采用静态箱-气相色谱法与相对生长方程法,同步测定小兴安岭7种天然沼泽湿地(草丛沼泽-C、灌丛沼泽-G、毛赤杨沼泽-M、白桦沼泽-B、落叶松苔草沼泽-L-T、落叶松藓类沼泽-L-X、落叶松泥炭藓沼泽-L-N)的土壤呼吸(CO_2、CH_4)净碳排放量、...采用静态箱-气相色谱法与相对生长方程法,同步测定小兴安岭7种天然沼泽湿地(草丛沼泽-C、灌丛沼泽-G、毛赤杨沼泽-M、白桦沼泽-B、落叶松苔草沼泽-L-T、落叶松藓类沼泽-L-X、落叶松泥炭藓沼泽-L-N)的土壤呼吸(CO_2、CH_4)净碳排放量、植被年净固碳量,并依据生态系统净碳收支平衡,揭示温带天然沼泽湿地的碳源/汇作用规律。结果表明:(1)7种天然沼泽CH_4年通量(0.006—7.756 mg m^(-2)h^(-1))呈M(高于其他类型1.0—1291.7倍,P<0.05)>C、G、B(高于针叶林沼泽17.7—649.0倍,P>0.05)>针叶林沼泽变化趋势,其季节动态存在3种类型(C、G单峰型、M、B多峰型及针叶林沼泽排放与吸收交替型);(2)其CO_2年通量(157.40—231.06 mg m^(-2)h^(-1))呈G(高于森林沼泽28.7%—46.8%,P<0.05)>C(高于森林沼泽7.4%—22.5%,P>0.05)>森林沼泽的变化趋势,其季节动态存在2种类型(C、G、L-X和L-N双峰型和M、B、L-T单峰型);(3)C、G、M、B、L-N CH_4排放仅受0—40 cm不同土壤层温度所控制;7种天然沼泽土壤CO_2排放均受气温及0—40 cm不同土壤层温度所控制,但B、L-X、L-N受温度与水位综合控制;(4)其植被年净固碳量((2.05±0.09)—(6.75±0.27)t C hm-2a-1)呈C(高于其他类型65.4%—229.3%,P<0.05)>G、B、L-T、L-X、L-N(高于M 80.0%—99.0%,P<0.05)>M变化趋势;(5)7种天然沼泽的碳源/汇(-2.32—2.09 t C hm-2a-1)作用不同,C、B和L-N为碳吸收汇(C强汇、B和L-N弱汇),M、G、L-T和L-X则为碳排放源(M、G强源、L-T和L-X弱源)。因此,温带小兴安岭草丛沼泽为碳强汇、灌丛沼泽为碳强源、森林沼泽基本维持碳平衡(除M外)。展开更多
Most aquatic ecosystems contribute elevated N2 O to atmosphere due to increasing anthropogenic nitrogen loading. To further understand the spatial heterogeneity along an aquatic continuum from the upriver to wetland t...Most aquatic ecosystems contribute elevated N2 O to atmosphere due to increasing anthropogenic nitrogen loading. To further understand the spatial heterogeneity along an aquatic continuum from the upriver to wetland to lake to downriver, the study was conducted on spatial variations in N2 O emission along Poyang Lake aquatic continuum during the flood season from 15 July 2013 to 10 August 2013. The results showed the N2 O concentrations, the ratio of N2O/dinitrogen（N2） gases production, N2 O emission and denitrification rates ranged from 0.10 to 1.11 μg N/L,- 0.007% to 0.051%,- 9.73 to 127 μg N/m2/hr and 1.33 × 104to31.9 × 104μg N2/m2/hr, respectively, across the continuum. The average N2 O concentrations,the ratio of N2O/N2 and N2O emission was significantly lower in wetlands as compared to the rivers and lake（p 〈 0.01）. The significantly high denitrification rate and low N2 O emission together highlighted that most N2 O can be converted into N2 via near complete denitrification in the Poyang Lake wetlands. Our study suggests that the wetlands might impact N2 O budget in an integrated aquatic ecosystems. Moreover, N2 O emission from different aquatic ecosystem should be considered separately when quantifying the regional budget in aquatic ecosystem.展开更多
自然湿地因具有重要的生态功能而受到全球科学研究者的广泛关注。为全面了解自然湿地领域的研究现状及发展趋势,选取Web of Science数据库,利用VOSviewer可视化分析软件对2009—2018年自然湿地研究领域发表的SCI论文进行文献计量分析。...自然湿地因具有重要的生态功能而受到全球科学研究者的广泛关注。为全面了解自然湿地领域的研究现状及发展趋势,选取Web of Science数据库,利用VOSviewer可视化分析软件对2009—2018年自然湿地研究领域发表的SCI论文进行文献计量分析。结果表明:(1)自然湿地研究在全球的受重视程度越来越高,近10年发文量呈波动式增长趋势,中国和美国在该领域进行了大量研究,是发文数量最多的两个国家;(2)中国科学院在自然湿地领域的发文数量和总被引频次都位居首位;(3)《Ecological Engineering》《Wetlands》《Science of the Total Environment》是该领域刊载论文量排名前3的期刊;(4)自然湿地领域发展涉及环境科学与生态学、水资源学、工程学、地质学、海洋和淡水生物学等多学科协作,学科交叉融合趋势明显;(5)研究热点主要集中在湿地生物多样性与湿地管理、植被恢复、泥炭地碳排放、湿地水文特征等方面。文献计量学分析能够为自然湿地范畴的研究工作提供一定参考,增进国际、各研究机构交流合作,推动学科交叉融合,加强机理性研究等应是未来一段时间自然湿地领域的重点方向。展开更多
文摘采用静态箱-气相色谱法与相对生长方程法,同步测定小兴安岭7种天然沼泽湿地(草丛沼泽-C、灌丛沼泽-G、毛赤杨沼泽-M、白桦沼泽-B、落叶松苔草沼泽-L-T、落叶松藓类沼泽-L-X、落叶松泥炭藓沼泽-L-N)的土壤呼吸(CO_2、CH_4)净碳排放量、植被年净固碳量,并依据生态系统净碳收支平衡,揭示温带天然沼泽湿地的碳源/汇作用规律。结果表明:(1)7种天然沼泽CH_4年通量(0.006—7.756 mg m^(-2)h^(-1))呈M(高于其他类型1.0—1291.7倍,P<0.05)>C、G、B(高于针叶林沼泽17.7—649.0倍,P>0.05)>针叶林沼泽变化趋势,其季节动态存在3种类型(C、G单峰型、M、B多峰型及针叶林沼泽排放与吸收交替型);(2)其CO_2年通量(157.40—231.06 mg m^(-2)h^(-1))呈G(高于森林沼泽28.7%—46.8%,P<0.05)>C(高于森林沼泽7.4%—22.5%,P>0.05)>森林沼泽的变化趋势,其季节动态存在2种类型(C、G、L-X和L-N双峰型和M、B、L-T单峰型);(3)C、G、M、B、L-N CH_4排放仅受0—40 cm不同土壤层温度所控制;7种天然沼泽土壤CO_2排放均受气温及0—40 cm不同土壤层温度所控制,但B、L-X、L-N受温度与水位综合控制;(4)其植被年净固碳量((2.05±0.09)—(6.75±0.27)t C hm-2a-1)呈C(高于其他类型65.4%—229.3%,P<0.05)>G、B、L-T、L-X、L-N(高于M 80.0%—99.0%,P<0.05)>M变化趋势;(5)7种天然沼泽的碳源/汇(-2.32—2.09 t C hm-2a-1)作用不同,C、B和L-N为碳吸收汇(C强汇、B和L-N弱汇),M、G、L-T和L-X则为碳排放源(M、G强源、L-T和L-X弱源)。因此,温带小兴安岭草丛沼泽为碳强汇、灌丛沼泽为碳强源、森林沼泽基本维持碳平衡(除M外)。
基金supported by the Research Program of State Key Laboratory of Lake Science and Environment(No.2012SKL012)CAS Key Project(No.KJZD-EW-TZ-G10)+1 种基金the National Basic Research Program(973)of China(No.2012CB417005)the Poyang Lake Wetland Integrated Research Station for their help on field study
文摘Most aquatic ecosystems contribute elevated N2 O to atmosphere due to increasing anthropogenic nitrogen loading. To further understand the spatial heterogeneity along an aquatic continuum from the upriver to wetland to lake to downriver, the study was conducted on spatial variations in N2 O emission along Poyang Lake aquatic continuum during the flood season from 15 July 2013 to 10 August 2013. The results showed the N2 O concentrations, the ratio of N2O/dinitrogen（N2） gases production, N2 O emission and denitrification rates ranged from 0.10 to 1.11 μg N/L,- 0.007% to 0.051%,- 9.73 to 127 μg N/m2/hr and 1.33 × 104to31.9 × 104μg N2/m2/hr, respectively, across the continuum. The average N2 O concentrations,the ratio of N2O/N2 and N2O emission was significantly lower in wetlands as compared to the rivers and lake（p 〈 0.01）. The significantly high denitrification rate and low N2 O emission together highlighted that most N2 O can be converted into N2 via near complete denitrification in the Poyang Lake wetlands. Our study suggests that the wetlands might impact N2 O budget in an integrated aquatic ecosystems. Moreover, N2 O emission from different aquatic ecosystem should be considered separately when quantifying the regional budget in aquatic ecosystem.
文摘自然湿地因具有重要的生态功能而受到全球科学研究者的广泛关注。为全面了解自然湿地领域的研究现状及发展趋势,选取Web of Science数据库,利用VOSviewer可视化分析软件对2009—2018年自然湿地研究领域发表的SCI论文进行文献计量分析。结果表明:(1)自然湿地研究在全球的受重视程度越来越高,近10年发文量呈波动式增长趋势,中国和美国在该领域进行了大量研究,是发文数量最多的两个国家;(2)中国科学院在自然湿地领域的发文数量和总被引频次都位居首位;(3)《Ecological Engineering》《Wetlands》《Science of the Total Environment》是该领域刊载论文量排名前3的期刊;(4)自然湿地领域发展涉及环境科学与生态学、水资源学、工程学、地质学、海洋和淡水生物学等多学科协作,学科交叉融合趋势明显;(5)研究热点主要集中在湿地生物多样性与湿地管理、植被恢复、泥炭地碳排放、湿地水文特征等方面。文献计量学分析能够为自然湿地范畴的研究工作提供一定参考,增进国际、各研究机构交流合作,推动学科交叉融合,加强机理性研究等应是未来一段时间自然湿地领域的重点方向。
