کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2024832 1542625 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bacterial growth and growth-limiting nutrients following chronic nitrogen additions to a hardwood forest soil
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
پیش نمایش صفحه اول مقاله
Bacterial growth and growth-limiting nutrients following chronic nitrogen additions to a hardwood forest soil
چکیده انگلیسی

Increasing nitrogen (N) deposition due to anthropogenic activities has become a significant global change threat to N-poor terrestrial ecosystems. We compared bacterial growth and nutrients limiting bacterial growth in one of the longest running experiments on increasing N-deposition to a temperate forest, the Chronic Nitrogen Amendment Study at Harvard Forest, USA. Soil samples were collected in fall 2009 from the organic and mineral horizons of plots treated annually since 1988 with 0 (unfertilized), 50 (low N) or 150 (high N) kg N ha−1 as NH4NO3. In the organic horizon, bacterial growth (leucine incorporation) decreased by 5 times in the high N plots compared to the unfertilized treatment, while no decrease was observed in the mineral horizon. Bacterial growth in all soils was primarily limited by lack of carbon (C), although adding only C (as glucose) resulted in only a minor increase in bacterial growth in the unfertilized soil compared to adding C in combination with N. The bacterial growth induced by adding only C increased with higher level of N fertilization, up to 7–8 times the level without any C addition in the high N treatment, suggesting increased availability of N for the bacteria with increasing N addition.


► The effect of increasing N-deposition to a temperate forest soil was studied.
► Increasing N resulted in decreased bacterial growth.
► Bacterial growth was limited by lack of C irrespective of the soil N status.
► The response of bacterial growth after adding C reflected the N status of the soils.
►  Bacterial growth after adding C may be used as a proxy of N availability in soil.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 59, April 2013, Pages 32–37
نویسندگان
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