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Regional Differences and Characteristics of Soil organic carbon density Between Dry Land and Paddy Field in China

Agricultural Sciences in China 2007年第8期6卷 981-987页

作者： XU Quan RUI Wen-yi BIAN Xin-min ZHANG Wei-jian Institute of Applied Ecology Nanjing Agricultural University Nanjing 210095 P.R.China

Study on the regional characteristics of soil organic carbon （SOC） density in farmland will not only contribute greatly to the technique of soil productivity enhancement, but also give evidences of technique selection and policy making for carbon sequestration in soils. Based on the second national soil survey of China, the situation of SOC density in the plow layer of farmland was analyzed under different land use patterns. Results showed that SOC density in the plow layer was about 3.15 kg m^-2 in average ranging from 0.81 to 12.68 kg m^-2. The highest density was found in the southeastern region with an average of 3.63 kg ma, while the lowest occurring in the northwestern region with an average of 3.00 kg m^-2. The variation coefficient of SOC density in the plow layer of farmland was 57%, which was 35% lower than that of non-farmland soils. Compared to SOC density in the dry land, SOC density in paddy soils was 13% higher with a lower variation coefficient between different regions. In addition, the relationships between the climatic factors （annual average temperature and precipitation） and SOC density were lower in farmland than those in non-farmland soils, as well as lower in paddy soils than those in dry land of farmland. These results suggest that anthropogenic disturbances have great impacts on SOC density in farmland soils, especially in paddy soils, indicating that Chinese rice cropping may contribute greatly to the SOC stability and sequestration in paddy field.

关键词： land use pattern organic carbon density carbon sequestration regional difference global change

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Late Quaternary environmental changes and organic carbon density in the Hunshandake Sandy Land,eastern Inner Mongolia,China

Late Quaternary environmental changes and organic carbon den...

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中国科学院地质与地球物理研究所2008学术年会

作者： X.Yang~(a,*),B.Zhu~a,X.Wang~a,C.Li~b,Z.Zhou~a,J.Chen~c,X.Wang~d,J.Yin~c,Y Lu~c a Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China b Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China c Institute of Geology,Chinese Seismological Bureau,Beijing 100029,China d Institute of Earth Environment,Chinese Academy of Sciences,Xian 710075,China

Knowledge about changes of regional carbon density during late Quaternary is of great significance for understanding regional and global carbon cycles.Taking the Hunshandake Sandy Land,located in eastern Inner Mongolia of China as an example,this paper aims to reconstruct Late Quaternary environmental changes,and then to discuss the fluctuations of organic carbon density and storage in the desert environment of northern China.The study area with a mean annual precipitation ca.300 mm is characterized by the occurrence of fixed and semi-fixed sand dimes reaching a maximal height of 30 m.The research methods included field observations,examinations of grain sizes,as well as carbon and calcium carbonate contents of the sediment samples.The chronology is based on Optically Stimulated Luminescence(OSL) dating and radiocarbon analyses.This work reveals that the organic carbon density in the surface layer of the Hunshandake Sandy Land changed between at least 2500 g/m during the Holocene Climatic Optimum and 1500 g/m when aeolian processes dominate.The dune construction was restricted by periglacial processes during the Last Glacial Maximum(LGM).The Holocene Climatic Optimum,indicated by extensive formation of kastanozem soils,occurred between 5 ka and 3 ka in the study area.Although desertification might cause a 40%loss of total organic carbon storage within several dozen of years in the study area,a considerable amount of this carbon was re-deposited in the regions of downwind directions.

关键词： desert organic carbon density palaeoclimatology Late Quaternary China

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

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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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The Research of Forest Soil organic carbon Accumulation in Dabie Mountain

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Meteorological and Environmental Research 2011年第3期2卷 39-42页

作者： YANG Shu-yun,YANG Ke-feng,ZHANG Xin-tong,WANG Jun Anhui Agricultural University,Hefei 230036,China

In subtropical to warm temperate transitional zone of the Dabie Mountains hinterland forest topsoil as the research object this text,through the different levels of soil bulk density,organic carbon content of the determination of analytical studies in the area of forest surface soil organic carbon density.Because of the ecological role of small environment,the study area within the soil bulk density increased with depth,surface soil porosity,and bulk density from top to bottom in 0.8.All measuring points are the 0-10 cm surface layer soil organic carbon content are highest,content between 67.232-61.940 g/kg,this,because the forest soil organic carbon important source withers and falls in the vegetation stack and rotten.Different measuring point organic carbon along with depth change characteristic slightly different,low elevation the measuring point soil organic carbon content increases the monotonous drop along with the depth,the elevation is high,the measuring point slightly has in the 30-40 cm depth content increases.The comprehensive bulk specific gravity factor computation,the 0-40 cm soil organic carbon total content slightly has along with altitude above sea level’s rise increases,each square meter organic carbon content between 16 560.5-18 354.6 g,studies the region 0-40 cm soil organic carbon content mean value by 3 measuring points mean value achievement,then this region 0-40 cm soil organic carbon density approximately 174.3 t/hm2;Refers to the related research between the surface layer and the 0-100 cm soil layer organic carbon content relational reckoning,studies the region 0-100 cm soil organic carbon density to be possible to reach 233.9 t/hm2,it indicated that the Dabie Mountain area forest soil system has the giant organic carbon capacity.

关键词： Dabie Mountain area Forest soil organic carbon density China

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