Disertation Research: Leaching of Dissolved Carbon and Nitrogen

9701765 Robertson虽然有机碳和氮通过可溶形式的损失对源和汇生态系统都有影响，但通量的范围和幅度知之甚少。密歇根州西南部农业景观中一系列生态系统的初步数据表明，溶解有机氮的通量可能相当显着。对主要在森林中研究的可溶性有机碳和氮的沥滤文献的回顾表明，只有非生物控制。这里提出了几种生物控制，因为它们对非生物控制的巨大影响显着影响溶解有机碳和氮（DOM）的浸出。为了更好地理解控件，了解被过滤的DOM的源代码是至关重要的。这项研究提出了一个两层的方法来看待这两个方面。对不同生态系统沿着演替梯度的广泛研究和对一个生态系统中淋溶DOM来源的同位素示踪剂的深入研究。据推测，那些影响水力通量的因素将有最大的影响质量损失的C和N通过淋溶有机形式。

9701765 Robertson While the loss of organic carbon and nitrogen via soluble forms has implications both for source and sink ecosystems, the extent and magnitude of fluxes are poorly known. Preliminary data from a range of ecosystems in an agricultural landscape in southwest Michigan suggest that fluxes of dissolved organic nitrogen can be quite significant. A review of the literature on leaching of soluble organic carbon and nitrogen, primarily studied in forests, suggests only abiotic controls. Several biotic controls are proposed here, given their large effect on the abiotic controls shown to significantly affect leaching of dissolved organic carbon and nitrogen(DOM). To better understand controls, an idea of the source of the leached DOM is critical. This study proposes a two tiered approach to looking at both aspects. A broad study of different ecosystems along a successional gradient and an intense study using isotopic tracers on the sources of leached DOM in one ecosystem. It is hypothesized that those factors which influence hydraulic flux will have the greatest effect on the mass loss of C and N through leached organic forms.