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生态学杂志 ›› 2021, Vol. 40 ›› Issue (8): 2400-2409.doi: 10.13292/j.1000-4890.202108.028

• 研究报告 • 上一篇    下一篇

短期氮添加对荒漠草原植物群落组成及稳定性的影响

张馨文1,安慧1*,刘小平2,文志林2,王波3,杜忠毓1   

  1. 1宁夏大学生态环境学院/西北土地退化与生态恢复省部共建国家重点实验室培育基地, 银川 750021;2盐池县草原实验站, 宁夏盐池 751506;3宁夏回族自治区草原工作站, 银川 750004)
  • 出版日期:2021-08-10 发布日期:2021-08-16

Effects of short-term nitrogen addition on plant community composition and stability of desert steppe.

ZHANG Xin-wen1, AN Hui1*, LIU Xiao-ping2, WEN Zhi-lin2, WANG Bo3, DU Zhong-yu1   

  1. (1College of Ecology and Environments, Ningxia University/Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan 750021, China; 2Grassland Experiment Station of Yanchi, Yanchi 751506, Ningxia, China; 3Grassland Station of Ningxia, Yinchuan 750004, China).  
  • Online:2021-08-10 Published:2021-08-16

摘要: 在宁夏荒漠草原开展短期氮添加实验,探究不同氮添加水平(0、5、10、20和40 g·m-2·a-1,分别表示为CK、N5、N10、N20和N40)对荒漠草原植物物种多样性、生物量及群落稳定性的影响。结果表明:短期氮添加处理显著影响了植物群落Shannon多样性指数、Patrick丰富度指数及群落盖度,而对Pielou均匀度指数无显著影响;N10处理下Shannon多样性指数、Patrick丰富度指数及群落盖度达最大值,分别为2.05、10及70.75%;N20处理下Pielou均匀度指数达最大值(0.92);短期氮添加显著增加了荒漠草原植物地上生物量、根系生物量及总生物量,显著降低了植物群落的根冠比;短期氮添加提高了植物群落稳定性,而当中量氮添加(N10)时,植物群落稳定性最强。荒漠草原植物群落组成及稳定性受到短期氮添加的影响,适量的氮添加可以增加植物物种多样性、生物量以及群落稳定性。

关键词: 荒漠草原, 氮添加, 物种多样性, 生物量, 群落稳定性

Abstract: We conducted a nitrogen addition experiment in a desert steppe of Ningxia, northwestern China, to explore the effects of different addition levels (0, 5, 10, 20 and 40 g·m-2·a-1, designated as CK, N5, N10, N20 and N40 respectively) on plant species diversity, biomass, and community stability. Shortterm nitrogen addition significantly affected Shannon diversity index, Patrick richness index, and community coverage, but did not affect Pielou evenness index. The values of Shannon diversity index, Patrick richness index and community coverage reached the maximum under the N10 treatment, which were 2.05, 10 and 70.75%, respectively. The Pielou evenness index reached the maximum (0.92) under the N20 treatment. Shortterm nitrogen addition significantly increased aboveground, belowground, and total biomass of desert steppe, but significantly reduced the roottoshoot ratio at community level. Shortterm nitrogen addition improved community stability of desert steppe, with higher community stability under medium nitrogen addition treatment (N10). Therefore, plant diversity, biomass and community stability could be increased by nitrogen addition with a proper level.

Key words: desert grassland, nitrogen addition, species diversity, biomass, community stability.