关键词: 枸杞, 黄灌区, 腐植酸, 光合作用, 糖代谢, 产量

Abstract: Lycium barbarum L. is an important medicinal plant resource. Unreasonable fertilizing measures can lead to decline of wolfberry quality, and cause environmental pollution and other problems. In order to determine the suitable fertilizing methods for Lycium barbarum L. growth in the Yellow River irrigation area, this paper set out 3 different fertilizing measures (T1: no dressing; T2: topdressing by 40 kg/hm2 of urea; T3: topdressing by 10 kg/hm2 of humic acid) to analyze photosynthesis and sugar contents of wolfberry leaf, and its yield and quality. The results showed that T3 treatment could significantly increase the net photosynthetic rate (Pn), stomatal conductance (Gs), and decrease the intercellular CO2 concentration (Ci). Moreover, T3 treatment could significantly increase the leaf stomatal limitation value (Ls) and water utilization efficiency (WUE) in the harvest period. Compared with those under T1 treatment, their changing rates were 42.1% and 67.2%, respectively. The glucose, fructose and polysaccharide contents of the matured Chinese wolfberry fruits were following the order of T3>T2>T1 during the growing period. But sucrose content showed an opposite trend. Obviously topdressing had improved the commercial yield and medicinal qualities of Lycium barbarum L., and T3 treatment had better controlling and regulation effect. Application of humic acids in this area could significantly enhance the leaf photosynthesis role of Lycium barbarum L. and improve the fruit yield and quality of one-season Lycium barbarum L..

Key words: Lycium barbarum L., the Yellow River irrigation area, humus acid, photosynthetic role, saccharometabolism, yield