汉江流域水体溶解性有机碳来源及转化过程

doi:10.13292/j.1000-4890.202610.028

生态学杂志 ›› 2026, Vol. 45 ›› Issue (10): 3190-3197.doi: 10.13292/j.1000-4890.202610.028

• ·生态水文过程与系统韧性专栏·（专栏组稿专家：董建志、孙守琴、薛宝林） • 上一篇下一篇

汉江流域水体溶解性有机碳来源及转化过程

韩伽骏¹,张东^1*,孙瀚林¹,吴娜²,贺美丽²,张俊文²,赵志琦²,杨小溪¹,于婧淼¹

(¹上海海洋大学海洋科学与生态环境学院，上海 210306； ²长安大学地球科学与资源学院，西安 710054)

出版日期:2026-10-10 发布日期:2027-04-12

Sources and transformation processes of dissolved organic carbon in the Hanjiang River Basin.

HAN Jiajun¹, ZHANG Dong^1*, SUN Hanlin¹, WU Na², HE Meili², ZHANG Junwen², ZHAO Zhiqi², YANG Xiaoxi¹, YU Jingmiao¹

(¹College of Oceanography and Ecological Science, Shanghai Ocean University, Shanghai 201306, China; ²School of Earth Science and Resources, Chang’an University, Xi’an 710054, China).

Online:2026-10-10 Published:2027-04-12

摘要/Abstract

摘要： 溶解性有机碳(DOC)是全球碳循环的重要碳库，为微生物和水生植物提供碳源，其浓度可以反映环境中有机污染物的输入与转化，同位素组成能解析降水过程和土地利用变化对水体生态系统的影响。汉江是丹江口水库水体重要来源，但目前对汉江流域水体DOC来源及转化过程尚不清楚。本研究收集丰水期汉江流域干流、支流及沿岸地下水水体样品，分析水体DOC浓度以及碳同位素(δ¹³C_DOC)组成，结合水化学指标和水体氢氧同位素组成，辨析自然因素与人为活动对流域水体DOC的影响。结果表明：(1)干流、支流和地下水中DOC浓度均值分别为2.34 mg·L^-1(n=28)、2.59 mg·L^-1(n=30)和1.56 mg·L^-1(n=17)，其δ¹³C_DOC值均值分别为-28.3‰(n=28)、-28.9‰(n=30)和-25.6‰(n=17)。(2)土壤有机质分解是上游自然背景地区水体DOC主要来源，对干流水体DOC的贡献比例为64%～91%，均值为72%。生活污水输入及内源释放对汉江中下游平原地区DOC来源影响增加。(3)地下水还原环境中DOC降解显著，造成DOC浓度降低，δ¹³C_DOC值升高。研究表明，丹江口水库上游水体DOC来源以自然过程为主，人为活动以及内源释放影响不大，研究结果为汉江流域水资源管理提供重要的科学依据。

关键词: 汉江流域, 溶解性有机碳, 碳同位素, 自然过程, 人为活动

Abstract: Dissolved organic carbon (DOC) represents a crucial carbon reservoir in the global carbon cycle, serving as a carbon source for microorganisms and aquatic plants. Its concentration can reflect the input and transformation of organic pollutants, while its isotope compositions provide insights into the impacts of precipitation and land-use changes on aquatic ecosystems. Hanjiang River is the primary water source of the Danjiangkou Reservoir, which plays a pivotal role in regional water quality. Yet, the sources and transformation processes of DOC in the water bodies of the Hanjiang River Basin remain poorly understood. We collected water samples from the mainstream, tributaries, and adjacent groundwater in the Hanjiang River Basin during the wet season. DOC concentrations and δ¹³C_DOC values of water samples were analyzed. Combined with hydrochemical parameters and stable isotopes of water hydrogen and oxygen (δD and δ¹⁸O), we examined the influence of natural processes and anthropogenic activities on the DOC in the river basin. The results showed that: (1) Mean DOC concentrations were 2.34 mg·L^-1 (n=28) in the mainstream, 2.59 mg·L^-1 (n=30) in tributaries, and 1.56 mg·L^-1 (n=17) in groundwater, while mean δ¹³C_DOC values were -28.3‰, -28.9‰, and -25.6‰, respectively. (2) Soil organic matter decomposition was the primary source of DOC in the upstream natural background areas, contributing 64%-91% (with a mean of 72%) to the mainstream DOC. In contrast, domestic sewage input and internal release increasingly exerted influences on DOC sources in the middle-lower plain regions. (3) DOC degradation occurred in the reducing environment of groundwater, leading to reduced DOC concentrations and enriched δ¹³C_DOC values. These results demonstrate that the DOC sources in the upstream areas of the Danjiangkou Reservoir are predominantly controlled by natural processes, with minimal influence from anthropogenic activities and internal release, providing scientific support for water resource management in the Hanjiang River Basin.

Key words: Hanjiang River Basin, dissolved organic carbon, carbon isotope, natural process, anthropogenic activity

韩伽骏, 张东, 孙瀚林, 吴娜, 贺美丽, 张俊文, 赵志琦, 杨小溪, 于婧淼. 汉江流域水体溶解性有机碳来源及转化过程[J]. 生态学杂志, 2026, 45(10): 3190-3197.

HAN Jiajun, ZHANG Dong, SUN Hanlin, WU Na, HE Meili, ZHANG Junwen, ZHAO Zhiqi, YANG Xiaoxi, YU Jingmiao. Sources and transformation processes of dissolved organic carbon in the Hanjiang River Basin.[J]. Chinese Journal of Ecology, 2026, 45(10): 3190-3197.

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汉江流域水体溶解性有机碳来源及转化过程

Sources and transformation processes of dissolved organic carbon in the Hanjiang River Basin.

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