EFFECTS OF ALUMINUM ON GROWTH AND NUTRIENT-UPTAKE OF SMALL PICEA-ABIES AND PINUS-SYLVESTRIS PLANTS
EFFECTS OF ALUMINUM ON GROWTH AND NUTRIENT-UPTAKE OF SMALL PICEA-ABIES AND PINUS-SYLVESTRIS PLANTS
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DOI：
10.1007/bf00204334
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发表时间：
1991-01-01
影响因子：
2.3
通讯作者：
ELDHUSET, TD
中科院分区：
文献类型：
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作者：
GORANSSON, A;ELDHUSET, TD
在pH 3.8+/-0.2条件下，研究了0.2~30 mM铝浓度对挪威云杉[(Picea abies(L.)Karst]、樟子松(Pinus cervestris L.)和侵染牛乳杆菌(SuillusBovinus(L.ex Fr.)·昆策等被调查过。这些植物以最大相对生长速率(R(G)%day-1)生长，可以自由进入，但外部营养浓度很低。在以AlCl3和/或Al(NO3)3形式添加铝之前，相对生长率(R(G))和内部营养浓度已达到稳定状态。当铝浓度分别为0.3 mm云杉、6 mm松树和10 mm生态菌根松时，R(G)降低，即铝浓度显著高于矿质土壤表层中通常发现最细根的水平。计算了不同营养元素的单位根的养分吸收速率和生长速率。0.2 mM(云杉)、1 mM(松树)和3 mM(外生菌根松)的铝浓度降低了云杉对钙和镁的吸收速率，但对R(G)无影响。这些结果对低浓度下铝对林木的毒性假说的正确性提出了质疑。
The effects of aluminium concentrations between 0.2 and 30 mM at pH 3.8 +/- 0.2 on small plants of Norway spruce [(Picea abies (L.) Karst], Scots pine (Pinus sylvestris L.), and Scots pine infected with the ectomycorrhizal fungus Suillus bovinus (L. ex Fr.) O. Kuntze were investigated. The plants were grown at maximum relative growth rate (R(G) % day-1) with free access but very low external concentrations of nutrients. Steady-state conditions with respect to relative growth rate (R(G)) and internal nutrient concentrations were achieved before addition of aluminium, which was addded as AlCl3 and/or Al(NO3)3. There were reductions in R(G) at aluminium concentrations of 0.3 mM in spruce, 6 mM in pine and 10 mM in ecotomycorrhizal pine, i.e. at aluminium concentrations considerably higher than those normally occurring in the top layer of the mineral soil where most fine roots are found. Nutrient uptake rate per unit root growth rate was calculated for different nutrient elements. The uptake rate of calcium and magnesium was reduced at aluminium concentrations of 0.2 mM (spruce), 1 mM (pine) and 3 mM (ectomycorrhizal pine), without influencing R(G). The results question the validity of the hypothesis of aluminium toxicity to forest tree species at low external concentrations.