ИСТИНА

Assuming the root zone is located immediately above the capillary fringe, resulting in a rooting depth of 5.05 m. We then divided the total rooting depth into 101 layers, with a layer thickness of 5 cm per layer. A “watered” root layer was introduced to represent a “virtual” soil layer with overall root density within the air entry zone and the underlying saturated zone. We set up a “watered” root layer with 40% of the total roots in the bottom layer (i.e., the 101-th layer), which was fixed during the simulation [Xu et al., 2011]. The remaining 60% was then uniformly distributed within the upper 100 layers at the beginning and allowed to evolve via VOM during the simulation. Conclusions VOM: Plant optimality through adjusting root system is a way for plant to adapt to harsh environments. We have implemented VOM into Noah-MP and tested this approach at a riparian Tamarix spp. stand under a hyper-arid climate. Compared with the original prescribed root, the modeling results were significantly improved using the dynamic root model, particularly during the dry seasons. Future work will focus on carbon assimilation & developing a scheme for optimizing carbon allocation to root.