排水对若尔盖高原泥炭地土壤有机碳储量的影响

发布时间：2018-01-18 10:17

本文关键词：排水对若尔盖高原泥炭地土壤有机碳储量的影响　出处：《生态学报》2016年08期 　论文类型：期刊论文

【摘要】：泥炭地作为陆地上生态系统一个重要碳汇,存储了全球土壤有机碳储量的25%—43%。泥炭地排水与其他土地利用导致了大量的土壤有机碳损失。然而,有关排水对中国泥炭地土壤有机碳储量的影响研究报道较少,因此,为了获得更多可靠的泥炭地碳储量信息,以便减少它们估算的不确定性。选取了我国若尔盖高原未排水泥炭地和排水泥炭地进行土壤剖面取样,定量评价排水对泥炭地土壤有机碳储量的影响。研究表明:(1)未排水泥炭地土壤有机碳储量平均值为(923.71±107.18)t C/hm~2,为中国陆地和全球陆地土壤有机碳储量的8.1和9.4倍;而排水泥炭地土壤有机碳储量平均值为(574.01±66.86)t C/hm~2,为中国和全球陆地的5.1和5.8倍。(2)泥炭地排水后,导致表层(0—30 cm)土壤有机碳储量增加(59.11±9.31)t C/hm~2,可能源于土壤容重增加。(3)然而,完全考虑泥炭剖面深度后,排水泥炭地土壤有机碳储量较对照样地减少了349.7 t C/hm~2,这可能是由于泥炭地排水后,水位降低,加速了泥炭氧化,降低了泥炭厚度。
[Abstract]:Peat lands, as an important carbon sink in terrestrial ecosystems, store 25 to 43 of the global soil organic carbon reserves. Peat drainage and other land use have resulted in a large loss of soil organic carbon. There are few reports on the effect of drainage on soil organic carbon storage in peat land in China, so in order to obtain more reliable information of carbon storage in peat land. In order to reduce the uncertainty of their estimation, the undrained peat land and drainage peat land in the Zoige Plateau of China were selected for soil profile sampling. The effects of drainage on soil organic carbon storage in peat land were quantitatively evaluated. The results showed that the average value of soil organic carbon storage in undrained peat land was 923.71 卤107.18 t C / hmm2. It is 8.1 and 9.4 times of China's terrestrial and global terrestrial soil organic carbon reserves. The average value of soil organic carbon storage in drained peat land was 574.01 卤66.86 t C / hm ~ (2), which was 5.1 and 5.8 times of that in China and the whole world. Soil organic carbon storage increased by 59.11 卤9.31 t C / hm ~ (2), probably due to the increase of soil bulk density. Considering the depth of peat profile completely, the soil organic carbon reserves in drained peat land decreased by 349.7 t / h ~ (-2) t / h ~ (-1), which may be due to the decrease of water level after peat drainage. The oxidation of peat is accelerated and the thickness of peat is reduced.
【作者单位】：中国林业科学研究院湿地研究所;中国林业科学研究院湿地研究所湿地生态功能与恢复北京市重点实验室;若尔盖湿地国家自然保护区管理局;
【基金】：国家林业公益性行业科研专项(201204201);国家林业公益性行业科研专项(201304315) 国家科技支撑项目(2011BAC02B03) 中国清洁发展机制基金赠款项目(2012076)
【分类号】：S153.6
【正文快照】： 泥炭地是指泥炭厚度至少为30 cm或有机质含量超过50%的湿地[1-2]。泥炭地面积占地球陆地表面积的3%,土壤存储了4.0×1017—6.0×1017g碳(C)[3-6],相当于全球陆地土壤0—100 cm有机碳储量(1.395×1018—1.576×1018g)的25%—43%[7-10]和大气中碳库(CO2-C)(7.96×1017g)的50%—7

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