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以不同蔬菜前茬处理的冬小麦田为对象,研究土壤呼吸变化特征、各影响因子对土壤呼吸的响应的通径分析以及计算全生长季农田碳汇强度.结果表明:①温度对土壤呼吸速率的响应随深度增加具有滞后性;土壤呼吸与土壤水分呈显著二次相关.②有效磷、速效钾、土壤脲酶、土壤温度、土壤水分对土壤呼吸变化的贡献较大,为主要影响因子.5种主要因子中土壤温度对土壤呼吸的作用最强,速效钾的作用最弱.③4种不同前茬处理的冬小麦田平均碳排放速率为:辣椒茬>芹菜茬>玉米茬>茄子茬.而碳“汇”强度表现:茄子茬>芹菜茬>玉米茬>辣椒茬.就本研究而言,虽然辣椒茬的冬小麦田平均土壤呼吸速率较大,但其农田碳固定量也较大,净初级生产力(NPP)与土壤碳释放量(Rs)的比值NPP/Rs最大,表现为碳“汇”强度也最大,按照增“汇”减排的宗旨安排轮作种植,辣椒茬是比较适宜的前茬,其次是玉米茬、芹菜茬、茄子茬.
The characteristics of soil respiration, the path analysis of each factor’s response to soil respiration, and the calculation of the carbon sequestration intensity in the field during the whole growing season were studied in winter wheat fields with different vegetable precultured.The results showed that: ①The effect of temperature on soil respiration rate The response has a hysteresis with the increase of depth, and soil respiration has a significant quadratic correlation with soil moisture.②The contribution of available phosphorus, available potassium, soil urease, soil temperature and soil moisture to soil respiration is larger, which is the main influencing factor.5 species The effect of soil temperature on soil respiration was the strongest in the main factors, but the effect of available potassium was the weakest.③The average carbon emission rate of winter wheat with four different treatments was: peppery> celery> corn> eggplant, “Hui” intensity performance: Eggplant stubble> Celery stubble> Corn stubble> Pepper stubble. Although the average soil respiration rate of winter wheat field with pepper stubble is larger in this study, its carbon fixation amount in farmland is also larger, net primary The NPP / Rs ratio of productivity (NPP) to soil carbon emission (Rs) was the largest, showing the highest intensity of carbon and sinks, and planting rotation according to the objective of reducing emissions by increasing Suitable before , Followed by corn stubble, stubble celery, eggplant crop.