| 施氮对几种草地植物生物量及其分配的影响 |
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| 引用本文： | 祁瑜,黄永梅,王艳,赵杰,张景慧.施氮对几种草地植物生物量及其分配的影响[J].生态学报,2011,31(18):5121-5129. |
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| 作者姓名： | 祁瑜 黄永梅 王艳 赵杰 张景慧 |
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| 作者单位： | 地表过程与资源生态国家重点实验室,北京师范大学资源学院,北京,100875 |
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| 基金项目： | 国家自然科学基金资助项目(90711001,40871031) |
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| 摘 要： | 为了研究施氮对不同草地植物生物量及其分配的影响,以及温带草地生态系统碳交换过程对氮素的响应,在内蒙古太仆寺旗农田-草地生态系统野外站,以4种草地植物:紫花苜蓿(Medicago sativa L.)、高丹草(Sorghum bicolor L.) 、羊草(Leymus chinensis T.)和小叶锦鸡儿(Caragana microphylia L.)为材料,进行了3种氮素水平 的盆栽控制实验。研究结果表明:施氮显著促进了4种植物地上生物量的积累,紫花苜蓿在中氮水平地上生物量最大,较对照增加了24.8%,高丹草、羊草、小叶锦鸡儿在高氮水平地上生物量最大,分别较对照增加了45.6%、39.3%和72.2%。4种植物在中氮水平地下生物量最大,而细根(直径≤2mm)生物量随施氮量的增加显著减少。羊草根茎生物量及其分配比例随施氮量的增加而增大。施氮显著降低了4种植物的根冠比,紫花苜蓿的根冠比在中氮水平时最小,为1.62,高丹草、羊草、小叶锦鸡儿的根冠比在高氮水平时最小,分别为0.57、1.02和0.41。随施氮量的增加,植物地下部分特别是细根的分配比例显著降低,地上部分分配比例显著增加。不同植物对施氮水平的响应不同,相比豆科植物,施氮显著促进禾本科植物生物量积累,并使其生物量分配格局发生显著改变。
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| 关 键 词： | 氮素添加 草地植物种 生物量 生物量分配 |
| 收稿时间： | 7/5/2010 12:00:00 AM |
| 修稿时间： | 2011/4/26 0:00:00 |
Biomass and its allocation of four grassland species under different nitrogen levels |
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| QI Yu,HUANG Yongmei,WANG Yan,ZHAO Jie and ZHANG Jinghui.Biomass and its allocation of four grassland species under different nitrogen levels[J].Acta Ecologica Sinica,2011,31(18):5121-5129. |
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| Authors: | QI Yu HUANG Yongmei WANG Yan ZHAO Jie and ZHANG Jinghui |
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| Institution: | State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China |
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| Abstract: | In order to study the effects of nitrogen fertilizing on the biomass and its allocation of different grassland plants and thus on the carbon exchange in temperate grassland ecosystem,potted control experiments for four grassland species,i.e.Medicago sativa,Sorghum bicolor,Leymus chinensis,and Caragana microphylia,were conducted under three nitrogen levels,which were the control(CK) with no nitrogen addition,the medium(N1) with 30gN/m2 addition,and the high(N2) with 60gN/m2 addition,at Taipusiqi Grassland-Cr... |
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| Keywords: | nitrogen addition grassland species biomass biomass allocation |
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