کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
306003 513065 2012 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Changes in soil carbon sequestration, fractionation and soil fertility in response to sugarcane residue retention are site-specific
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
Changes in soil carbon sequestration, fractionation and soil fertility in response to sugarcane residue retention are site-specific
چکیده انگلیسی

Sugarcane crop residues contain substantial quantities of C and plant nutrients, but there have been relatively few studies of how sugarcane residues enrich the soil and contribute to C sequestration, and most studies have been undertaken at only one or a few sites. The purpose of this study was to address these knowledge gaps by determining the magnitude and time scale of changes in soil concentrations of total C, C fractions and plant nutrients following retention of sugarcane residues. C fractions were determined by two different methods. We sampled soils from five experiments, in contrasting environments, where sugarcane residues had been either retained or removed for between 1 and 17 years. Changes in the concentration of both soil C and plant nutrients were highly site-specific and not in proportion to the period that residues were retained: for example, soil C (0–250 mm) decreased by 0.9 g kg−1 and 0.5 g kg−1 at sites where residues had been retained for 1 and 17 years, respectively, but increased by 2.0 g kg−1 at a site with residues retained for 6 years. Soil C composition, defined by the KMnO4 oxidation and particulate organic C-ultraviolet photo-oxidation fractionation (POC-UV) schemes, appeared to be a more sensitive indicator of changes in residue management, indicating that increases in readily-oxidisable C and particulate organic C, respectively, after 1 year of retaining instead of burning residues. The two methods provided different information that was complementary in understanding changes in soil C. The KMnO4 method identified downward movement of C fractions in the profile to 250 mm, while the labile fractions measured by the POC-UV scheme appeared to be more sensitive to early changes in residue management (after 1 year). While recent studies have found that several concentrations of KMnO4 reduced all C fractions by a similar magnitude and thus concentrated on the fraction oxidised by the 333 mM concentration of KMnO4, we found that use of both this and the 33 mM concentration enabled a greater understanding of changes in C pools due to residue management.


► Sugarcane residue retention has highly site-specific affects on soil C sequestration and soil fertility.
► Effects were not related to the time (1–17 years) of residue retention, or the environment in which sites were located.
► Composition of soil C was a more responsive to residue management than amount of soil C.
► As well, different methods of soil C fractionation gave different information about soil C.
► We conclude that modelling will be useful to understand residue management impacts on C sequestration in sugarcane crops.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil and Tillage Research - Volume 120, April 2012, Pages 99–111
نویسندگان
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