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1.
以小球藻和铜绿微囊藻为研究对象,设置不同的光照(2 000、4 000、6 000、8 000、10 000 lx),测量小球藻和铜绿微囊藻的藻细胞数量、吸光度值(OD_(680))、叶绿素荧光(F_v/F_m),并计算两种藻的比生长速率.结果表明,小球藻最佳光照强度为6 000 lx,在光照强度6 000 lx之后随着光照强度增加,小球藻生长受抑制明显,铜绿微囊藻最佳光照强度为4 000 lx,说明铜绿微囊藻较耐受弱光,而小球藻更耐强光. 相似文献
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本研究采用最先进的光合作用测定系统LI-6400测定多功能树种白桦种苗的光合作用.天然白桦种苗光合速率日进程表现为
单峰曲线，在下午14：00时达到最高峰(10.53 μ mol CO2 m-2 s-1)，.其光合作用不存在“午休现象”.在14：00时，白桦的气孔限制值
(0.3172)和水分饱和亏缺(2.46 kPa)分别达到最大值，此时其水分利用效率较高，在中午12：00时水分利用率达到最大值(2.97μ
molCO2m-2 s-1mmH2Om-2s-1).在早上8：00，白桦获得一天中最大的表观量子效率；其蒸腾速率在下午14：00时最大(4.82mmH2O
m-2s-1).在光合速率的日进程中，白桦高光合速率值持续至少4个小时.这使得白桦的光合作用量得以有效累积，进而为其生长创
造了有利条件. 相似文献
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为了探讨鸡冠花不同耐热品种间光合特性的关系,选用耐热品种世纪绿叶和不耐热品种世纪铜叶为研究对象,在室外高温条件下系统地研究二者的光合特性.结果表明:2 品种鸡冠花的净光合速率和光合有效辐射的日变化均呈单峰曲线,且变化趋势相似且同步,净光合速率和光合有效辐射成正相关,表现为阳性植物特征,但耐热品种世纪绿叶的净光合速率低于世纪铜;气孔导度与净光合速率、蒸腾速率、光合有效辐射和胞间CO2浓度成正相关;在正午12:00时高光照、高叶温条件下,耐热品种世纪绿能在较大范围内维持相对较高的光合效率,世纪绿的光饱和点、光补偿点显著高于世纪铜,二者的光饱和点分别为1500 μmol·m-2·s-1和1000 μmol·m-2·s-1,光补偿点分别为39.3μmol·m-2·s-1和37.1μmol·m-2·s-1;而CO2饱和点分别为1000 μmol/mol和850 μmol/mol,CO2补偿点分别为112. μmol/mol和100.3 μmol/mol.为鸡冠花栽培提供了理论依据. 相似文献
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土壤呼吸及其组分随森林演替的变化对于长期碳循环模型及其地下碳储量至关重要.为了研究土壤呼吸随森林演替的变化及其影响机制,在2019年大兴安岭地区选取草地(GL)、白桦林(BF)、白桦与落叶松混交林(MF)、落叶松林(LF)4个不同演替阶段并对其进行研究.采用壕沟法测定自养(RA)和异养(RH)呼吸.结果 表明,GL、BF、MF和LF的土壤呼吸(RS)分别为3.11,5.68,5.54和4.69 μmol·m-2·s-1,RH分别为2.37,4.56,4.31和3.50 μmol·m-2·s-1,RA分别为0.74,1.12,1.23和1.19 μmol·m-2·s-1,GL、BF、MF、LF去除凋落物后Rs值分别为3.01,5.21,5.24和2.88 μmol·m-2·s-1.GL、BF、MF和LF中RA对Rs的贡献分别为23.79％,19.72％,22.20％和25.37％.演替阶段对Rs有显着影响(P＜0.05).回归分析发现,RA与细根生物量呈正相关(P＜0.01),RH与森林凋落物质量呈显著正相关(P＜0.05).试验的结果强调了演替阶段对土壤呼吸不同成分的重要性及其对估算森林碳汇潜力的重要性. 相似文献
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以常熟白芹的带节茎段和顶芽为外植体进行离体培养,对外植体的灭菌方法、培养基中不同种类生长调节物质的浓度对增殖和生根的影响以及试管苗的保存方法等进行了研究．结果表明：以0．1％的HgCl2为灭菌剂,对水芹顶芽处理8min可以获得无菌苗30％;丛生试管苗切割成单株后接种在MS＋6-BA0．5～1．5mg·L。的增殖培养基上培养28d,平均增殖系数可达10．5以上;试管苗在1／2MS培养基上培养14d后,生根率达100％,21d时平均每株生根16．5条;试管苗用1mg·L。的NAA浸泡切口处24h,再用清水培养10d后,生根率达100％,平均每株生根22．8条;炼苗后移植成活率100％．在温度为15℃、光照时间12h·d^-1、光照强度20μmol·m^-2·s^-1的培养条件下,试管苗在含6-BA0．5mg·L^-1的增殖培养基上可保存6个月;MS培养基中Ca^2＋离子浓度加倍,可延长试管苗保存时间1-1．5个月． 相似文献
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研究了向日葵种子根的向光反应特性及光照时间、光照强度IAA和GA3对其向光性的影响。结果表明:(1)向日葵种子根表现为负向光性倾斜生长;(2)在2~8h的光照时间内,向日葵种子根的负向光性与光照时间成正比;(3)在5~25 lx的光强范围内,向日葵种子根的负向光性与光强成正比;(4)0~10-4mol.L-1的IAA可促进根的伸长和增强其负向光性反应,随着IAA浓度的升高,向日葵种子根的负向光性反应消失,生长也受到抑制;(5)10-5~10-4 mol.L-1的GA3能促进向日葵种子根的伸长,但对其负向光性无明显影响。 相似文献
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不同土壤条件对曼地亚红豆杉幼苗的影响 总被引：2，自引：0，他引：2
对曼地亚红豆杉在不同土壤条件下的生长及代谢的研究表明:酸壤、碱壤条件下生长的曼地亚红豆杉光饱和点分别为:1 050μmol.m-2.s-1,887μmol.m-2.s-1;光补偿点分别为136μmol.m-2.s-1,117μmol.m-2.s-1.酸性土壤下的幼苗增大了叶绿素含量、净光合速率和可溶性糖含量,而光呼吸速率和可溶性蛋白质降低.酸壤下生长的幼苗叶绿素含量、表观量子效率、叶片厚度、叶面积及生物量较高.酸性土壤环境是曼地亚红豆杉较适宜的生长环境. 相似文献
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罗勒是一种食药兼用的资源植物。通过对罗勒光合特性的研究,旨在为罗勒的栽培提供理论依据。实验结果表明：罗勒的光合日变化呈双峰型,第一峰出现在上午11：00左右,Pn约为7.87μmolCO2.m-2.s-1,第二峰值出现在15：00左右,Pn约为5.68μmolCO.2m-2.s-1,＂午休＂现象明显。在400μmol.mol-1CO2浓度下,罗勒的光饱和点为1 800μmol.m-2.s-1左右,光补偿点为75μmol.m-2.s-1左右,CO2饱和点在600μmolCO2.mol-1左右,而CO2补偿点约为60.7μmolCO2.mol-1。 相似文献
9.
淡黄花百合的离体保存 总被引：3，自引：0，他引：3
对淡黄花百合组培苗的离体保存研究结果表明:在培养温度15-24℃,光照时间11h/d,光照强度1500lx条件下,最适培养基为添加1-3%甘露醇的MS培养基,保存10个月后存活率为92%左右,存活的幼苗接种于增殖培养基上,100%正常生长和增殖. 相似文献
10.
运用Li-6400光和仪对紫玉兰的叶绿素荧光动力学曲线、淬灭分析、荧光先曲线以及荧光ACI曲线等生理特性进行测定和对比分析,结果表明:随光照时间的加长.紫玉兰的荧光参数电子传递速率(ETR)、光化学猝灭系数(qP)和非光化学猝灭系数(NPQ)逐渐上升并在30 min左右迭到稳定.最大荧光产量Fm'在叶片转入黑暗后逐渐上升,NPQ则开始下降,两者约在52min趋于稳定.光照下PSⅡ实际的光化学量子效率(PhiPS2)和CO2同化速率相对应的量子产量(PhiCO2)呈线性正相关(p＜0.01),并随着光照强度的增加而减小.紫玉兰对CO2浓度变化比较敏感,在50-300μmol·mol-1浓度范围内,增加CO2浓度能显著提高紫玉兰的PhiPS2和PhiCO2值. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
14.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
15.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
16.
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
17.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
18.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
19.
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献