| Through Rapeseed Deyou No.6 field experiment, this paper studied the effect of different tillage practices(no-till, rotary tillage) and fertilization measures (single chemical fertilizer, chemical fertilizer and organic fertilizer) to live in winter rapeseed growth, dry matter accumulation and yield formation, plants and the effects of soil organic carbon and soil respiration rate, in order to analysis and estimate Sichuan Chengdu plain region growing season of rape crop-soil carbon sequestration potential of the system and provide a scientific basis for farmland soil respiration emissions of CO2 condition. The results showed that:1. In terms of live rape growth and yield, no-till way compares with the rotary tillage,no-till way can increase the rape plant height, leaf number, leaf area index and pod number per. But in terms of accumulation of dry matter under different farming methods, yield and its components are no significant difference. Compared with no fertilizer processing, fertilizer can obviously increase the plant height of rapeseed, leaf number, leaf area index, dry matter accumulation, yield and its components, even the integrated effect of F3 processing is best, but the difference among the F1, F2 and F3 is not significant.2. Rape aboveground plant organic carbon accumulates with development process, changing in the "S" type curve. Sowing from 97 days to 156 days was the stage of plant organic carbon accumulation quickly. In the seedling and flowering plant organs stage, the organic carbon content of no-till is significantly higher than that of rotary tillage treatment.In the stage of mature, it’s lower than the rotary tillage treatment, but the difference was not significant. Fertilization can significantly increase the organic carbon content of different organs, F2 and F3 to increase the size was greater than F1. The farming methods to live canola plants has no obvious effect on the accumulation of organic carbon. Fertilization significantly promoted the accumulation of organic carbon, but the difference among F1, F2 and F3 processing plant organic carbon accumulation was not significant. In the processing of no-till, NTF3 processing plant carbon fixed quantity was the biggest, about 6964.41 kg/hm2. While on the treatment of rotary tillage, CTF1 processing plant carbon fixed quantity is the largest,about 6804.12 kg/hm2.3. In the growing season, compared with the rotary tillage, no-tillage way is beneficial to the increase the content of soil organic carbon,and it has significant difference in flowering period and pod development period. Fertilization can also significantly increase the content of soil organic carbon. Except the seedling CTF1 processing on the low side, in the main growth period, soil organic carbon content among F1,F2 and F3 has no significant difference. Till the period of mature,in the way of the no-till, NTF3 processing of soil organic carbon content is the largest, about 24.22 g/kg. While in the way of the rotary tillage, CTF1 processing of soil organic carbon content is the largest, about 21.36 g/kg.4. In rapeseed seedling stage, pod development period and mature period, rotary tillage of the soil microbial carbon content is higher than that of no-till way, while in flowering period, lest tillage methods are relatively higher, but the main period of the differences between farming has not reached the significant level. Fertilizing soil microbial carbon content were higher than no fertilizer treatment, and soil microbial carbon content in F2 processing is the largest in every period. But in addition to the flowering period F2 treatment was significantly higher, in other times soil microbial carbon content among Fl, F2 and F3 soil had no significant difference.5. In the growing season, the processing of the dynamic change of soil respiration rate is relatively obvious, the lowest in early January, the largest peak in the middle of March. On the whole, first it’s down slowly, then rapidly increasing, then decreasing in the percentage of the trend. The average soil respiration rate of the whole growth period is 1.91 umolCO2/(m2. s),1.62 umolCO2/(m2. s) in winter,2.19 umolCO2/(m2. s) in spring. Compared with the soil respiration rate of rotary tillage way, the No-till way is lower. In winter, spring and the whole growth period, respectively, compared with the rotary tillage method was reduced by 5.7%,6.6% and 6.5%.Fertilization is significantly promoting the soil respiration rate of every period. And the F2 and F3 processing (fertilizer and organic fertilizer) of soil respiration rate greater than F1 processing (single fertilizers), with the highest soil respiration rate of F3 processing. In the growing season,the amount of soil respiration to release various treatments were 3527.09 kg/hm2 to 4229.90 kg/hm2. Among them, the amount of total soil respiration in the rotary tillage way is higher than that in no-till way. Fertilization increases the total soil respiration, and the total soil respiration in the F2 and F3 processing (fertilizer and organic fertilizer) is higher than that in F1 processing (fertilizer).6. Analysis showed that soil temperature and humidity have great effects on soil respiration rate. Soil respiration rate and temperature is on exponential equation, and the soil respiration rate and soil moisture is a linear relationship. The correlation coefficient was 0.6654 and 0.6654,and had the significant positive correlation. Soil respiration rate and biomass, plant carbon accumulation, soil organic carbon content and soil microbial carbon content are positively correlated.Above all, farming (no-till, rotary tillage) and fertilizer processing (F1, F2 and F3) had no significant effects on rapeseed yield and the accumulation of organic carbon; No-till way is helpful to increase soil organic carbon content but the soil respiration rate is relatively low. The soil organic carbon content is also no significant difference among F1, F2 and F3 processing, but the soil respiration rate in the F3 processing is greater than that in the F2 processing which is greater than that in the F1 processing.Therefore,on this experimental condition, live rape can use no-till methods and F2 treatment (chemical fertilizer and organic manure fertilizers), in order to obtain high yield, plant and soil organic carbon accumulation and lower soil respiration. |
