亚热带地区常绿阔叶林SPAC系统水分的氢氧稳定同位素特征

doi:10.13287/j.1001-9332.202009.017

应用生态学报 ›› 2020, Vol. 31 ›› Issue (9): 2875-2884.doi: 10.13287/j.1001-9332.202009.017

亚热带地区常绿阔叶林SPAC系统水分的氢氧稳定同位素特征

李龙¹, 唐常源^1,2*, 曹英杰¹

¹中山大学环境科学与工程学院, 广州 510006;
²中山大学地理科学与规划学院, 广州 510275

收稿日期:2020-03-20 接受日期:2020-07-08 出版日期:2020-09-15 发布日期:2021-03-15
通讯作者: * E-mail: tangchy3@mail.sysu.edu.cn
作者简介:李龙, 男, 1995年生, 硕士研究生。主要从事森林水文和同位素水文研究。E-mail: 610399841@qq.com
基金资助:
国家自然科学基金项目(41877470)和广东省自然科学基金项目(2017A030313229)资助

Hydrogen and oxygen stable isotope characteristics of water in SPAC system of evergreen broadleaved forest in subtropical region

LI Long¹, TANG Chang-yuan^1,2*, CAO Ying-jie¹

¹School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China;
²School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China

Received:2020-03-20 Accepted:2020-07-08 Online:2020-09-15 Published:2021-03-15
Contact: * E-mail: tangchy3@mail.sysu.edu.cn
Supported by:
the National Natural Science Foundation of China (41877470) and the Natural Science Foundation of Guangdong Province, China (2017A030313229).

摘要/Abstract

摘要： 森林的土壤-植物-大气连续体(SPAC)是陆地重要的水循环连续界面过程。本研究通过分析亚热带常绿阔叶林的降水、大气水汽、土壤水、叶片水的同位素组成,探讨森林SPAC系统水分的氢氧同位素组成特征以及植物蒸腾与叶片性状和环境因子的关系。结果表明: 研究区大气降水、土壤水、竹柏枝条水、竹柏叶片水和大气水汽的δD-δ¹⁸O线性回归方程分别为: δD_P=7.97δ¹⁸O_P+12.68(R²=0.97)、δD_S=4.29δ¹⁸O_S-18.62(R²=0.81)、δD_B=3.31δ¹⁸O_B-29.73(R²=0.49)、δD_L=1.49δ¹⁸O_L-10.09(R²=0.81)、δD_V=3.89δ¹⁸O_V-51.29(R²=0.46)。在降水→土壤水→植物水的界面水输送过程中,氢氧同位素逐渐富集,而从土壤蒸发和从植物蒸腾的水汽同位素贫化。在降水和蒸发作用的影响下,土壤水同位素随深度增加有贫化的趋势,而且整体上旱季土壤水同位素比雨季富集。观测期间,枝条水同位素比土壤水略微富集,说明水分在植物体内运输过程中存在受到蒸腾富集作用的可能性。旱季,乔木的枝条水同位素比灌木贫化,说明根系分布更深的乔木植物更倾向于利用深层土壤水。由于在叶片性状、蒸腾速率以及对环境因子的响应程度等方面存在差异,不同植物的叶片水同位素组成随叶龄增长的变化特征有所不同。雨季的环境条件更有利于叶片蒸腾,使雨季的叶片水同位素比旱季富集。叶片水同位素组成与植物叶片含水量呈正相关关系,与相对湿度呈负相关关系,综合反映了植物应对环境变化的水分调控功能。

关键词: 土壤-植物-大气连续体, 氢氧稳定同位素, 叶龄, 蒸腾, 环境因子

Abstract: Forest soil-plant-atmosphere continuum (SPAC) is an important continuous process of water cycle. In this study, we analyzed hydrogen and oxygen stable isotope compositions of the precipitation, atmospheric water vapor, soil water, branch water, and leaf water to explain the characteristics of the continuous process and the associated controlling factors in a subtropical evergreen broadleaved forest. The results showed that the regression equations between hydrogen and oxygen stable isotopes were δD_P=7.97δ¹⁸O_P+12.68(R²=0.97) for precipitation, δD_S=4.29δ¹⁸O_S-18.62(R²=0.81) for soil water, δD_B=3.31δ¹⁸O_B-29.73(R²=0.49) for branch water and δD_L=1.49δ¹⁸O_L-10.09(R²=0.81) for leaf water of Podocarpus nagi, δD_V=3.89δ¹⁸O_V-51.29(R²=0.46) for atmospheric water vapor, respectively. In the process of water transport from precipitation to soil water to plant water, hydrogen and oxygen isotopes gradually enrich, while water vapor isotopes evaporated from soil and evaporated from plants were depleted. With the influence of precipitation and evaporation, soil water isotopes depleted with depth, and more enriched in the dry season than that in the rainy season. During the observation period, isotope content of branch water was slightly higher than that of soil water, indicating that water might be enriched by transpiration during the transportation process in plants. In the dry season, water isotope in branches of arbor plants was poorer than that of shrubs, indicating that arbor plants with deeper root distribution tended to use deep soil water. Because of the differences of leaf traits, transpiration rate and the response degree of environmental factors, the variation characteristics of water isotope composition in leaves of diffe-rent plants varied with the increases of leaf age. Environmental conditions in rainy season were more conducive to leaf transpiration, which made leaf water isotope enriched in rainy season than in dry season. The isotopic compositions in leaf water of Podocarpus nagi had a positive relationship with leaf water content (LWC), and a negative one with relative humidity, reflecting the water regulation function of plants in response to environmental changes.

Key words: soil-plant-atmosphere continuum (SPAC), hydrogen and oxygen stable isotopes, leaf age, transpiration, environmental factor

李龙, 唐常源, 曹英杰. 亚热带地区常绿阔叶林SPAC系统水分的氢氧稳定同位素特征[J]. 应用生态学报, 2020, 31(9): 2875-2884.

LI Long, TANG Chang-yuan, CAO Ying-jie. Hydrogen and oxygen stable isotope characteristics of water in SPAC system of evergreen broadleaved forest in subtropical region[J]. Chinese Journal of Applied Ecology, 2020, 31(9): 2875-2884.

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亚热带地区常绿阔叶林SPAC系统水分的氢氧稳定同位素特征

Hydrogen and oxygen stable isotope characteristics of water in SPAC system of evergreen broadleaved forest in subtropical region

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