Plastic film mulch in agricultural production becomes essential to maintaining crop yields in arid and semiarid areas.However,the presence of residual film in farmland soil has also drawn much attention.In this study,...Plastic film mulch in agricultural production becomes essential to maintaining crop yields in arid and semiarid areas.However,the presence of residual film in farmland soil has also drawn much attention.In this study,three experiments were conducted.The first two experimental designs included 0,450,1350,and 2700 kg ha^(-1) of residual film pieces of approximately 5 cm side length added to field soil(0-20 cm soil depth)for seven years and added to pots for four years.In the third experiment,1350 kg ha^(-1)of the residual film with different side lengths(2-5,5-10,10-15,and 15-20 cm)was added to field soil for six years to explore the effect of residual film fragment size on soil nutrients,soil microorganisms,crop growth and yields.The residual film had little effect on the soil moisture at a field depth of 0-2(or 0-1.8)m.There were no significant effects on organic carbon,total nitrogen,inorganic nitrogen,total phosphorus or available phosphorus in the 0-20 cm soil layer.The presence of residual film decreased the richness and diversity of the bacterial community of the surface soil of the residual film,but it had no significant effect on the microbial community of the non-surface soil.The emergence rates of wheat and lentils occasionally decreased significantly with different amounts of residue fragments added to the field.At 450-2700 kg ha^(-1),the residual film reduced the plant height and stem diameter of maize and significantly reduced the shoot biomass of harvested maize by 11-19%.The average yields of maize and potato over the seven years decreased,but there were almost no significant statistical differences among the treatments.These results provide important data for a comprehensive scientific understanding of the effects of residual film on soil and crops in dryland farming systems.展开更多
B型胰岛素抵抗(type B insulin resistance,TBIR)是一种机体自身免疫紊乱使体内产生胰岛素受体抗体(AIRAs)的临床综合征[1],常见于中年女性,典型的临床表现是糖代谢紊乱(顽固高血糖或致死性低血糖),常合并自身免疫性疾病[2],有或无高胰...B型胰岛素抵抗(type B insulin resistance,TBIR)是一种机体自身免疫紊乱使体内产生胰岛素受体抗体(AIRAs)的临床综合征[1],常见于中年女性,典型的临床表现是糖代谢紊乱(顽固高血糖或致死性低血糖),常合并自身免疫性疾病[2],有或无高胰岛素血症(黑棘皮症)和高雄激素血症。对该病的治疗还处于经验治疗阶段,在药物种类、剂量、单一或联合等的选择上并无标准[3]。该病罕见,典型临床表现又并非同时出现极易造成漏诊和误诊。本文将报道1例通过诊断性治疗确诊的TBIR病例。展开更多
基金funded by the National Natural Science Foundation of China (31470496)the Fundamental Research Funds for the Central Universities, China (lzujbky-2021-sp42)the ‘111’ Programme 2.0, China (BP0719040)。
文摘Plastic film mulch in agricultural production becomes essential to maintaining crop yields in arid and semiarid areas.However,the presence of residual film in farmland soil has also drawn much attention.In this study,three experiments were conducted.The first two experimental designs included 0,450,1350,and 2700 kg ha^(-1) of residual film pieces of approximately 5 cm side length added to field soil(0-20 cm soil depth)for seven years and added to pots for four years.In the third experiment,1350 kg ha^(-1)of the residual film with different side lengths(2-5,5-10,10-15,and 15-20 cm)was added to field soil for six years to explore the effect of residual film fragment size on soil nutrients,soil microorganisms,crop growth and yields.The residual film had little effect on the soil moisture at a field depth of 0-2(or 0-1.8)m.There were no significant effects on organic carbon,total nitrogen,inorganic nitrogen,total phosphorus or available phosphorus in the 0-20 cm soil layer.The presence of residual film decreased the richness and diversity of the bacterial community of the surface soil of the residual film,but it had no significant effect on the microbial community of the non-surface soil.The emergence rates of wheat and lentils occasionally decreased significantly with different amounts of residue fragments added to the field.At 450-2700 kg ha^(-1),the residual film reduced the plant height and stem diameter of maize and significantly reduced the shoot biomass of harvested maize by 11-19%.The average yields of maize and potato over the seven years decreased,but there were almost no significant statistical differences among the treatments.These results provide important data for a comprehensive scientific understanding of the effects of residual film on soil and crops in dryland farming systems.
文摘B型胰岛素抵抗(type B insulin resistance,TBIR)是一种机体自身免疫紊乱使体内产生胰岛素受体抗体(AIRAs)的临床综合征[1],常见于中年女性,典型的临床表现是糖代谢紊乱(顽固高血糖或致死性低血糖),常合并自身免疫性疾病[2],有或无高胰岛素血症(黑棘皮症)和高雄激素血症。对该病的治疗还处于经验治疗阶段,在药物种类、剂量、单一或联合等的选择上并无标准[3]。该病罕见,典型临床表现又并非同时出现极易造成漏诊和误诊。本文将报道1例通过诊断性治疗确诊的TBIR病例。
