The organic carbonaccumulation rates indicate that the paleoproductivity increased in the northern SCS and decreased in the southern SCS during the past 900 years.
有机碳分析南海北部近900年来古生产力呈上升趋势，南部则为下降趋势。
2
The results showed that straw application increased crop yield, soil organic carbonaccumulation, soil total nitrogen and phosphorus content as well as phosphorus activation.
结果表明，秸秆还田提高了作物产量，增加了土壤有机碳积累和土壤氮磷含量，且能活化土壤磷素。
3
However, even when just considering the accumulation of biomass carbon, an agroforestry system is very efficient.