Petaja Guna, Bārdule Arta, Zalmanis Juris, Lazdiņa Dagnija, Daugaviete Mudrīte, Skranda Ilona, Zvaigzne Zaiga Anna, Purviņa Dana
Latvian State Forest Research Institute "Silava", Riga Street 111, LV-2169 Salaspils, Latvia.
Latvia University of Life Sciences and Technologies, Liela Street 2, LV-3001 Jelgava, Latvia.
Plants (Basel). 2023 Jun 9;12(12):2264. doi: 10.3390/plants12122264.
This study investigates the soil organic carbon (SOC) and whole tree biomass carbon (C), soil bulk density (BD) as well as changes in these parameters in afforested areas in Latvia. The study covered 24 research sites in afforested areas-juvenile forest stands dominated by Scots pine, Norway spruce and Silver birch. The initial measurements were conducted in 2012 and repeated in 2021. The results show that afforestation mostly leads to a general decrease in soil BD and SOC stock in 0-40 cm soil layer and an increase in C stock in tree biomass across afforested areas with various tree species, soil types, and former land uses. The physical and chemical properties of the soil could explain the differences in changes in soil BD and SOC caused by afforestation, as well as the impact of past land use may have persisted. When comparing the changes in SOC stock with the increase in C stock in tree biomass due to afforestation, taking into account the decrease in soil BD and the resulting elevation of soil surface level, the afforested areas at juvenile development stage can be considered a net C sink.
本研究调查了拉脱维亚造林地区的土壤有机碳（SOC）、整树生物量碳（C）、土壤容重（BD）以及这些参数的变化。该研究涵盖了24个造林地区的研究地点——以苏格兰松、挪威云杉和银桦为主的幼龄林分。初始测量于2012年进行，并于2021年重复进行。结果表明，造林大多导致0至40厘米土层的土壤BD和SOC储量普遍下降，以及不同树种、土壤类型和以前土地利用方式的造林地区树木生物量中的C储量增加。土壤的物理和化学性质可以解释造林引起的土壤BD和SOC变化差异，以及过去土地利用的影响可能持续存在。在比较造林导致的SOC储量变化与树木生物量中C储量的增加时，考虑到土壤BD的下降以及由此导致的土壤表面水平升高，幼龄发育阶段的造林地区可被视为一个净碳汇。
