Global patterns of the dynamics of soil carbon and nitrogen stocks following afforestation: a meta-analysis
Global patterns of the dynamics of soil carbon and nitrogen stocks following afforestation: a meta-analysis
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DOI：
10.1111/j.1469-8137.2012.04150.x
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发表时间：
2012-07-01
期刊：
影响因子：
9.4
通讯作者：
Luo, Yiqi
中科院分区：
文献类型：
--
作者：
Li, Dejun;Niu, Shuli;Luo, Yiqi
植树造林已被认为是碳（C）固存的有效方法；然而，造林后土壤碳积累的大小和方向及其对土壤氮（N）动态的调节仍不清楚。我们综合了 292 个地点的结果，并进行了荟萃分析，以评估造林后土壤碳和氮储量的动态。土壤碳和氮储量的变化显着相关，并且具有相似的时间模式。造林后 30 年和 50 年，碳和氮储存量分别显着增加。在这些时间点之前，C 和 N 库存要么已耗尽，要么没有变化。在农田和牧场以及热带、亚热带和北方地区植树造林后，碳储量增加。亚热带地区土壤氮储量增加。桉树等硬木造林后土壤碳储量增加，但松树等软木造林后土壤碳储量没有变化。硬木（不包括桉树）和松树造林后，土壤氮储量分别增加和减少。这些结果表明，土壤碳和氮储量均随着造林后时间的推移而增加，并且通过造林固碳取决于先前的土地利用、气候和所种植的树种。
Afforestation has been proposed as an effective method of carbon (C) sequestration; however, the magnitude and direction of soil carbon accumulation following afforestation and its regulation by soil nitrogen (N) dynamics are still not well understood. We synthesized the results from 292 sites and carried out a meta-analysis to evaluate the dynamics of soil C and N stocks following afforestation. Changes in soil C and N stocks were significantly correlated and had a similar temporal pattern. Significant C and N stock increases were found 30 and 50 yr after afforestation, respectively. Before these time points, C and N stocks were either depleted or unchanged. Carbon stock increased following afforestation on cropland and pasture, and in tropical, subtropical and boreal zones. The soil N stock increased in the subtropical zone. The soil C stock increased after afforestation with hardwoods such as Eucalyptus, but did not change after afforestation with softwoods such as pine. Soil N stocks increased and decreased, respectively, after afforestation with hardwoods (excluding Eucalyptus) and pine. These results indicate that soil C and N stocks both increase with time after afforestation, and that C sequestration through afforestation depends on prior land use, climate and the tree species planted.