| 科尔沁沙地沙质草地与固定沙丘植物群落结构对极端干旱的响应 |
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| 引用本文： | 孙一梅,田青,吕朋,郭爱霞,李平平,朱丽琴,左小安.科尔沁沙地沙质草地与固定沙丘植物群落结构对极端干旱的响应[J].中国沙漠,2021,41(1):129-136. |
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| 作者姓名： | 孙一梅 田青 吕朋 郭爱霞 李平平 朱丽琴 左小安 |
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| 作者单位： | 1.甘肃农业大学 林学院，甘肃 兰州 730070;2.中国科学院西北生态环境资源研究院 奈曼沙漠化研究站，甘肃 兰州 730000;3.中国科学院大学，北京 100049 |
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| 基金项目： | :国家自然科学基金项目(41622103,41571106);中国科学院青年创新促进会项目(1100000036);中国科学院大学生创新实践训练计划。 |
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| 摘 要： | 为了探究沙地植物群落结构特征对极端干旱的响应，通过野外模拟试验开展了极端干旱（生长季减雨60%与干旱60 d）对沙质草地和固定沙丘植物群落丰富度、地上生物量和叶性状等群落结构特征影响的研究。结果表明：（1）生境变化对植物群落地上生物量和叶干物质含量（LDMC）具有显著影响（P<0.05），草地地上生物量和LDMC显著高于固定沙丘，而物种数、植被盖度、高度和比叶面积（SLA）在两种生境间无显著差异（P>0.05）；（2）极端干旱处理显著影响沙地植物群落盖度、地上生物量和LDMC（P<0.05），减雨60%显著降低了植物群落盖度和地上生物量，而干旱60 d显著降低了植物群落盖度、地上生物量、高度和LDMC；植被特征和叶性状在减雨60%和干旱60 d处理间无显著差异（P>0.05）；（3）减雨60%和干旱60 d显著降低了草地和固定沙丘的植被盖度和地上生物量，而干旱60 d也降低了固定沙丘的植物高度和LDMC（P<0.05）；（4）相关分析表明，沙地植物群落地上生物量与盖度、高度和LDMC显著正相关（P<0.05）。极端干旱事件的发生会极大地改变沙地一年生为主的植物群落组成和功能，而沙地不同生境植被则通过改变植物群落组成、优势种及其关键性状的变化来适应极端干旱。
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| 关 键 词： | 极端干旱 生境类型 植被特征 叶性状 |
| 收稿时间： | 2020-03-09 |
| 修稿时间： | 2020-07-07 |
Response of structure of plant community to extreme drought in fixed dunes and grassland in the Horqin Sandy Land |
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| Sun Yimei,Tian Qing,Lv Peng,Guo Aixia,Li Pingping,Zhu Liqin,Zuo Xiaoan.Response of structure of plant community to extreme drought in fixed dunes and grassland in the Horqin Sandy Land[J].Journal of Desert Research,2021,41(1):129-136. |
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| Authors: | Sun Yimei Tian Qing Lv Peng Guo Aixia Li Pingping Zhu Liqin Zuo Xiaoan |
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| Institution: | 1.College of Forestry，Gansu Agricultural University，Lanzhou 730070，China;2.Naiman Desertification Research Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China;3.University of Chinese Academy of Sciences，Beijing 100049，China |
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| Abstract: | In order to investigate the response of structure of plant community to extreme drought in different habitats in sandy land,the effects of extreme drought(rain reduction 60%and 60 days drought in growing season)on vegetation community characteristics and leaf traits in sandy grassland and fixed dunes were studied.The results showed that:(1)Habitat change has a significant impact on the above-ground biomass and leaf dry matter content(LDMC)of plant communities(P<0.05).Above-ground biomass and LDMC in grasslands are significantly higher than in fixed dunes,while species numbers,vegetation coverage,height and specific leaf area(SLA)no significant difference between the two habitats(P>0.05);(2)Extreme drought treatment significantly affected plant community coverage,above-ground biomass,and LDMC(P<0.05),60%rainfall reduction significantly reduced plant community coverage and above-ground biomass,and 60 days of drought significantly reduced plant community coverage,above-ground biomass,height and LDMC;there were no significant differences in vegetation characteristics and traits between 60%rainfall reduction and 60 days drought treatment(P>0.05);(3)60%rainfall reduction and 60 days of drought significantly reduced the vegetation coverage and above-ground biomass of grassland and fixed dunes,and 60 days of drought also reduced the plant height and LDMC of fixed dunes(P<0.05);(4)Correlation analysis showed that above-ground biomass of sandy plant communities was significantly positively correlated with coverage,height,and LDMC(P<0.05).Vegetation in different habitats of sandy land adapts to extreme drought through changes in plant community composition,dominant species and their leaf dry matter content. |
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| Keywords: | extreme drought habitat types vegetation characteristics leaf traits |
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