| 引用本文: | 乔 英,王环波,陈云飞,等.干旱区枣林水碳通量及水分利用效率研究[J].灌溉排水学报,2025,44(1):8-16. |
| QIAO Ying,WANG Huanbo,CHEN Yunfei,et al.干旱区枣林水碳通量及水分利用效率研究[J].灌溉排水学报,2025,44(1):8-16. |
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| 摘要: |
| 【目的】探究干旱区枣林生态系统的水碳通量和水分利用效率（WUE）动态。【方法】2018、2019年采用涡度协方差技术连续观测干旱区枣林的水碳通量，使用R语言REddyProc包将净生态系统碳通量（NEE）拆分成总生态系统呼吸量（Reco）和总初级生产力（GPP），分析干旱区枣林水碳通量和水分利用效率。【结果】①干旱区枣林蒸散发在非生长季变化平缓，在生长季变化剧烈，2018、2019年总蒸散发分别为657.64、677.40 mm。②枣林碳通量NEE、GPP、Reco的半小时变化和日变化均呈明显季节变化趋势，在非生长季变化平缓，在生长季变化剧烈；2018、2019年NEE年总量分别为-582.40、-494.96 g/(m2·a)，整年度表现为碳汇。③枣林2018、2019年WUE分别为2.08、1.92 g/kg，在生长季呈波动式变化，与暖温带半干旱气候乔木林、胡杨林生态系统的范围相似，但高于小麦农田生态系统。【结论】受温度（土壤温度和空气温度）、太阳辐射、降水及灌溉、作物生长等因素的影响，干旱区枣林生态系统的碳通量季节变化较大，在整年度表现为碳汇，在非生长季表现为碳源。 |
| 关键词: 干旱区；枣林；水碳通量；水分利用效率 |
| DOI：10.13522/j.cnki.ggps.2024075 |
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| Dynamics of water-carbon fluxes and water use efficiency injujube orchards in arid regions |
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QIAO Ying, WANG Huanbo, CHEN Yunfei, KUERBAN·Aili, ZHANG Penghua
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1. Xinjiang Institute of Technology, Aksu 843100, China; 2. Xinjiang Vocational University, Urumqi 830013, China;
3. Neijiang Normal University, Neijiang 641112, China
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| Abstract: |
| 【Objective】Understanding the dynamics of water and carbon fluxes, as well as water use efficiency (WUE) in ecosystems is crucial for optimizing crop yield and improving resource management. This paper experimentally investigated the seasonal dynamics of these processes in jujube orchards located in arid regions in Northwestern China. 【Method】Water and carbon fluxes in a jujube orchard were continuously measured during 2018 and 2019 using the eddy covariance technique. The net ecosystem carbon flux (NEE) measured in the experiment was partitioned into ecosystem respiration (Reco) and gross primary productivity (GPP) using the REddyProc package in R. Seasonal variations in water and carbon fluxes, along with WUE, were analysed based on these data.【Result】① Evapotranspiration showed minimal variation during the dormant period but fluctuated significantly during the reproductive period, with annual total being 657.64 mm in 2018 and 677.40 mm in 2019. ② Seasonal trends were evident in half-hourly and daily variations in carbon flux components (NEE, GPP, and Reco), remaining stable during dormancy but changing markedly during the growing season. Annually, the orchard acted as a carbon sink, with total NEE being -582.4 and -494.96 g/(m2·a) in 2018 and 2019, respectively. ③ The annual WUE was 2.08 and 1.92 g/kg in 2018 and 2019, respectively, fluctuating during the growing season. It was comparable to the WUE of the forest ecosystems in warm temperate and semi-arid regions but exceeded the WUE of wheat farmland ecosystems.【Conclusion】The seasonal variation in carbon flux in jujube orchards in arid regions is influenced by air temperature, solar radiation, precipitation, irrigation, and crop growth. Annually, the orchard acted as a carbon sink, although it emitted more carbon than it sequestered during non-growing seasons. These findings underscore the importance of managing water and carbon fluxes to improve water use efficiency and productivity of jujube orchards in arid regions. |
| Key words: arid areas; jujube forests; water-carbon flux; water use efficiency |
