Dynamics of Ca and Mg storage of non-woody debris in a subtropical forest headwater stream during the rainy season.

doi:10.13287/j.1001-9332.202211.001

Abstract

Abstract: Forest headwater streams are the monumental cement for relating habitats of the terrene and water. Nutri-ent dynamics of non-woody debris in stream can directly and indirectly regulate the cycle and transport of forest nutrients, for example, Ca and Mg. In the rainy season (from March to August) of 2021, we monitored the dyna-mics of Ca and Mg storage of non-woody debris in a typical headwater stream in a subtropical forest. The results showed that total Ca and Mg storage of non-woody debris per unit area of stream ranged from 178.1 to 890.5 mg·m^-2 and 13.8 to 61.6 mg·m^-2 during the rainy season, respectively. The Ca and Mg storages of non-woody debris per unit area of stream during the rainy season displayed a pattern of first increase and then decrease, and overall a decrease pattern. The storage varied significantly among different sites, with higher values in stream source than others. The total Ca and Mg storage of non-woody debris positively correlated with precipitation, but negatively with stream water alkalinity, temperature, and dissolved oxygen. The variation of riparian forest type (e.g., Castano-psis carlesii forests or mixed coniferous forests) and with or without tributaries did not affect the storage of Ca and Mg in stream non-woody debris. During the rainy season, total Ca and Mg storage of non-woody debris in the headwater stream from forest generally decreased over time, which was mainly controlled by the characteristics of rainfall and stream.

Key words: nutrient, stream characteristics, riparian dominant tree species, tributary confluence

JIN Xia, WU Fu-zhong, HU Wan-rong, WANG Yuan, ZHAO Ze-min, PENG Yan, NI Xiang-yin, YUE Kai. Dynamics of Ca and Mg storage of non-woody debris in a subtropical forest headwater stream during the rainy season.[J]. Chinese Journal of Applied Ecology, 2022, 33(11): 2936-2942.

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