[1]程功,刘廷玺,王冠丽,等.科尔沁沙丘-草甸梯级生态系统CO2,CH4和N2O通量特征[J].水土保持研究,2019,26(04):96-104,110.
　CHENG Gong,LIU Tingxi,WANG Guanli,et al.Characteristics of CO2, CH4 and N2O Fluxes in Horqin Dune-Meadow Cascade Ecosystem[J].Research of Soil and Water Conservation,2019,26(04):96-104,110.
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科尔沁沙丘-草甸梯级生态系统CO2,CH4和N2O通量特征

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 26 期数: 2019年04期 页码: 96-104,110 栏目: 出版日期: 2019-06-11
Title:
Characteristics of CO2, CH4 and N2O Fluxes in Horqin Dune-Meadow Cascade Ecosystem
作者:
程功1,3, 刘廷玺1,2, 王冠丽1,2, 段利民1,2, 马立群1
1. 内蒙古农业大学 水利与土木建筑工程学院, 呼和浩特 010018;
2. 内蒙古自治区水资源保护与利用重点试验室, 呼和浩特 010018;
3. 南京市水利规划设计院股份有限公司, 南京 210000
Author(s):
CHENG Gong1,3, LIU Tingxi1,2, WANG Guanli1,2, DUAN Limin1,2, MA Liqun1
1. Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot 010018, China;
3. Nanjing Water Conservancy Planning, Design Institute Corporation Limited, Nanjing 210000, China
关键词:
科尔沁; 温室气体; 有机质; 土壤温度; 土壤含水量
Keywords:
Horqin; greenhouse gases flux; organic matter; soil temperature; soil moisture
分类号:
S152;X16
摘要:
为了明确科尔沁沙丘—草甸梯级生态系统中不同生态系统生育期内温室气体通量变化规律及其影响因素，采用静态箱—气相色谱法，于2017年5—10月对呈梯级分布的半流动沙丘、半固定沙丘、人工林地、农田（玉米）和草甸湿地CO2，CH4和N2O通量进行了原位观测，并同步测量取样点的土壤温度、土壤含水量、土壤总有机质含量、总磷含量和总氮含量。对温室气体通量及其影响因子之间进行了相关分析，结果表明：科尔沁沙丘—草甸梯级生态系统上温室气体通量均具有明显的季节性变化，温室气体通量受到土壤含水量和土壤温度的显著影响，二者共同作用促进了温室气体通量的吸收或排放。在干旱半干旱地区，土壤含水量显著影响着土壤温室气体通量对土壤温度的敏感性，土壤温室气体通量随着温度的增加而增大，同时土壤含水量超过田间持水率时，土壤温室气体通量又会随着土壤含水量的增大而降低，从而影响土壤温室气体通量对土壤温度的响应。CO2通量的温度敏感性（Q10）表现为：农田（4.18）> 草甸湿地（2.87）> 人工林地（2.51）> 半固定沙丘（2.41）> 半流动沙丘（2.36）。CO2排放峰值出现在水热条件较好的7月、8月，其中8月22日附近的排放峰值明显高于7月21日附近的排放峰值。3种温室气体通量均值呈现出梯级变化（换算为CO2）：半流动沙丘[181.65 mg/（m2·h）] < 半固定沙丘[242.16 mg/（m2·h）] < 人工林地[348.33 mg/（m2·h）] < 农田[405.72 mg/（m2·h）] < 草甸湿地[（487.63 mg/（m2·h）]。试验区土壤总有机质含量、总磷含量也呈现出相同的梯级变化，生育期CO2通量与土壤中总有机质含量和总磷含量呈极显著正相关（p < 0.01）。生育期内N2O通量的变异对土壤温度的响应更强烈。
Abstract:
In order to study the variation pattern of greenhouse gas fluxes and the influencing factors in different areas of Horqin sand dune-meadow cascade ecological belt, we used the static chamber-GC technique and conducted in situ observations of CO2, CH4 and N2 O fluxes in semi-mobile dunes, semi-fixed dunes, artificial forest land, farmland (maize) and meadows from May to October, 2017, and simultaneously measured soil temperature, soil moisture, total carbon, total phosphorus and total nitrogen. Correlation analysis on greenhouse gas fluxes and the influencing factors showed that the greenhouse gas fluxes in the Horqin sand dune-meadow ecological belt had obvious seasonal changes, which was significantly affected by soil moisture and soil temperature. The combination of the two promoted the absorption or emission of greenhouse gas fluxes. In arid and semi-arid regions, the sensibility of soil greenhouse gas fluxes to soil temperature is highly dependent on soil moisture. The soil greenhouse gas fluxes increase with the increase of the temperature. When soil moisture exceeds the field water holding capacity, the soil greenhouse gas fluxes will decrease with the increase of soil moisture, which affects the response of the soil greenhouse gas fluxes to soil temperature. Temperature sensitivity of CO2 (Q10) decreased in the order: farmland (4.18) > meadow (2.87) > artificial forest land (2.51) > semi-fixed sand dune (2.41) > semi-mobile dune (2.36). The peak of CO2 emission appeared in July and August when the hydrothermal condition was better, and the peak around August 22 was significantly higher than that around July 21. The average roll of three greenhouse gas fluxes (converted to CO2) increased in the order: semi-mobile dunes [181.65 mg/(m2·h)] < semi-fixed dunes [242.16 mg/(m2·h)] < artificial forest land [348.33 mg/(m2·h)] < farmland [405.72 mg/(m2·h)] < meadows [487.63 mg/(m2·h)]. Organic matter and total phosphorus of the soil in the test area also showed the same change. The CO2 flux in the growing season showed significantly positive correlation with organic matter and total phosphorus of the soil (p < 0.01). Soil N2O flux is more responsive to soil temperature in the growing season.

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备注/Memo

收稿日期:2018-10-18;改回日期:2018-11-02。
基金项目:国家自然科学基金（51620105003，51139002，51669017）；教育部科技创新团队滚动发展计划（IRT_17R60）；科技部重点领域创新团队（2015RA4013）；内蒙古自治区草原英才创业创新人才团队、内蒙古农业大学寒旱区水资源利用创新团队（NDTD2010-6）
作者简介:程功(1993-),男,黑龙江大庆人,在读硕士研究生,研究方向为温室气体通量。E-mail:18645979803@163.com
通讯作者:刘廷玺(1966-),男,内蒙古赤峰人,教授,博士生导师,主要从事生态水文与资源环境研究。E-mail:txliu1966@163.com

更新日期/Last Update: 1900-01-01