氮锌硒肥配合施用对白三叶的固氮作用与氮转移的影响  

Effect of application of nitrogen, zinc and selenium on fixation of nitrogen and transfer of nitrogen fixed in white clover

作　　者：华珞[1] 韦东普 白玲玉[2] 姚允寅[2] 

机构地区：[1]首都师范大学地理系,北京100037 [2]中国农业科学院原子能利用研究所,北京100094

出　　处：《生态学报》2001年第4期588-592,共5页Acta Ecologica Sinica

基　　金：国家自然科学基金!项目 (批准号 :39870 1 2 7)

摘　　要：在湖北省宜昌县百里荒草场山地黄棕壤上配合施用氮锌硒肥 ,研究其对混播白三叶、混播黑麦草及单播黑麦草的干重及混播白三叶的固氮作用和氮转移的影响。试验结果表明 :1氮锌硒肥配合施用 ,混播黑麦草的干重均高于相应处理的单播黑麦草 ,混播牧草和单播黑麦草干重最高的处理都是 N4 6Zn0 Se5,其干重分别为 2 5.38g/盆和 1 9.93g/盆。 2施氮对混播白三叶、混播黑麦草及单播黑麦草的生长有明显的促进作用 ,施锌、硒对混播白三叶、混播黑麦草及单播黑麦草的生长作用不明显。 3混播白三叶氮素的主要来源是固氮作用 ,占全氮产量的 57.60 0 %～ 77.2 58%。 4混播白三叶固定氮的转移量只占混播黑麦草的全氮产量的 0 .31 6%～ 1 2 .2 51 % ,通过正交方差分析发现 ,适量氮肥 ( N30 mg/ kg)促进固定氮的转移 ,高量氮肥 ( N4 6mg/ kg)抑制固定氮的转移。A pot experiment was carried out to study the effects of combined applications of nitrogen, zinc and selenium fertilizer on dry weight of herbage, nitrogen fixation and transfer of nitrogen from white clover to ryegrass in mixed culture in a mountain yellowbrown soil. The results showed as follows: (1) Dry weight of ryegrass in mixed culture was higher than that of ryegrass in mono culture; Dry weight of both herbage in mixed culture and ryegrass in mono culture in treatment of N46Zn0Se5 were the highest, with the value of 25.38g/pot and 19.93g/pot, respectively. (2) The growth of herbage was improved by nitrogen application, but was not affected by zinc, selenium application. (3) The nitrogen of white clover in mixed culture from nitrogen fixation ranged from 57.600%～77.528%. (4) Transfer of nitrogen from white clover to ryegrass in mixed culture was 0.316%～12.251%.

关 键 词：氮肥 锌肥 硒肥 配合施肥 生物固氮 氮转移 白三叶 草地 

分 类 号：Q945.1[生物学—植物学]