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Hierarchical responses of soil organic and inorganic carbon dynamics to soil acidification in a dryland agroecosystem,China

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Journal of Arid Land 2018年第5期10卷 726-736页

作者： JIN Shaofei TIAN Xiaohong WANG Hesong Department of Geography Ocean College Minjiang University Institute of Oceanography Minjiang University Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences College of Natural Resources and Environment Northwest A&F University College of Forestry Beijing Forestry University

soil acidification is a major global issue of sustainable development for ecosystems. The increasing soil acidity induced by excessive nitrogen （N） fertilization in farmlands has profoundly impacted the soil carbon dynamics. However, the way in which changes in soil pH regulating the soil carbon dynamics in a deep soil profile is still not well elucidated. In this study, through a 12-year field N fertilization experiment with three N fertilizer treatments （0, 120, and 240 kg N/（hm-2·a）） in a dryland agroecosystem of China, we explored the soil pH changes over a soil profile up to a depth of 200 cm and determined the responses of soil organic carbon （SOC） and soil inorganic carbon （SIC） to the changed soil pH. Using a generalized additive model, we identified the soil depth intervals with the most powerful statistical relationships between changes in soil pH and soil carbon dynamics. Hierarchical responses of SOC and SIC dynamics to soil acidification were found. The results indicate that the changes in soil pH explained the SOC dynamics well by using a non-linear relationship at the soil depth of 0-80 cm （P=0.006）, whereas the changes in soil pH were significantly linearly correlated with SIC dynamics at the 100-180 cm soil depth （P=0.015）. After a long-term N fertilization in the experimental field, the soil pH value decreased in all three N fertilizer treatments. Furthermore, the declines in soil pH in the deep soil layer （100-200 cm） were significantly greater （P=0.035） than those in the upper soil layer （0-80 cm）. These results indicate that soil acidification in the upper soil layer can transfer excess protons to the deep soil layer, and subsequently, the structural heterogeneous responses of SOC and SIC to soil acidification were identified because of different buffer capacities for the SOC and SIC. To better estimate the effects of soil acidification on soil carbon dynamics, we suggest that future investigations for soil acidification should be extended to a

关键词： soil acidification deep soil calcium carbonate generalized additive model (GAM) agroecosystem soilorganic carbon soil inorganic carbon

Distribution and storage of soil organic and inorganic carbon under different ecological zones in Xinjiang,China

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International Journal of Agricultural and Biological Engineering 2019年第1期12卷 116-125页

作者： An Yan Baoguo Li Feng Huang Wentai Zhang Ping'an Jiang Jiandong Sheng Xinjiang Key Laboratory of soil and Plant Ecological Processes College of Grassland and Environmental SciencesXinjiang Agricultural UniversityUrumqi 830052China College of Land Science and Technology China Agricultural UniversityBeijing 100193China College of Resource and Environment China Agricultural UniversityBeijing 100193China

The objective of this study was to quantify both soil organic carbon(SOC)and soil inorganic carbon(SIC)stocks in different ecological zones in Xinjiang Region,the largest arid and semi-arid region in northwest *** specific focus was on the vertical distributions of 641 typical soil profiles(0-100 cm).The study region covered five ecological zones:I-Altai/west Junggar;II-Junggar basin;III-Tianshan mountain;IV-Tarim basin;and V-Kunlun-Altun *** zones are categorized by their specific geographical locations from north to south with terrains derived from mountains to *** data used in the study were obtained from the first(1960s)and the second(1980s)National soil Surveys and partially from the field survey of this study conducted in *** results suggest that there are 11.74 Pg SOC and 26.71 Pg SIC total stocks in the 0-100 cm surface soil over the entire study *** distributions of SOC and SIC were found to be *** Tianshan mountain zone has the highest SOC stock,followed by the Tarim basin,Kunlun-Altun mountains,Altai and west Junggar(Altai/west Junggar),and Junggar basin *** contrast,the Tarim basin zone had the highest SIC stock,followed by the Tianshan mountain,Kunlun-Altun mountains,Junggar basin,and Altai/west Junggar *** SOC content decreases gradually from northwest to southeast and from mountains to deserts;while the SIC content decreases gradually from south to *** SOC and SIC contents also change with soil *** a given ecological zone,the SOC content increased with increasing soil depth,peaked at about 20-40 cm,then it decreased with the bigger depths below 40 *** SIC contents increased gradually from 0 to 40 cm,and then decreased gradually with increasing soil depth over the 40-100 cm depth in all ecological zones except for the Tianshan mountain area.

关键词： ecological zones soil organic carbon soil inorganic carbon carbon storage vertical distribution

Effects of afforestation on soil carbon and its fractions:a case study from the Loess Plateau,China

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Journal of Forestry Research 2018年第5期29卷 1291-1297页

作者： Yang Gao Peng Dang Zhong Zhao Key Laboratory of Environment and Ecology in Western China of Ministry of Education College of ForestryNorthwest A&F University

Afforestation has been implemented to reduce soil erosion and improve the environment of the Loess Plateau,*** it increased soil organic carbon（SOC）,the stability of the increase is ***,the variations of soil inorganic carbon（SIC） following afforestation needs to be *** planting Robinia pseudoacacia,Pinus tabuliformis,and Hippophae rhamnoides on bare land on the Loess Plateau,total soil carbon（TSC） was measured and its two components,SIC and SOC,as well as the light and heavy fractions within SOC under bare lands and woodlands at the soil surface（0–20 cm）.The results show that TSC on bare land was 24.5 Mg ha^（-1） and significantly increased to 51.6 Mg ha^（-1） for ***,47.0 Mg ha^（-1） for *** and 39.9 Mg ha^（-1） for *** accumulated total soil carbon under ***,***,and ***,the heavy fraction（HFSOC） accounted for 65.2,31.7 and 76.2%,respectively; the light fraction（LF-SOC） accounted for 18.0,52.0 and 4.0%,respectively; SIC occupied 15.6,15.3 and 19.7%,*** accumulation rates of TSC under ***,***,and *** reached159.5,112.4 and 102.5 g m^（-2） a^（-1）,*** results demonstrate that afforestation on bare land has high potential for soil carbon accumulation on the Loess *** the newly sequestrated total soil carbon,the heavy fraction（HF-SOC） with a slow turnover rate accounted for a considerably high percentage,suggesting that significant sequestrated carbon can be stored in soils following ***,afforestation induces SIC *** its contribution to TSC accumulation was less than SOC,overlooking it may substantially underestimate the capacity of carbon sequestration after afforestation on the Loess Plateau.

关键词： soil carbon sequestration soil organic carbon Organic carbon fractions soil inorganic carbon Afforestation

Distribution of soil carbon in different grassland types of the Qinghai-Tibetan Plateau

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Journal of Mountain Science 2016年第10期13卷 1806-1817页

作者： LIU Shu-li DU Yan-gong ZHANG Fa-wei LIN Li LI Yi-kang GUO Xiao-wei LI Qian CAO Guang-min Northwest Institute of Plateau Biology Chinese Academy of SciencesQinghai 810001China University of Chinese Academy of Sciences Beijing 100049China

Accurate estimate of soil carbon storage is essential to reveal the role of soil in global carbon cycle. However, there is large uncertainty on the estimation of soil organic carbon(SOC) storage in grassland among previous studies, and the study on soil inorganic carbon(SIC) is still lack. We surveyed 153 sites during plant peak growing season and estimated SOC and SIC for temperate desert, temperate steppe, alpine steppe, steppe meadow, alpine meadow and swamp, which covered main grassland in the Qinghai Plateau during 2011 to 2012. The results showed that the vertical and spatial distributions of SOC and SIC varied by grassland types. The SOC amount mainly decreased from southeast to northwest, whereas the SIC amount increased from southeast to northwest. The magnitude of SOC amount in the top 50 cm across grassland types ranked by: swamp > alpine meadow >steppe meadow > temperate steppe > alpine steppe > temperate desert, while the SIC amount showed an opposite order. There was a great deal of variation in proportion of SOC and SIC among different grassland types(from 55.17 to 94.59 for SOC and 5.14 to 44.83 for SIC). The total SOC and SIC storage was 5.78 Pg and 1.37 Pg, respectively, in the top 50 cm of soil in Qinghai Province. The mixed linear model revealed that grassland types was the predominant factor in spatial variations of SOC amount while grassland types and soil p H accounted for those of SIC amount. Our results suggested that the community shift of alpine meadow towards alpine grassland induced by climate warming would decrease carbon sequestration capacity by 6.0 kg C m2.

关键词： soil organic carbon soil inorganic carbon Different grassland types carbon distribution Storage

Moisture regime influence on soil carbon stock and carbon sequestration rates in semi-arid forests of the National Capital Region, India

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Journal of Forestry Research 2020年第6期31卷 2323-2332页

作者： Urvashi Tomar Ratul Baishya Department of Botany University of DelhiDelhi 110007India

Understanding the dynamics of soil carbon is crucial for assessing the soil carbon storage and predicting the potential of mitigating carbon dioxide from the atmosphere to the biomass and *** present study evaluated variations of soil carbon stock in semi-arid forests in India under diff erent moisture *** organic carbon(SOC)and soil inorganic carbon(SIC)stocks were determined in diff erent moisture regimes ***,post-monsoon,winter and pre-monsoon seasons at 0–10 and>10–20 cm *** stock showed signifi cant variations under different moisture *** highest SOC stock was during winter(22.81 Mg C ha−1)and lowest during the monsoon season(2.34 Mg C ha−1)among all the ridge forests under *** and SIC stock under diff erent moisture regimes showed signifi cant negative correlation with soil moisture(psoil moisture after rainfall results in an increase in carbon loss due to microbial decomposition of accumulated carbon during the dry *** was an increase in annual SOC stock and a decrease(or no change in some cases),in SIC stock at both the depths during the study *** SOC and SIC sequestration rates were estimated as any increase/decrease in the respective stock during each successive *** sequestered ranged between 0.046 and 0.741 Mg C ha−1 y−***,SIC sequestration ranged between 0.013 and 0.023 Mg C ha−1 y−1 over all ridge forests up to 20 cm *** Delhi ridge forests,which accounts to 0.007%of the semi-arid regions of India,contribute 0.25–0.32%of the national potential(semi-arid region)for SOC sequestration up to 20 cm *** estimates of the rate of C sequestration in this study provide a realistic image of carbon dynamics under present climatic conditions of semi-arid forests,and could be used in developing a database and formulating new strategies for carbon dioxide mitigation by enhancing soil C sequestration rates.

关键词： soil organic carbon soil inorganic carbon carbon sequestration Moisture regime Semi-arid forests

Climatic and Edaphic Controls on soil pH in Alpine Grasslands on the Tibetan Plateau,China:A Quantitative Analysis

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Pedosphere 2014年第1期24卷 39-44页

作者： JI Cheng-Jun YANG Yuan-He HAN Wen-Xuan HE Yan-Fang J.SMITH P.SMITH Department of Ecology and Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking University State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of Sciences College of Resources and Environmental Sciences China Agricultural University Institute of Biological & Environmental Sciences School of Biological SciencesUniversity of Aberdeen

soil acidity is an important parameter that can regulate ecosystem structure and ***,a quantitative understanding of the relationships between soil pH and environmental factors remains *** this study,relationships of soil pH with both climatic and edaphic factors in alpine grasslands on the Tibetan Plateau,China were quantified using data obtained from a regional soil survey during *** results showed that soil pH decreased along the gradient of both mean annual temperature and ***,soil pH exhibited consistent negative correlations with soil moisture and silt ***,soil organic and inorganic carbon contents played opposite roles in shaping patterns of soil pH:the accumulation of soil organic matter led to higher soil acidity,while the existence of soil inorganic matter was favorable for maintaining higher soil *** variation partitioning analysis indicated that the combination of climatic and edaphic variables explained 74.3%of the variation in soil *** results suggest that soil pH could be predicted from routinely-measured variables,allowing a robust pedotransfer function to be *** pedotransfer function may facilitate land surface models to generate more reliable predictions on ecosystem structure and function around the world.

关键词： climate soil acidity soil inorganic carbon soil organic carbon soil texture

Spatial Distribution and Temporal Dynamics of soil carbon Removal Caused by Water Erosion in China

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Journal of Resources and Ecology 2011年第3期2卷 210-216页

作者：高艳妮方华军于贵瑞王绍强中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室CERN综合研究中心北京100101 中国科学院研究生院北京100049

Using water erosion data from three national soil erosion remote-sensing surveys （the first：1985-1986; the second：1995-1996; the third： 2000-2001） and carbon density data from the second national soil survey （1979-1992）, we computed soil carbon removal caused by water erosion, and analyzed its spatial distribution and temporal dynamics in China. Results revealed that the total removal of soil carbon caused by water erosion was about 74.61 Tg C y^-1 , of which 51.49 Tg C y^-1 was organic carbon, and 23.12 Tg C y^-1 was inorganic carbon. The main erosion level of the whole is moderate erosion. Among the seven erosion regions, the Southwest Karst Region had the most significant removal of soil organic carbon, which was 26.48% of the total and mainly due to its moderate erosion. In contrast, about 67.62% of the soil inorganic carbon removal occurred in the Loess Plateau Region, which mainly due to its highly intense and intense erosion. As a whole, the removals of soil carbon caused by water erosion represented a decreasing trend among the three national soil erosion remote-sensing surveys. Between the first and the second survey, soil carbon removal decreased by 11.66 Tg C y^-1 , of which 81.93% was organic carbon. Compared with that in the second survey, soil carbon removal decreased by 1.65 Tg C y^-1 in the third survey, of which 1.514 Tg C y^-1 was organic carbon, and 0.134 Tg C y^-1 was inorganic carbon.

关键词： China water erosion soil organic carbon soil inorganic carbon soil erosion regions

Influencing factors and partitioning methods of carbonate contribution to CO_(2)emissions from calcareous soils

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soil Ecology Letters 2023年第1期5卷 6-20页

作者： Zhaoan Sun Fanqiao Meng Biao Zhu Key Laboratory of Biochemistry and Molecular Biology in University of Shandong College of Biological and Agricultural EngineeringWeifang UniversityWeifang 261061China Beijing Key Laboratory of Farmland soil Pollution Prevention and Remediation College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China

In calcareous soils,recent studies have shown that soil-derived CO_(2)originates from both soil organic carbon(SOC)decomposition and soil inorganic carbon(SIC)dissolution,a fact often ignored in earlier *** may lead to overestimation of the CO_(2)emissions from SOC *** calcareous soils,there is a chemical balance between precipitation and dissolution of CaCO_(3)-CO_(2)-HCO_(3),which is affected by soil environmental factors(moisture,temperature,pH and depth),root growth(rhizosphere effect)and agricultural measures(organic materials input,nitrogen fertilization and straw removal).In this paper,we first introduced the contribution of SIC dissolution to CO_(2)emissions from calcareous soils and their driving ***,we reviewed the methods to distinguish two CO_(2)sources released from calcareous soils and quantify the 13C fractionation coefficient between SIC and SIC-derived CO_(2)and between SOC and SOC-derived CO_(2),and to partition three CO_(2)sources released from soils with plants and organic materials ***,we proposed methods for accurately distinguishing three CO_(2)sources released from calcareous *** review helps to improve the accuracy of soil C balance assessment in calcareous soils,and also proposes the direction of further investigations on SIC-derived CO_(2)emissions responses to abiotic factors and agricultural measures.

关键词： rhizosphere effect soil organic carbon soil inorganic carbon three-source CO_(2)partitioning ^(13)C isotope

Effects of nitrogen addition on carbonate-derived CO_(2) emission after biochar addition

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soil Ecology Letters 2023年第4期5卷 39-49页

作者： Zhaoan Sun Tianxiang Hao Biao Zhu Key Laboratory of Biochemistry and Molecular Biology in University of Shandong College of Seed and Facility Agricultural EngineeringWeifang UniversityWeifang 261061China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China

●We studied the effect of nitrogen and biochar on CO_(2) emission from SOC and SIC.●Nitrogen increased SIC-derived CO_(2) by 41%but decreased SOC-derived CO_(2) by 20%.●Biochar reduced total soil-derived CO_(2) by neutralizing nitrogen-induced acidity.●We proposed a method for 3-or 4-source partitioning CO_(2) emission from calcareous *** addition generally increases the alkalinity regeneration to resist soil acidification driven by nitrogen(N)*** soils contain soil organic carbon(SOC)and inorganic C(SIC).Owing to technical limitations in three-source partitioning CO_(2),how biochar addition affects SOC-and SIC-derived CO_(2) emission has not been clarified ***,we conducted a 70-day incubation experiment of ammonium-N and maize-straw-derived biochar additions to investigate the N plus biochar impacts on SOC-and SIC-derived CO_(2) *** the 70-day incubation,we found that the N-only addition increased the SIC-derived CO_(2) emission by approximately 41%compared with the control,but decreased the SOC-derived CO_(2) emission by approximately 20%.This suggests that the distinct responses of SIC-and SOC-derived CO_(2) emission to N-only addition come from N-induced acidification and preferential substrate(N)utilization of soil microorganisms,*** with N-only addition,N plus biochar addition decreased the SIC-derived CO_(2) emission by 17%−20%during the first 20 days of incubation,but increased it by 54%during the next 50 *** result suggested that biochar addition reduced the SIC-derived CO_(2) emission likely due to the alkalization capacity of biochar exceeding the acidification capacity of ammonium-N in the short term,but it may increase the SIC-derived CO_(2) emission induced by the weak acidity produced from biochar mineralization in the long *** study is helpful to improve the quantification of CO_(2) emission from calcareous soils.

关键词： biochar soil organic carbon soil inorganic carbon three-source partitioning soil CO_(2)emission 13C isotope