青藏高原高寒草地小流域水体碳氮输出特征及其影响因素
Variation and Influence Factors of Carbon and Nitrogen in Water in An Alpine Grassland Watershed, Tibetan Plateau
查看参考文献28篇
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文摘
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以青藏高原长江源区典型高寒草地小流域为研究对象,基于2012年小流域气象监测数据和小流域径流水样分析,探讨了小流域水体碳氮输出特征,分析了气象因子和土壤水热对小流域水体碳氮输出的影响。结果表明,径流水体碳氮质量浓度均较低,其中可溶性有机碳(DOC)、可溶性有机氮(DON)、铵态氮(NH_4~+-N)和硝态氮(NO_3~--N)含量分别在2.95~6.96mg·L~(-1)、0.45~1.15mg·L~(-1)、0.02~0.88mg·L~(-1)和0.16~0.36mg·L~(-1)之间;DOC、DON、NO_3~--N在8~10月份之间随时间逐渐升高,9月中旬达到峰值后波动下降,NH_4~+-N无显著的季节变化特征,溶解氮中DON>N03--N>NH_4~+-N;DOC和DON的输出量与降水、不同土层(20、40、60、90、120cm)地温和不同深度(10、20、40、60cm)土壤水分、水温呈极显著正相关(P<0.001),与90、120cm土壤水分呈极显著负相关(P<0.001);NH_4~+-N的输出量与降水、气温、水温呈显著正相关(P<0.05);NO_3~-N与降水呈极显著正相关(P<0.001)。 |
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其他语种文摘
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This study was conducted to analyze the variation characteristics of carbon and nitrogen contents in water during the growing season in an alpine grassland watershed in the Tibetan Plateau. The results show that the dissolved carbon (DOC), dissolved organic nitrogen (DON), ammonium nitrogen (NH_4~+-N)and nitrate nitrogen (NO_3~--N) concentration in water of the alpine grassland watershed are respectively 2.95 -6.96mg·L~(-1), 0.45-1.15mg·L~(-1), 0.02-0.88mg·L~(-1) and 0.16-0.36mg·L~(-1). DOC, DON and NO_3~--N increased to a peak in the middle of September and then decreased, however, NH_4~+-N had no significant seasonal variation characteristics. The dissolved nitrogen concentration is DON >NO_3~-N >NH_4~+-N. Precipitation, soil temperature at 20, 40,60,90, 120cm depth, and soil moisture at 10,20,40,60cm depth have significant positive correlation (P<0.001) with DOC and DON contents in the water. There is a significant positive correlation (P<0.05) between NH_4~+-N and precipitation, air and water temperature. The NO_3~--N has a significant positive correlation with precipitation. |
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来源
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水文
,2018,38(2):46-52 【核心库】
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关键词
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青藏高原
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高寒草地
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小流域
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碳氮输出
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地址
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中国科学院水利部成都山地灾害与环境研究所, 四川, 成都, 610041
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中国科学院大学资源与环境学院, 北京, 100049
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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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1000-0852 |
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学科
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环境科学基础理论 |
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基金
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国家973计划
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国家自然科学基金项目
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文献收藏号
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CSCD:6214844
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