模拟氮、硫复合沉降对杉木幼龄林土壤交换性铝的影响  

Simulated study on the effect of nitrogen and sulfur deposited residue on the exchangeable AI-content soil for young Chinese fir growth

作　　者：张艳荷[1] 吕广林[1] 包和林[1] 侯丹[1] 洪伟[1] 范海兰[1] 吴承祯[1] 李键[1] 

机构地区：[1]福建省高校森林生态系统过程与经营重点实验室,福建农林大学林学院,森林生态研究所,福州350002

出　　处：《安全与环境学报》2009年第4期80-84,共5页Journal of Safety and Environment

基　　金：教育部博士点学科专项基金项目(200803890010)

摘　　要：采用二次正交回归旋转设计,研究了杉木人工幼龄林土壤交换性铝含量与氮、硫沉降之间的关系并建立模型。根据福建氮、硫沉降量及临界水平和森林容纳量确定模拟沉降量,氮沉降量分别为0k/(hm^2·a)、20 kg/(hm^2·a)、70 kg/(hm^2·a)、120 kg/(hm^2·a)、140kg/(hm^2·a),硫沉降量分别0 kg/(hm^2·a)、6 kg/(hm^2·a)、22kg/(hm^2·a)、38 kg/(hm^2·a)、44 kg/(hm^2·a)。结果表明,土壤交换性铝含量随着土层的加深没有显著差异。在试验初期,氮、硫沉降对土壤交换性铝的影响不显著,处理6个月后,氮、硫沉降显著活化土壤交换性铝(p<0.05)。对杉木林土壤交换性铝的增效作用中,氮沉降占有较大的贡献率;氮、硫沉降无明显交互作用。0～20 cm土层受氮、硫沉降影响最明显,中硫沉降处理和高硫沉降处理的土壤交换性铝含量分别比无硫处理高2.68%和3.53%,中氮沉降处理和高氮沉降处理分别比无氮处理高6.56%和8.22%。氮、硫沉降量大于120 kg/(hm^2·a)和38 kg/(hm^2·a)后,氮、硫沉降对铝含量作用由促进转为抑制。The paper is engaged in a simulated study on the effect of nitrogen and sulfur deposited residue on the exchangeable al-content soil for the young Chinese fir growth by means of the quadratic rotationorthogonal combination design. For this purpose, we have first of all established a relationship regression model for the soil exchangeable aluminum and N and S deposition. According to the nitrogen and sulfur deposition statistical data in Fujian that has been provided by the departments concerned, the critical levels of the nitrogen and sulfur for woods and forests sustaining capacity were respectively 0 kg/（hm^2·a）, 20 kg/（hm^2·a）, 70 kg/（hm^2·a）, 120 kg/（hm^2·a）, 140 kg/（hm^2·a） with those of sulfur deposition being respectively 0 kg/（hm^2·a）, 6 kg/（hm^2·a）, 22 kg/（hm^2·a）, 38 kg/（hm^2·a）, 44 kg/（ hm^2·a）. The experimental results we have gained indicate that there were no significant differences for all the soil layers. However, although no significant difference was found at the first stage, the situation would be various six months later. Actually, nitrogen deposition tends to contribute more to the effect of the enhanced activity of N-deposition （p 〈 0.05） whereas no significant interaction was found between nitrogen and sulfur deposition. The most significant elfeet of nitrogen and sulfur deposition to soil exchangeable aluminum was found in the 0 - 20 em soil layer with the exchangeable aluminum amount standing between with the sulfur deposition being greater than zero sulfur deposition. The effect of nitrogen and sulfur deposition on the concentration of aluminum was found from promotion to inhabitation while the nitrogen and sulfur deposition amounts were found bigger than 38 kg/（hm^2·a） and 120 kg/（hm^2·a）.

关 键 词：土壤学 氮 硫复合沉降 土壤交换性铝 杉木幼龄林 二次回归旋转设计 

分 类 号：S714[农业科学—林学]