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Shenyang Agricultural University (2018)

Simulation on the Future Change of Soil Organic Carbon under Different Tillage Managements and Carbon Sequestration Potential in the Northeast Dryland

张茂鑫;

Titre : Simulation on the Future Change of Soil Organic Carbon under Different Tillage Managements and Carbon Sequestration Potential in the Northeast Dryland

Auteur : 张茂鑫;

Grade : Doctoral Dissertation 2018

Université : Shenyang Agricultural University

Résumé partiel
Soil organic carbon(SOC)fixed problem become a hotspot research as the global CO2concentration rising in atmosphere and climate warming.Northeast China is one of the only three black earth belts in the world with rich soil quality.It is Chinese important grain production base.But the soil fertility is declining due to overreclamation.In the northeast soil carbon also show the source of state,whichhad a negative effect on the global carbon cycle.So research on SOC changes of the northeast upland and carbon sequestration ability in the future can accurately grasp the farmland fertility to ensure food security,also it plays an important strategic and realistic significance to sustainable agricultural development and to provide the theoretical foundation for optimization regional environment.The purpose is to understand the global carbon cycle to reduce greenhouse gas emissions and enhance soil carbon content.Based on 6 long-term observation experiment sites data,19 agriculture monitoring continuous observation data and 36 sites data from literature collection,the simulation capability of DAYCENT model on SOC in arid fields in northeast China was verified.Simulated the future changes of SOC for typical sites in black soil.Took the upland SOC(020cm)as the research object,the northeast dryland was gridded to 15km×15km,and2064 grids were extracted.DAYCENT model parameters were set,then simulated the futureSOC changes in different tillage managements.Also estimated the solid carbon potential in the northeast China.The results show that :(1)6 long-term observation experiment sites data were used to calibrate and verify the model simulation ability under NPK MNPK SNPK NT four treatments ;other 55 sites include19 agriculture monitoring continuous observation data and 36 sites from literature collection data are used to calibrate and verify the DAYCENT wide applicability in the northeast,and make sensitivity analysis on the model.The results show that validation evaluation parameter are in a reasonable range,simulation effect is good,explain DAYCENT model has broad applicability under different management situation in the northeast,the parameters of the model is reasonable.(2)4 types tillage management scenarios from 6 long-term observation sites were set in the future climate conditions to simulate SOC change in black soil district.The results showed that NPK has no significant effect,MNPK have certain effect with the low initial value.At the end of 2100,the SOC increase by 6.07%32.97%(except Helen).MNPK also can’t restrain the reduce trend of SOC for the high initial content ;SNPK and NT have positive effect on SOC promotion in black soil area.At the end of 2100,SOC will increase by 16.78%52.47%(except Helen)under NT SNPK treatments.SOC initial value in Helen site is higher,NT and SNPK can maintain soil fertility.(3)8scenariosin the future climate from 2010a to 2100a were set to simulate SOC changes under 2064 grids in the northeast dry land.SOC simulation effect is NT>INT>SNPK>ISNPK>MNPK>IMNPK>NPK>INPK.Among them NPK and INPK can not maintain the SOC content,the SOC of NT advantage is absolute,compared with the other scenario.The highest average of SOC in northeastis 24.8 g/kg in 2080 with NT scenario,compared with 1980a,increasing by 0.4%.In the region of southern and western in Liaoning province,and Liaohe Plain,includeFuxin,Chaoyang,Dalian and Shenyang,the SOC increased more than 60%under the optimal scenario with low initial value.The SOC still falls down more than 22%in the optimal scenario in Sanjiang plain and eastern mountainous district(include Baishan and Tonghua in Jilin Province,Hegang,Jixi and Shuangyashan in Heilongjiang Province)with higher initial SOC content

Mots clés : Northeast Dryland; Soil Organic Carbon; DAYCENT Model; Carbon Sequestration;

Présentation (CNKI)

Page publiée le 9 avril 2019