三江源玛珂河林区寒温性针叶林优势草本种间联结研究

三江源自然保护区玛珂河林区的草本植物对寒温性针叶林的早期演替和生态恢复有着十分重要的影响。该文通过χ2统计量检测、共同出现百分率和联结系数方法,对40块寒温性针叶林样地中的22种优势草本的种间联结性进行定量分析,结果表明:231对优势草本组合中,有118对呈现正联结,其中有8对呈极显著正联结(P<0.01),6对呈显著正联结(P<0.05);负联结有112对,仅有2对优势草本物种呈显著负联结(P<0.05);完全独立的有1对。可见,玛珂河林区寒温性针叶林中,超过一半的草本物种的生态学和生物学特性相似,表现为正联结,并且未达到显著水平;同时也有接近一半的优势草本物种之间竞争有限的环境资源而产生竞争和排斥。

三江源自然保护区玛珂河林区寒温性针叶林优势灌木种间联结研究

Ma Kehe forest region is one of the core areas in San Jiangyuan National Nature Reserve. A large number of shrub species distribute in the cold temperate coniferous forest, which have important influence on the succession and restoration of the cold temperate coniferous forest. A series of techniques including relative tests and calculation of the percentage of co-occurrence were used to analyze the interspecific association among 20 dominant shrub species in 40 plots in Ma Kehe forest region of San Jiangyuan National Nature Reserve. The results showed that most of interspecific association of dominant shrub species was significantly negative. Only 69 species pairs were of positive correlation among 190 dominant shrub species pairs, 113 species pairs were of negative correlation, 8 species pairs were of absolute independent correlation. So, only a few dominant shrub species had positive interspecific association, most of them had little opportunity to use the same resources and occupy similar niche in the same community due to their competitions in Ma Kehe forest region.

掘进工作面风流与粉尘运移规律及控尘技术分析

为有效降低花园煤矿掘进工作面高浓度粉尘的有害影响,选定花园煤矿五采区西翼轨道巷掘进工作面作为研究对象,通过仿真数值模拟,对比分析了传统单一压入式通风以及长压短抽式通风方式,并在工程现场进行了实测验证,分析研究得到了掘进面风流-粉尘两相流运移分布规律,长压短抽式通风方式较传统单一式通风方式更为有效,除尘率可达70%以上,可有效防控粉尘问题。

关于煤矿采煤技术及安全管理的思考

煤炭是我国重要的能源构成部分,煤炭产业的开发与利用也是社 会中人们关注的重点。在社会经济发展进程中,煤矿采煤技术不断优化, 在一定程度上提高了煤矿采煤质量及产量。但是在煤矿采煤过程中,仍 然存在较大的安全风险问题,影响了煤矿采煤作业顺利进行。鉴于此, 本文对煤矿采煤技术及安全管理进行了分析,以供参考。