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- W2393680764 abstract "Soil C stock is believed as an important and dynamic C stock of the Earth terrestrial ecosystem,of which a small loss even at 0.1% would impose great change in atmospheric CO2 concentration. Particulate organic carbon (POC) of soil may be indicative of important information for land use changes as it has shorter residence time than total organic carbon (TOC). The authors sampled topsoils from a long-term experiment field of a purple paddy soil from Chongqing,China and analyzed the contents and depth distri-bution of TOC and POC respectively. The paddy had been treated continuously with different tillage and cropping systems since 1991 containing 28 cropping seasons within the total 14 years. The results obtained are as follows. A maximum topsoil (0～10 cm) content of both TOC and POC was found under ridge tillage with rice (Oryza sativa) and rape (Brassica) rotation,and a minimum of them under leveling tillage and rice and wheat rotation. The TOC contents of the total plow layer of 0-30cm ranged from 8.92 g·kg-1 to 29.98 g·kg-1 and that of POC from 0.54 ～3.43 g·kg-1,decreasing with the soil depth under all the treatments. An exponential re-gression of POC content with TOC was observed. It is suggested that both TOC and POC content could be considered as an indicator for evaluating the land use change on soil quality,but POC to be more sensitive. And the SOC enhancement under ridge tillage and rice and rape rotation may be associated with the enhanced physical protection of sequestered C in course aggregates,which was promoted under minimum tillage with ridge and rice and rape rotation." @default.
- W2393680764 created "2016-06-24" @default.
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- W2393680764 date "2007-01-01" @default.
- W2393680764 modified "2023-09-23" @default.
- W2393680764 title "Variation of total and particulate organic carbon in topsoil of a Purple paddy under different land use practices" @default.
- W2393680764 hasPublicationYear "2007" @default.
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