土壤水分和植株密度互作对紫花苜蓿植株性状和叶片特征的影响

适宜的土壤含水量和植株密度是栽培草地管理的关键因子.本研究采用盆栽试验分析了不同土壤水分(85％～90％、75％～80％、60％～65％、35％～40％的土壤饱和含水量)和植株密度(10、15、20株·盆?1)互作对紫花苜蓿(Medicago sativa)植株性状和叶片特征的影响.结果表明,紫花苜蓿株高、分枝数、根颈...

Effects of soil water and plant density interaction on plant and leaf characteristics of alfalfa

Suitable soil water content and plant density are key factors in the management of cultivated grassland. In this study, pot experiments were used to analyze the effects of different soil moisture (85%～90%, 75%～80%, 60%～65%, 35%～40% saturated soil moisture) and plant density (10, 15, 20 plants per pot) on plant and leaf characteristics of alfalfa (Medicago sativa). The results showed that the plant height, branch number, root neck diameter, main root length, and chlorophyll content of alfalfa increased first and then decreased with the increase of soil water content, while the leaf area and leaf dry weight showed an increasing trend. The root neck diameter, main root diameter, leaf area and leaf dry weight of alfalfa decreased with the increase of plant density, while chlorophyll a and chlorophyll b increased first and then decreased. Soil moisture and plant density interactions significantly affected only the root collar diameter (P < 0.05), and optimization results found that plant density was 15.1 plants per pot, and soil water content for soil saturated water capacity was 75.6% when root collar diameter was at its maximum, about 2.21 mm. This provides a scientific basis for regulating soil moisture and plant density in the field management of alfalfa.