Dataset Information

Soil organic carbon and total nitrogen pools in permafrost zones of the Qinghai-Tibetan Plateau.

ABSTRACT: There are several publications related to the soil organic carbon (SOC) on the Qinghai-Tibetan Plateau (QTP). However, most of these reports were from different parts of the plateau with various sampling depth. Here, we present the results from a systematic sampling and analysis of 200 soil pits. Most of the pits were deeper than 2?m from an east-west transect across the plateau. The SOC and total nitrogen (TN) pools of the 148?×?10⁴?km², the area of the permafrost zone, for the upper 2?m soils calculated from the vegetation map were estimated to be 17.07?Pg (interquartile range: 11.34-25.33?Pg) and 1.72?Pg (interquartile range: 1.08-2.06?Pg), respectively. We also predicted the distribution of land cover types in 2050 and 2070 using decision tree rules and climate scenarios, and then predicted SOC and TN pools of this region. The results suggested that the SOC and TN pools will decrease in the future. The results not only contribute to the carbon and nitrogen storage and stocks in the permafrost regions as a whole but most importantly, to our knowledge of the possible changes of C and N storage on the QTP in the future.

SUBMITTER: Zhao L

PROVIDER: S-EPMC5827726 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Publications

Soil organic carbon and total nitrogen pools in permafrost zones of the Qinghai-Tibetan Plateau.

Zhao Lin L Wu Xiaodong X Wang Zhiwei Z Sheng Yu Y Fang Hongbing H Zhao Yonghua Y Hu Guojie G Li Wangping W Pang Qiangqiang Q Shi Jianzong J Mo Bentian B Wang Qian Q Ruan Xirui X Li Xiaodong X Ding Yongjian Y

Scientific reports 20180226 1

There are several publications related to the soil organic carbon (SOC) on the Qinghai-Tibetan Plateau (QTP). However, most of these reports were from different parts of the plateau with various sampling depth. Here, we present the results from a systematic sampling and analysis of 200 soil pits. Most of the pits were deeper than 2 m from an east-west transect across the plateau. The SOC and total nitrogen (TN) pools of the 148 × 10<sup>4</sup> km<sup>2</sup>, the area of the permafrost zone, fo ...[more]

PMID: 29483565

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Project description:Global climate change has led to a significant increase in the frequency of extreme rainfall events in the Qinghai-Tibetan Plateau (QTP), thus potentially increasing the annual rainfall amounts and, consequently, affecting the net soil nitrogen (N) mineralization process. However, few studies on the responses of the soil net N mineralization rates to the increases in rainfall amounts and frequencies in alpine wet meadows have been carried out. Therefore, the present study aims to assess the effects of rainfall frequency and amount changes on the N fixation capacity of wet meadow soils by varying the rainfall frequency and amount in the Gahai wet meadow in the northeastern margin of the QTP during the plant-growing season in 2019. The treatment scenarios consisted of ambient rain (CK) and supplementary irrigation at a rate of 25 mm, with different irrigation frequencies, namely weekly (DF1), biweekly (DF2), every three weeks (DF3), and every four weeks (DF4). According to the obtained results, the increased rainfall frequency and amount decreased the soil mineral N stock and increased the aboveground vegetation biomass (AB) amounts and soil water contents in the wet meadows of the QTP. Ammonium (NH4+-N) and nitrate N (NO3--N) contributed similarly to the mineral N contents. However, the ammonification process played a major role in the soil mineralization process. The effects of increasing rainfall amount and frequency on N mineralization showed seasonal variations. The N mineralization rate showed a single-peaked curve with increasing soil temperature during the rapid vegetation growth phase, reaching the highest value in August. In addition, the N mineralization rates showed significant positive correlations with soil temperatures and NH4+-N contents and a significant negative correlation with AB (P < 0.05). The results of this study demonstrated the key role of low extreme rainfall event frequencies in increasing the net soil N mineralization rates in the vegetation growing season, which is detrimental to soil N accumulation, thereby affecting the effectiveness of soil N contents.

Dataset Information

Soil organic carbon and total nitrogen pools in permafrost zones of the Qinghai-Tibetan Plateau.

Publications

Soil organic carbon and total nitrogen pools in permafrost zones of the Qinghai-Tibetan Plateau.

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