三种方法测定高寒草甸生态系统蒸散比较
Comparison of three methods for measurement of evapotranspiration in an alpine meadow
查看参考文献28篇
文摘
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利用涡度相关技术(Eddy covariance technique)、小型蒸渗仪(Mini—lysimeter)和波文比-能量平衡法(BREB)对2005年和2006年夏季(7—8月份)青藏高原海北高寒草甸生态系统的昼间蒸散(E)变化进行了对比观测研究。在观测期间,存在能量不闭合现象,涡度相关系统测定的湍流通量相当于有效能量的73%。3种不同方法测定的蒸散量之间具有较好的相关性,涡度相关系统与小型蒸渗仪测定的蒸散量相关系数达0.96,与波文比法的结果相关系数为0.95。然而,波文比法计算的蒸散量最大,比涡度相关系统的观测值高43%;小型蒸渗仪法的测定值次之,比涡度相关法的观测值高19%;涡度相关法测算的蒸散值最小。研究结果表明,利用涡度相关技术测定该高寒草甸生态系统的潜热通量,可能会过小评价该生态系统的蒸散量。 |
其他语种文摘
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The daytime evapotranspiration (E) was measured using the eddy covariance (EC) technique, the minilysimeter method, and the Bowen ratio-energy balance (BREB) method, in an alpine meadow ecosystem on the Qinghai-Tibetan plateau during the growing season of 2005 and 2006 (Jul. - Aug.). The energy imbalance with a slope of 0.73 was found in this study. Results showed a significant correlation between the E measured with the three methods, with the correlation coefficient of 0.96 between the EC technique and the mini-lysimeter method, and 0.95 between the EC technique and the BREB method. However, the value of E measured by the BREB was the largest, which was 43% higher than that by the EC; whilst the E measured with the mini-lysimeter had the medium value, which was 19% higher than that by the EC. The results suggest that the E may be underestimated using the EC in this alpine meadow on the Qinghai-Tibet Plateau. |
来源
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生态学报
,2008,28(1):202-211 【核心库】
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关键词
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蒸散
;
波文比
;
涡度相关技术
;
小型蒸渗仪
;
高寒草甸
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地址
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1.
中国科学院西北高原生物研究所, 青海, 西宁, 810008
2.
日本国立环境研究所, 筑波, 3050053
3.
日本国立农业环境技术研究所, 筑波, 3058604
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1000-0933 |
学科
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普通生物学;植物学 |
基金
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中国科学院“百人计划”项目
;
日本环境厅全球环境研究基金(S-1)
;
国家自然科学基金
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文献收藏号
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CSCD:3204720
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