【摘要】 依托河北省农林科学院旱作农业研究所马铃薯节水试验平台,采用静态暗箱-气相色谱法,研究了在滴灌条件下不同灌溉水平W0（0 m³/ha）、W1（600 m³/ha）、W2（1 200 m³/ha）、W3（1 800 m³/ha）、W4（2 400 m³/ha）对马铃薯产量和土壤N₂O排放的影响。结果表明:增加灌溉水量能显著提高马铃薯产量和土壤N₂O累积排放量;W4处理获得最大马铃薯产量,约为31 765 kg/ha,W1、W3处理分别出现N₂O累积排放量最小值和最大值;W0对照处理N₂O排放通量与土壤湿度呈极显著相关,与土壤温度显著相关;灌溉量为W1时,N₂O排放通量与硝态氮含量显著相关,表明低灌溉处理时,土壤湿度、温度和硝态氮含量显著影响土壤N₂O排放,而高灌溉处理相关性不显著。综合分析马铃薯产量效益兼顾土壤N₂O减排,最优灌溉水平可取2 400 m³/ha。更多还原

【Abstract】 Relying on the potato water-saving test platform of Dry Farming Agriculture Research Institute of Hebei Academy of Agriculture and Forestry Sciences,static chamber-gas chromatography is used to study the effects of W0（0m3/ha）W1（600 m3/ha）W2（1200 m3/ha）W3（1 800 m3/ha）W4（2 400 m3/ha）on soil N₂O emission in potato fields under drip irrigation.The results show that irrigation water addition will significantly increase the potato yield and soil cumulative N₂O emission.The potato yield is the largest at irrigation level of W4（2 400 m³/ha）,which is about 31765kg/ha.The cumulative N₂O emission of W1and W3 treatments are the minimum and maximum respectively.N₂O emission flux with W0 treatment is extremely correlated with soil humidity and significantly correlated with soil temperature.In W1 situation,N₂O emission flux is significantly correlated with nitrate nitrogen content.That shows at low irrigation levels,the soil humidity,the soil temperature and the nitrate nitrogen content greatly affect the N₂O emission,while the high irrigation levels have less correlation.Therefore,the best irrigation level can be 2400 m³/ha,in which the maximum economic benefit can be obtained while the soil N₂O emission is lower.更多还原