土壤水分波动对高寒草甸生态系统CO_2和N_2O排放的影响
Effect of soil moisture fluctuations on CO_2 and N_2O emission in alpine meadow ecosystem
查看参考文献26篇
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文摘
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受地形和气候的影响,高寒草地土壤经历着频繁的土壤水分波动过程,为探索土壤水分波动对青藏高原高寒草甸生态系统CO_2和N_2O排放的影响,采用原状土柱模拟土壤由高含水量(60 cm~3·cm~(-3))到低含水量(30 cm~3·cm~(-3))再到高含水量(60 cm~3·cm~(-3))的波动过程,各阶段持续时间相应为38、57和46 d,并以恒定含水量(60 cm~3·cm~(-3))为对照,研究了高寒草甸生态系统CO_2和N_2O的释放量及其与土壤温湿度、土壤铵态氮(NH_4~+ -N) 、硝态氮(NO_3~--N)和可溶性有机碳(DOC)的关系。结果表明,土壤水分波动增加了高寒草甸生态系统CO_2排放通量。在土壤水分波动过程中,CO_2排放通量与土壤温度呈正指数关系;在开始的高含水量阶段,CO_2排放与DOC含量有显著正相关关系(P < 0.05),但在低含水量阶段,相关性不明显(P > 0.05);土壤水分波动显著降低了N_2O的排放(P < 0.05) 。恒湿对照的N_2O通量与其土壤NH_4~+ -N含量呈极显著负相关关系(P < 0.01),土壤水分波动处理的N_2O通量与土壤NH_4~+ -N和NO_3~--N含量相关性均不显著(P > 0.05) 。 |
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其他语种文摘
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Under the influence of topography and climate,plateau grassland soil experiences frequent soil moisture fluctuations. To explore the influence of soil moisture fluctuations on CO_2 and N_2O emission from alpine meadows in the Qinghai-Tibet Plateau,we used an undisturbed soil column to simulate soil water content fluctuation from a high (60 cm~3·cm~(-3)) to low value (30 cm~3·cm~(-3)),and to a high (60 cm~3·cm~(-3)) again; this duration of each phase was 38,57,and 46 days. A soil column with constant HYPERLINK“javascript:; ”humidity level (soil humidity 60 cm~3· cm~(-3)) was considered the control. The results showed that: 1) soil moisture fluctuations significantly increased CO_2 emission. A significant relationship was observed between CO_2 emission and soil temperature; additionally,CO_2 emission correlated positively with soil dissolved organic carbon (DOC) concentration in the first high soil-water content phase. 2) Moisture fluctuations significantly decreased N_2O emission. In the control treatment,there was a strong significant negative correlation between N_2O emission and NH_4~+ -N; however,no close relation between N_2O emission and NH_4~+-N level was observed throughout the moisture fluctuation process. |
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来源
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草业科学
,2018,35(2):266-275 【核心库】
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DOI
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10.11829/j.issn.1001-0629.2016-0241
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关键词
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高寒草甸生态系统
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土壤水分波动
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土壤可溶性有机碳
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二氧化碳
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硝态氮
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铵态氮
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地址
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1.
甘肃农业大学资源与环境学院, 甘肃, 兰州, 730070
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中国科学院成都山地灾害与环境研究所, 四川, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-0629 |
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学科
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农业基础科学;畜牧、动物医学、狩猎、蚕、蜂 |
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基金
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国家973计划
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国家自然科学基金
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成都山地灾害与环境研究所青年百人团队计划
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文献收藏号
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CSCD:6192755
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