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Carbon sequestration in paddy ecosystems in subtropical China

机译:亚热带中国稻田生态系统中的碳封存

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Carbon (C) sequestration in paddy soils was studied in 4 selected landscape units as representatives for the lowland (LL), low-hill (LH), high-hill (HH) and karst-mountain (KM) areas in subtropical China. The mean values for organic C content in paddysoils (0-20cm) in the landscape unit varied from 16.0 to 27.7 g /kg, which were remarkably larger than those for soils under arable cropping and orchard, and even under woodland except in the KM landscape unit. In the LH landscape unit, the mean organicC content in paddy soils increased by 1.67 times (P<0.01) in the period of 1979-2003. This increase was concordant with the prolonged increase (since 1950s) in rice productivity in the region. It is concluded that paddy ecosystems in subtropical China had the ability to sequester organic C in amounts larger than those in other ecosystems. As these landscape units represent the real situations for paddy ecosystems under farmers' practices for rice production, data from this study confirm that the trendof continuing organic C sequestration in paddy soils occurred in subtropical China.
机译:在亚热带地区的低地(LL),低山(LH),高山(HH),高山(HH)和喀斯特山(KM)区域的4个选定的景观单位中研究了碳(C)碳(C)景观单元中Paddysils(0-20cm)中有机C含量的平均值,从16.0到27.7g / kg变化,这比杏仁种植和果园下的土壤较大,甚至在林地之下,除了km景观单元。在LH景观单元中,水稻土的平均含量含量在1979 - 2003年期间增加了1.67倍(P <0.01)。这种增加与该地区水稻生产率的长期增加(自20世纪50年代以来的延长态度很好。得出结论,亚热带中国的稻田生态系统能够以大于其他生态系统中的含量较大的能力。由于这些景观单位代表了农民在农民稻米生产方面的实际情况,本研究中的数据证实,亚热带地区发生了水稻土中继续有机C封存的趋势。

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