遮阴对浙北地区七叶一枝花生理生化指标及皂苷含量的影响

七叶一枝花[Paris polyphylla Smith var.chinensis(Franch.)Hara]为药材重楼的药源植物,具有较好的抗肿瘤、抗炎等作用;野生七叶一枝花生于海拔1800~3200 m林下,目前已资源匮乏,人工栽培尚不成规模,同时,七叶一枝花生长受光强影响显著,强度不适时植株易萎蔫死亡,因此,研究遮阴处理对人工培育优质七叶一枝花具有重要意义。本文以6年生的七叶一枝花为试验材料,设置不同遮阴条件(70%、80%、90%),对重楼皂苷含量、光合色素含量、抗氧化酶活性、MDA含量、可溶性物质含量等指标进行测定,探究遮阴程度对七叶一枝花中皂苷成分的影响规律。结果显示,重楼皂苷含量与SOD活性、POD活性、MDA含量存在显著负相关性(P<0.05),与叶绿素a/b、CAT活性、可溶性蛋白质含量存在显著正相关(P<0.05);在遮阴80%的处理下,重楼皂苷含量最高(重楼皂苷Ⅰ为1.45 mg∙g^(-1),重楼皂苷Ⅵ为2.52 mg∙g^(-1),重楼皂苷Ⅶ为3.22 mg∙g^(-1),总重楼皂苷为7.19 mg∙g^(-1));同时该遮阴下各项光合色素指标和可溶性蛋白质含量(11.28 mg∙g^(-1))均为最高,POD(2.89 U∙g^(-1)∙min^(-1))和SOD(105.01 U∙g^(-1)∙min^(-1))活性最低,MDA(11.90μmol∙g^(-1))和脯氨酸(FP,8.88 mg∙g^(-1))含量最低。综上所述,不同的遮阴程度对七叶一枝花中重楼皂苷含量和初生代谢影响较大;其中80%遮阴处理有利于其重楼皂苷合成和积累,有利于光合色素和可溶性蛋白质含量的提高;较高或较低遮阴对七叶一枝花生长和重楼皂苷的含量均产生不利影响。本研究结果可为优化七叶一枝花人工栽培措施及获得优质药材提供理论参考。

Influencing factors and contribution analysis of CO_(2) emissions originating from final energy consumption in Sichuan Province,China

Within the context of CO_(2)emission peaking and carbon neutrality,the study of CO_(2)emissions at the provincial level is few.Sichuan Province in China has not only superior clean energy resources endowment but also great potential for the reduction of CO_(2)emissions.Therefore,using logarithmic mean Divisia index(LMDI)model to analysis the influence degree of different influencing factors on CO_(2)emissions from final energy consumption in Sichuan Province,so as to formulate corresponding emission reduction countermeasures from different paths according to the influencing factors.Based on the data of final energy consumption in Sichuan Province from 2010 to 2019,we calculated CO_(2)emission by the indirect emission calculation method.The influencing factors of CO_(2)emissions originating from final energy consumption in Sichuan Province were decomposed into population size,economic development,industrial structure,energy consumption intensity,and energy consumption structure by the Kaya-logarithmic mean Divisia index(LMDI)decomposition model.At the same time,grey correlation analysis was used to identify the correlation between CO_(2)emissions originating from final energy consumption and the influencing factors in Sichuan Province.The results showed that population size,economic development and energy consumption structure have positive contributions to CO_(2)emissions from final energy consumption in Sichuan Province,and economic development has a significant contribution to CO_(2)emissions from final energy consumption,with a contribution rate of 519.11%.The industrial structure and energy consumption intensity have negative contributions to CO_(2)emissions in Sichuan Province,and both of them have significant contributions,among which the contribution rate of energy consumption structure was 325.96%.From the perspective of industrial structure,secondary industry makes significant contributions and will maintain a restraining effect;from the perspective of energy consumption structure,industry sector has a significant contribution.The results of this paper are conducive to the implementation of carbon emission reduction policies in Sichuan Province.

L波段调Q锁模类噪声方波脉冲光纤激光器

报道了L波段掺铒光纤激光器中调Q锁模类噪声方波脉冲的演化特性。通过改变泵浦功率以及偏振状态,激光器可以在1600 nm处实现类噪声方波脉冲的连续波锁模和调Q锁模运作。类噪声方波脉冲基频锁模重复率为1.64 MHz,最大脉冲宽度为17.51 ns。类噪声方波脉冲调Q锁模的重复率可从8.14 kHz调谐至18.18 kHz,调Q锁模包络宽度与方波脉冲宽度随泵浦功率演化趋势相反,调Q包络的最高平均能量可达1115.5 nJ,包络内方波脉冲的最大平均能量可达24.89 nJ,方波脉冲的峰值功率维持在1 W左右。该实验结果有助于人们深入理解L波段调Q锁模类噪声方波脉冲的动力学特性。