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小钻杨和刺槐根系养分吸收的动力学研究
引用本文:翟明普,蒋三乃.小钻杨和刺槐根系养分吸收的动力学研究[J].北京林业大学学报,2006,28(2):29-33.
作者姓名:翟明普  蒋三乃
作者单位:1.1 河北农业大学园林与旅游学院2 中国林业科学研究院森林生态环境与保护研究所3 新疆林业科学院
基金项目:中国科学院资助项目 , 广东省博士启动基金
摘    要:该文用动力学方法研究了小钻杨和刺槐根系对N、P、K营养元素的吸收. 结果表明:①NH+4离子与小钻杨根系的亲和力比与刺槐根系的亲和力小,NH+4离子流入小钻杨根系的速率也比流入刺槐根系的速率慢;小钻杨根系吸收NH4+离子的最大吸收速率大于刺槐根系;小钻杨对NH+4离子的耐贫瘠能力和吸收NH+4离子能力较刺槐强. ②H2PO-4离子流入刺槐根系的速率大于小钻杨根系;刺槐根系对H2PO4-离子的耐贫瘠能力比小钻杨强. ③小钻杨和刺槐虽然在吸收K+离子的动力学特性方面有些差异,但两者混栽时不会存在对K+离子的竞争现象. 从养分吸收特性的角度来看,小钻杨与刺槐之间存在N、P养分互补协调的关系. 

关 键 词:刺槐    小钻杨    养分    动力学    根系
文章编号:1000-1522(2006)02-0029-05
收稿时间:1900-01-01
修稿时间:2004年12月10日

Dynamics of nutrient absorption in root systems of Populus×xiao zhuanica and Robinia pseudoacacia
ZHAI Ming-pu,JIANG San-nai.Dynamics of nutrient absorption in root systems of Populus×xiao zhuanica and Robinia pseudoacacia[J].Journal of Beijing Forestry University,2006,28(2):29-33.
Authors:ZHAI Ming-pu  JIANG San-nai
Institution:1 Key Laboratory for Silviculture and Conservation, Ministry of Education, College of Resources and Environment, Beijing Forestry University, 100083,P.R.China; 2 Department of Silviculture, State Forestry Administration, Beijing, 100714, P.R. China.
Abstract:The nutrient absorption of N, P and K in root systems of Populus×xiaozhuanica and Robinia pseudoacacia is analysed by a dynamic methodology. The results show that: 1) NH4+affinity for Populus×xiaozhuanica is weaker than that for Robinia pseudoacacia; the rate of NH4+ flowing into Populus×xiaozhuanica is slower than that flowing into Robinia pseudoacacia; the maximum absorption rate of NH4+ by the root system of Populus×xiaozhuanica is much higher than that of Robinia pseudoacacia; compared with Robinia pseudoacacia, Populus×xiaozhuanica has a stronger absorbency for and resistance to a deficiency in NH+4. 2) the rate of H2PO4- flowing into Robinia pseudoacacia is higher than that of Populus×xiaozhuanica; Robinia pseudoacacia has a stronger H2PO4- deficiency resistance than Populus×xiaozhuanica. 3) although differences exist between Populus×xiaozhuanica and Robinia pseudoacacia in the dynamic characteristics of the ability to absorb K+, competition does not occur when the two species are planted together. Populus×xiaozhuanica and Robinia pseudoacacia share a complementary and harmonious relation in the absorption of N and P nutrient elements.
Keywords:Robinia pseudoacacia L    pulus×xiaozhuanica W  Y  Hsu et Liang  nutrient  dynamics  root system
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