【摘要】 本文通过长期定位试验,分析了免耕、少耕和旋松三种耕作措施下耕层黑土土壤容积热容量、土壤热通量、净辐射的变化,进而阐明了耕作措施对耕层土壤温度日变化的影响。研究表明:各处理0cm和5cm处土壤温度变化与净辐射通量变化存在极显著相关关系。5cm处土壤热通量日变化各处理均表现为"S"型波动曲线,日变化相对较大,10cm处相对较小。免耕秸秆覆盖日净辐射平均值为0.58MJ/m2,比少耕和旋松小0.04MJ/m2,受净辐射、容积热容量和5cm处热通量影响,0cm和5cm处土壤温度日变化较大,且有波动现象;受深层较低地温、容积热容量和10cm处热通量影响,10cm和15cm处土壤温度变化较小,且较平稳。所有耕作措施土壤温度随深度的增加出现滞后现象。免耕秸秆覆盖措施各耕层相对于其他处理地温均较低,影响春季地温的升高。更多还原

【Abstract】 This study determined soil temperature of spring under different tillage systems by analyzing heat transferred in soil under a long-term experiment.Soil moisture,bulk density,radiation,and soil temperatures were measured at the same time,and then they could be used to calculate bulk heat capacity,net radiation flux,soil heat flux,which were contributed to analyze the changing of soil temperature in the whole day.The results showed that there were significantly relationship between net radiation and temperature at the depth of 0cm and 10cm at P=0.01 level.The daily soil heat flux changed as "S"curves at the depth of 5cm,and this kind of variation were bigger than the depth of 10cm.The net radiations of minimum tillage and rotary tillage were more 0.04 MJ/m2 than no tillage.Based on the effect of soil heat flux and the net radiation,the temperatures fluctuated at the depth of 0cm,5cm were stronger than 10cm and 15cm,and the heat in the topper layer transferred faster than deeper layer.Compared with upper layers,soil temperatures variation were lag in deeper layer.Top layers soil temperatures of no tillage were the lowest among all treatments,which impacted the seeds burgeon during spring,in black soil area,Northeast of China.更多还原