以祁连山南坡东段典型天然祁连圆柏为研究对象,采用Li-6800便携式光合测定系统测定光合速率日变化曲线,生长锥法测定径向生长,样方法研究天然更新和土壤种子库,扦插育苗法研究育苗优化。结果表明:1)净光合速率日变化曲线5月和10月呈单峰曲线,6—9月均为双峰曲线,上午峰值大于下午;月平均光合速率大小顺序为9月>8月>6月>7月>5月>10月。2)累计径向生长量增量持续上涨,由2015年的274μm增加到2019年的565μm,增长率106.20%,生长初期增长率(262.86%)大于生长末期(149.60%)。3)天然更新较差,幼苗密度仅231株/hm²,多随机分布,种群处于衰退状态;土壤种子密度9.58粒/m²,集群型散布在母株冠幅内,0~5cm层居多,处于休眠生理后熟期。4)不同浓度、时间梯度的ABT6^#生根粉+2%蔗糖混合液处理,插条生根响应不同,200mg/L下处理3h效果最好。

Taken typical natural sabina przewalskill forests at the eastern section of southern slope of Qilian mountains as research objects,the daily variation curve of net photosynthetic rate(P_n) was measured by Li-6800 portable photosynthetic system,radial growth was measured by growth cone method,natural regeneration and soil seed bank were studied by sample method,cutting seedling method was used to study the cutting seedling optimization.The results showed that:1) the diurnal curve of net photosynthetic rate showed a single-peak curve in May and October,there wasdouble-peak curve from June to September,the morning peak was greater than that in the afternoon; the order of monthly average photosynthetic rate was:September>August>June>July>May>October.2) the cumulative radial growth increment continued to rise,it increased from 274μm in 2015 to 565μm in 2019,incremental rate 106.20%,the growth rate in the early growth stage(262.86%) was higher than that in the late growth stage(149.60%).3) the natural regeneration was poor,the seedling density was only 231 plants/hm²,most of them were randomly distributed,the population was in a declining state; soil seed density was 9.58 grains/m²,distributed within the crown width of the mother plant,majority was in the 0~5cm layer,in the postmature stage of dormancy physiology.4) different concentrations and time gradients of ABT6^# rooting powder&2% sucrose mixture solution treatment,the rooting response of the cuttings was different,the best way to root cuttings was the treatment of 200mg/L mixed solution for 3 hours.