Allochthonous organic matter

The maximum value of HON/AON increases in systems with allochthonous carbon inputs. The maximum potential is related directly to the allochthonous organic matter input that is respired in the system (Alloch. Resp.). Additionally, the increased HON will depend on the relative growth efficiency of heterotrophic bacteria on allochthonous material (BGEa och) and the C N ratio of allochthonous material (C Nalloc]l), such that... 

The proposed pattern based on inputs and respiration of allochthonous organic matter cannot be confirmed based on data that presently exist. First, relatively few systems have been studied and many studies do not cover the... 

The contribution of allochthonous organic matter to lake sediment humic substances is variable. In this chapter, we did not discuss in depth the contribution of allochthonous materials, such as soil organic matter, to sedimentary humic substances. However, it is important in the study of lake humic substances to determine how much authochthonous or allochthonous organic matter contributes to the formation of lake humic substances. Therefore, a method must be established for estimating the degree of contribution of authochthonous or allochthonous organic matter to lake humic substances. 

Dystrophic. Subject to a high loading of allochthonous organic matter, but with a low level of autochthonous input. Dystrophic lakes are heavily stained ( brown water ) and have a high content of humic substances. 

A.V. Vahatalo, K. Salonen, U. Munster, M. Jarvinen, R.G. Wetzel (2002). Photochemical transformation of allochthonous organic matter provides bioavailable nutrients in a humic lake. Arch. Hydrobiol, in press. 

Humic-like fluorescence is predominately but not solely associated with allochthonous organic matter derived from degrading soil and plant matter. Relative to microbial derived material enriched in amino acid-like FDOM, humic-like FDOM is not expected to be preferentially degraded by bacteria, and thus considered to be a proxy for slowly... 

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