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Northwest A&F University (2021)

Research on Carbon Sequestration and Emission Reduction and Yield Increased in Spring Maize Based on the Long-term Conservation Tillage on the Loess Plateau

张琦

Titre : Research on Carbon Sequestration and Emission Reduction and Yield Increased in Spring Maize Based on the Long-term Conservation Tillage on the Loess Plateau

Auteur : 张琦

Grade : Master 2021

Université : Northwest A&F University

Résumé partiel
Under the background of global warming,the sustainable soil carbon sequestration and the soil greenhouse gas emissions reduction in agricultural production can help to increase the contribution of agricultural production to environmental protection and promote the green and sustainable development of agriculture.In the Weibei dryland region,farmers adopted conventional tillage to absorb the limited rainfall to increase soil moisture.But the loose and bare soil structure formed by long-term conventional tillage will not benefit storage water.In addition,long-term tillage causes serious damage to soil structure,aggregates broken and the full contact between soil carbon and air accelerates the mineralization of soil carbon,which leads to the decline of soil productivity and accelerates the emission of CO2.The conservation tillage increased soil carbon sequestration but in long-term application will promote the soil carbon rich in surface layer and impact the vertical distribution character of soil carbon.Therefore,it is necessary to construct a reasonable and long-term applicable conservation rotational tillage system to overcome the disadvantages of single conservation tillage.A long-term site conservation tillage from2007 to 2020 about spring maize was conducted in Dry Farming Experiment Station,Northwest A&F University,Ganjin Town,Heyang County,Shaanxi Province,China.A single factor tillage random block design was adopted in the experiment with nine tillage practices:no-tillage/no-tillage/subsoiling(NNS),no-tillage/conventional-tillage/subsoiling(NCS),conventional tillage/conventional-tillage/subsoiling(CCS),no-tillage/subsoiling(NS),subsoiling/conventional tillage(SC),conventional tillage/no-tillage(CN),no-tillage(NT),subsoiling(ST)and conventional tillage(CT)was used as contrast.The soil physical properties,soil carbon pool properties,soil greenhouse emission,yield and water use efficiency were analysed to explore the effect of soil carbon sequestration,soil greenhouse emission reduction and yield increase,and got some results :

Mots clés : Conservation tillage ;Soil physicochemical property ;Soil carbon pool ;Soil greenhouse gas emissions ;Yield;

Présentation (CNKI)

Page publiée le 19 mars 2022