Antti-Jussi Lindroos, Hannu Ilvesniemi. (2023). Weathering rates of Ca and Mg related to granitic and gabbro mineralogy in boreal forest soils and the effect of mechanical soil disturbance on weathering release. Silva Fennica vol. 57 no. 1 article id 10648. https://doi.org/10.14214/sf.10648

Keywords: ploughing; base cations; rotation period; mineral soil weathering

Highlights: Weathering rates were higher in the gabbro than the granitic areas; Weathering was an important Ca and Mg source to forest trees, and it increased after mechanical soil disturbance.

Abstract | Full text in HTML | Full text in PDF | Author Info

This study’s aim was to calculate the weathering rates of Ca and Mg for five boreal forest soils in southern Finland on granitic and gabbro containing bedrock. The effect of mineralogy on the total concentrations of Ca and Mg in soil and weathering rates was evaluated. The aim was also to estimate the effect of mechanical soil disturbance related to ploughing on the weathering in the gabbro area. The total concentrations of SiO₂, CaO, MgO, and Zr were determined by XRF, and weathering rates of Ca and Mg were determined based on the changes in the CaO, MgO, and Zr concentrations. The weathering rates of Ca+Mg varied 5–38 mmol_c m^–2 year^–1 in the E+B/BC horizons among the plots. Soil disturbance related to ploughing increased the weathering of Ca and Mg largely in the disturbed part of the topmost mineral soil as indicated by the decreasing concentrations of Ca and Mg after mechanical soil disturbance. The weathering input of Ca in the undisturbed soil did not fully replace the Ca output in final whole-tree cutting. The weathering input of Mg in the undisturbed soil was sufficient to replace the lost Mg in stemwood harvesting but not on all the plots the lost Mg in whole-tree harvesting. Weathering rates were higher in the gabbro than the granitic areas.

Lindroos, Natural Resources Institute Finland (Luke), Natural resources, Latokartanonkaari 9, FI-00790 Helsinki, Finland E-mail: antti.lindroos@luke.fi
Ilvesniemi, Natural Resources Institute Finland (Luke), Production systems, Latokartanonkaari 9, FI-00790 Helsinki, Finland E-mail: hannu.ilvesniemi@luke.fi

article id 327, category Research article

Gong Zhang, Guang-ming Zeng, Yi-min Jiang, Chun-yan Du, Guo-he Huang, Jia-mei Yao, Mei Zeng, Xi-lin Zhang, Wei Tan. (2006). Seasonal dry deposition and canopy leaching of base cations in a subtropical evergreen mixed forest, China. Silva Fennica vol. 40 no. 3 article id 327. https://doi.org/10.14214/sf.327

Keywords: throughfall; bulk precipitation; dry deposition; canopy exchange; base cations; evergreen forest

Abstract | View details | Full text in PDF | Author Info

We evaluated the dry deposition and canopy leaching fluxes of base cations in the growing and the dormant seasons using the Na-ratio method based on the 4-year (2000–2003) monitoring data in Shaoshan subtropical evergreen mixed forest, China. The dry deposition of base cations in the growing seasons was lower than that in the dormant seasons, while the canopy leaching of base cations was higher in the growing seasons than that in the dormant seasons. The precipitation quantity and H⁺ significantly impacted the canopy leaching processes. The annual canopy leaching of K⁺, Ca²⁺ and Mg²⁺ accounted for 88, 46 and 38% of net throughfall flux, respectively. The canopy retention of proton (H⁺ and NH₄⁺) is close to the canopy leaching of base cations calibrated by weak acids, indicating that the canopy cations leaching is neutralizing acid precipitation.

Zhang, College of Environmental Science and Engineering, Hunan University, Hunan Province, Changsha 410082, P.R. China; Hunan Environmental Protection Bureau, Hunan Province, Changsha, 410076, P.R. China E-mail: gz@nn.cn
Zeng, College of Environmental Science and Engineering, Hunan University, Hunan Province, Changsha 410082, P.R. China E-mail: zgming@hnu.cn
Jiang, College of Environmental Science and Engineering, Hunan University, Hunan Province, Changsha 410082, P.R. China; Hunan Environmental Protection Bureau, Hunan Province, Changsha, 410076, P.R. China E-mail: ymj@nn.cn
Du, College of Environmental Science and Engineering, Hunan University, Hunan Province, Changsha 410082, P.R. China E-mail: cyd@nn.cn
Huang, College of Environmental Science and Engineering, Hunan University, Hunan Province, Changsha 410082, P.R. China E-mail: ghh@nn.cn
Yao, Xiangya Hospital, Central-south University, Hunan Province, Changsha 410008, P.R. China E-mail: jmy@nn.cn
Zeng, College of Environmental Science and Engineering, Hunan University, Hunan Province, Changsha 410082, P.R. China E-mail: mz@nn.cn
Zhang, College of Environmental Science and Engineering, Hunan University, Hunan Province, Changsha 410082, P.R. China E-mail: xlz@nn.cn
Tan, College of Environmental Science and Engineering, Hunan University, Hunan Province, Changsha 410082, P.R. China E-mail: wt@nn.cn

article id 423, category Research article

Olle Rosenberg, Staffan Jacobson. (2004). Effects of repeated slash removal in thinned stands on soil chemistry and understorey vegetation. Silva Fennica vol. 38 no. 2 article id 423. https://doi.org/10.14214/sf.423

Keywords: carbon; nitrogen; thinning; base cations; soil chemistry; understorey vegetation; whole-tree harvesting

Abstract | View details | Full text in PDF | Author Info

The increased interest in harvesting logging residues as a source of bio-energy has led to concerns about the potentially adverse long-term impact of the practice on site productivity. The aim of this study was to examine the effects on soil chemistry (pH, C, N and AL-extractable P, K, Ca and Mg) in three different soil layers (FH, 0–5 cm and 5–10 cm mineral soil) and understorey vegetation after the second removal of logging residues in whole-tree thinned stands. The study was performed at four different sites, established in the period 1984–87, representing a range of different climatic and soil conditions: a very fertile Norway spruce (Picea abies (L.) Karst.) site in south-western Sweden and three Scots pine (Pinus sylvestris L.) sites located in south, south-central and central Sweden. The effects of whole-tree thinning on soil chemistry and understorey vegetation were generally minor and variable. Across all sites the concentrations of Ca and Mg were significantly lower when slash was removed.

Rosenberg, Skogforsk – The Forestry Research Institute of Sweden, Uppsala Science Park, SE-751 83 Uppsala, Sweden E-mail: olle.rosenberg@skogforsk.se
Jacobson, Skogforsk – The Forestry Research Institute of Sweden, Uppsala Science Park, SE-751 83 Uppsala, Sweden E-mail: sj@nn.se

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