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采用孔洞根系生长法 ,研究了土壤中不同形态铝含量的变化及对杉木、马尾松根系生长的影响。结果表明 :土壤中加入铝离子后 ,土壤pH下降 ,活性铝含量明显增加 ,孔洞中林木根系表现为明显的铝中毒症状 ;加入钙离子后 ,土壤pH升高 ,土壤中活性铝含量显著下降 ,根系生长得到改善 ;1a后 ,与原孔洞中土壤相比 ,土壤中总铝含量降低 ,交换态铝含量有所降低 ,腐殖质铝含量升高
Using hole root growth method, the changes of different forms of aluminum in soil and their effects on the growth of Chinese fir and masson pine roots were studied. The results showed that the soil pH decreased and the content of active aluminum increased obviously when aluminum ions were added into the soil. The root system of the forest showed obvious symptoms of aluminum poisoning in the holes. After adding calcium ions, the soil pH increased, the content of active aluminum in the soil decreased significantly, After 1 year, the content of total aluminum in the soil decreased, the content of exchangeable aluminum decreased and the content of aluminum in the humus increased