Belowground which consist of fine a

Belowground which consist of fine and coarse root have been known contribute to soil organic pools and accumulation while they are alive, as well as after senescence while they are decomposing (Smith 1976). In addition, root decomposition influences aggregate formation and formation of particulate organic C (Puget and Drinkwater 2001). Majority of belowground biomass is located in corse roots. These coarse roots primarily act as connduits for nutrients and water, a storage site of carbon and nutrients and provide physical achorage for trees. In addition, the turnover of coarse roots provides a slow delivery of C and nutrients to the soil and soil biota and influences the longterm ecosystem productivity and CO2 emission from forest (Misra et al. 1998). In contrast, fine root which has been known component of belowground account only for few percent of total tree of biomass. They can consume up aproximately 30-50% of annual net primary production. In addition, fine root biomass and turnover may even be more important for the accumulation of carbon in forest soils than above-ground litter input (Block et al. 2006; Hertel et al. 2009).
The root system has a great influence how forest respond to antrhropogenic disturbances (Powers 2004). Thus, understanding controls of root turnover is important to predict how carbon and nutrient cycling, plant growth and plant productivity vary under environmental change (Eissenstat and Yanai 1997). Root morphology has the main fuction in balancing costs and benefits in growth and root activity (Espeleta and Donovan 2002) and therefore can have a strong impact on fine root turnover and, as a result, will affect soil carbon dynamics (Comas et al. 2002; Hertel et al. 2009).