Armstrong W., 1982, ENV PLANT ECOLOGY, P290
[3]  
BELLAMY D, 1966, P ROY IRISH ACAD B, V65, P237
[4]  
BELLAMY DJ, 1968, 3RD P INT PEAT C QUE, P74
[5]   A COMPARATIVE-STUDY ON NUTRIENT CYCLING IN WET HEATHLAND ECOSYSTEMS .2. LITTER DECOMPOSITION AND NUTRIENT MINERALIZATION [J].
BERENDSE, F ;
BOBBINK, R ;
ROUWENHORST, G .
OECOLOGIA, 1989, 78 (03) :338-348
[6]  
Birse E. L., 1976, PLANT COMMUNITIES SO
[7]   MONTHLY DETERMINATIONS OF CONCENTRATIONS OF SODIUM, POTASSIUM, MAGNESIUM AND CALCIUM IN RAIN AND IN POOLS ON SILVER FLOWE NATIONAL NATURE RESERVE [J].
BOATMAN, DJ ;
HULME, PD ;
TOMLINSON, RW .
JOURNAL OF ECOLOGY, 1975, 63 (03) :903-912
[8]  
Bould C, 1983, DIAGNOSIS MINERAL DI
[9]   A MULTIPLE ION UPTAKE MODEL [J].
BOULDIN, DR .
JOURNAL OF SOIL SCIENCE, 1989, 40 (02) :309-319
[10]  
Brady N. C., 1984, The nature and properties of soils.