Zhang Xue, Chen Da-Xia, Li Long-Yun, Yang Xian, Song Xu-Hong
Zhongguo Zhong Yao Za Zhi. 2014 Oct;39(20):3915-21.
Plant samples were collected and investigated periodically. According to the growth of different parts and the characteristics of dry substance accumulation of Scrophularia ningpoensis, the development of S. ningpoensis could be divided into four stages: seeding stage, stem and leaf growth stage, expanding period of root tubers, and dry substance accumulation stage of root tuber. Leaf numbers of S. ningpoensis grew gradually from one at first to 370 at the final stage, main stem leaf were 50 pieces. Leaf size increasesed with the fastest growth at the stem and leaf growth stage, average daily increase amount was 225 cm2. By the middle of August, leaf size reached to 16,270 cm2. Leaf area indexrose sharply in the seeding stage, and remained above 8 among stem and leaf growth stage and expanding period of root tubers, and rapidly reduced to zero in the stage of dry substance accumulation of root tuber. Leaf area ratio has a tendency of obvious dropping. The net assimilation rate had a small change ranges, two small peak were seeding stage and dry substance accumulation of root tuber. The value of specific leaf area was higher in seeding stage, and in the earlier stage of dry substance accumulation of root tuber. Relative growth rate changed with large ranges, higher in seeding stage, rapid decrease in stem and leaf growth stage, rose in expanding period of root tubers, and declined again in the stage of dry substance accumulation of root tuber. Crop growth rate was higher in the first and last stages, and smaller in interim stage. The growth parameters of S. ningpoensis such as relative growth rate, net assimilation rate, leaf area index, leaf area ratio, specific leaf area, crop growth rate changed along with the growth. The rule of dry matter accumulation was as follows: the dry matter increased slowly during the seeding stage and speeded up in the middle and late stages, and in dry substance accumulation of root tuber increased slower, the growth of dry matter all appeared an "S" curve, and accorded with logistic equation. Cultivation technologies of S. ningpoensis and the relevant management methods could be established according to the growth of different parts of S. ningpoensis and the characteristics of dry substance accumulation in different stage.
定期采集并调查植物样本。根据玄参不同部位的生长情况以及干物质积累特性，玄参的生长发育可分为四个阶段：苗期、茎叶生长期、块根膨大期和块根干物质积累期。玄参叶片数量从最初的1片逐渐增长至末期的370片，主茎叶片为50片。叶片大小在茎叶生长期增长最快，日均增加量为225平方厘米。到8月中旬，叶片大小达到16270平方厘米。叶面积指数在苗期急剧上升，在茎叶生长期和块根膨大期保持在8以上，在块根干物质积累期迅速降至零。叶面积比有明显下降趋势。净同化率变化幅度较小，在苗期和块根干物质积累期出现两个小高峰。比叶面积值在苗期较高，在块根干物质积累初期也较高。相对生长率变化幅度较大，苗期较高，茎叶生长期迅速下降，块根膨大期上升，块根干物质积累期又下降。作物生长率在第一阶段和最后阶段较高，中间阶段较小。玄参的相对生长率、净同化率、叶面积指数、叶面积比、比叶面积、作物生长率等生长参数随生长而变化。干物质积累规律如下：苗期干物质增加缓慢，中后期加快，块根干物质积累期增加较慢，干物质增长均呈“S”形曲线，符合逻辑斯蒂方程。可根据玄参不同部位的生长情况以及不同阶段干物质积累特性制定玄参的栽培技术及相关管理措施。
