沙区农田防护林蒸散效益研究

本文通过分析农田防护林网内作物蒸散作用,阐述了农田防护林的蒸散效益。研究表明,林网内作物蒸散比对照地平均提高12-1 % ,有效改善了作物的生理作用。

补阳还五汤对自身免疫性脑脊髓炎模型小鼠神经保护作用的机制探讨

目的:探讨补阳还五汤(BYHWT)在实验性自身免疫性脑脊髓炎(EAE)发展的不同阶段的神经保护作用和机制。方法:采用髓鞘少突胶质细胞糖蛋白35-55多肽(MOG35-55)诱导36只C57BL/6雌性小鼠建立实验性自身免疫性脑脊髓炎(EAE)模型,随机分为EAE 9,17,28 d组以及BYHWT 9,17,28 d组。BYHWT各组于免疫后第3天开始灌胃给药(50 g·kg^-1·d^-1),EAE组以相同方式等体积给予生理盐水,每天1次,连续至免疫后9,17,28 d。采用国际通用的五级临床症状评分观察BYHWT对EAE小鼠的干预作用;采集小鼠脊髓标本,进行苏木素-伊红(HE)染色和固蓝(LFB)染色观察BYHWT的神经保护作用;采用蛋白免疫印迹法(Western blot)检测脊髓神经营养因子(BDNF)和生长相关蛋白-43(GAP-43)等的表达。结果:补阳还五汤治疗后可明显抑制脊髓炎细胞浸润,减轻髓鞘脱失;与EAE组比较,BYHWT各给药组Nogo-A在脊髓表达显著下调(P <0. 01),与EAE 17,28 d组比较,BYHWT 17 d组和28 d组BDNF在脊髓中表达明显上调(P <0. 05,P <0. 01);与EAE 9,17 d组比较,BYHWT 9,17 d组GAP-43在脊髓中表达显著上调(P <0. 01)。结论:补阳还五汤可以通过上调NTFs类物质的表达,下调神经抑制因子的表达,改善局部神经生长微环境而发挥神经保护的作用。

Individual Growth Environment Suitable for Naturally Regenerated Young Pinus koraiensis under Secondary Natural Forest

Impacts on growth of young trees of Pinus Koraiensis of 6 environmental factors of intensityof sunlight, direct sunlight, thickness of soil humus, neighboring trees, upper canopy species, herbs andshrubs were investigated on young tree of Pinus Koraiensis and 4 neighboring trees which are consideredthe structural unit of the microenvironment. Results indicated that the 6 environmental factors underinvestigation had effects, to various extents, on growth of the young trees. Based on the findings, suitablegrowing conditions for regenerated young tree of Pinus Koraiensis under forest were identified andcorresponding silvicultural measures were proposed for operational practice.