Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau.
Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau.
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DOI：
10.1371/journal.pone.0057024
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Scholten T
中科院分区：
文献类型：
--
作者：
Dörfer C;Kühn P;Baumann F;He JS;Scholten T
大约三分之二的总面积受到永久冻土层的影响。为了更好地了解多年冻土对土壤有机碳库和储量的作用，研究了连续冻土（五道梁）和断续冻土（华石峡）。采用密度分离与超声分散相结合的方法分离了三个有机碳组分：自由颗粒有机质（FPOM）和封闭颗粒有机质（OPOM）的轻组分（<1.6 g cm−3），以及矿物伴生有机质（MOM）的重组分（>1.6 g cm−3）。分析了各馏分中碳、氮及其有机碳的含量。FPOM的平均有机碳含量为252 g kg−1。有机碳含量最高的是OPOM (320 g kg−1)，最低的是MOM （29 g kg−1）。由于其较低的密度，易分解组分FPOM和OPOM分别占总SOC储量的27% （HUA）和22% （WUD）。HUA地区平均SOC储量（0-30 cm深度）为10.4 kg m - 2，而WUD地区为3.4 kg m - 2。在WUD中，53%的有机碳储存在上部10 cm，在HUA中只有39%。土壤含水量高的剖面POM值最高，达36%。在断续冻土中，有机碳储量与土壤水分和活动层厚度的相关性较强，而在连续冻土中，有机碳储量与活动层厚度的相关性不显著，土壤水分与有机碳储量的相关性较弱。因此，在不连续的永久冻土环境中，受永久冻土层影响的土壤容易受到土壤水分变化的影响，这是由于降水数量和季节分布的变化、温度的升高以及蒸发的变化。
The Tibetan Plateau reacts particularly sensitively to possible effects of climate change. Approximately two thirds of the total area is affected by permafrost. To get a better understanding of the role of permafrost on soil organic carbon pools and stocks, investigations were carried out including both discontinuous (site Huashixia, HUA) and continuous permafrost (site Wudaoliang, WUD). Three organic carbon fractions were isolated using density separation combined with ultrasonic dispersion: the light fractions (<1.6 g cm−3) of free particulate organic matter (FPOM) and occluded particulate organic matter (OPOM), plus a heavy fraction (>1.6 g cm−3) of mineral associated organic matter (MOM). The fractions were analyzed for C, N, and their portion of organic C. FPOM contained an average SOC content of 252 g kg−1. Higher SOC contents (320 g kg−1) were found in OPOM while MOM had the lowest SOC contents (29 g kg−1). Due to their lower density the easily decomposable fractions FPOM and OPOM contribute 27% (HUA) and 22% (WUD) to the total SOC stocks. In HUA mean SOC stocks (0–30 cm depth) account for 10.4 kg m−2, compared to 3.4 kg m−2 in WUD. 53% of the SOC is stored in the upper 10 cm in WUD, in HUA only 39%. Highest POM values of 36% occurred in profiles with high soil moisture content. SOC stocks, soil moisture and active layer thickness correlated strongly in discontinuous permafrost while no correlation between SOC stocks and active layer thickness and only a weak relation between soil moisture and SOC stocks could be found in continuous permafrost. Consequently, permafrost-affected soils in discontinuous permafrost environments are susceptible to soil moisture changes due to alterations in quantity and seasonal distribution of precipitation, increasing temperature and therefore evaporation.
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影响因子：
3
作者：
Gruenewald, Gritta;Kaiser, Klaus;Guggenberger, Georg
通讯作者：
Guggenberger, Georg
影响因子：
9.7
作者：
Kadono, Atsunobu;Funakawa, Shinya;Kosaki, Takashi
通讯作者：
Kosaki, Takashi
影响因子：
9.7
作者：
KIRSCHBAUM, MUF
通讯作者：
KIRSCHBAUM, MUF
影响因子：
3.7
作者：
Geng Y;Wang Y;Yang K;Wang S;Zeng H;Baumann F;Kuehn P;Scholten T;He JS
通讯作者：
He JS
成土作用、多年冻土和土壤湿度是青藏高原土壤氮和碳含量的控制因素
影响因子：
11.6
作者：
Baumann, Frank;He, Jin-Sheng;Scholten, Thomas
通讯作者：
Scholten, Thomas