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首页> 外文期刊>Journal of Plant Research >How did climate drying reduce ecosystem carbon storage in the forest-steppe ecotone? A case study in Inner Mongolia, China
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How did climate drying reduce ecosystem carbon storage in the forest-steppe ecotone? A case study in Inner Mongolia, China

机译：气候干燥如何减少森林草原过渡带的生态系统碳储存？中国内蒙古的案例研究

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The projected recession of forests in the forest-steppe ecotone under projected climate drying would restrict the carbon sink function of terrestrial ecosystems. Previous studies have shown that the forest-steppe ecotone in the southeastern Inner Mongolia Plateau originally resulted from climate drying and vegetation shifts during the mid- to late-Holocene, but the interrelated processes of changing soil carbon storage and vegetation and soil shifts remain unclear. A total of 44 forest soil profiles and 40 steppe soil profiles were excavated to determine soil carbon storage in deciduous broadleaf forests (DBF), coniferous forests (CF) and steppe (ST) in this area. Carbon density was estimated to be 106. 51 t/hm~2 (DBF), 73.20 t/hm~2 (CF), and 28.14 t/hm~2 (ST) for these ecosystems. Soil organic carbon (SOC) content was negatively correlated with sand content (R = -0.879, P < 0.01, n = 42), and positively correlated with silt (R = 0.881, P < 0.01, n = 42) and clay (R = 0.858, P < 0.01, n = 42) content. Consistent trends between fractions of coarse sand and a proxy index of relative aridity in sediment sequences from two palaeo-lakes further imply that climate drying reduced SOC through coarsening of the soil texture in the forest-steppe ecotone. Changes in carbon storage caused by climate drying can be divided into two stages: (1) carbon storage of the ecosystem was reduced to 68. 7%, mostly by soil coarsening when DBF were replaced by CF at ~5,900 ~(14)C years before present (BP); and (2) carbon storage was reduced to 26.4%, mostly by vegetation shifts when CF were replaced by ST at ~2,900 ~(14)C years BP.
机译：在预计的气候干燥条件下，森林-草原交错带的森林预计衰退将限制陆地生态系统的碳汇功能。先前的研究表明，内蒙古高原东南部的森林-草原过渡带最初是由全新世中期至晚期的气候干燥和植被转移引起的，但是改变土壤碳储量，植被和土壤转移的相关过程仍然不清楚。总共开挖了44种森林土壤剖面和40种草原土壤剖面，以确定该地区的落叶阔叶林（DBF），针叶林（CF）和草原（ST）的土壤碳储量。这些生态系统的碳密度估计为106. 51 t / hm〜2（DBF），73.20 t / hm〜2（CF）和28.14 t / hm〜2（ST）。土壤有机碳（SOC）含量与沙含量呈负相关（R = -0.879，P <0.01，n = 42），与淤泥（R = 0.881，P <0.01，n = 42）和黏土（R = 0.858，P <0.01，n = 42）含量。来自两个古湖的沉积物序列中的粗砂含量和相对干旱指数之间的一致趋势进一步表明，气候干燥通过森林草原过渡带土壤质地的粗化降低了SOC。气候干燥引起的碳储量变化可分为两个阶段：（1）生态系统的碳储量降低至68. 7％，主要是在约5,900〜（14）C年用CF代替DBF时土壤变粗在此之前（BP）; （2）碳储量减少至26.4％，主要是由于在约2,900〜（14）C年BP用CF替代了CF时的植被转移。

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