Response of root morphology traits to freezing and thawing process in an alpine steppe of the Northern Tibetan Plateau

Aims: There is compelling evidence from experiments and observations that the soil environment in the non-growing season influences vegetation in alpine regions. The differences of response to freeze-thaw process among alpine species of root traits such as morphology and anatomical are still lacking. Methods We measured functional root traits of six species by digging and growth chambers over freezing and thawing periods in a semi-arid steppe environment on the Tibetan Plateau. Results The uniformity of root traits was more obvious in spring than that in late autumn. Most importantly, fine-and shallow-root presented acquisitive syndromes in spring. Root morphological and anatomical traits affect freeze-thaw cycles by influencing root water and nutrient uptake. Conclusions In consistent with traditional views on the acquisition strategy was shown by root morphological traits in alpine fine root during freeze-thaw period. Shallow-root had similar response to freeze-thaw environmental conditions for these alpine plant species.