کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8365180 1542616 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nutrient availability limits carbon sequestration in arable soils
ترجمه فارسی عنوان
در دسترس بودن مواد غذایی محدودیت کربن را در خاک های زراعی محدود می کند
کلمات کلیدی
در دسترس بودن مواد مغذی، تداخل کربن، بازده خنثی سازی، اثر پایه، ماده آلی خاک کوچک، استراتژیست ها،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
چکیده انگلیسی
Soils are the largest reservoir of global terrestrial carbon (C). Conversion from natural to agricultural ecosystems has generally resulted in a significant loss of soil organic-C (SOC, up to 50% or ∼30-40 t ha−1) and 'restoring' this lost C is a significant global challenge. The most stable component of soil organic matter (SOM), hereafter referred to as fine fraction SOM (FF-SOM), contains not only C, hydrogen (H) and oxygen (O), but substantial amounts of nitrogen (N), phosphorus (P) and sulphur (S), in approximately constant ratios. The availability of these associated nutrients is essential for the formation of FF-SOM. Here we show, in short term (56 day) incubation experiments with 13C labelled wheaten straw added to four soils with differing clay content, that conversion of straw into “new” FF-SOM is increased by up to three-fold by augmenting the residues with supplementary nutrients. We also show that the loss of “old” pre-existing FF-SOM increased with straw addition, compared to soils with no straw addition, but that this loss was ameliorated by nutrient addition in two of our soils. This finding may illuminate why the build-up of SOC in some productive agricultural soils is often much less than expected from the amounts of C-rich residues returned to them because optimum C sequestration requires additional nutrients above that required for crop production alone. Moreover, it provides greater understanding of short-term dynamics of C turnover in soil, and in the longer term, may have important implications for global strategies aimed at increasing soil C sequestration to restore fertility and help mitigate climate change.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 68, January 2014, Pages 402-409
نویسندگان
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