کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4425343 | 1309100 | 2010 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Elevated carbon dioxide does not offset loss of soil carbon from a corn–soybean agroecosystem Elevated carbon dioxide does not offset loss of soil carbon from a corn–soybean agroecosystem](/preview/png/4425343.png)
The potential for storing additional C in U.S. Corn Belt soils – to offset rising atmospheric [CO2] – is large. Long-term cultivation has depleted substantial soil organic matter (SOM) stocks that once existed in the region's native ecosystems. In central Illinois, free-air CO2 enrichment technology was used to investigate the effects of elevated [CO2] on SOM pools in a conservation tilled corn–soybean rotation. After 5 and 6 y of CO2 enrichment, we investigated the distribution of C and N among soil fractions with varying ability to protect SOM from rapid decomposition. None of the isolated C or N pools, or bulk-soil C or N, was affected by CO2 treatment. However, the site has lost soil C and N, largely from unprotected pools, regardless of CO2 treatment since the experiment began. These findings suggest management practices have affected soil C and N stocks and dynamics more than the increased inputs from CO2-stimulated photosynthesis.
Journal: Environmental Pollution - Volume 158, Issue 4, April 2010, Pages 1088–1094