摘要
驼绒藜属(Ceratoides)植物,在生态建设和经济利用方面有重要的作用。本文利用多池差示扫描量热仪(CSC4100)在10℃、15℃、20℃、25℃、30℃、35℃六个温度下,测定了驼绒藜属3个种(华北驼绒藜、驼绒藜、绵毛优若藜)15个种源植物的代谢热速率(Rq)和呼吸速率即CO_2产出速率(R_(CO_2)),根据L. D. Hansen呼吸-生长模型,计算不同温度下植物种的呼吸底物碳转化效率(ε)及其特殊生长速率(R_(SG)),预测其最适生长温度范围,比较不同驼绒藜属植物在呼吸代谢方面的差异。研究取得的初步结论如下:
1.计算出了15个不同种及种源驼绒藜属植物在不同温度下的底物碳转化效率值,发现他们在不同温度下会发生变化,并研究了他们的变化规律。
2.分析预测出了15个不同种及种源驼绒藜属植物的最适生长温度范围。
3.同种不同种源驼绒藜属植物的分析比较结果:
(1)科尔沁华北驼绒藜的最适生长温度范围比四子王华北驼绒藜的宽;
(2)根据底物碳转化效率值将12种种源的美国产绵毛优若藜进行聚类分析,结果分为四类;
(3)根据特殊生长速率值对12种种源的美国产绵毛优若藜进行聚类分析,结果分为五类。
4.同属不同种驼绒藜植物的分析比较结果:
(1)在17-28℃时,宁夏驼绒藜的底物碳转化效率与特殊生长速率均大于两个种源华北驼绒藜的,其他温度下反之;
(2)整体上华北驼绒藜、驼绒藜各温度下底物碳转化效率平均值高于绵毛优若藜;
(3)整体上绵毛优若藜的特殊生长速率值变化范围比华北驼绒藜、驼绒藜要宽;华北驼绒藜、驼绒藜较快特殊生长速率出现的温度范围集中于15-25℃之间,绵毛优若藜(卡特伦县绵毛优若藜除外)集中于22-32℃之间。
Ceratoides play important roles on ecological construction and economic utilization. Metabolic heat (Rq)and respiratory rates (R_(CO_2))of three Ceratoides species, which came from 15 seed collection sites, were determined by CSC4100 at 5℃intervals from 10℃to 35℃. Based on L. D. Hansen respiration-growth model, they were used to calculate and analyze the substrate carbon conversion efficiency (ε) and the specific growth rate(R_(SG)), then to predict optimal growth temperature scopes. At last, the respiratory metabolism characteristics of 15 Ceratoides of different seed sources were compared. Some conclusions were made in the thesis displayed below:
1. The substrate carbon conversion efficiencies of 15 Ceratoides from different seed sources at different temperatures are calculated and analyzed. They change with the temperatures.
2. The optimal growth temperature scopes of 15 Ceratoides from different seed sources are analyzed and predicted.
3. The comparison among different seed resources but in the same species:
(1) The optimal growth temperature scope of Keerqin Ceratoides arborescens is wider than that of Siziwang Ceratoides arborescens.
(2) Based on the substrate carbon conversion efficiency, the cluster analysis result of 12 Ceratoides lanata from American is that 12 varieties is classified into 4 categories.
(3) Based on the specific growth rate, the cluster analysis result of 12 Ceratoides lanata from American is that 12 varieties is classified into 5 categories.
4. The comparison among different species of Ceratoides:
(1) From 17℃to 28℃, the substrate carbon conversion efficiency and the specific growth rate of Ceratoides 1atens are higher than that of Ceratoides arborescens.
(2) Overall, the average value of substrate carbon conversion efficiency of Ceratoides arborescens and Ceratoides 1atens at different temperatures are separately higher than that of Ceratoides lanata.
(3) Overall, the specific growth rate variation range of Ceratoides lanata is wider than that of Ceratoides arborescens and Ceratoides 1atens. The temperature scope, where the specific growth rates is more faster, of species from China is between 15℃to 25℃, and of species from America (except Ceratoides lanata from Catron County ,New Mexico) is between 22℃to 32℃.
引文
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