Search

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] To better understand the variation rule of soil carbon pool composition and soil nutrient before and after afforestation and the influence of soil nutrient to soil carbon pool composition in reclaimed mine.[Method] This study was conducted in grassland and forest land of Populus alba var. pyramidalis in reclaimed mine to explore the variation and relation of soil inorganic carbon pool, active organic carbon pool, chronic organic carbon pool, inert organic carbon pool and soil nutrient, and contribution of soil nutrient to soil carbon. [Result] The results showed that the contents of soil nutrients and soil carbon increased after afforestation in reclaimed mine. The content of soil total nitrogen, available nitrogen, total phosphorous, available phosphorous, total potassium and available potassium in forest land increased by 29.27%, 17.21%, 23.08%, 27.04%, 51.18% and 53.19% than in grassland, while the content of soil nitric nitrogenin forest land decreased by 71.84% than in grassland. The content of soil organic carbon, particle organic carbon, non-particle organic carbon, dissolved inorganic carbon, dissolved organic carbon, microbial biomass carbon and reducing sugar carbon in forest land increased by 50.35%, 62.46%, 22.56%, 113.53%,230.23%, 274.63% and 72.54% than in grassland. There was a significant positive correlation between soil inorganic carbon pool and active organic carbon pool, but no significant correlation with chronic organic carbon pool and inert organic carbon pool. The soil nutrient factors accounted for 40.7% of contribution rate to soil carbon sequestration.The correlation analysis also showed that there was a significant positive correlation between soil total potassium,available potassium and carbon pool composition. [Conclusion] The comprehensive analysis shows that afforestation can improve the soil nutrient status and carbon sequestration significantly in reclaimed area of Wuhai opencast coal mine. This conclusion can be used as a reference for further study on the improvement of soil quality and the restoration of ecological function in reclaimed mine of arid desert areas. [ABSTRACT FROM AUTHOR]

Objective: To explore the analgesic effect of pregabalin combined with kushen injection, and try to provide experimental evidences for clinical drug usage. Methods: L5 spinal nerve ligation model was established in rats. The successful neuropathic pain rats were randomly divided into 3 groups according to the pain level: kushen injection group, pregabalin group, and kushen injection+pregabalin group. Von Frey cellosilk to was used to measure the paw withdrawal threshold, and hot plate to was used to measure the paw withdrawal latency. Results: With kushen injection once per day, the mechanical threshold was improved on the 7th day of the treatment and the heat threshold was improved on the 21 th day. 30 minutes after oral usage of pregabalin, both the mechanical and heat threshold was significantly improved. However, the mechanical thresholds reduced to the level before the drug usage on the 7th day,the heat thresholds reduced to the level before the drug usage on the 4th day. With pregabalin and kushen injection given together, the mechanical and heat threshold increased significantly after the 1st day of drug usage and the analgesic effect was maintained until the end of the experiment(the 28 th day). Conclusions: Kushen injection took effect slowly, but resistsed drug tolerance. Pregabalin, showed effect fast but was prone to drug tolerance. Pregabalin combined with kushen injection yields better clinical result. [ABSTRACT FROM AUTHOR]