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依托江西水土保持生态科技园,研究了侵蚀型红壤退化裸地恢复为百喜草地、柑橘果园和湿地松林后,0~100 cm深度范围内不同土层(0~10、>10~20、>20~40、>40~70和>70~100 cm)中w(TOC)(TOC为总有机碳)以及表层(0~40 cm)土壤中活性有机碳组分含量的变化.结果表明:1退化裸地土壤中w(TOC)和有机碳库储量分别仅为4.73 gkg和48.41 thm2,均处于较低水平,w(TOC)的垂直分布特征也不明显;恢复为百喜草地和柑橘园后,w(TOC)分别增至7.08和7.69 gkg,有机碳库储量分别增至55.09和70.78 thm2,并且植被恢复对表层土壤中w(TOC)影响显著,而对深层(>40 cm)土壤影响有限.2以退化裸地为对照,百喜草地和柑橘果园土壤碳吸存量分别为6.68和22.36 thm2,平均碳吸存速率分别为0.51和1.72 t(hm2·a);以保存较好的湿地松林为参照,退化裸地、百喜草地和柑橘果园土壤碳吸存潜力分别为23.71、17.03和1.34 thm2,说明严重侵蚀地的碳吸存潜力巨大.3侵蚀型红壤退化裸地的植被恢复可积极促进表层土壤中DOC(水溶性有机碳)、MBC(微生物生物量碳)和POC(颗粒有机碳)的积累,同时该影响存在表聚效应,即植被恢复后土壤表层中活性有机碳组分含量在w(TOC)中所占比例增大.
Relying on the Jiangxi Provincial Soil and Water Conservation Ecological Science and Technology Park, the effects of restoration of degraded eroded red soils on grassland, citrus orchards and Pinus elliottii in different soil layers (0 ~ 10,> 10 ~ 20,> 0 ~ (TOC) (TOC = total organic carbon) and soil organic carbon (0-40 cm) from 20 to 40, from> 40 to 70 and from> 70 to 100 cm.The results showed that The contents of soil organic carbon (TOC) and organic carbon storage in degraded bare soil were only 4.73 gkg and 48.41 thm2, respectively, all at a low level. The vertical distribution of w (TOC) was also not obvious. (TOC) increased to 7.08 and 7.69 gkg, respectively, and organic carbon stocks increased to 55.09 and 70.78 thm2, respectively. Vegetation restoration had a significant effect on T (subscript T) in topsoil, while in deep layer (> 40 cm) .2 The soil carbon stocks of the hippophae rhamnoides and citrus orchards were 6.68 and 22.36 thm2, respectively, and the average carbon sequestration rates were 0.51 and 1.72 t (hm2 · A). The soil carbon storage potential of degraded bare land, hippophae or citrus orchard was 23.71, 17.03 and 1.34 thm2, respectively The potential for carbon uptake in the eroded area is significant.3 Vegetation restoration in the degraded bare land of erosive red soils can actively promote the accumulation of DOC (water soluble organic carbon), MBC (microbial biomass carbon) and POC (particulate organic carbon) in surface soils, At the same time, this effect has the effect of surface aggregation, that is, the content of active organic carbon in the soil surface after the vegetation restoration increases in the proportion of w (TOC).