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以植被空间排列顺序推断时间演替顺序,采用同步辐射软X射线探讨子午岭林区典型植物样地白羊草(Bothriochlor ischaemum)狼牙刺(Sophora viciifolia)辽东栋群落(Quercus liaotungensis)演替过程中土壤有机碳官能团变化。图谱定性分析显示,恢复过程中各植被条件下0—5 cm和20—40 cm土层土壤脂肪-C、酮-C吸收强度明显增加;0—5 cm土层土壤脂肪-C吸收较20—40 cm强,而土壤酮-C吸收较20—40 cm弱。半定量分析结果显示,随植被演替进程,0—5 cm土层土壤各官能团相对百分含量都有所增加,如芳香-C、脂肪-C、酮-C呈现逐渐增加趋势,至辽东栎群落时,20—40 cm土层土壤脂肪-C相对百分含量明显增加。植被恢复过程中,各样地SOC官能团组成基本一致,但植被恢复影响土壤SOC官能团数量变化;植被恢复能促进0—5cm和20—40 cm土层土壤脂肪-C、酮-C含量增加,并且这种作用随着植被恢复时间的延长逐渐增强,说明植被演替增强了土壤有机碳化学稳定性。
The order of temporal succession was deduced from the sequence of vegetation spatial order, and the synchrotron radiation Soft X-ray was used to explore the succession process of both species of Sophora viciifolia and Quercus liaotungensis in the typical plant community of Bothriochlor ischaemum Soil organic carbon functional group changes. The qualitative analysis of the map showed that the soil C-C absorption intensities of 0-5 cm and 20-40 cm layers were significantly increased under the different vegetation conditions during the restoration process. The soil fat-C absorption of 0-5 cm layer was higher than that of 20- 40 cm, while soil ketone-C absorption is weaker than 20-40 cm. Semi-quantitative analysis showed that the relative percentage of functional groups in 0-5 cm soil layer increased along with vegetation succession process, such as Aromatic-C, Fat-C and Kone-C showed a gradual increase trend to Quercus liaotungensis In the community, the relative percentage of soil fat-C in 20-40 cm soil layer increased obviously. During vegetation restoration, the composition of SOC functional groups in different plots was basically the same, but the vegetation restoration affected the changes of soil SOC functional groups. Vegetation restoration could promote the increase of soil C-C and K-C contents in 0-5cm and 20-40cm soil layers This effect increased with the extension of vegetation restoration time, indicating that the vegetation succession enhanced the chemical stability of soil organic carbon.