Atmospheric deposition (dry and wet deposition) is one of the primary sources of chemical inputs to terrestrial ecosystems and replenishes the nutrient pool in forest eco-systems. Precipitation often acts as a primary transporting agent and solvent; thus, nutrient cycles in forests are closely linked to hydrological processes. We collected precipita-tion data during a growing season to explore variations in nutrient cycling and nutrient balances in the rainfall redis-tribution process (wet deposition) in a larch plantation in northeast China. We measured nutrient ( NO?3 , PO3?4 , Cl ? , K, Ca, Na, and Mg) inputs via bulk precipitation, throughfall and stemflow, and used a canopy budget model to estimate nutrient fluxes via canopy exchange. Our results suggest that the average concentrations of the base cation (K, Ca, Na, and Mg) showed the following order: stemflow > through-fall > bulk precipitation. Throughfall and stemflow chemistry dramatically fluctuated over the growing season when net fluxes (throughfall + stemflow—bulk precipitation) of NO?3 , PO3?4 , SO24? , Cl ? , K, Ca, Na, and Mg were ? 6.676 kg·ha ?1 , ? 1.094 kg·ha ?1 , ? 2.371 kg·ha ?1 , 1.975 kg·ha ?1 , 0.470 kg ·ha ?1 , ? 5.202 kg·ha ?1 , ? 0.336 kg·ha ?1 , and 1.397 kg·ha ?1 , respectively. These results suggest that NO?3 , PO3?4 , SO2?4 , Ca, and Na were retained, while Cl ? , K, and Mg were washed offby throughfall and stemflow.

Houcai Sheng;Na Guo;Cunyong Ju;Tijiu Cai

Center for Ecological Research,Northeast Forestry University,Harbin 150040,People's Republic of China;Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education,Northeast Forestry University,Harbin 150040,People's Republic of China;College of Food Engineering,East University of Heilongjiang,Harbin 150040,People's Republic of China

林业研究（英文版）

[1]Houcai Sheng;Na Guo;Cunyong Ju;Tijiu Cai-.Variation of nutrient fluxes by rainfall redistribution processes in the forest canopy of an urban larch plantation in northeast China)[J].林业研究（英文版）,2022(04):1259-1269

replenishes,Throughfall,offby

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