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生态学杂志 ›› 2011, Vol. 30 ›› Issue (11): 2432-2436.

• 研究报告 • 上一篇    下一篇

红砂灌丛对土壤和草本植物特征的影响

何玉惠**,刘新平,谢忠奎   

  1. 中国科学院寒区旱区环境与工程研究所, 兰州 730000
  • 出版日期:2011-11-08 发布日期:2011-11-08

Effects of Reaumuria soongorica on its underlying soil properties and herb plant characteristics.

HE Yu-hui**, LIU Xin-ping, XIE Zhong-kui   

  1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Online:2011-11-08 Published:2011-11-08

摘要: 研究了黄土高原西部荒漠草原区天然红砂灌丛内外土壤水分、养分的差异及植物萌动期红砂灌丛对草本植物生长和植被组成的影响。结果表明:红砂灌丛下土壤水分状况明显好于灌丛外空地,尤其是在30~110 cm土层最为显著;灌丛内土壤粘粒和粉粒含量明显高于灌丛外,而沙粒含量低于灌丛外,尤其是0~10 cm土层;土壤有机质、全效氮、磷、钾及速效氮、磷、钾均在灌丛下富集,富集率分别达到1.40、1.25、1.04、1.05、1.37、1.77和1.49;从灌丛内到灌丛外草本植物的盖度和高度逐渐减小,而植物丰富度增大;红砂灌丛对草本植物密度、盖度和高度的相互作用强度均呈现正值,而植物丰富度的相互作用强度为负值。说明红砂灌丛具有明显的沃岛效应,并对草本植物的生长有促进作用。

关键词: 土地利用, 景观多样性, 动态, 黄土高原

Abstract: This paper studied the differences of soil moisture and nutrients under shrub canopy and in open space as well as the effects of Reaumuria soongorica during its germination on the herb growth and vegetation composition in desert grassland of western Loess Plateau. Under shrub canopy, the soil water regime, especially in 30-110 cm layer, was better, and the soil silt and clay contents, especially in 0-10 cm layer, were much higher while the soil sand content was lower, as compared with those in open space. The soil organic matter, total N, P, and K, and available N, P, and K were more enriched under shrub canopy, with the enrichment rate being 1.40, 1.25, 1.04, 1.05, 1.37, 1.77, and 1.49, respectively. From shrub canopy to open space, the herb plant coverage and height decreased, while the species richness increased. The relative interactive intensity of R. soongorica to herb plants density, coverage, and height were positive, whereas to herb plants species richness was negative. These results suggested that shrub R. soongorica had obvious “fertile island” effect, and had promotion effect on the growth of underlying herb plants.

Key words: Loess Plateau, Land use, Landscape diversity, Dynamics