Biotic and abiotic controls over ecosystem cycling of stable natural nitrogen, carbon and sulphur isotopes
Biotic and abiotic controls over ecosystem cycling of stable natural nitrogen, carbon and sulphur isotopes
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稳定天然氮、碳和硫同位素生态系统循环的生物和非生物控制
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
E. Schulze
中科院分区：
文献类型：
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作者：
G. Bauer;G. Gebauer;A. F. Harrison;P. Högberg;L. Hogbom;H. Schinkel;Andy F. S. Taylor;M. Novák;F. Buzek;D. Harkness;T. Persson;E. Schulze
在森林生态系统中，调节物质的吸收和流动的物理、化学和生物过程由于分馏而导致N、C和S化合物的同位素特征的差异。因此，追踪森林生态系统中同位素分馏过程有助于确定转移途径和能力。大气氮污染已被认为是以前氮有限的森林接近氮饱和的原因（Aber等人，1989年，1998年）。森林生态系统中氮素有效性的增加可能对局部尺度上的净生态系统生产力产生影响，但也可能对全球尺度上陆地生态系统的碳收支产生影响（Schulze 1994; Schimel 1995）。显然，了解森林生态系统中氮的沉积和循环量对于陆地生物圈的碳同化至关重要（Lloyd和Farquhar，1996年）。同样，关于稳定硫同位素的信息对于污染输入及其对生态系统健康的影响也很重要（Krouse，1989年; Gebauer等人，1994年）。
In forest ecosystems, physical, chemical and biological processes which regulate the uptake and flow of matter cause differences in the isotopic signatures of N, C and S compounds due to fractionation. Thus, tracing processes of isotopic fractionations in forest ecosystems can help identify transfer pathways and capacities. Atmospheric nitrogen pollution has been recognised as the cause for formerly N-limited forests to approach N saturation (Aber et al. 1989, 1998). The increase in N availability in forest ecosystems may have consequences for net ecosystem productivity on a local scale, but also for the carbon budget of terrestrial ecosystems on a global scale (Schulze 1994; Schimel 1995). Clearly, knowledge about the amount of N being deposited and cycling through forest ecosystems is of paramount importance for the carbon assimilation of the terrestrial biosphere (Lloyd and Farquhar 1996). In a similar manner, information on stable sulphur isotopes is of importance regarding pollution inputs and their effect on ecosystem health (Krouse 1989; Gebauer et al. 1994).