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Effects of Rest Grazing on organic carbon storage in Stipa grandis Steppe in Inner Mongolia, China

Journal of Integrative Agriculture 2014年第3期13卷 624-634页

作者： LI Yu-jie ZHU Yan ZHAO Jian-ning LI Gang WANG Hui LAI Xin YANG Dian-lin Environmental Protection and Monitoring Institute Ministry of Agriculture Horticulture College Shenyang Agricultural University

This study was aimed to evaluate the potential effects of rest grazing on organic carbon storage in Stipa grandis steppe of Inner Mongolia, China. Using potassium dichromate heating method, we analyzed the organic carbon storage of plant and soil in Stipa grand＆ steppe after rest grazing for 3, 6, and 9 yr. The results indicated that as the rest grazing ages prolonged, the biomass of aboveground parts, litter and belowground plant parts （roots） of the plant communities all increased, meanwhile the C content of the biomass increased with the rest grazing ages prolonging. For RG0, RG3a, RG6a, and RG9a, C storage in aboveground vegetation were 60.7, 76.9, 82.8 and 122.2 g C m2, respectively; C storage of litter were 5.1, 5.8, 20.4 and 25.5 g C m^-2, respectively; C storage of belowground roots （0-100 cm） were 475.2, 663.0, 1 115.0 and 1 867.3 g C m^-2, respectively; C storage in 0-100 cm soil were 13.97, 15.76, 18.60 and 32.41 kg C m^-2, respectively. As the rest grazing ages prolonged, the organic C storage in plant communities and soil increased. The C storage ofbelowground roots and soil organic C was mainly concentrated in 0-40 cm soil body. The increased soil organic C for RG3a accounted for 89.8% of the increased carbon in vegetation-soil system, 87.2% for RG6a, and 92.6% for RG9a. From the perspective of C sequestration cost, total cost for RG3a, RG6,, and RG9a were 2 903.4, 5 806.8 and 8 710.2 CNY haq, respectively. The cost reduced with the extension of rest grazing ages, 0.15 CNY kg^-1 C for RG3a, 0.11 CNY kg-~ C for RG6a and 0.04 CNY kg℃ for RG9a. From the growth characteristics of grassland plants, the spring was one of the two avoided grazing periods, timely rest grazing could effectively restore and update grassland vegetation, and was beneficial to the sustainable use of grassland. organic C storage for RG9a was the highest, while the cost of C sequestration was the lowest. Therefore, spring rest grazing should be encouraged because it was proved to be a very efficient grassland use pattern.

关键词： rest grazing Stipa grandis steppe organic carbon density organic carbon storage carbon sequestration benefits

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Gulong shale oil enrichment mechanism and orderly distribution of conventional–unconventional oils in the Cretaceous Qingshankou Formation,Songliao Basin,NE China

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Petroleum Exploration and Development 2023年第5期50卷 1045-1059页

作者： ZHANG Shuichang ZHANG Bin WANG Xiaomei FENG Zihui HE Kun WANG Huajian FU Xiuli LIU Yuke YANG Chunlong PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China CNPC Key Laboratory of Petroleum Geochemistry Beijing 100083China National Key Laboratory for Multi-resource Collaborated Green Development of Continental Shale Oil Daqing 163712China PetroChina Daqing Oilfield Co. Ltd.Daqing 163712China

Through the study of organic matter enrichment,hydrocarbon generation and accumulation process of black shale of the Cretaceous Qingshankou Formation in the Songliao Basin,the enrichment mechanism of Gulong shale oil and the distribution of conventional–unconventional oil are revealed.The Songliao Basin is a huge interior lake basin formed in the Early Cretaceous under the control of the subduction and retreat of the western Pacific plate and the massive horizontal displacement of the Tanlu Fault Zone in Northeast China.During the deposition of the Qingshankou Formation,strong terrestrial hydrological cycle led to the lake level rise of the ancient Songliao Basin and the input of a large amount of nutrients,resulting in planktonic bacteria and algae flourish.Intermittent seawater intrusion events promoted the formation of salinization stratification and anoxic environment in the lake,which were beneficial to the enrichment of organic matters.Biomarkers analysis confirms that the biogenic organic matter of planktonic bacteria and algae modified by microorganisms plays an important role in the formation of high-quality source rocks with high oil generation capability.There are four favorable conditions for the enrichment of light shale oil in the Qingshankou Formation of the Gulong Sag,Songliao Basin:the moderate organic matter abundance and high oil potential provide sufficient material basis for oil enrichment;high degree of thermal evolution makes shale oil have high GOR and good mobility;low hydrocarbon expulsion efficiency leads to a high content of retained hydrocarbons in the source rock;and the confinement effect of intra-layer cement in the high maturity stage induces the efficient accumulation of light shale oil.The restoration of hydrocarbon accumulation process suggests that liquid hydrocarbons generated in the early(low–medium maturity)stage of the Qingshankou Formation source rocks accumulated in placanticline and slope after long-distance secondary migration,forming high-quality conventional and tigh

关键词： Songliao Basin Cretaceous Qingshankou Formation Gulong shale oil organic carbon storage orderly distribution of conventional-unconventional oil fault sealing whole petroleum system shale oil enrichment

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Research Status, Problems and Direction of Soil organic carbon in Zoige Peat Wetland

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生态学研究(英文) 2023年第3期5卷 1-10页

作者： Chanhua Ma Zhengqiang Xu Sichuan Institute of Nuclear Geology ChengduSichuan610052China

Peatlands,as a special type of wetland,occupy only 3%of the Earth’s surface,but bear about one-third of the world’s soil carbon storage and play an important role in the global carbon cycle.The Zoige Wetland is located on the eastern edge of the Qinghai-Tibet Plateau,and its peat reserves are up to 1.9 billion tons,accounting for more than 40%of the country’s peat resources,which is an important support for China to achieve the“double carbon”goal.This paper reviews the research status and storage estimation of soil organic carbon in Zoige Wetland.The statistical results show that there is a large difference in the estimation of carbon storage in the peatland of Zoige(0.43-1.42 Pg).The reasons are mainly related to marked differences in values reported for soil densities,organic carbon levels,and accumulation rates.There are still great uncertainties in the estimation of wetland carbon stocks,and future studies should focus on reducing soil carbon sink uncertainties,climate change,the impact of permafrost melting on carbon sink functions,the impact of degraded ecosystem restoration and sink enhancement pathways,and other greenhouse gas functions.In order to accurately reveal the current situation and future trend of carbon sink in peat wetlands,a model-multi-source observation data fusion system was constructed to complement the observation shortcomings in key areas,and provide reference and support for the construction of carbon neutral ecological civilization.

关键词： Zoige peat wetland Soil organic carbon organic carbon storage Climate change Greenhouse gases

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Effect of fertilizer on soil aggregate size distribution and soil organic carbon in water stable aggregate in China: a Meta analysis

Effect of fertilizer on soil aggregate size distribution and...

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2019年中国作物学会学术年会

作者：段雅欣禄兴丽 College of Agronomy Ningxia University

[Background] There has been an increased interest in the potentials of soil carbon(C) sequestration in agricultural fields with the increasing interests on climate change. The quantity and stabilization mechanisms of soil organic carbon(SOC) related to soil aggregates are influenced by fertilizer practices. A better understanding of soil carbon(C) distribution within aggregate fractions under different fertilizer types is essential for sustaining productivity and protecting the environment. [Material and Methods] A meta-analysis was conducted on 419 comparisons between fertilizer and no fertilizer(CK) treatments. [Results] The results showed that fertilizer treatment significantly(Porganic carbon content in aggregate at different magnitude in comparison with CK. The magnitude of increasing of soil organic carbon in macro-aggregate was higher in organic fertilizer than in inorganic fertilizer and organic combined with inorganic fertilizer treatments. Similarly, as compared with CK, organic fertilizer and organic combined with inorganic fertilizer treatments significantly(Porganic carbon content in micro-aggregate by 49.9% and 34.6%, respectively. organic combined with inorganic fertilizer also significantly increased organic carbon content in silt clay fraction by 46.8% when compared to CK treatment. Our results indicated that organic combined with inorganic fertilizer could significantly increased soil organic carbon at different magnitude in related to CK treatment. However, no difference in organic carbon from bulk soil was found between fertilizer and no fertilizer treatments. As compared with CK, organic fertilizer, inorganic fertilizer and organic combined with inorganic fertilizer significantly increased soil organic carbon storage by 41.3%, 23.8% and 34.2%, respectively. In contrast to earlier studies, averaged all comparisons, fertilizer di

关键词： Fertilizer management organic fertilizer soil aggregates distribution organic carbon storage Meta analysis

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