内蒙古大兴安岭地区落叶松林氧同位素比值日变化及蒸散定量区分

doi:10.17521/cjpe.2025.0072

植物生态学报 ›› 2026, Vol. 50 ›› Issue (4): 959-970.DOI: 10.17521/cjpe.2025.0072 cstr: 32100.14.cjpe.2025.0072

内蒙古大兴安岭地区落叶松林氧同位素比值日变化及蒸散定量区分

李佳泽¹^,², 贾德彬¹^,^*(), 郝玉胜¹, 郝帅², 尚紫琴¹, 纪明宇¹

¹ 内蒙古农业大学水利与土木建筑工程学院, 旱区水工程生态环境全国重点实验室, 呼和浩特 010018
² 内蒙古大兴安岭森林生态系统国家野外科学观测研究站, 内蒙古根河 022350

收稿日期:2025-02-26 接受日期:2025-05-28 出版日期:2026-04-20 发布日期:2026-06-29
通讯作者: ^*贾德彬(jdb@imau.edu)
基金资助:
国家自然科学基金(52169003);内蒙古自然科学基金联合项目(2023LHMS05024)

Diurnal variation of oxygen isotope ratio and quantitative partitioning of evapotranspiration in Larix gmelinii forest in Da Hinggan Ling of Nei Mongol, China

LI Jia-Ze¹^,², JIA De-Bin¹^,^*(), HAO Yu-Sheng¹, HAO Shuai², SHANG Zi-Qin¹, JI Ming-Yu¹

¹ College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, National Key Laboratory of Water Engineering and Ecological Environment in Arid Regions, Hohhot 010018, China
² Forest Ecosystem National Observation and Research Station of Da Hinggan Ling in Nei Mongol, Genhe, Nei Mongol 022350, China

Received:2025-02-26 Accepted:2025-05-28 Online:2026-04-20 Published:2026-06-29
Contact: ^*JIA De-Bin(jdb@imau.edu)
Supported by:
National Natural Science Foundation of China(52169003);Nei Mongol Natural Science Foundation Joint Project(2023LHMS05024)

摘要/Abstract

摘要： 为了更加深入全面地了解大兴安岭森林生态系统大气水汽浓度、水汽同位素比值以及蒸散发各组分在植物不同生长季和日尺度上的变化规律, 该研究通过水汽稳定同位素分析仪对不同高度水汽浓度及同位素比值进行了高频观测, 同时采用真空提取和液态水同位素分析仪测定植物和土壤稳定氧同位素比值(δ¹⁸O)。利用同位素稳态(ISS)和同位素非稳态(NSS)理论, 对不同时期的落叶松(Larix gmelinii)生态系统进行蒸散发组分拆分与比较。结果表明: 在落叶松生长旺盛期(7-8月)大气水汽浓度和水汽同位素富集, 而落叶松落叶期贫化; 两者在日尺度的变化上则较为复杂, 呈现高—低—高的“V”形循环。在日尺度变化上, 土壤蒸发水汽氧同位素比值的变化范围为-27.15‰- -18.31‰, 生态系统蒸散发水汽氧同位素比值的变化范围为-15.48‰- -8.05‰, 两者均呈现单峰型变化趋势。ISS下植物蒸腾水汽氧同位素比值为-10.83‰- -5.31‰, 而NSS下植物蒸腾水汽氧同位素比值为-12.21‰- -6.63‰, 其中在13:00-17:00时间段上差异最小, 蒸腾占比最为接近。总体上, 植物蒸腾量对蒸散量的贡献率在ISS下为69.48%-85.08%, NSS下为76.38%-91.05%, 这表明研究区土壤蒸发耗水远小于植被蒸腾耗水, 植被蒸腾在森林生态系统蒸散发中起主导作用。

关键词: 稳定同位素, 大气水汽, 落叶松, 蒸散发, 非稳态假设

Abstract:

Aims To comprehensively investigate the dynamics of atmospheric water vapor concentration, water vapor isotopes, and evapotranspiration components in the forest ecosystem of the Da Hinggan Ling across different plant growing seasons and at a diurnal scale.

Methods This study conducted high-frequency monitoring of water vapor concentrations and isotopes at different heights using a stable water vapor isotope analyzer, while also determining the oxygen stable isotope ratio (δ¹⁸O) of plants and soil using vacuum extraction and a liquid water isotope analyzer. Additionally, evapotranspiration components in the Larix gmelinii forest were partitioned and compared across different periods by applying Isotope Steady-State (ISS) and Non-Steady-State (NSS) theories.

Important findings During the vigorous growing period of Larix gmelinii (July-August), atmospheric water vapor concentration and isotopic enrichment were elevated, whereas depletion occurred during the leaf-fall period. Diurnal variations exhibited a complex “V” shaped cycle with high-low-high fluctuations. On the diurnal scale, the δ¹⁸O of soil evaporation vapor ranged from -27.15‰ to -18.31‰, while that of ecosystem evapotranspiration vapor varied between -15.48‰ and -8.05‰, both demonstrating unimodal trends. Under ISS conditions, the δ¹⁸O of plant transpiration vapor spanned -10.83‰ to -5.31‰, contrasting with -12.21‰ to -6.63‰ under NSS conditions. Minimal divergence between ISS and NSS estimates occurred during 13:00-17:00, where transpiration contributions showed closest alignment. Overall, the transpiration contribution to evapotranspiration was 69.48%-85.08% (ISS) and 76.38%-91.05% (NSS), indicating substantially lower soil evaporation compared to vegetation transpiration, with plant transpiration dominating the forest ecosystem’s evapotranspiration.

Key words: stable isotope, vapor, Larix gmelini, evapotranspiration, non-steady-state assumption

李佳泽, 贾德彬, 郝玉胜, 郝帅, 尚紫琴, 纪明宇. 内蒙古大兴安岭地区落叶松林氧同位素比值日变化及蒸散定量区分. 植物生态学报, 2026, 50(4): 959-970. DOI: 10.17521/cjpe.2025.0072

LI Jia-Ze, JIA De-Bin, HAO Yu-Sheng, HAO Shuai, SHANG Zi-Qin, JI Ming-Yu. Diurnal variation of oxygen isotope ratio and quantitative partitioning of evapotranspiration in Larix gmelinii forest in Da Hinggan Ling of Nei Mongol, China. Chinese Journal of Plant Ecology, 2026, 50(4): 959-970. DOI: 10.17521/cjpe.2025.0072

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2025.0072

https://www.plant-ecology.com/CN/Y2026/V50/I4/959

图/表 10

图1 实验装置及采样高度示意图。

Fig. 1 Schematic diagram of the experiment set-up and sampling heights.

图2 内蒙古大兴安岭地区落叶松林水汽浓度及稳定氧同位素比值(δ18O)分布特征。

Fig. 2 Vapor concentration and oxygen stable isotope ratio (δ18O) distribution characteristics in the Larix gmelinii forest in the Da Hinggan Ling of Nei Mongol.

图3 内蒙古大兴安岭地区落叶松林不同高度水汽浓度日变化。A, 7月15日。B, 8月15日。C, 9月15日。D, 10月15日。

Fig. 3 Daily variation of water vapor concentration at different heights in the Larix gmelinii forest in the Da Hinggan Ling of Nei Mongol. A, July 15th. B, August 15th. C, September 15th. D, October 15th.

图4 内蒙古大兴安岭地区落叶松林不同高度水汽稳定氧同位素比值(δ18O)日变化。A, 7月15日。B, 8月15日。C, 9月15日。D, 10月15日。

Fig. 4 Daily variation of vapor oxygen stable isotope ratio (δ18O) at different heights in the Larix gmelinii forest in the Da Hinggan Ling of Nei Mongol. A, July 15th. B, August 15th. C, September 15th. D, October 15th.

表1 利用Craig-Gordon模型计算得到的内蒙古大兴安岭地区落叶松林δs、δv和δE

Table 1 δs, δv and δE in the Larix gmelinii forest in the Da Hinggan Ling of Nei Mongol calculated by Craig-Gordon model

日期 Date	时间 Time	δ_s (‰)	δ_v (‰)	δ_E(‰)	日期 Date	时间 Time	δ_s (‰)	δ_v (‰)	δ_E(‰)
2022-07-15	6:00-8:00	-9.90	-18.64	-20.76	2022-09-15	6:00-8:00	-11.69	-21.82	-22.91
	8:00-10:00	-8.56	-17.37	-18.96		8:00-10:00	-11.03	-20.21	-21.92
	10:00-12:00	-8.30	-16.52	-18.55		10:00-12:00	-10.72	-20.21	-21.39
	12:00-14:00	-8.25	-16.81	-18.31		12:00-14:00	-10.06	-19.56	-20.59
	14:00-16:00	-9.08	-16.74	-19.22		14:00-16:00	-10.65	-19.74	-21.03
	16:00-18:00	-9.84	-16.82	-20.29		16:00-18:00	-11.33	-20.37	-21.83
	18:00-20:00	-10.44	-17.35	-21.14		18:00-20:00	-12.01	-20.86	-23.00
2022-08-15	6:00-8:00	-9.27	-17.89	-21.01	2022-10-15	6:00-8:00	-14.39	-24.54	-26.76
	8:00-10:00	-8.88	-16.36	-19.71		8:00-10:00	-13.81	-24.60	-26.14
	10:00-12:00	-8.41	-16.44	-18.79		10:00-12:00	-13.25	-23.81	-25.50
	12:00-14:00	-8.17	-16.06	-18.48		12:00-14:00	-13.54	-23.11	-25.78
	14:00-16:00	-8.33	-16.17	-18.57		14:00-16:00	-13.86	-22.92	-26.16
	16:00-18:00	-8.86	-18.00	-19.51		16:00-18:00	-14.09	-23.66	-26.48
	18:00-20:00	-9.51	-17.90	-20.54		18:00-20:00	-14.60	-24.19	-27.15

图5 非稳态和稳态假设下落叶松蒸腾水汽氧同位素比值(δT-NSS、δT-ISS)日变化。

Fig. 5 Diurnal variation of Larix gmelinii transpiration oxygen stable isotope ratio under unsteady state and steady state assumes (δT-NSS, δT-ISS).

表2 利用Keeling Plot模型估算得到的内蒙古大兴安岭地区落叶松林δET

Table 2 δET of the Larix gmelinii forest in the Da Hinggan Ling of Nei Mongol calculated by Keeling Plot

日期 Date	时间 Time	δ_ET (‰)	δ_T-NSS (‰)	δ_T-ISS(‰)	日期 Date	时间 Time	δ_ET (‰)	δ_T-NSS (‰)	δ_T-ISS(‰)
2022-07-15	6:00-8:00	-9.88	-8.24	-5.69	2022-09-15	6:00-8:00	-13.27	-11.13	-9.03
	8:00-10:00	-9.55	-7.33	-6.08		8:00-10:00	-12.43	-10.30	-8.58
	10:00-12:00	-8.74	-7.31	-5.31		10:00-12:00	-11.21	-9.74	-7.87
	12:00-14:00	-8.06	-6.63	-5.69		12:00-14:00	-10.28	-8.81	-7.90
	14:00-16:00	-8.22	-6.94	-5.83		14:00-16:00	-10.85	-9.36	-8.35
	16:00-18:00	-9.00	-6.95	-5.90		16:00-18:00	-11.73	-9.64	-8.73
	18:00-20:00	-9.63	-6.95	-6.25		18:00-20:00	-13.22	-10.75	-9.25
2022-08-15	6:00-8:00	-10.99	-8.98	-7.81	2022-10-15	6:00-8:00	-15.48	-11.99	-10.53
	8:00-10:00	-10.01	-8.36	-7.10		8:00-10:00	-13.72	-10.47	-9.04
	10:00-12:00	-8.90	-7.59	-6.38		10:00-12:00	-12.60	-10.08	-8.92
	12:00-14:00	-8.05	-7.02	-6.03		12:00-14:00	-11.17	-9.20	-8.32
	14:00-16:00	-8.71	-7.56	-6.47		14:00-16:00	-11.21	-9.44	-8.59
	16:00-18:00	-9.58	-7.90	-6.82		16:00-18:00	-12.93	-10.21	-9.14
	18:00-20:00	-10.17	-8.36	-7.08		18:00-20:00	-15.29	-12.21	-10.83

图6 非稳态(A)和稳态(B)假设下落叶松林蒸腾占蒸散的比例。

Fig. 6 Proportion of evapotranspiration in Larix gmelinii forest under unsteady (A) and steady state (B) assumption.

图7 大气水汽稳定氧同位素比值(δ18O)与环境因子之间的相关性。橙色代表生长季(7-8月), 蓝色代表落叶季(9-10月)。直线表示线性回归关系。

Fig. 7 Relationships of atmospheric water vapor oxygen isotope value (δ18O) with environmental factors. Orange, growing season (July to August); blue, leaf senescence period (September to October). Solid lines, linear regression fits.

图8 落叶松林蒸腾对蒸散的贡献率(平均值±标准差)。A, 7月15日。B, 8月15日。C, 9月15日。D, 10月15日。δT-NSS, 非稳态下蒸腾水汽稳定氧同位素比值(δ18O); δT-ISS, 稳态下蒸腾水汽δ18O; FT, 植物蒸腾对蒸散发的贡献率。

Fig. 8 Contribution rate of transpiration to evapotranspiration in Larix gmelinii forest (mean ± SD). A, July 15th. B, August 15th. C, September 15th. D, October 15th. δT-NSS, oxygen stable isotope ratio (δ18O) of plant transpiration vapor under Non-Steady-Stateconditions; δT-ISS, the δ18O of plant transpiration vapor under isotope steady-stateconditions; FT, the contribution of plant transpiration to evapotranspiration.

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内蒙古大兴安岭地区落叶松林氧同位素比值日变化及蒸散定量区分

Diurnal variation of oxygen isotope ratio and quantitative partitioning of evapotranspiration in Larix gmelinii forest in Da Hinggan Ling of Nei Mongol, China

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