Distributions of n-alkanes and their hydrogen isotopic composition in plants from Lake Qinghai (China) and the surrounding area

► We investigate n-alkanes and their hydrogen isotopes in plants from an arid region. ► Average chain length values of n-alkane are closely related to plant species. ► Evaporation of lake water influences δD values of n-alkanes in aquatic plants. ► Humidity and rainfall affect δD values of n-alkanes in terrestrial plants. ► δD values of n-alkane in aquatic and terrestrial plants record source water δD values.