摘要： 为了解红壤改变土壤环境的能力,对不同CaCO₃浓度施入铁肥下樟树幼苗营养因素及其立地红壤的养分变化做了研究.结果表明,不同CaCO₃浓度下红壤pH值、水解氮、有效磷、速效钾、有效钙和有效镁均有所增加,减少了有机质、有效铁、有效锰、有效铜和有效锌浓度;不同CaCO₃浓度下各土壤因子规律性较强,有效铁、有效锰、有效铜与有效锌,有效磷、有效钙与有效镁,水解氮与速效钾变化规律均一致;pH值、有效磷、速效钾、有效钙和有效镁与有效铁之间表现为拮抗作用,有机质、水解氮、有效锰、有效铜和有效锌与有效铁之间表现为增效作用;随CaCO₃浓度增加樟树幼苗地上部和根部含铁锰锌量呈下降趋势,地上部、根部和植株的鲜质量干质量、鲜基干基的根冠比均呈先增加后减少的趋势,地上部、根部和植株的含水量呈先降低后增加的趋势.试验证明,红壤是很好的酸性介质材料,可以局部改变土壤环境,缓冲低浓度CaCO₃,促进根部的生长,从而有利于根系对营养成分的吸收,保证樟树幼苗的正常生长,但随着CaCO₃浓度的继续增加,就会对根部起抑制作用,影响樟树幼苗的生长.

关键词: 樟树, 红壤, CaCO₃

Abstract: In order to understand the capability that red soil change the environment in the soil,the main red soil factors and nutrition factors of camphor-tree seedlings were investigated after applying different calcium carbonate concentrations into Fe fertilizer in red soil.Results indicated that the application of different calcium carbonate concentrations increased soil pH value,hydrolysable N,available P,readily available K,available Ca and available Mg contents;but other soil factor contents reduced.Rule of soil factor contents were evident in different calcium carbonate concentrations.Available Fe,available Mn,available Cu and available Zn contents;available P,available Ca and available Mg contents;readily available K and hydrolysable N contents were the same.pH value,available P,readily available K,available Ca and available Mg contents were antagonistic to available Fe content,while organic matter,hydrolysable N,available Mn,available Cu and available Zn contents were synergistic to available Fe content.Meanwhile,with the increase of calcium carbonate concentration,total Fe,total Mn and total Zn contents of shoot and root of camphor-tree seedlings were reduced;fresh and dry weight of shoot,root and plant,and root shoot ratio of fresh and dry condition were enhanced first and then declined;water contents of shoot,root and plant were reduced first and then raised.Red soil is good acidic media materials,and can change the soil environment locally,buffer low carbonate calcium concentrations and promote the growth of the root.It is conducive for the root to absorb nutrient factors,so it can guarantee the normal growth of camphor-tree seedlings.With the increasement of calcium carbonate concentration,it will inhibit the activity of the root and affect the growth of camphor-tree seedlings.

Key words: Camphor-tree, Red soil, Calcium carbonate

中图分类号: 

• S143

• S792.23