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Sequential coring method was used to collect the data of fine roots from June to August in alpine sandy land. Turnover rates were calculated by maximum or mean biomass during the growing season in 2015 using Decision Matrix (DM) or Maximum-Minimum (MM) method. Results show that biomass in June is lower than that in July and August. Turnover rates of Artemisia desertorum are higher than that of Caragana intermedia and Caragana korshinskii. Turnover rates of mixed forest are higher than that of pure forest. Soil gravimetric water content is highly related to root biomass/ length in the depth of 40 60 cm for Caragana intermedia and Caragana korshinskii. But soil gravimetric water content and root biomass/ length have no obvious regularity in the depth of 40 ~ 60 cm for Artemisia desertorum. The minimum water requirement threshold of around 0.02 can be acquired for Caragana intermedia and Caragana korshinskii in the arid region. In alpine sandy land, it is suitable to plant Artemisia desertorum compared to Caragana intermedia and Caragana korshinskii; mixed forest has more advantages compared to pure forest. Introduction Root is the main organ of a plant to exert the mechanical effects by holding the soil and reducing the soil water content. It helps to reinforce the soil, increase slope stability and decrease water erosion (Zhang et al. 2014). Further, fine roots play an important role in the cycling of water, nutrients, and carbon in terrestrial ecosystems (McCormack et al. 2015). Tree fine roots and their turnover rates have a fundamental role in determining the response of carbon input to the soil via fine roots litter (Leppälammi-Kujansuu et al. 2014). Trees can adjust the biomass of the fine roots or foraging strategy to meet the altered environmental conditions or vary the allocation between the above ground and below ground parts of the tree (Keyes et al. 1981, Mäkelä et al. 2008, Finér et al. 2011, Ostonen et al. 2011, Leppälammi-Kujansuu et al. 2014). Of these, fine roots turnover rates are one of the most common parameters included in terrestrial process models and often used to tune below ground carbon fluxes. In addition to its influence on carbon fluxes between soil pools and atmosphere, fine roots turnover rates also affect the total amount of roots standing biomass, thus potentially influencing nutrient and water uptake by plants (McCormack et al. 2015). However, due to lack of empirical data, many belowground processes are poorly represented in ecological models (Ostle et al. 2009, Iversen 2014, Smithwick et al. 2014, McCormack et al. 2015). Soils are the major terrestrial reservoir of organic carbon, and a large part of the carbon flux into the soil takes place via fine roots and mycorrhizal turnover (Vogt et al. 1986, Helmisaari et al. 2002, Lal 2005, Godbold et al. 2006). The response of carbon flux into the forest soil is particularly interesting in relation to climate change, but the environmental and biological factors *Author for correspondence: <fenglili_caf@163.com>.

Tree fine roots productivity and turnover rates estimation in alpine sandy land