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研究三峡库区典型流域退耕地植物种类和凋落物对土壤有机碳(SOC)固定和迁移的影响。2008年设计C3植物处理(A1)、C4植物香附子无凋落物处理(B0)和双倍凋落物处理(B2)裂区试验,2010年分层采集土壤和植物样品,测定SOC碳密度和稳定性碳同位素δ13C值的变化。结果表明:三峡库区典型流域退耕地土壤SOC密度由于土地利用的变化均发生了变化,退耕2年后,A1区内0～30cm层内SOC量持续增加,平均增加了58.4g·m-2(1.1%);C4处理的无凋落物区B0,SOC密度增加最为显著,为303g·m-2(4.9%),但双倍凋落物区B2,SOC密度降低了79g·m-2(1.1%)。凋落物对SOC密度影响显著(P<0.05)。
This paper studied the effects of plant species and litterfall on soil organic carbon (SOC) fixation and migration in the typical watershed of the Three Gorges Reservoir area. In 2008, C3 plant treatment (A1), C4 plant fragrant monkfish seedless litter treatment (B0) and double litter treatment (B2) split zone test were designed. Soil and plant samples were stratified and collected in 2010 to determine SOC carbon density and stability Changes of sex carbon isotope δ13C values. The results showed that the SOC density of degraded cultivated lands in the typical watershed of the Three Gorges Reservoir Area changed due to the change of land use. After 2 years of conversion, the SOC in the 0 ~ 30 cm layer of A1 area continued to increase, with an average increase of 58.4g · m-2 (1.1%). The density of SOC in B0 and C4 without litter was the highest, which was 303g · m-2 (4.9%). However, the density of SOC in B2 and SOC decreased by 79g · m-2 %). Litter had a significant effect on SOC density (P <0.05).