人工油松林不同生长阶段深层土壤有机碳和活性碳的差异及其影响因素

发布时间：2018-05-20 18:56

本文选题：活性有机碳 + 深层土壤　；参考：《自然资源学报》2016年08期

【摘要】：研究深层土壤碳库动态对了解陆地生态系统深层碳汇潜力、应对全球CO2升高具有重要意义。论文以黄土丘陵区人工油松林为研究对象,以撂荒地为参照,分析了不同生长阶段的人工油松林地0~200 cm土层土壤有机碳(soil organic carbon,SOC)和活性有机碳(readily oxidizable carbon,ROC)动态变化特征及其影响因素。结果表明:在0~200 cm剖面上,不同生长阶段油松林SOC含量及储量较撂荒地显著提高。浅层(0~100 cm)SOC平均含量,成熟林为撂荒地的2.03倍,提高最大;其次是中龄林,为1.85倍;最后是幼龄林,为1.59倍。深层(100~200 cm)SOC平均含量,幼龄林、中龄林和成熟林分别较撂荒地提高了1.43、1.38和1.36倍。各生长阶段油松林浅层和深层SOC储量分别占0~200 cm SOC储量的61.0%~69.8%和30.2%~39.0%,不同生长阶段间浅层SOC储量差异显著,但深层SOC储量差异不大。浅层ROC储量,幼龄林、中龄林和成熟林依次提高了54.8%、82.0%和91.6%;深层ROC储量依次提高了32.4%、40.9%和58.1%,且深层储量占0~200 cm土层的31.2%~33.3%。不仅浅层SOC和ROC含量受多个因素的影响,而且深层ROC含量也与油松高度、根系生物量以及枯落物厚度、干重呈极显著正相关。因此,人工林建设不仅显著提高浅层SOC和ROC含量,而且对深层土壤的固碳能力有一定改善。
[Abstract]:The study of deep soil carbon pool dynamics is of great significance to understand the potential of deep carbon sinks in terrestrial ecosystems and to increase global CO2. Taking artificial Pinus tabulaeformis forest in loess hilly region as research object and abandoned land as reference, the dynamic change characteristics and influencing factors of soil organic carbon (organic) and active organic carbon readily oxidizable carbon (organic) in 200cm soil layer at different growth stages were analyzed in this paper. The results showed that the SOC content and reserves of Pinus tabulaeformis forest in different growth stages were significantly higher than those in abandoned land on the 0 ~ 200cm profile of Pinus tabulaeformis. The average content of 100 cm)SOC was 2.03 times higher in the mature forest than in the abandoned land, followed by the middle age forest (1.85 times) and the young forest (1.59 times). The average content of 100 cm)SOC in deep layer was 1.43 ~ 1.38 and 1.36 times higher than that in abandoned land, respectively, in young, middle and mature forest. The SOC reserves in shallow and deep layers of Pinus tabulaeformis forest account for 69.8% and 39.0% of the 0 ~ 200cm SOC reserves, respectively. There are significant differences in SOC reserves between different growth stages, but there is no significant difference in SOC reserves in deep layers of Pinus tabulaeformis forest. The reserves of ROC in shallow layer, young forest, middle age forest and mature forest increased by 82.0% and 91.6% respectively, while that of deep layer increased by 32.4% and 58.1%, respectively, and the deep layer accounted for 31.2% and 33.33.3 of 0 ~ 200cm soil layer. Not only the SOC and ROC contents in shallow layer were affected by many factors, but also the content of ROC in the deep layer was positively correlated with the height of Pinus tabulaeformis, root biomass, litter thickness and dry weight. Therefore, plantation construction not only significantly increased the content of SOC and ROC in shallow layer, but also improved the carbon sequestration ability of deep soil.
【作者单位】：西北农林科技大学水土保持研究所;中国科学院水利部水土保持研究所;
【基金】：国家自然科学基金资助项目(41371508) 陕西省自然科学基础研究计划重点项目(2013JZ006) 西北农林科技大学基本科研业务费专项(ZD2013021)~~
【分类号】：S714.2

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