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Variation of δ^(13)C in karst soil in Yaji Karst Experiment Site, Guilin

Chinese science Bulletin 2002年第6期47卷 500-503页

作者： pan genxing, he shiyi, CAO Jianhua,{2., nanjing agricultural university, nanjing 2.0095, china Karst Dyanmics Laboratory, Ministry of Land and resources, Guilin 541004, china College of resource and environment {2. Nanjing Agricultural University Nanjing China Karst Dyanmics Laboratory Ministry of Land and Resources Guilin China

This study deals with δ13C variation in karst soil system of Yaji Karst Experiment Site, Guilin, a typical region of humid subtropical karst formations. Samples of near ground air, plant tissue, soil and water (soil solution and karst spring) were respectively collected on site in different seasons during 1996-1999. Considerable variation of δ13C values are not only found with different carbon pools of soil organic carbon, soil air CO2.and soil water HCO3-, but also with the soil depths and with different seasons during a year. The δ13C values of CO2.both of near ground air and soil air are lower in July than those in April by 1‰-4‰ PDB. Our results indicate that the δ13C values of carbon in the water and air are essentially dependent on interface carbon interaction of air-plant-soil-rock-water governed by soilorganic carbon and soil CO2.in the system.

关键词： karst soil carbon δ13C.

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Green manure rotation and application increase rice yield and soil carbon in the Yangtze River valley of china

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Pedosphere 2023年第4期33卷 589-599页

作者： Qian YUE Jianfei sun Jonathan HILLIER Jing SheNG Zhi GUO Puping ZHU Kun CheNG genxing pan Yunpeng LI Xin WANG Key Laboratory for Crop and Animal Integrated Farming of Ministry of Agriculture and Rural Affairs/Institute of agricultural resources and {2. Jiangsu Academy of Agricultural SciencesNanjing 210014(China) nanjing Institute of environmental {2.s Ministry of Ecology and EnvironmentNanjing 210042(China) Global Academy of Agriculture and Food Security The Royal(Dick)School of Veterinary Studies and The Roslin InstituteThe University of EdinburghEaster Bush CampusMidlothian EH259RG(UK) Institute of resource Ecosystem and Environment of AgricultureNanjing Agricultural UniversityNanjing 210095(China)

The addition of organic matter via green manure rotation with rice is considered a smart agricultural practice to maintain soil productivity and support {2.al ***,few studies have quantitatively assessed the impact of green manure rotation and application on the interactions between agronomic management practice,soil fertility,and crop *** this study,800 pairs of data from 108 studies conducted in the agricultural region of the Yangtze River,china were assessed,and random forest(RF)modeling was performed to evaluate the effect of green manure rotation and application on rice yield and soil *** to a winter fallow system,rotation and application of green manure significantly increased rice yield and soil organic carbon(SOC)by 8.1%and 8.4%,*** to the RF models,rice type,green manure application rate and duration,mineral and organic nitrogen application rates,and initial SOC content and soil pH were identified as the main drivers for rice yield and SOC *** benefit analysis revealed that green manure application rates for early rice in double cropping system and the rice in single cropping system were approximately 2. and 2. t ha-1(fresh weight),***,the optimum green manure application rate was approximately 2. t ha-1(fresh weight)for carbon ***,it should be noted that green manure application to soils with high SOC level might result in the soils becoming a net carbon *** study contributed scientific and quantitative indicators for achieving the greatest benefits in rice yield and increasing SOC upon application of green manure.

关键词： carbon sequestration crop production random forest model soil fertility soil organic carbon

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