南京林业大学学报(自然科学版) ›› 2018, Vol. 42 ›› Issue (03): 153-158.doi: 10.3969/j.issn.1000-2006.201706016

• 研究论文 • 上一篇    下一篇

常见绿化树种对土壤碳氮垂直分布及有机碳储量的影响

袁在翔1,金雪梅1,翟凯燕1,陈 斌1,关庆伟1*,徐建峰2   

  1. 1. 南方现代林业协同创新中心,南京林业大学生物与环境学院,江苏 南京 210037; 2.太仓市林业站,江苏 太仓 215400
  • 出版日期:2018-06-06 发布日期:2018-06-06
  • 基金资助:
    基金项目:“十二五”国家科技支撑计划(2015BAD07B00); 江苏高校优势学科建设工程资助项目(PAPD) 第一作者:袁在翔(yzx0090@163.com)。*通信作者:关庆伟(guanjapan999@163.com),教授。

Effects of common urban tree species on vertical distribution of soil carbon & nitrogen and organic carbon storage

YUAN Zaixiang1, JIN Xuemei1, ZHAI Kaiyan1, CHEN Bin1, GUAN Qingwei1*, XU Jianfeng2   

  1. 1. Co-Innovation Center for the Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; 2.Taicang Forestry Station of Jiangsu Province, Taicang 215400, China
  • Online:2018-06-06 Published:2018-06-06

摘要: 【目的】调查常见绿化树种各立地土壤层次有机碳含量、全氮含量及有机碳储量等相关指标,分析树种差异对城市森林土壤碳氮垂直分布及有机碳储量的影响,为城市绿化树种的选择提供基础数据。【方法】以邻近农田相关指标为对照,测定分析了水杉、香樟、重阳木纯林下各土壤层次的有机碳含量、全氮含量及有机碳储量。【结果】①不同绿化树种纯林立地土壤有机碳、全氮含量存在一定差异,其变化范围分别为7.28~10.78、1.03~1.43 g/kg,均为重阳木林地土壤的含量最高; 各纯林土壤C/N的波动范围为4.78~9.56,水杉与重阳木之间差异显著。②各绿化树种纯林0~60 cm土壤有机碳储量变化范围在60.54~89.61 t/hm2之间,大小顺序为:重阳木>香樟>水杉。③试验地土壤有机碳含量与全氮含量之间存在显著或极显著的正相关关系。土壤有机碳、全氮含量主要与黏粒百分含量呈显著或极显著的正相关,与土壤密度呈显著或极显著的负相关。④造林后第7年森林土壤有机碳、全氮含量与有机碳储量均显著减少,各树种土壤C/N变化明显。其中,香樟、重阳木林地更接近于农田。【结论】在农田转为林地初期,土壤有机碳含量、全氮含量、有机碳储量均有不同程度减少,而落叶阔叶树种重阳木较其他绿化树种更有利于土壤有机碳恢复及固持。

Abstract: Abstract: 【Objective】 This study aimed to evaluate the effects of urban tree species on the vertical distribution of carbon and nitrogen and soil organic carbon storage, generating basic data for use in the selection of urban tree species in afforestation.【Method】 Soil organic carbon(SOC)and total nitrogen(TN)contents, as well as SOC storage at different soil depths were determined under urban monoculture stands of three tree species(i.e., Metasequoia glyptostroboides, Cinnamomum camphora and Bischofia polycarpa). These indices were compared with those of the nearby farmland.【Result】① SOC and TN contents under tree stands were species specific, they varied from 7.28 to 10.78 g/kg and from 1.03 to 1.43 g/kg, respectively, and were significantly higher under B. polycarpa stand than that under M. glyptostroboides and C. camphora stands. Throughout the three stands, soil C/N ratio varied from 4.78 to 9.56, and significantly differed between M. glyptostroboides and B. polycarpa. ② SOC storage was also species specific, ranging from 60.54 to 89.61 t/hm2 among the stands(B. polycarpa > C. camphora > M. glyptostroboides). ③ There was a significantly positive correlation between SOC and TN contents at all sites. In addition, SOC and TN contents were significantly positively correlated with clay content, but negatively correlated with soil bulk density. ④ SOC content, TN content and SOC storage were significantly lower under M. glyptostroboides, C. camphora and B. polycarpa stands compared to those in the farmland; the soil C/N ratio was significantly different between the tree stands and the farmland in the 7th year after afforestation. Compared to that under M. glyptostroboides stand, the soil C/N ratio value under C. camphora and B. polycarpa stands, was much closer to that under farmland.【Conclusion】 Overall, the SOC and TN contents, as well as SOC storage decreased at different rates during the early period of conversion of farmland to forest. This study showed that B. polycarpa, a broadleaf tree species, is more suitable for the early recovery and sequestration of SOC in response to land use change, compared with other urban species.

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