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[1]李建平,陈婧,谢应忠,等.封育对草地深层土壤碳储量及其固持速率的影响[J].水土保持研究,2016,23(06):1-8.
　LI Jianping,CHEN Jing,XIE Yingzhong,et al.Dynamics of Carbon Storage and Its Sequestration Rate in Deeper Soil Layers Following Long-term Fenced Grasslands[J].Research of Soil and Water Conservation,2016,23(06):1-8.

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封育对草地深层土壤碳储量及其固持速率的影响

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 23 期数: 2016年06期页码: 1-8 栏目: 出版日期: 2016-12-28

Title:: Dynamics of Carbon Storage and Its Sequestration Rate in Deeper Soil Layers Following Long-term Fenced Grasslands

作者:: 李建平¹, 陈婧¹, 谢应忠^1,2, 葸杰³; 1. 宁夏大学农学院, 银川 750021;
2. 西北退化生态系统恢复与重建国家重点实验室培育基地, 银川 750021;
3. 固原市原州区草原工作站, 宁夏固原 756000

Author(s):: LI Jianping¹, CHEN Jing¹, XIE Yingzhong^1,2, XI Jie³; 1. School of Agriculture, Ningxia University, Yinchuan, 750021, China;
2. Breeding Base of State Key Laboratory for Preventing Land Degradation and Ecological Restoration, Ningxia University, Yinchuan 750021, China;
3. Workstation of Grassland in Guyuan, Guyuan 756000, China

关键词:: 有机碳储量; 有机碳固持; 碳固持速率; 碳氮比; 封育草地

Keywords:: SOC storage; SOC sequestration; rate of C sequestration; C/N ratio; fenced grassland

分类号:: S153.6

摘要:: 为了揭示长期封育草地深层土壤碳、氮固持及固持速率，采用空间序列代替时间序列的方法，研究了黄土高原宁夏固原云雾山自然保护区长期封育草地土壤有机碳（SOC）、土壤全氮（STN）储量及其固持速率的变化特征。结果表明封育30年草地0—500 cm各土层SOC储量显著高于封育10年草地和放牧草地，封育10年草地不同深度SOC储量与放牧草地并无差异；封育30年、10年和放牧草地STN储量在各土层无统计学上的差异，而封育30年不同深度STN储量显著高于封育10年和放牧草地；封育30年SOC，STN固持主要发生在10~30年间，0—500 cm固持量分别为（482.5±39.3） Mg/hm²，（27.7±2.4） Mg/hm²，封育前10年有机碳、全氮固持量小，分别为（42.8±6） Mg/hm²，（3.4±2.1） Mg/hm²；封育30年0—500 cm土层SOC和STN固持分别为（525.3±62.0） Mg/hm²，（25.0±3.0） Mg/hm²，固持速率分别为（17.5±2.1） Mg/（hm²·a），（0.83±0.3） Mg/（hm²·a）；碳氮比随着封育年限增加而增大，随土层深度增加而降低。封育草地深层土壤有巨大固碳潜力，评估碳氮固持不仅要时间尺度，也要考虑深层土壤碳氮固持，以达到对生态系统碳氮储量评估的无偏估计。

Abstract:: In order to measure soil carbon and nitrogen storages and their sequestration rates in long-term fenced grasslands, different period fenced grasslands in variety location stand for sequential vegetation restoration in Guyuan Yunwushan of the Loess Plateau were selected. The results showed that soil organic carbon(SOC) storage in each soil layers of 0-500 cm soil depth, in 30 years of fenced grassland is significantly higher than in 10 years of fenced grassland and grazing grassland, but there was no significant difference of SOC storage in each soil layer between 10 years of fenced grassland and grazing grassland; there were also no significant difference of soil total nitrogen (STN) storage in different soil layers between 30 years of fenced grassland and 10 years of fenced grassland and grazing grassland, while STN storage in the 30 years of fenced grassland was significantly higher than 10 years of fenced grassland and grazing grassland; meanwhile, during the 30 years of enclosure, the SOC and STN sequestration accumulated dramatically between the 10^th year and the 30^th year, the values were (482.5±39.3) Mg/hm² and (27.7±2.4) Mg/hm², respectively, but during the first 10 years of fenced grassland, the amounts of SOC and STN sequestration were very small, which were (42.8±6) Mg/hm² and (3.4±2.1) Mg/hm², respectively; SOC and STN sequestration in 0-500 cm soil depth after 30 years of enclosure of was (525.3±62.0) Mg/hm² and (25.0±3.0) Mg/hm², respectively, SOC and STN sequestration rates in 0-500 cm soil depth were (17.5±2.1) Mg/(hm²·a) and (0.83±0.3) Mg/(hm²·a); C/N ratio had decreased with increase of soil depth, but it had increased with increase of fencing duration. This study demonstrated that deeper soil layers in fenced grassland have great potential for carbon sequestration, the SOC and STN accumulated mainly happened between the 10^th and 30^th years of enclosure, so, the more attention should be paid to fencing period scales and carbon and nitrogen storage in deeper soil layer in order to achieve unbiased estimate of carbon and nitrogen storage in ecological assessment.

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备注/Memo

收稿日期:2016-05-07;改回日期:2016-05-17。
基金项目:宁夏自然科学基金“黄土高原草地深层土壤有机碳、全氮固持动态对封育的响应”（NZ15049）
作者简介:李建平(1982-),男,陕西人延安人,博士后,主要从事草地生态和模型构建研究。E-mail:lijianpingsas@163.com

更新日期/Last Update: 1900-01-01