亚热带森林源头溪流植物残体与沉积物钙、镁储量动态特征

doi:10.13292/j.1000-4890.202504.029

生态学杂志 ›› 2025, Vol. 44 ›› Issue (4): 1057-1064.doi: 10.13292/j.1000-4890.202504.029

亚热带森林源头溪流植物残体与沉积物钙、镁储量动态特征

马弟婷,赵泽敏,胡婉榕,彭艳,袁朝祥,倪祥银,吴福忠,岳楷^*

（福建师范大学地理科学学院、碳中和未来技术学院，湿润亚热带生态地理过程教育部室，福州 350117）

出版日期:2025-04-10 发布日期:2025-04-08

Dynamics of calcium and magnesium storage in plant litter and sediments of a subtropical forest headwater stream.

MA Diting, ZHAO Zemin, HU Wanrong, PENG Yan, YUAN Chaoxiang, NI Xiangyin, WU Fuzhong, YUE Kai^*

(School of Geographical Sciences, School of Carbon Neutrality Future Technology, Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou 350117, China).

Online:2025-04-10 Published:2025-04-08

摘要/Abstract

摘要： 植物残体和沉积物是森林源头溪流生态系统营养元素储存与迁移的重要载体，对下游水体物质循环过程产生重要影响。本研究以福建三明闽江上游森林集水区一条典型的源头溪流为对象，于2021年3月至2022年2月监测了溪流中植物残体和沉积物中钙、镁浓度和储量的时空动态特征。结果表明：（1）植物残体钙、镁元素浓度的最大值分别在12月和10月，分别为15557.72和970.98 mg·kg^-1，沉积物钙、镁元素浓度分别于8月和5月达到最大值，分别为1840.61和576.74 mg·kg^-1；（2）植物残体钙、镁储量最大值出现在4月，平均值为1.27和0.09 g·m^-2，而沉积物钙元素储量最大值出现在8月，平均值为130.76 g·m^-2，镁元素储量最大值出现在5月，平均值为46.77 g·m^-2；（3）在空间动态上，植物残体钙、镁元素储量在溪流源头最大，而沉积物钙镁元素储量在河段中下游的一个汇流处储量最大；（4）溪流理化特征，特别是流量、水温、月降雨量、月降雨频率和水体溶解氧对植物残体和沉积物钙、镁的储量和浓度具有显著影响。这些研究结果为深入认识亚热带森林源头溪流在生态系统养分储存与迁移过程中的生态作用提供了科学基础数据。

关键词: 养分循环, 溪流特征, 支流汇入, 钙, 镁

Abstract: Plant litter and sediments play a crucial role in the storage and migration of nutrients in forest headwater streams, and can significantly impact material cycling in downstream waters. We examined the spatial and temporal dynamics of calcium (Ca) and magnesium (Mg) concentrations and storage in plant litter and sediments of a subtropical forest headwater stream from March 2021 to February 2022 in the upper reaches of Minjiang River, Sanming, Fujian. Results showed that: (1) The maximum concentrations of Ca and Mg in plant litter were 15557.72 and 970.98 mg·kg^-1 in December and October, respectively. The highest concentrations of sediment Ca and Mg were 1840.61 and 576.74 mg·kg^-1 in August and May, respectively. (2) The highest storage of plant litter Ca and Mg was observed in April, with average values of 1.27 and 0.09 g·m^-2, respectively, while those of sediment Ca and Mg occurred in August and May, with average values of 130.76 and 46.77 g·m^-2, respectively. (3) The largest storage of plant litter Ca and Mg occurred in the source reach, whereas that of sediments occurred in a sampling site with confluence at the middle-lower reaches of the stream. (4) Stream physical and chemical properties, particularly discharge, water temperature, monthly rainfall, rainfall frequency, and dissolved oxygen, significantly affected the storage and concentrations of Ca and Mg in plant litter and sediments. These results will help to better understand the role of forest headwater streams in nutrient storage and fluxes in subtropical forests.

Key words: nutrient cycle, stream characteristics, inflow of tributary, calcium, magnesium

马弟婷, 赵泽敏, 胡婉榕, 彭艳, 袁朝祥, 倪祥银, 吴福忠, 岳楷. 亚热带森林源头溪流植物残体与沉积物钙、镁储量动态特征[J]. 生态学杂志, 2025, 44(4): 1057-1064.

MA Diting, ZHAO Zemin, HU Wanrong, PENG Yan, YUAN Chaoxiang, NI Xiangyin, WU Fuzhong, YUE Kai. Dynamics of calcium and magnesium storage in plant litter and sediments of a subtropical forest headwater stream.[J]. Chinese Journal of Ecology, 2025, 44(4): 1057-1064.

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亚热带森林源头溪流植物残体与沉积物钙、镁储量动态特征

Dynamics of calcium and magnesium storage in plant litter and sediments of a subtropical forest headwater stream.

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