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首页> 外文期刊>Ecological research >Changes in soil carbon flux and carbon stock over a rotation of poplar plantations in northwest China
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Changes in soil carbon flux and carbon stock over a rotation of poplar plantations in northwest China

机译：杨树人工林轮作过程中土壤碳通量和碳储量的变化

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Forest soil is a major component of terrestrial ecosystems for carbon sequestration and plays an important role in the global carbon cycle. Soil carbon flux and soil carbon pools were investigated in a poplar plantation chronosequence over a rotation in northwest China. Based on continuous field observation in 2007, the results showed that mean soil CO_2 efflux rate was 5.54, 4.81, and 3.93 μmol CO_2 m~(-2) s~(-1) for stands of 2-, 8-, and 15-year-old, respectively, during the growing season. Significant differences in soil respiration of three age classes were mainly because soil temperature, carbon allocation, and fine root growth changed greatly with stand age. Multiple regression analysis suggested that soil temperature and fine root biomass in the upper layer could explain 78-85% of the variation in soil respiration. Mineral soil C stock at 0-40 cm depth was 55.77, 55.09, and 58.14 t ha~(-1) in the 2-, 8-, and 15-year-old stands, respectively. The average rate of soil C sequestration was 0.13 t ha~(-1) year~(-1) following afforestation on former crop lands. Although the plantations had similar management practices and soil types since their establishment, many biotic and abiotic factors such as root biomass and turnover rate, soil condition of the plantations had undergone marked changes at different development stages, which could result in the remarkable differences in soil carbon flux and storage over a rotation. Our results highlight the importance of the development stage within a rotation of poplar plantation in assessment of soil carbon budget.
机译：森林土壤是陆地生态系统中固碳的主要组成部分，在全球碳循环中发挥着重要作用。在西北地区，以轮作的杨树人工林时间序列对土壤碳通量和土壤碳库进行了研究。根据2007年的连续田间观测，结果表明，在2、8和15-林分林分中，平均土壤CO_2外排率分别为5.54、4.81和3.93μmolCO_2 m〜（-2）s〜（-1）。在生长季节分别年岁。三种年龄类别的土壤呼吸的显着差异主要是由于土壤温度，碳分配和细根生长随林龄的变化很大。多元回归分析表明，上层土壤温度和细根生物量可以解释土壤呼吸变化的78-85％。在2岁，8岁和15岁的林分中，0-40 cm深度的矿质土壤碳库分别为55.77、55.09和58.14 t ha〜（-1）。退耕前造林后土壤固碳的平均速率为0.13 t ha〜（-1）年〜（-1）。人工林自建立以来虽然具有相似的经营管理方式和土壤类型，但许多生物和非生物因素，例如根的生物量和周转率，人工林的土壤状况在不同的发育阶段都经历了明显的变化，这可能导致土壤的显着差异。碳通量和旋转存储。我们的结果强调了杨树人工林轮作阶段的发展对评估土壤碳收支的重要性。

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