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首页> 外文期刊>Plant and Soil >Carbon and nitrogen cycling in a lead polluted grassland evaluated using stable isotopes (delta C-13 and delta N-15) and microbial, plant and soil parameters
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Carbon and nitrogen cycling in a lead polluted grassland evaluated using stable isotopes (delta C-13 and delta N-15) and microbial, plant and soil parameters

机译：使用稳定同位素（Delta C-13和Delta N-15）和微生物，植物和土壤参数评估铅污染草原中的碳和氮循环。

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摘要

Aims Carbon (C) and nitrogen (N) cycling are key ecosystem functions potentially altered by heavy metal pollution. We used an ecosystem approach to study the long-term effect of lead (Pb) on C and N cycles in a natural grassland in a former shooting range. Methods Microbial activity was evaluated by substrate-induced respiration (SIR) in situ, adding isotopically labelled C-4-sugar to the soil. C and N contents and natural abundance of isotopes were measured in grass leaves, soil and microbial biomass together with root biomass. Results A reduced microbial activity and microbial biomass per area, together with a higher soil C stock and C:N ratio suggested a lower microbial decomposition in high Pb compared to low Pb areas. A more closed N cycle in the high Pb area was indicated by 2-3 parts per thousand lower delta N-15 in leaves and soil compared to low Pb areas. Higher delta C-13 in leaves and higher root biomass but similar leaf nutrient contents indicated plant responses and adaptions to the high Pb. Conclusions The applied ecosystem approach revealed that Pb slowed down the C and N cycles, possibly by indirect effects rather than by direct toxicity. The ecosystem seems to have adapted to altered conditions.
机译：AIMS碳（C）和氮气（N）循环是主要的生态系统函数，其可能因重金属污染而改变。我们利用生态系统方法来研究前射击范围内天然草地C和N周期的铅（Pb）的长期效果。方法采用底物诱导的呼吸（SIR）评价微生物活性，以原位为土壤添加同位素标记的C-4-糖。在草叶，土壤和微生物生物量与根生物质一起测量同位素的C和N含量和天然丰度。结果与低PB区域相比，每面积减少每种微生物活性和微生物生物量减少，与较高的土壤C库存和C：N比在高PB中提出了较低的微生物分解。与低PB区域相比，高PB区域中，在高PB区域中的一个更闭合的N个循环在叶子和土壤中每千次下δn-15左右。叶片和较高的根生物质中较高的δC-13，但类似的叶营养物质表明植物反应和对高Pb的适应。结论应用的生态系统方法显示PB减缓C和N循环，可能是间接效应而不是通过直接毒性。生态系统似乎适应了改变的条件。

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