Succession in AMF communities from early to late season in grassland national park
Change of AMF (arbuscular mycorrhizal fungi) community between two seasons in Grassland National Park had been studied in this article. We used FAMEs analysis and PCR-DGGE analysis tested soil samples collected from 3 different ecosystems at two sampling seasons. Based on our study, we found that AMF activity was significantly higher in early (wet) than late (dry) seasons, and in early season, the amount of AMF also showed significant positive linear relationship with amount of P and N in plant tissue. During late season we didn’t find significant result among these variables, which may suggest that seasonal changes could change the activity of AMF and affect relationship between AMF and their host plant nutrient metabolism. Also, AMF species composition differed in early and late season. Most AMF taxa found in the dry season in our study were unknown to the scientific community. This suggests that AMF biodiversity had difference between seasons and these uncommon AMF taxa are adapted to dry conditions. Besides, crested wheatgrass, the dominant species in the park, although didn’t show significantly directly relationship with AMF activity, it may improve soil organic carbon, soil soluble P, and increase the amount of soil bacteria, which are also three important factors that could further affect AMF activity. However, the absence of activity of crested wheatgrass combined with the low biodiversity in the stand and low association with AMF in the dry season, suggests that a prolonged drought period detrimental to crested wheatgrass would leave a prairie of crested wheatgrass vulnerable and depleted.
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