【摘要】 种植密度是影响马铃薯块茎生长发育的主要因素之一。主栽品种 Mira 和783-1各3种密度的试验结果表明,随着单位面积播种密度的增加,单位面积上的主茎数及块茎数目均增加,而块茎的平均重量及大中薯率则减少。单位面积上的光能截获量与植株干重、块茎干重和块茎的平均重量均呈极显著的直线相关。Mira 和783-1的光能转化系数分别为1.444克干重/兆焦和1.106克干重/兆焦。分配到块茎的干物质比率随着块茎的生长而增加,最终两品种的干物质转化率均为85%左右。而密度对各品种的光能转化率及块茎干重分配率均无显著影响。因此,种植密度主要是通过对单位面积上块茎数量的控制来影响块茎所获得的屯合产物的数量及块茎的生长发育。更多还原

【Abstract】 Plant density is one of the main factors which influences tuber growth ofpotatoes.Main crop varieties Mira and 783-1 with 3 plant density treatmentswere used in the experiment and the results showed that the numbers of mainstems and tubers increased as the number of plants per unit area increased.There were linear relationships between intercepted radiation and plant dryweight,tuber dry weight and mean tuber weight.The conversion coefficients ofradiation of Mira and 783-1 were 1.444g and 1.106 g dry matter MJ^-1,respectively.The percentage of dry matter distributed to the tubers increased with their growth.The ulfimate conversion efficiency of dry matter of the two varieties wasabout 85%.There were no significant effects of plant density on the conversioncoefficient of radiation and dry matter distribution within plants.Therefore,theamount of photoassimilates obtained by tubers,hence the tuber growth wasaffected by plant density mainly through controlling the number of tubersproduced per unit area.更多还原