本文選題：活性有機碳 + 深層土壤　； 參考：《自然資源學(xué)報》2016年08期

【摘要】：研究深層土壤碳庫動態(tài)對了解陸地生態(tài)系統(tǒng)深層碳匯潛力、應(yīng)對全球CO2升高具有重要意義。論文以黃土丘陵區(qū)人工油松林為研究對象,以撂荒地為參照,分析了不同生長階段的人工油松林地0~200 cm土層土壤有機碳(soil organic carbon,SOC)和活性有機碳(readily oxidizable carbon,ROC)動態(tài)變化特征及其影響因素。結(jié)果表明:在0~200 cm剖面上,不同生長階段油松林SOC含量及儲量較撂荒地顯著提高。淺層(0~100 cm)SOC平均含量,成熟林為撂荒地的2.03倍,提高最大;其次是中齡林,為1.85倍;最后是幼齡林,為1.59倍。深層(100~200 cm)SOC平均含量,幼齡林、中齡林和成熟林分別較撂荒地提高了1.43、1.38和1.36倍。各生長階段油松林淺層和深層SOC儲量分別占0~200 cm SOC儲量的61.0%~69.8%和30.2%~39.0%,不同生長階段間淺層SOC儲量差異顯著,但深層SOC儲量差異不大。淺層ROC儲量,幼齡林、中齡林和成熟林依次提高了54.8%、82.0%和91.6%;深層ROC儲量依次提高了32.4%、40.9%和58.1%,且深層儲量占0~200 cm土層的31.2%~33.3%。不僅淺層SOC和ROC含量受多個因素的影響,而且深層ROC含量也與油松高度、根系生物量以及枯落物厚度、干重呈極顯著正相關(guān)。因此,人工林建設(shè)不僅顯著提高淺層SOC和ROC含量,而且對深層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.
【作者單位】： 西北農(nóng)林科技大學(xué)水土保持研究所;中國科學(xué)院水利部水土保持研究所;
【基金】：國家自然科學(xué)基金資助項目(41371508) 陜西省自然科學(xué)基礎(chǔ)研究計劃重點項目(2013JZ006) 西北農(nóng)林科技大學(xué)基本科研業(yè)務(wù)費專項(ZD2013021)~~
【分類號】：S714.2

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