施氮能够增加土壤中氮的有效性,提高植株光合作用,促进植株对氮的吸收和干物质的积累,最终增加作物产量。但是在长期高氮秸秆还田条件下,是否应调整施氮量尚不清楚。为探究长期秸秆还田条件下施氮量对棉花光合速率、干物质和养分积累分...施氮能够增加土壤中氮的有效性,提高植株光合作用,促进植株对氮的吸收和干物质的积累,最终增加作物产量。但是在长期高氮秸秆还田条件下,是否应调整施氮量尚不清楚。为探究长期秸秆还田条件下施氮量对棉花光合速率、干物质和养分积累分配、产量、氮素利用和土壤氮素变化的影响,本研究设置0(N0)、150(N150)、180(N180)、210(N210)、240(N240)、270(N270)和300(N300)kg hm^(–2)共7个施氮量处理。与常规施氮量(N300)相比,2020—2021年,减氮30%(N210)处理2年均获得了较高产量,分别为1853.62 kg hm^(–2)和1872.43 kg hm^(–2),减氮40%(N180)仅在第1年保持了较高产量,为1743.68 kg hm^(–2)。2021年,N210的净光合速率、干物质和养分积累量均高于N180,两者间生殖器官的干物质和养分分配系数、氮肥利用效率未有显著差异,但N180的土壤表观氮盈余量显著降低了39.15%。综上,长期秸秆还田条件下,鲁西北棉区应适量减少施氮量。展开更多
湿疹是一种反复性、多形性的过敏性皮肤病。该病病情较为顽固,严重影响生活质量。当前临床医学尚无法明确其具体发病机制,多使用抗组胺类药物进行对症治疗,但其远期疗效不佳,停药后容易复发。本文从中西医两个方面整理归纳了近年来火针...湿疹是一种反复性、多形性的过敏性皮肤病。该病病情较为顽固,严重影响生活质量。当前临床医学尚无法明确其具体发病机制,多使用抗组胺类药物进行对症治疗,但其远期疗效不佳,停药后容易复发。本文从中西医两个方面整理归纳了近年来火针治疗湿疹的相关文献,并对其病因病机作出阐释,证实了火针治疗湿疹有着显著的疗效,并且进一步分析火针治疗湿疹的优缺点,旨在为临床治疗该病提供依据。Eczema is a kind of repetitive, polymorphism of allergic skin diseases. The disease is more stubborn illness and seriously affects the quality of life. At present, the specific pathogenesis of the disease is still unclear in clinical medicine. Antihistamines are commonly used for symptomatic treatment, but their long-term efficacy is not good, and they are prone to relapse after drug withdrawal. This article summarizes the relevant literature of fire needling in the treatment of eczema in recent years from two aspects of traditional Chinese and western medicine, and interprets its etiology and pathogenesis. It has been confirmed that fire needling has significant effect on eczema, and further analyzes the advantages and disadvantages of fire needling in the treatment of eczema, aiming to provide a basis for clinical treatment of the disease.展开更多
文摘施氮能够增加土壤中氮的有效性,提高植株光合作用,促进植株对氮的吸收和干物质的积累,最终增加作物产量。但是在长期高氮秸秆还田条件下,是否应调整施氮量尚不清楚。为探究长期秸秆还田条件下施氮量对棉花光合速率、干物质和养分积累分配、产量、氮素利用和土壤氮素变化的影响,本研究设置0(N0)、150(N150)、180(N180)、210(N210)、240(N240)、270(N270)和300(N300)kg hm^(–2)共7个施氮量处理。与常规施氮量(N300)相比,2020—2021年,减氮30%(N210)处理2年均获得了较高产量,分别为1853.62 kg hm^(–2)和1872.43 kg hm^(–2),减氮40%(N180)仅在第1年保持了较高产量,为1743.68 kg hm^(–2)。2021年,N210的净光合速率、干物质和养分积累量均高于N180,两者间生殖器官的干物质和养分分配系数、氮肥利用效率未有显著差异,但N180的土壤表观氮盈余量显著降低了39.15%。综上,长期秸秆还田条件下,鲁西北棉区应适量减少施氮量。
文摘湿疹是一种反复性、多形性的过敏性皮肤病。该病病情较为顽固,严重影响生活质量。当前临床医学尚无法明确其具体发病机制,多使用抗组胺类药物进行对症治疗,但其远期疗效不佳,停药后容易复发。本文从中西医两个方面整理归纳了近年来火针治疗湿疹的相关文献,并对其病因病机作出阐释,证实了火针治疗湿疹有着显著的疗效,并且进一步分析火针治疗湿疹的优缺点,旨在为临床治疗该病提供依据。Eczema is a kind of repetitive, polymorphism of allergic skin diseases. The disease is more stubborn illness and seriously affects the quality of life. At present, the specific pathogenesis of the disease is still unclear in clinical medicine. Antihistamines are commonly used for symptomatic treatment, but their long-term efficacy is not good, and they are prone to relapse after drug withdrawal. This article summarizes the relevant literature of fire needling in the treatment of eczema in recent years from two aspects of traditional Chinese and western medicine, and interprets its etiology and pathogenesis. It has been confirmed that fire needling has significant effect on eczema, and further analyzes the advantages and disadvantages of fire needling in the treatment of eczema, aiming to provide a basis for clinical treatment of the disease.
