为揭示蒙古冰草对氮添加的响应机制,设置5个氮添加水平(0,0.8,1.6,2.4,4.0 g N·m^(-2)·a^(-1))对蒙古冰草进行为期2个月处理后,测定根系、叶片中可溶性糖、淀粉、碳(C)、氮(N)、磷(P)的含量,分析氮添加对蒙古冰草叶片、根系...为揭示蒙古冰草对氮添加的响应机制,设置5个氮添加水平(0,0.8,1.6,2.4,4.0 g N·m^(-2)·a^(-1))对蒙古冰草进行为期2个月处理后,测定根系、叶片中可溶性糖、淀粉、碳(C)、氮(N)、磷(P)的含量,分析氮添加对蒙古冰草叶片、根系非结构性碳水化合物(NSCs)与C、N、P含量及其化学计量特征关系的影响。结果表明:2.4 g N·m^(-2)·a^(-1)的氮素添加显著提高了蒙古冰草叶片、根系NSCs含量与C、N、P含量,且不同器官的响应有显著差异性(P<0.05)。叶片NSCs含量与叶片N、可溶性糖、淀粉含量、C/P及N/P呈显著正相关关系,与叶片P含量、C/N呈显著负相关关系(P<0.05);根系NSCs含量与根系C、N、C/P、N/P、可溶性糖和淀粉含量呈显著正相关(P<0.05)。叶片与根系N/P是影响蒙古冰草体内可溶性糖积累的主要因子;根系N含量与叶片P含量共同影响淀粉含量;叶片P含量、根系N含量及根系N/P综合影响NSCs含量。综上,适量的氮添加会缓解研究区蒙古冰草的N限制,促进NSCs合成,而大量氮添加会导致N、P比例失衡,加剧P限制。因此,未来气候变化背景下蒙古冰草人工草地种植或退化草地恢复管理过程中需要考虑优化氮肥施用量与适当的磷添加。展开更多
The growth characteristic of intermetallics during the reaction of solid (Cu,Ag,Au,Fe,Co,Ni,etc) with liquid (Sn,Sb,Bi,Zn) within a very short time of 1～ 2 s at different temperatures has been studied by metallograph...The growth characteristic of intermetallics during the reaction of solid (Cu,Ag,Au,Fe,Co,Ni,etc) with liquid (Sn,Sb,Bi,Zn) within a very short time of 1～ 2 s at different temperatures has been studied by metallographic method for explaining the process in the fillet during soldering. It is indicated that the incongruent compourds often grow up as bamboo shoot form. But congruent compounds grow up basically just by spreading out as a layer along the solid border. Base on these facts,the influence of intermetallics in the fillet during soldering has been discussed.展开更多
Intermetallic compound SbSn of different crystal structure was prepared by melting rapidly quench. Surface structure of obtained material was characterized by AES and XPS. Results revealed that the contents of Sb in t...Intermetallic compound SbSn of different crystal structure was prepared by melting rapidly quench. Surface structure of obtained material was characterized by AES and XPS. Results revealed that the contents of Sb in the surface of material (a) prepared at the condition of voltage 30 V, current 400 A, and quench speed 30 m·s-1 were greater than that (b) prepared at the condition of voltage 20 V, current 20 A, and quench speed 30 m·s-1, and the valence state of Sb in the surface of the material prepared at the first condition was +3; while that prepared at the second condition was zero. The structures and desulfurization performance of material prepared at different quench speeds were studied. Result shows that the material being prepared at the condition of voltage 30 V, current 400 A, the composition of trigonal system crystal structure increase with the quench speed, and its desulfurization performance was also enhanced with the quench speed.展开更多
文摘为揭示蒙古冰草对氮添加的响应机制,设置5个氮添加水平(0,0.8,1.6,2.4,4.0 g N·m^(-2)·a^(-1))对蒙古冰草进行为期2个月处理后,测定根系、叶片中可溶性糖、淀粉、碳(C)、氮(N)、磷(P)的含量,分析氮添加对蒙古冰草叶片、根系非结构性碳水化合物(NSCs)与C、N、P含量及其化学计量特征关系的影响。结果表明:2.4 g N·m^(-2)·a^(-1)的氮素添加显著提高了蒙古冰草叶片、根系NSCs含量与C、N、P含量,且不同器官的响应有显著差异性(P<0.05)。叶片NSCs含量与叶片N、可溶性糖、淀粉含量、C/P及N/P呈显著正相关关系,与叶片P含量、C/N呈显著负相关关系(P<0.05);根系NSCs含量与根系C、N、C/P、N/P、可溶性糖和淀粉含量呈显著正相关(P<0.05)。叶片与根系N/P是影响蒙古冰草体内可溶性糖积累的主要因子;根系N含量与叶片P含量共同影响淀粉含量;叶片P含量、根系N含量及根系N/P综合影响NSCs含量。综上,适量的氮添加会缓解研究区蒙古冰草的N限制,促进NSCs合成,而大量氮添加会导致N、P比例失衡,加剧P限制。因此,未来气候变化背景下蒙古冰草人工草地种植或退化草地恢复管理过程中需要考虑优化氮肥施用量与适当的磷添加。
文摘The growth characteristic of intermetallics during the reaction of solid (Cu,Ag,Au,Fe,Co,Ni,etc) with liquid (Sn,Sb,Bi,Zn) within a very short time of 1～ 2 s at different temperatures has been studied by metallographic method for explaining the process in the fillet during soldering. It is indicated that the incongruent compourds often grow up as bamboo shoot form. But congruent compounds grow up basically just by spreading out as a layer along the solid border. Base on these facts,the influence of intermetallics in the fillet during soldering has been discussed.
基金supported by the National Natural Science Foundation of China (21271054, 21173060)Major Research Plan of the National Natural Science Foundation of China (91326113, 91226201)Fundamental Research Funds for the Central Universities, China (HEUCF201403001)~~
文摘Intermetallic compound SbSn of different crystal structure was prepared by melting rapidly quench. Surface structure of obtained material was characterized by AES and XPS. Results revealed that the contents of Sb in the surface of material (a) prepared at the condition of voltage 30 V, current 400 A, and quench speed 30 m·s-1 were greater than that (b) prepared at the condition of voltage 20 V, current 20 A, and quench speed 30 m·s-1, and the valence state of Sb in the surface of the material prepared at the first condition was +3; while that prepared at the second condition was zero. The structures and desulfurization performance of material prepared at different quench speeds were studied. Result shows that the material being prepared at the condition of voltage 30 V, current 400 A, the composition of trigonal system crystal structure increase with the quench speed, and its desulfurization performance was also enhanced with the quench speed.
