■干旱荒漠地区的降水格局发生了明显变化,然而,目前尚不清楚TamarixramosissimaLedeb的用水策略。在coppice沙丘上,自然降水梯度受到影响。
■在这项研究中,木质部水的氢和氧同位素组成,土壤水,降水,霍城的地下水通过稳定同位素技术进行了测量,摩索湾,还有塔中。此外,结合MixSIAR模型研究了自然降水梯度的用水策略。
■结果表明,从半干旱到高干旱区,拉莫西马的水源表现出明显的变化。在半干旱地区,T.ramosissima主要吸收浅,浅中,和中间土壤水;然而,T.ramosissima将其主要水源转移到干旱地区的中深层土壤水。在极度干旱的地区,它主要利用深层土壤水和地下水。相比之下,在干旱区,毛虫的水源贡献率在各层中表现出相对均匀性。值得注意的是,在超干旱地区,T.ramosissima的地下水比例很高,达到60.2%。这是由于相对较浅的地下水补充了该地区深层的土壤含水量。总之,从半干旱到高干旱区,拉莫西马的浅层土壤水分比例下降了14.7%,说明了T.ramosissima利用的潜在水源从浅层到深层土壤水和地下水的逐渐转移。
■因此,T.ramosissima在小沙丘上显示了与降水和地下水有关的灵活的用水策略,反映了其强烈的环境适应性。研究结果对干旱地区水资源保护和植被恢复具有重要意义。
UNASSIGNED: The precipitation pattern has changed significantly in arid desert areas, yet it is not clear how the water use strategies of Tamarix ramosissima Ledeb. on coppice dunes along a natural precipitation gradient are affected.
UNASSIGNED: In this study, the hydrogen and oxygen isotope compositions of xylem water, soil water, precipitation, and groundwater were measured by stable isotope techniques in Huocheng, Mosuowan, and Tazhong. Additionally, the water use strategies of natural precipitation gradient were investigated in conjunction with the MixSIAR model.
UNASSIGNED: The results indicated that the water sources of T. ramosissima exhibited significant variation from semi-arid to hyper-arid areas. In semi-arid areas, T. ramosissima mainly absorbed shallow, shallow-middle, and middle soil water; however, T. ramosissima shifted its primary water sources to middle and deep soil water in arid areas. In hyper-arid areas, it mainly utilized deep soil water and groundwater. In contrast, the water source contribution rate of T. ramosissima exhibited relative uniformity across each layer in an arid area. Notably, in hyper-arid areas, the proportion of groundwater by T. ramosissima was significantly high, reaching 60.2%. This is due to the relatively shallow groundwater supplementing the deep soil water content in the area. In conclusion, the proportion of shallow soil water decreased by 14.7% for T. ramosissima from semi-arid to hyper-arid areas, illustrating the occurrence of a gradual shift in potential water sources utilized by T. ramosissima from shallow to deep soil water and groundwater.
UNASSIGNED: Therefore, T. ramosissima on coppice dunes shows flexible water use strategies in relation to precipitation and groundwater, reflecting its strong environmental adaptability. The findings hold significant implications for the conservation of water resources and vegetation restoration in arid areas.