论文部分内容阅读
采用碱石灰吸收法和HohenheimChamber法测定了德国南部农田CO2 释放规律 ,并对两种方法进行了比较。供试作物为冬小麦。在实验期间内 ,各处理的CO2 净释放量均为正值 ,表明在春季土壤 作物系统是碳的源。一天内作物 土壤系统在大部分时间内表现为CO2 净释放 ,只在中午 11:0 0至 13:0 0且光照充分时才出现净同化。不同轮作方式下农田CO2 累计释放量存在差异。不同处理CO2 累计释放量均为净释放 ,但处理间存在显著差别。CO2净释放量与气温、土壤温度极显著相关 ,与PAR相关性不明显。研究结果还表明 ,碱石灰吸收法吸收时间和吸收剂的数量都对试验结果有影响 ,而吸收时间的影响更为明显
The law of CO2 release from farmland in southern Germany was determined by the method of soda lime absorption and HohenheimChamber method. The two methods were compared. The test crop is winter wheat. During the experiment period, the net CO2 release of all treatments was positive, indicating that the soil crop system was the source of carbon in spring. The crop soil system showed net release of CO2 most of the time in one day and showed net assimilation only at 11: 00-13: 00 noon and sufficient illumination. There were differences in cumulative CO2 emission from farmland under different rotation patterns. The cumulative release of CO2 under different treatments was net release, but there was a significant difference between the treatments. The net CO2 release was significantly correlated with temperature and soil temperature, but not with PAR. The results also show that both the soda ash absorption method absorption time and the number of absorbent have an impact on the test results, but the impact of absorption time is more obvious