Effect Of Different Tillage Measures On Soil Carbon Storage, Moisture And Temperature

Conservation tillage can improve rainfall infiltration, reduce water loss, expand soil reservoircapacity, and increase organic matter, improve soil carbon sequestration potential. Conservation tillageis the solution to water resources inadequate and fertility decline of China’s northern arid regions.Foreign countries have been done a lot of systematic study, but the long-term impact of conservationtillage on soil needs observation in China’s northern arid regions. This experiment, located in northernChina semi-subhumid regions of Shanxi Shouyang, based on the long-term positioning of conservationtillage trials. The objectives of the present study were: to study soil thermal properties, spatial andtemporal variations of soil carbon pool and its influencing factors under ASRT and NTSM treatments,and systematic study soil thermal properties, soil carbon pool and influence mechanism.The main results were as follow:(1) NTSM with ASRT can effectively improve soil infiltrationcapacity, increase soil water storage and water retention. Conservation tillage significant reduces soilevaporation in the maize early growing, reduced by5%to35%, compared with the traditional farming.Conservation tillage significantly improves the soil moisture content in the growth period of maize. Soilwater storage were significantly higher than conventional tillage, NTSM and ASRT treatment,8-yearaverage soil water storage were400mm,445mm, respectively17%and11%higher than conventionaltillage. Water retention in the fall and winter under conservation tillage significantly alleviated thesecond year of the drought. The NTSM and ASRT treatment in seedling has a cooling effect, the averagetemperature of0.7℃~1.5℃lower than conventional tillage.(2) The NTSM and ASRT significantincrease soil organic carbon content. Soil microbial biomass carbon was significantly higher withNTSM and ASRT than with CT in the arable soil layer at different stages. NTSM treatment significantlyreduce soil respiration rate, decrease carbon emissions. NTSM and ASRT treatment significantlyincrease soil organic carbon storage,16.1t/hm~2(23%) and10.6t/hm~2(15%) higher than conventionaltillage.(3) Soil carbon storage and water storage has a significant positive correlation, ASRT and NTSMwere significantly increased soil water storage and carbon stocks, showing good water carbon couplingeffect. There is a significantly positive correlation between soil microbial biomass carbon and soilmoisture and soil temperature. In the different treatments, soil respiration was significantly correlatedwith temperature, increases gradually with the temperature rising, soil respiration rate and soil moisturehave a good inverted "U" shaped relationship.(4) Conservation tillage implements eight years haveyield instability in the implementation of the first five years, five years after the implementation ofno-tillage yield stability. ASRT has a good yield effect, six years higher than conventional farming.ASRT can effectively improve water use efficiency, better than NTSM treatment. Conservation tillagebehaves differently in different years, long-term study show that conservation tillage can improve wateruse efficiency.