关键词: 生物炭, 水分运动, 硝态氮, 免耕, 地膜覆盖, 秸秆覆盖

Abstract: To understand the effect of climate change on the seed dispersal process by wind, the effects of climate change on the seed dispersal distance ofTaraxacum antungense, T.ohwianum,T. asiaticum, T.junpeianum,T.coreanum, and T.mongolicum in Fengcheng of LiaoningProvince, Changchun of Jilin Province and Muling County of Heilongjiang Province from May to October were monitored, based on climate change scenarios of RCP2.6, RCP4.5, RCP6.0 and RCP8.5 generated by the global climate model of NorESM1-M, and by using the seed winddispersal model of WINDISPER-L Lagrangian wind profile. The results showed that, under future climate change scenarios, air temperature would increase, the annual precipitation wouldincrease or decrease with obvious fluctuations, and wind speed would increase with obviousfluctuations in the three regions. The seed dispersal distances of those species by wind were about 1 m with high fluctuations from May to October in the period 2001-2050. Under different climate change scenarios, the seed dispersal distance of these dandelion species would decrease compared with that under baseline scenarios in most years from 2001 to 2050, whereas it wouldincrease in some exceptional years. The results suggest that the seed dispersal distance of these dandelion species would decrease, and such changes would be dependent on plant species identity, time, and location.

Key words: NO₃^--N, soil water movement, straw mulching, no-tillage, biochar, plastic film mulching