Yingjun  Zhang, Hanshu  Zhou, Gaowen  Yang, 
    The Impact of Soil Available Phosphorus on the AM Fungi and the Organic Acids Exudation at Different Patches in Northern Steppe of China,
    Journal of Animal and Veterinary Advances,
    Volume 11,Issue 24,
    2012,
    Pages 4553-4558,
    ISSN 1680-5593,
    javaa.2012.4553.4558,
    (https://makhillpublications.co/view-article.php?doi=javaa.2012.4553.4558)
    Abstract: The research is conducted at a degraded steppe in Hebei province, 
  China. Researchers took four sample areas which are dominated by fringed sagebrush 
  (<I>Artemisia frigida</I>), narrowleaf stellera (<I>Stellera chamaejasme</I>), 
  shining speargrass (<I>Achnatherum splendens</I>), white swordflag (<I>Iris 
  lactea</I>), respectively. Phosphorus (P) was applied at four levels (0, 5, 
  10 and 15 mg kg<SUP>-1</SUP> soil) in each sample area. The AM fungi colonization 
  and the organic acid exudation in the rhizosphere were affected by the concentration 
  of soil available phosphorus. These results suggested that the difference of 
  soil P content is probably the cause of the appearance of four patches.
    Keywords: Phosphorus;arbuscular mycorrhizal fungi;organic acid;rhizosphere;grassland patches