The Kunlun Fault, an active fault on the border between the Bayan Har and Kunlun-Qaidam blocks, is one of the major left lateral strike-slip faults in the Tibetan Plateau. Previous research has not reached a consensus...The Kunlun Fault, an active fault on the border between the Bayan Har and Kunlun-Qaidam blocks, is one of the major left lateral strike-slip faults in the Tibetan Plateau. Previous research has not reached a consensus on agreeable slip rates along much of its length and the slip rate gradient along the eastern part, both of which play critical roles in a range of models for the eastward extrusion and thickened crust of the Tibetan Plateau. New slip rates have been determined at sites along the eastern part of the Kunlun Fault by dating deposits and measuring atop displaced fluvial terrace risers. Field investigations and interpretation of satellite images reveal geometrical features of the fault and the late Quaternary offset, new earthquake ruptures and surface-rupturing segmentation, from which long-term slip rates and earthquake recurrence intervals on the fault are estimated. The tectonic geomorphology method has determined that the long-term horizontal slip rates on the Tuosuohu, Maqin and Ma- qu segments from west to east are 11.2±1, 9.3±2, and 4.9±1.3 mm/a while their vertical slip rates are 1.2±0.2, 0.7±0.1, and 0.3 mm/a in the late Quaternary. Results indicate that the slip rates regularly decrease along the eastern -300 km of the fault from 〉10 to 〈5 mm/a. This is consistent with the decrease in the gradient such that at the slip rate break point is at the triple point intersection with the transverse fault, which in turn is transformed to the Awancang Fault. The vector decomposition for this tectonic transformation shows that the western and eastern branches of the Awancang Fault fit the slip-partitioning mode. The slip rate of the southwestern wall is 4.6 mm/a relative to the northeastern wall and the slip direction is 112.1°. The mid-eastern part of the Kunlun Fault can be divided into three independent segments by the A＇nyemaqen double restraining bend and the Xigongzhou intersection zone, which compose the surface rupture segmentation indicators for themselves as well as the ending poin展开更多
以‘宁粳2号’为材料，采用田间小区试验方法研究了单季粳稻施用镁肥后对镁吸收分配的影响。结果表明，从拔节到始穗期，水稻体内镁的阶段吸收量和吸收速度最高，分别为7．22kg·hm^-2和0．40kg·hm^-2·d^-1；从拔节期到...以‘宁粳2号’为材料，采用田间小区试验方法研究了单季粳稻施用镁肥后对镁吸收分配的影响。结果表明，从拔节到始穗期，水稻体内镁的阶段吸收量和吸收速度最高，分别为7．22kg·hm^-2和0．40kg·hm^-2·d^-1；从拔节期到齐穗期，镁肥的施用促进了水稻对镁的吸收，其它生育期对外界镁浓度变化不敏感；镁肥的施用降低了镁在茎鞘和叶片中的分配比例，提高了镁在穗部的分配比例；齐穗后15～30d为穗部积累镁的高峰期；在本实验范围内，随施肥水平的提高，稻米中的镁含量升高，RVA（Rapid of viscosity analysis）谱中最终黏度、回复值及消减值显著下降，最高黏度、热浆黏度和崩解值显著上升，糊化温度没有明显差异。施用镁肥提高了稻米食味品质，这其中以120kg·hm^-2用量效果最好。展开更多
基金supported by National Natural Science Foundation of China (Grant Nos. 40821160550 and 40974057)International Scientific Joint Project of China (Grant No. 2009DFA21280)
文摘The Kunlun Fault, an active fault on the border between the Bayan Har and Kunlun-Qaidam blocks, is one of the major left lateral strike-slip faults in the Tibetan Plateau. Previous research has not reached a consensus on agreeable slip rates along much of its length and the slip rate gradient along the eastern part, both of which play critical roles in a range of models for the eastward extrusion and thickened crust of the Tibetan Plateau. New slip rates have been determined at sites along the eastern part of the Kunlun Fault by dating deposits and measuring atop displaced fluvial terrace risers. Field investigations and interpretation of satellite images reveal geometrical features of the fault and the late Quaternary offset, new earthquake ruptures and surface-rupturing segmentation, from which long-term slip rates and earthquake recurrence intervals on the fault are estimated. The tectonic geomorphology method has determined that the long-term horizontal slip rates on the Tuosuohu, Maqin and Ma- qu segments from west to east are 11.2±1, 9.3±2, and 4.9±1.3 mm/a while their vertical slip rates are 1.2±0.2, 0.7±0.1, and 0.3 mm/a in the late Quaternary. Results indicate that the slip rates regularly decrease along the eastern -300 km of the fault from 〉10 to 〈5 mm/a. This is consistent with the decrease in the gradient such that at the slip rate break point is at the triple point intersection with the transverse fault, which in turn is transformed to the Awancang Fault. The vector decomposition for this tectonic transformation shows that the western and eastern branches of the Awancang Fault fit the slip-partitioning mode. The slip rate of the southwestern wall is 4.6 mm/a relative to the northeastern wall and the slip direction is 112.1°. The mid-eastern part of the Kunlun Fault can be divided into three independent segments by the A＇nyemaqen double restraining bend and the Xigongzhou intersection zone, which compose the surface rupture segmentation indicators for themselves as well as the ending poin
文摘以‘宁粳2号’为材料，采用田间小区试验方法研究了单季粳稻施用镁肥后对镁吸收分配的影响。结果表明，从拔节到始穗期，水稻体内镁的阶段吸收量和吸收速度最高，分别为7．22kg·hm^-2和0．40kg·hm^-2·d^-1；从拔节期到齐穗期，镁肥的施用促进了水稻对镁的吸收，其它生育期对外界镁浓度变化不敏感；镁肥的施用降低了镁在茎鞘和叶片中的分配比例，提高了镁在穗部的分配比例；齐穗后15～30d为穗部积累镁的高峰期；在本实验范围内，随施肥水平的提高，稻米中的镁含量升高，RVA（Rapid of viscosity analysis）谱中最终黏度、回复值及消减值显著下降，最高黏度、热浆黏度和崩解值显著上升，糊化温度没有明显差异。施用镁肥提高了稻米食味品质，这其中以120kg·hm^-2用量效果最好。
