文献类型：期刊文献

中文题名：排水对若尔盖高原泥炭地土壤有机碳储量的影响

英文题名：Effects of drainage on soil organic carbon stock in the Zoige peatlands,eastern Qinghai-Tibetan Plateau

作者：周文昌[1,2] 索郎夺尔基[3] 崔丽娟[1,2] 王义飞[1,2] 李伟[1,2]

第一作者：周文昌

机构：[1]中国林业科学研究院湿地研究所;[2]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;[3]若尔盖湿地国家自然保护区管理局

年份：2016

卷号：36

期号：8

起止页码：2123-2132

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

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)

语种：中文

中文关键词：泥炭地;排水;土壤有机碳储量;若尔盖高原

外文关键词：peatlands; drainage; soil organic carbon stock; Zoige Plateau

分类号：S153

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。
Peatlands play a significant role in the global carbon cycle. They have been considered an important sink of carbon and account for 25%--43% global soil organic carbon stocks. Drainage has led to large losses of soil organic carbon in peatlands. However, few studies have investigated the impacts of drainage on soil organic carbon stocks in Zoige peatlands on the Qinghai-Tibetan Plateau. To reveal the spatial distribution characteristics of soil organic carbon stocks under different drainage regimes, and to provide more reliable soil organic carbon stock estimations, we surveyed the soil organic carbon stocks along a distance gradient from the ditches in Zoige peatlands. Soil bulk density and soil organic carbon stocks at different soil depths were investigated in two un-drained sites and three drained sites 130 m （D130）, 200 m （D200）, and 300 m （D300） away from the ditch. The soil organic carbon stocks ranged from 816.53--1030.88 tC/hm^2 in un-drained sites, with a mean of （923.71±107.18） tC/hm^2. The soil organic carbon stocks in un-drained sites were 8.1- fold higher than the China＇s average, and 9.4-fold higher than the global average. The mean soil organic carbon stocks in drained sites were （641.97±85.51） t C/hm^2 in site D130, （606.34±33.10） tC/hm^2 in site D200, and （473.72±43.81） tC/hm^2 in site D300, respectively. The mean soil organic carbon stocks of all drained sites was （574.01±66.86） tC/hm^2, which was 5.1-fold higher than the China＇s average, and 5.8-fold higher than the global average. The depth-averaged bulk density ranged from 0.28--0.73 g/cm^3 with a mean of （0.53±0.03） g/era3 in un-drained site 1, and 0.35--0.67 g/cm^3 with a mean of （0.46±0.09） g/cm^3 in un-drained site 2. The depth-averaged bulk density ranged from 0.56--0.78 g/cm^3, 0.46--0.77 g/cm^3, and 0.44--0.98 g/era3 at D130, D200, and D300, respectively. The bulk density of the top 30 cm, 50 cm, 100 cm soil layer, and the full-surveyed depth at the drained sites were 57.53%, 48.69%, 41.79%, and 31.58% higher than those of the corresponding depths in un-drained sites, respectively. Furthermore, the soil organic carbon stocks at the top 30 cm soil layer in the drained sites was markedly higher than that in un-drained sites （P 〈 0.01 ）. However, the soil organic carbon stocks at the full-surveyed depth in drained sites appeared significantly lower than that in un-drained sites （P 〈 0.01 ）. The different pattern of soil organic carbon stocks between the top 30 cm soil and full-surveyed depth in drained and un-drained sites might be due to the drawdown of the water table. The peat exposed to air could be promptly oxidized and decomposed in drained sites, where the soil porosity decreased and peat layer thinned. Thus, the soil bulk density and organic carbon stocks appeared to increase in the top soil layer, while soil organic carbon stocks of the whole soil profile decreased due to the thinned peat layer.