Land Plants in Phanerozoic Biogeochemical Cycles: The Evolving Global Balance

陆地植物的遗传进化和地理生态变化（植物地理学）在显生宙植物大量参与的生物地球化学循环，特别是碳、氧、氮、磷和可溶性碱的循环中占有重要地位。这种关系是双向的，大气和基质既塑造又被植物的进化和分布所塑造。寻求支持：(A)整合来自众多学科的资料，以便更完整和更定量地描述陆地植物在显生宙期间与地球物理和化学系统相互作用的机制；(B)开始研究一种结构，以跟踪陆地生物群演变的空间分布，并推断植物地理分布的地球化学影响；(C)对大气成分，特别是O2水平对植物组织燃烧和分解的影响进行简单的实验。提出的研究将阐明显生宙中难成岩的形成、分解和埋藏趋势；改善大气中O2水平对火灾的影响，从而对陆地生物群的组织和地球化学平衡的影响；改善陆地生物群在一维地球化学模型中的表现；并为将植被覆盖纳入三维地球化学-气候模型奠定了基础。

The genetic evolution and changing geographical ecology of land plants (phytogeography) has been important in the Phanerozoic history of the biogeochemical cycles in which plants massively participate, especially the cycles of carbon, oxygen, nitrogen, phosphorus, and soluble bases. The relationship is bi- directional, with the atmosphere and substrate both shaping, and being shaped by, the evolution and distribution of plants. Support is sought to: (A) Integrate information from numerous disciplines toward more complete and more quantitative descriptions of the mechanisms by which land plants have interacted with the physical and chemical Earth system over Phanerozoic time; (B) Initiate work on a structure to track the spatial distributions of the evolution of the land biota and to deduce the geochemical ramifications of phytogeographic distributions; and (C) Undertake simple experiments on the effects of atmospheric composition, especially O2 level, on the combustion and decomposition of plant tissues. The proposed research will elucidate Phanerozoic trends in the creation, decomposition, and burial of refractory Corg; improve specifications of the effect of atmospheric O2 level on fire, and thereby, on the organization of the land biota and on geochemical balances; improve the representation of the land biota in one dimensional geochemical models; and lay a foundation for incorporation of vegetative cover into a three dimensional linked geochemical-climate model.