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中国沙漠 ›› 2001, Vol. 21 ›› Issue (3): 265-270.

• 研究论文 • 上一篇    下一篇

腾格里沙漠东南缘飞播区白沙蒿植被密度与土壤水分关系的研究

付华1,2, 周志宇1, 陈善科3   

  1. 1. 甘肃省草原生态研究所, 甘肃兰州 730020;
    2. 中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站, 甘肃兰州 730000;
    3. 内蒙古阿拉善盟草原工作站, 内蒙古巴彦浩特 750300
  • 收稿日期:2000-12-15 修回日期:2001-02-25 出版日期:2001-09-20 发布日期:2001-09-20
  • 作者简介:付华(1954-),女(汉族),山东枣庄市人,副研究员,主要从事草原生态研究工作。
  • 基金资助:
    国家自然科学基金重点项目(39730100);中国科学院沙坡头沙漠试验研究站基金资助

A Study on Relationship between Vegetation Density and Soil Water Content of Artemisia sphaerocephala Air-sown Grassland in South-eastern Edge of Tengger Desert, Inner Mongolia, China

FU Hua1,2, ZHOU Zhi-yu1, CHENG Shan-ke3   

  1. 1. Gansu Grassland Ecological Research Institute, Lanzhou 730020, China;
    2. Shapotou Desert Research & Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China;
    3. Grassland Station of Alxa Region, Bayanhot 750300, Inner Mongolia, China
  • Received:2000-12-15 Revised:2001-02-25 Online:2001-09-20 Published:2001-09-20

摘要: 对腾格里沙漠东南缘飞机播种区不同密度白沙蒿(Artemisia sphaerocephala Krasch)人工草地的土壤水分和植物生长状况进行研究。结果表明,白沙蒿密度在5.1~9株·m-2时,整个生长期土壤水分处于严重亏缺状态, 0~100 cm土层水分含量仅为0.55%~0.7%,白沙蒿死亡率高达55%~76.7%;密度在1.9株·m-2时,其土壤水分含量在0.65%~1.01%,白沙蒿死亡率为21.1%;密度在1.25株·m-2时,土壤水分在0.79%~1.48%,白沙蒿无一株死亡,且植株个体生长状况好于密度大样地,并有自繁育苗补偿,这表明研究区种植白沙蒿的适宜密度在1株·m-2左右。裸露沙地0~100 cm土壤含水量为1.3%~2.48%。

关键词: 腾格里沙漠, 土壤水分, 白沙蒿, 密度

Abstract: Relationships of soil water content and plant growth in Artemisia sphaerocephala air-sown grassland were studied in southeastern edge of Tengger desert. The results showed that when vegetation densities was 5.1~9 plant·m-2, soil water contents were only 0.55%~0.70% in 0~100 cm layer severely insufficient to need and plant mortality rates were as high as 55%~76. 7%; When vegetation density was 1.9 plant·m-2, soil water content were 0.65%~1.01% and plant mortality rate was 21.1%; However, when vegetation density was 1.25 plant·m-2, soil water contents were 0.79%~1.48%, no plant died, individual plant was growing better than those in high density field, and self-multiplied seedlings were growing under this condition. Therefore, the optimal density of Artemisia sphaerocephala was about 1.0 plant·m-2 in this area. The study also indicated that soil granule constituent and microbiotic soil-crust depth were affected by vegetation density greatly. Coarse sand con tents were respectively 37.0%, 25.8% and 16.3% in bare desert, middle vegetation density and high vegetation density, whereas the correspondent thick of crusts were 0, 1.1~1.2 and 1.4~1.7 cm. By contrast, soil water content was 1.3%~2.48% in bare desert.

Key words: Tengger desert, soil water content, Artemisia sphaerocephala, vegetation density

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