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| 北亚热带地带性森林土壤温室气体通量对土地利用方式改变和降水减少的响应 | |
| 引用本文： | 菊花,申国珍,马明哲,葛结林,徐文婷,赵常明,张秋良. 北亚热带地带性森林土壤温室气体通量对土地利用方式改变和降水减少的响应[J]. 植物生态学报, 2016, 40(10): 1049-1063. DOI: 10.17521/cjpe.2016.0069 |
| 作者姓名： | 菊花 申国珍 马明哲 葛结林 徐文婷 赵常明 张秋良 |
| 作者单位： | 内蒙古农业大学林学院, 呼和浩特 010019 中国科学院植物研究所植被与环境变化重点实验室, 北京 100093 |
| 基金项目： | 中国科学院战略性先导科技专项(XDA05020303) |
| 摘 要： | 弄清土地利用和降水变化对林地土壤主要温室气体(CO2、CH4和N2O)排放通量变化的影响, 是准确评估森林土壤温室气体排放能力的重要基础。该研究以常绿落叶阔叶混交林原始林、桦木(Betula luminifera)次生林和马尾松(Pinus massoniana)人工林为对象, 采用静态箱-气相色谱法研究了3种土地利用方式(常绿落叶阔叶混交林原始林、桦木次生林和马尾松人工林)和降水减少处理状况下森林土壤CO2、CH4和N2O通量排放特征, 并探讨了其环境驱动机制。研究结果表明: 原始林土壤CH4吸收通量显著高于次生林和人工林, 次生林CH4吸收通量显著高于人工林土壤。人工林土壤CO2排放通量显著高于原始林和次生林土壤。次生林土壤N2O排放通量高于原始林和人工林, 但三者间差异不显著。降水减半显著抑制了3种不同土地利用方式下林地土壤CH4吸收通量; 降水减半处理对原始林和次生林土壤CO2排放通量均具有显著的促进作用, 而对人工林土壤CO2排放通量具有显著的抑制作用; 降水减半处理促进了原始林和人工林林地土壤N2O排放而抑制了次生林林地土壤N2O排放。原始林和次生林林地土壤CH4吸收通量随土壤温度升高显著增加, CH4吸收通量与土壤温度均呈显著相关关系; 原始林、次生林和人工林土壤CO2和N2O排放通量与土壤温度均呈显著正相关关系; 土壤湿度抑制了次生林和人工林土壤CH4吸收通量, 其CH4吸收通量随土壤湿度增加显著减少; 原始林土壤CO2排放通量与土壤湿度呈显著正相关关系。自然状态下, 原始林土壤N2O排放通量与土壤湿度呈显著正相关关系, 原始林和次生林土壤N2O排放通量与硝态氮含量呈显著相关关系。研究结果表明全球气候变化(如降水变化)和土地利用方式的转变将对北亚热带森林林地土壤温室气体排放通量产生显著的影响。 |
| 关 键 词： | 神农架 降水减少 土地利用方式转变 CO2排放 CH4吸收 N2O排放 环境因子 |
Greenhouse gas fluxes of typical northern subtropical forest soils: Impacts of land use change and reduced precipitation |
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| Hua JU,Guo-Zhen SHEN,Ming-Zhe MA,Jie-Lin GE,Wen-Ting XU,Chang-Ming ZHAO,Qiu- Liang ZHANG. Greenhouse gas fluxes of typical northern subtropical forest soils: Impacts of land use change and reduced precipitation[J]. Acta Phytoecologica Sinica, 2016, 40(10): 1049-1063. DOI: 10.17521/cjpe.2016.0069 | |
| Authors: | Hua JU Guo-Zhen SHEN Ming-Zhe MA Jie-Lin GE Wen-Ting XU Chang-Ming ZHAO Qiu- Liang ZHANG |
| Affiliation: | College of Forestry, Inner Mongolia Agricultural University, Huhhot 010019, China andState Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China |
| Abstract: | Aims It is important to study the effects of land use change and reduced precipitation on greenhouse gas fluxes (CO2, CH4 and N2O) of forest soils. Methods The fluxes of CO2, CH4 and N2O and their responses to environmental factors of primary forest soil, secondary forest soil and artificial forest soil under a reduced precipitation regime were explored using the static chamber and gas chromatography methods during the period from January to December in 2014. Important findings Results indicate that CH4 uptake of primary forest soil ((-44.43 ± 8.73) μg C·m-2·h-1) was significantly higher than that of the secondary forest soil ((-21.64 ± 4.86) μg C·m-2·h-1) and the artificial forest soil ((-10.52 ± 2.11) μg C·m-2·h-1). CH4 uptake of the secondary forest soil ((-21.64 ± 4.86) μg C·m-2·h-1) was significantly higher than that of the artificial forest ((-10.52 ± 2.11) μg C·m-2·h-1). CO2 emissions of the artificial forest soil ((106.53 ± 19.33) μg C·m-2·h-1) were significantly higher than that of the primary forest soil ((49.50 ± 8.16) μg C·m-2·h-1) and the secondary forest soil ((63.50 ± 5.35) μg C·m-2·h-1) (p < 0.01). N2O emissions of the secondary forest soil ((1.91 ± 1.22) μg N·m-2·h-1) were higher than that of the primary forest soil ((1.40 ± 0.28) μg N·m-2·h-1) and the artificial forest soil ((1.01 ± 0.86) μg N·m-2·h-1). Reduced precipitation (-50%) had a significant inhibitory effect on CH4 uptake of the artificial forest soil, while it enhanced CO2 emissions of the primary forest soil and the secondary forest soil. Reduced precipitation had a significant inhibitory effect on CO2 emissions of the artificial forest soil and N2O emissions of the secondary forest (p < 0.01). Reduced precipitation promotes N2O emissions of the primary forest soil and the artificial forest soil. CH4 uptake of the primary forest and the secondary forest soil increased significantly with the increase of soil temperature under natural and reduced precipitation. CO2 and N2O emission fluxes of the primary forest soil, secondary forest soil and artificial forest soil were positively correlated with soil temperature (p < 0.05). Soil moisture inhibited CH4 uptake of the secondary forest soil and the artificial forest soil (p < 0.05). CO2 emissions of the primary forest soil were significantly positively correlated with soil moisture (p < 0.05). N2O emissions of primary forest soil and secondary forest soil were significantly correlated with the nitrate nitrogen content (p < 0.05). It was implied that reduced precipitation and land use change would have significant effects on greenhouse gas emissions of subtropical forest soils. |
| Keywords: | Mt. Shennongjia precipitation reduction land use change emissions of CO2 uptake of CH4 emissions of N2O environmental factors |
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