Dynamics of arbuscular mycorrhizal fungi associated with desert ephemeral plants in Gurbantunggut Desert  

作　　者：Tao ZHANG ChangYan TIAN Yu SUN DengSha BAI Gu FENG 

机构地区：[1]College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China [2]Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China [3]Institute of Crop Tillage and Cultivation, Heilongjiang Academy of Agricultural Sciences, Harbin 150030, China [4]Institute of Nuclear and Biotechnology, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China

出　　处：《Journal of Arid Land》2012年第1期43-51,共9页干旱区科学（英文版）

基　　金：funded by the National Natural Science Foundation of China (30770341);the International Fund for Agricultural Development (the WATERCOPE project,I-R-1284)

摘　　要：Previous studies documented that most desert plants can be colonized by arbuscular mycorrhizal （AM） fungi, however, little is known about how the dynamics of AM fungi are related to ephemerals in desert ecosystems. The dynamics of AM fungi with desert ephemerals were examined to determine the effects of host plant life stages on the development of AM fungi. Mean colonization of ephemeral annual plants was 45% lower than that of ephemeral perennial plants. The colonizations were much higher in the early part of the growing season than in later parts, peaking at flowering times. The phenology of AM fungi in root systems varied among different ephem- erals. The density of AM fungal spores increased with the development of ephemeral annual plants, reached its maximum at flowering times, and then plateaued about 20 days after the aboveground senescence. A significant positive correlation was found between AM fungi spore density and biomass of ephemeral annual plants. The life cycles of AM fungi associated with desert ephemerals were very shod, being about 60-70 days. Soil temperature and water content had no direct influence on the development of AM fungal spores. We concluded that the development of AM fungi was in response to desert ephemeral phenology and life history strategy.Previous studies documented that most desert plants can be colonized by arbuscular mycorrhizal （AM） fungi, however, little is known about how the dynamics of AM fungi are related to ephemerals in desert ecosystems. The dynamics of AM fungi with desert ephemerals were examined to determine the effects of host plant life stages on the development of AM fungi. Mean colonization of ephemeral annual plants was 45% lower than that of ephemeral perennial plants. The colonizations were much higher in the early part of the growing season than in later parts, peaking at flowering times. The phenology of AM fungi in root systems varied among different ephem- erals. The density of AM fungal spores increased with the development of ephemeral annual plants, reached its maximum at flowering times, and then plateaued about 20 days after the aboveground senescence. A significant positive correlation was found between AM fungi spore density and biomass of ephemeral annual plants. The life cycles of AM fungi associated with desert ephemerals were very shod, being about 60-70 days. Soil temperature and water content had no direct influence on the development of AM fungal spores. We concluded that the development of AM fungi was in response to desert ephemeral phenology and life history strategy.

关 键 词：arbuscular mycorrhizal fungi Gurbantunggut Desert ephemeral annual plants ephemeral perennial plants DYNAMICS PHENOLOGY mycorrhizal colonization spore density 

分 类 号：S433[农业科学—农业昆虫与害虫防治] P941.73[农业科学—植物保护]