Soils of the Atacama Desert: reservoir and fingerprint of life (B05+)

我们在第一阶段的工作证明，在阿塔卡马沙漠中，过去生命的指纹被保留了下来，有机物或微生物δ18OP转化的热点证明了这一点，这些转化大多发生在地下。在第二阶段，我们假设；（一）在小尺度上，生命痕迹受微地形、地下蓄水和地下不连续性（如石膏沙漠中形成的裂缝和多边形）的控制，而（二）在大尺度上，生命痕迹也受雾和粉尘沉积程度的影响。总的来说，这使我们能够考虑是什么触发和驱动了景观层面以及整个阿塔卡马沙漠的生命进化和分散。

Our work in phase I has proved that in the Atacama Desert fingerprints of past life are preserved, as evidenced by hotspots of organic matter or microbial δ18OP transformation, which occur in most cases buried in subsurface. In the second phase, we hypothesize now that on; (i) the small-scale, traces of life are controlled by micro-relief, subsoil water storage and subsoil discontinuities (e.g. cracks and polygons formed in the gypsum desert), whereas (ii) on the large scale, traces of life are also influenced by fog and the degree of dust deposition. Altogether this enables us to consider what triggered and drives the evolution and dispersal of life on the landscape level as well as across the whole Atacama Desert.