| 石羊河上游退耕区紫花苜蓿草地群落动态特征 |
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| 引用本文： | 董小刚,赵成章.石羊河上游退耕区紫花苜蓿草地群落动态特征[J].干旱地区农业研究,2011,29(4):228-232. |
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| 作者姓名： | 董小刚 赵成章 |
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| 作者单位： | 西北师范大学地理与环境科学学院,甘肃,兰州7,30070 |
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| 基金项目： | 国家自然科学基金项目(40971039); 甘肃省科技支撑计划项目(1011FKCA157); 甘肃省高校基本科研业务费用 |
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| 摘 要： | 以石羊河上游旱泉沟流域紫花苜蓿人工草地为例,采用常规群落学调查,并结合2003～2009年连续7a的定位观测资料,研究了紫花苜蓿草地退化过程和群落动态特征.结果表明:紫花苜蓿人工草地建植以来,群落盖度逐年下降,群落密度逐年增大,地上部分生物量呈抛物线变化趋势;随着紫花苜蓿草地的退化,杂类草侵入群落,物种数由7种增加到1...
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| 关 键 词： | 紫花苜蓿 退耕地 群落动态 功能群 石羊河上游 |
Community dynamics of alfalfa grassland of abandoned lands in the upstream area of Shiyang Rive |
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| DONG Xiaogang,ZHAO Chengzhang.Community dynamics of alfalfa grassland of abandoned lands in the upstream area of Shiyang Rive[J].Agricultural Research in the Arid Areas,2011,29(4):228-232. |
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| Authors: | DONG Xiaogang ZHAO Chengzhang |
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| Institution: | DONG Xiao-gang,ZHAO Cheng-zhang(College of Geography and Environment Science,Northwest Normal University,Lanzhou,Gansu 730070,China) |
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| Abstract: | In order to study the degradation process and community dynamics of alfalfa(Medicago sailva) grassland in the alpine areas of NW China,we surveyed alfalfa grassland communities in the Hanquangou valley in the upstream area of the Shiyang River from 2003~2009.The results showed that,the community coverage decreased,the community density increased,the aboveground biomass varied with the single peak curve during planting the alfalfa.With the weeds invading grassland communities,the number of species increased ... |
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| Keywords: | alfalfa abandoned land community dynamics functional group upstream area of the Shiyang River |
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