کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4428693 1619797 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Soil carbon dynamics: The effects of nitrogen input, intake demand and off-take by animals
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Soil carbon dynamics: The effects of nitrogen input, intake demand and off-take by animals
چکیده انگلیسی

Elucidation of the drivers of soil carbon (C) change is required to enable decisions to be made on how to achieve soil C sequestration. Interactions between different components in the ecosystem in combination with feedback mechanisms mean that identifying drivers through conventional experimental approaches or by retro-fitting models to data are unlikely to result in the insights needed for the future.This paper explains soil C dynamics by using a process-based model. Drivers considered in the model include nitrogen (N) fertiliser inputs, intake demand, and off-take of animal products. The effect of the grazing animal in uncoupling the C and N cycles is explained, plus the implications of the farming system (‘drystock’ versus milk). The model enables depiction of the dynamic equilibrium achieved with time when a proposed change in the drivers is sustained. The results show that soil C loss under lactating cows is a result of N, rather than C, being removed in milk. Counter-intuitively, at the same intake demand, N loss under ‘milk’ is less than under ‘dry-stock’, as is C loss in animal respiration. Possibilities for changing the longevity of C in the soil are discussed, and the compromise between food production, N loss and C sequestration is considered.


► We identify key drivers of soil C change in temperate managed grassland.
► Stocking rate has a major effect in reducing soil C sequestration potential.
► Soil C loss under lactating cows is a result of N, not C, being removed in milk.
► At the same intake demand, N loss under milk is less than under dry-stock.
► Food production, N loss and C sequestration cannot be maximised at the same time.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 465, 1 November 2013, Pages 205–215
نویسندگان
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