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作 者:陈甜 元方慧 张琳梅 胡亚林[1] CHEN Tian;YUAN Fang-hui;ZHANG Lin-mei;HU Ya-lin(Forest Ecology&Stable Isotope Center,College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China)
机构地区:[1]福建农林大学林学院森林生态-稳定同位素研究中心,福州350002
出 处:《应用生态学报》2022年第10期2602-2610,共9页Chinese Journal of Applied Ecology
基 金:国家自然科学基金促进海峡两岸科技合作联合基金重点项目(U1805243);国家自然科学基金面上项目(42077094)资助。
摘 要:凋落物输入可显著影响土壤有机碳(SOC)矿化速率,但添加不同化学性质叶凋落物对土壤有机碳矿化释放CO_(2)及激发效应的影响及其机理仍不清楚。本研究将亚热带6种树种^(13)C标记的叶凋落物添加至天然次生林0~10 cm原位土柱中,比较不同树种叶凋落物添加对土壤总CO_(2)、外源凋落物和土壤来源CO_(2)释放速率和累积量以及激发效应的影响,并量化叶凋落物化学性质与土壤CO_(2)释放累积量、激发效应的相关关系。结果表明:添加叶凋落物能够显著提高土壤总CO_(2)和土壤来源CO_(2)释放量,存在显著正激发效应,激发效应值为68%~128%。不同树种叶凋落物添加对土壤有机碳矿化和激发效应的影响存在显著差异。Pearson相关分析和逐步多元线性回归分析发现,凋落物来源CO_(2)释放累积量与叶凋落物C、P和纤维素含量呈显著负相关,而土壤来源CO_(2)释放量与叶凋落物C∶N和木质素∶N呈显著正相关。综上,不同化学性质的叶凋落物对土壤有机碳矿化和激发效应的影响存在异质性,在亚热带地区森林类型转变过程中营造具有高质量叶凋落物的人工林将有助于减少森林土壤碳损失。Litter inputs can affect the mineralization of soil organic carbon(SOC).However,it is yet unknown how the input of leaf litter with different chemical properties drives SOC mineralization and priming effect.In this study,^(13)C-labeled leaf litter of six tree species were added to soil cores(10 cm depth)collected from a natural secondary forest in subtropical region.We examined the effects of different leaf litters on total soil CO_(2),litter-derived and soil-derived CO_(2) emission rates and accumulation and priming effect.We further examined the relationships between lit-ter chemical properties and CO_(2) accumulation and priming effect.Our results showed that leaf litter addition increased total soil CO_(2) and soil-derived CO_(2) emission rates and accumulations,and that there were positive priming effects ranging from 68%to 128%.Soil organic carbon mineralization and priming effects varied among tree species.The Pearson correlation and stepwise multiple linear regression analysis showed that the litter-derived CO_(2) accumulation had negative correlation with leaf litter C,P and cellulose concentrations,whereas the soil-derived CO_(2) accu-mulation were positively correlated to litter C:N and lignin:N.The results implied that tree species could influence SOC mineralization and litter-induced priming effect.Thus it could mitigate soil C loss when we afforested plantation with high quality leaf litter in subtropical region.
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