Relationship between soil chemical factors and grassland diversity

被引:0
作者
F. Janssens
A. Peeters
J.R.B. Tallowin
J.P. Bakker
R.M. Bekker
F. Fillat
M.J.M. Oomes
机构
[1] UCL,Laboratoire d'Ecologie des Prairies
[2] Institute of Grassland and Environmental Research,Laboratory of Plant Ecology
[3] University of Groningen,undefined
[4] CSIC-lnstituto Pirenaico de Ecologia,undefined
[5] DLO-Research Instituto and Soil Fertility (AB-DLO),undefined
来源
Plant and Soil | 1998年 / 202卷
关键词
grassland; nitrogen; nutrient competition; phosphorus; plant diversity; potassium;
D O I
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中图分类号
学科分类号
摘要
Many studies carried out during these last few years have focused on the factors influencing plant diversity in species-rich grasslands. This is due to the fact that these ecosystems, among the most diversified in temperate climates, are extremely threatened; in some areas, they have almost disappeared. The re-establishment of these habitats implies to know the living conditions of the associations to be recreated. Very often, the typical species of these communities have become so rarefied that the seed bank or the seed rain are not sufficient to recreate the plant community. Most of the time, to achieve the restoration of these communities, they have to be totally recreated by sowing. For the restoration or the maintenance of the community, the soil chemical characteristics have also to be appropriate or if not modified. This research tends to establish a relation between some soil chemical factors and the plant diversity of a great number of stations. This research has illuminated the relationship between soil extractable phosphorus and potassium and plant diversity. Over 5 mg of phosphorus per 100 g of dry soil (acetate + EDTA extraction), no station containing more than 20 species per 100 m2 has been found. The highest number of species is found below the optimum content of the soil for plant nutrition (5–8 mg P/100 g). Concerning the potassium, the highest number of species is found at 20 mg/100, a value corresponcing to an optimum content of the soil for plant nutrition. High potassium contents, in opposition to phosphorus contents, are thus compatible with high values of diversity. Other factors (i.e. pH, organic matter, total nitrogen and calcium) do not show so clearly a relation with plant diversity. Excess of N–NO3 is known for its negative effect on the diversity of plant communities. In these environments, apart from the atmospheric deposits which can be important in some areas, N–NO3 is derived mainly from the symbiotic fixation of atmospheric nitrogen by legumes as well as from the mineralization of the organic matter of the soil. It is possible that, when in small quantities, the available soil phosphorus could be a limiting factor of the N–NO3 supply by these two sources. In this hypothesis, nitrogen would remain the main element limitating plant diversity but its availability would be controlled by phosphorus.
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页码:69 / 78
页数:9
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共 71 条
[1]  
Al-Mufti M. M.(1977)A quantitative analysis of shoot phenoiogy and dominance in herbaceous vegetation J Ecol. 65 759-791
[2]  
Sydes C. L.(1993)Nutrient limitations on microbial respiration in peat soils with different total phosphorus content Soil Bid. Biochem. 25 793-801
[3]  
Fumess S. B.(1992)Experiments on the restoration of species-rich meadows in the Netherlands Biological Conservation 62 59-65
[4]  
Grime J. P.(1991)Effects of nutrient enrichment in dutch chalk grassland J. Appl. Ecol. 28 28-41
[5]  
Band S. R.(1994)Does phosphorus supply enhance soil-N mineralization in Brazilian pastures? Eur. J. Agron. 3 339-345
[6]  
Amador J. A.(1988)Effect of grass competition, cutting frequency, and soil type on the phosphorus response of semi-natural populations of white clover NZ J. Agric. Res. 31 95-103
[7]  
Jones R. D.(1996)Influence of the N and P status of plant material and of added N and P on the mineralization of C from Biol Fertil. Soils 21 166-470
[8]  
Berendse F(1975)C-labelIed ryegrass in soil Pédologie 25 134-142
[9]  
Oomes M. J. M.(1995)Principles of soils and substrate analysis with regards to mobility of nutrient elements Acta Oecol. 16 687-702
[10]  
Altena H. J.(1996)Vegetation productivity and diversity of acid grasslands in nothern Greece as influenced by winter rainfall and limiting nutrients J. Veg. Sci. 7 29-40