明党参、峨参光合与生长的研究

明党参和峨参具相似的光合特征：3月的光合速率、光饱和点及光补偿点均大于1月；光合强度接近；对冬季至早春的光利用能力较强，而对春夏的强光都不能充分利用．明党参的比叶面积(SLA)、叶面积比(LAR)、叶生物量比(LMR)均低于峨参，光合持续时间比峨参短160d左右．两种植物的株高、冠幅、最大带柄叶长和叶片数均在早春的3、4月份迅速增大，进行旺盛营养生长，明党参的4个生长指标均低于峨参，明党参总光舍量远低于峨参，物质积累及生长较峨参缓慢，生殖投入低，生活史长，种群受到干扰后不易迅速恢复，

Studies on photosynthesis and growth of Changium smyrnioides and Anthriscus sylvestris

Changium smyrnioides and Anthriscus sylvestris have similar photosynthetic characters: their net photosynthetic rates, light saturation points and light compensation points in March are greater than in January; photosynthetic intensity of these two species is similar; and they can use the light resource both in winter and in early spring effectively but cannot take full advantage of light after spring. The specific leaf ration(SLA), leaf area ratio(LAR) and leaf mass ratio(LMR) of C.smyrnioides are lower than those of A.sylvestris, and the photosynthetic lasting time of C. smyrnioides is about 160 days shorter than that of A. sylvestris . Height, crown amplitude, length of main leaf and leaf number of both species grow speedily in March and April in early spring with nutritional organ flourishing, these four vegetal parameters of Changium smyrnioides are all lower than that of A. sylvestris . All these cause the total photosynthesis production of C. smyrnioidees very much lower than that of A. sylvestris, and accordingly result in lower biomass accumulation, lower growth rate, lower reproductive input and longer life history, suggesting that the population of C. smyrnioides cannot recover easily in short time in case it is disturbed.