白桦、落叶松苗木的养分吸收动力学特征  

Nutrient Uptake Kinetics of Betula platyphylla and Larix olgensis Seedlings

作　　者：刘忠玲 王庆成[2] 张命军[3] 

机构地区：[1]黑龙江省林业科学研究所,哈尔滨150081 [2]东北林业大学 [3]松江河林业有限公司

出　　处：《东北林业大学学报》2014年第2期29-33,46,共6页Journal of Northeast Forestry University

基　　金："十二五"国家科技支撑计划项目(2012BAD21B02)

摘　　要：以白桦、落叶松播种苗为试验材料,采用水培养分耗竭法,对两树种苗木根系NO-3、NH+4、H2PO-4、K+吸收动力学进行了研究。结果表明:白桦苗木对NO-3、NH+4和H2PO-4的最大吸收速率小于落叶松,对K+的最大吸收速率大于落叶松。白桦对NH+4、H2PO-4、K+的亲和力大于落叶松,对NO-3的亲和力小于落叶松。白桦喜NO-3—N,落叶松喜NH+4—N,在两种氮素形态同时存在时,白桦对NO-3的最大吸收速率大于NH+4,落叶松相反。两树种混交有利于落叶松吸收土壤中的NO-3及白桦吸收土壤中K+;当土壤中NH+4和H2PO-4浓度较低时,有利于白桦吸收,浓度较高时有利于落叶松吸收,养分吸收差异可能对混交林中林木生长产生有益的作用。The nutrient absorption of N, P and K by roots of birch and larch seedlings was studied by hydroponic culture.Imax of NO-3 , NH＋4 and H2 PO-4 of birch seedlings are lower than those of larch, while K＋is higher.The Km of NH＋4 , H2 PO-4 and K＋in birch seedlings are more than those of larch, while NO-3 is less.Birch prefers NO-3-N, while larch prefers NH＋4-N. Imax of NO-3of birch is greater than that of NH＋4 , for larch it is opposite, when two nitrogen sources exist simultaneously. The different absorption capacity of N, P and K is benefit to uptake NO-3 for larch, while benefit to uptake K＋for birch in mixed forests.Birch prefers to uptake nutrient when NH＋4 and H2 PO-4 are in low content in the soil, for larch it is opposite. Differences in nutrients uptake can be benefit for the growth of both birch and larch in mixed forests.

关 键 词：白桦(Betulaplatyphylla) 长白落叶松(Larixolgensis) 养分 吸收动力学 

分 类 号：S725.2[农业科学—林木遗传育种]