| 侵蚀红壤区马尾松人工林恢复过程中凋落物碳氮归还量变化 |
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| 引用本文： | 张世良,吕茂奎,邓翠,黄俊,黄桥明,熊小玲,姜永孟,谢锦升.侵蚀红壤区马尾松人工林恢复过程中凋落物碳氮归还量变化[J].亚热带资源与环境学报,2021,16(1):16-22. |
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| 作者姓名： | 张世良 吕茂奎 邓翠 黄俊 黄桥明 熊小玲 姜永孟 谢锦升 |
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| 作者单位： | 福建师范大学 湿润亚热带生态地理过程教育部重点实验室,福州350007;福建师范大学 地理科学学院,福州350007 |
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| 基金项目： | 国家自然科学基金面上项目(31870604);福建省科技厅对外合作项目(2019I0010)。 |
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| 摘 要： | 以福建省长汀县侵蚀红壤区恢复0、16和34年马尾松人工林为研究对象,采用“时空代换”法,研究侵蚀退化地植被恢复过程中马尾松和林下植被芒萁凋落物年输入量以及碳、氮归还量的变化。通过对不同恢复年限样地为期4年的凋落物观测,结果表明:植被恢复过程中凋落物输入量逐渐增加,不同恢复年限样地马尾松凋落物年输入量平均分别为0.60、2.34、3.33 t·hm-2·a-1,芒萁年输入量则分别为0.32、1.29、1.39 t·hm-2·a-1。植被恢复过程中马尾松凋落叶碳含量没有显著变化,其氮含量显著升高,C/N显著降低,而芒萁碳、氮含量和C/N相对稳定;此外,马尾松凋落物中碳的归还量显著高于芒萁,而芒萁凋落物中氮归还量高于马尾松,且马尾松凋落物C/N高于芒萁,说明芒萁在维持侵蚀退化地氮素供应的作用大于马尾松,且植被恢复能够提高马尾松氮的利用和归还,并且提高马尾松凋落物的质量。因此,增加具有高质量(低C/N)凋落物的林下植被芒萁覆盖,对提升侵蚀退化地土壤有机质水平具有重要的作用,今后在侵蚀退化地生态恢复工作中应着重关注高质量林下植被的恢复。
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| 关 键 词： | 马尾松 林下植被芒萁 凋落物量 碳和氮归还量 退化地 亚热带 |
Changes of Litter-derived Carbon and Nitrogen Return during Restoration of Pine Plantation in Eroded Red Soil Region |
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| ZHANG Shiliang,LüMaokui,DENG Cui,HUANG Jun,HUANG Qiaoming,XIONG Xiaoling,JIANG Yongmeng,XIE Jinsheng.Changes of Litter-derived Carbon and Nitrogen Return during Restoration of Pine Plantation in Eroded Red Soil Region[J].Journal of Subtropical Resources and Environment,2021,16(1):16-22. |
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| Authors: | ZHANG Shiliang LÜMaokui DENG Cui HUANG Jun HUANG Qiaoming XIONG Xiaoling JIANG Yongmeng XIE Jinsheng |
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| Institution: | (Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education,b. School of Geographical Sciences,Fujian Normal University, Fuzhou 350007,China) |
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| Abstract: | This study selected three Pinus massoniana plantation sites with different restoration years-unrestored site,restored for 16 years and for 34 years,which located at Changting County,Fujian Province.Dynamics changes in annual litterfall mass and litter-derived carbon(C)and nitrogen(N)return from the Masson pine and understory fern(Dicranopteris dichotoma)in the process of vegetation restoration in degraded land was studied by using space-time substitution method.Across the four-year of litterfall observation,the litterfall input increased gradually,the average annual input of litterfall from the Masson pine in different restoration years was 0.60,2.34 and 3.33t·hm-2·a-1,and from the understory fern was 0.32,1.29,and 1.39t·hm-2·a-1,respectively.During the restoration,the C content of the pine litter was constant while the N content increased significantly,and the C/N ratio decreased significantly.By contrast,there was no significant difference in the content of nitrogen and N,and C/N ratio of fern across the sites.In addition,the amount of C returned from the pine litter was significantly higher than that of the fern litter,which the amount of N returned from the fern litter was significantly higher than that of the pine litter,and the C/N of the litter of the Masson pine is higher than that of fern.The results indicated that the understory fern plays a greater role in maintaining the N supply of the eroded and degraded land than Masson pine.Vegetation restoration can increase the N utilization and return of the pine,and improve the quality of pine litter.Therefore,this research highlight the importance of increasing the understory vegetation cover with high-quality(low C/N)litter,which will play an important role in improving the soil organic matter level of eroded degraded land.Ecological restoration of eroded and degraded land should focus on high-quality understory vegetation. |
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| Keywords: | Pinus massoniana understory vegetation Dicranopteris dichotoma litterfall production carbon and nitrogen return degrade land subtropical region |
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