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小汪沟铁矿地表塌陷坑出露规律与动态绿化
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作者 赵云峰 《黄金》 CAS 2024年第7期102-105,共4页
崩落采矿法在铁矿石地下开采中广泛应用,但开采引起的地表塌陷破坏植被,是造成碳汇损失的主要原因,如何安全地控制地表塌陷范围与动态绿化,是低碳开采中需要首先解决的共性难题。针对这一问题,统计分析地表塌陷坑的出露规律,根据塌陷坑... 崩落采矿法在铁矿石地下开采中广泛应用,但开采引起的地表塌陷破坏植被,是造成碳汇损失的主要原因,如何安全地控制地表塌陷范围与动态绿化,是低碳开采中需要首先解决的共性难题。针对这一问题,统计分析地表塌陷坑的出露规律,根据塌陷坑间距计算公式,沿回采工作面的推进方向推算塌陷坑出露部位,即为卡车回填废石路线时须避开的危险部位;在塌陷坑周边选择两处方向垂直、边壁下部被散体较好覆盖的位置,作为废石回填地点,用卡车运送露天采场剥离的废石,沿两个相互垂直的方向安全回填塌陷坑。在塌陷坑回填到预定高度后,对非采动活跃区的充填体进行覆土动态绿化,同时对地表裂缝用碎石与黏土充填。采取这些措施后,小汪沟铁矿塌陷区绿化面积达87%,有效维持了矿区生态环境,大幅降低了碳汇损失。 展开更多
关键词 地下开采 地表塌陷 塌陷坑回填 动态绿化 碳汇损失
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DYNAMIC CHANGES OF INORGANIC NITROGEN AND ASTAXANTHIN ACCUMULATION IN HAEMATOCOCCUS PLUVIALIS 被引量:2
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作者 刘建国 殷明炎 +2 位作者 张京浦 刘伟 孟昭才 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2002年第4期358-364,共7页
This study on dynamic changes of culture color, astaxanthin and chlorophylls, inorganic N including N NO - 3, N NO - 2 and N NH + 4 in batch culture of Haematococcus pluvialis exposed to different additive nitrate con... This study on dynamic changes of culture color, astaxanthin and chlorophylls, inorganic N including N NO - 3, N NO - 2 and N NH + 4 in batch culture of Haematococcus pluvialis exposed to different additive nitrate concentration showed (1) ast/chl ratio was over 0.8 for brown and red algae, but was usually less than 0.5 for green and yellow algae; (2) N NO - 3, in general, was unstable and decreased, except for a small unexpected increase in nitrate enriched treatment groups; (3) measurable amounts of N NO - 2 and N NH + 4 were observed respectively with three change modes although no external nitrite and ammonia were added into the culture; (4) a non linear correlation between ast/chl ratio (or color) changes and the levels of N NO - 3 , N NO - 2 , N NH + 4 in H. pluvialis culture; (5) up and down variation of the ast/chl ratio occurred simultaneously with a perceptible color change from yellow to brown (or red) when N NO - 3, N NO - 2 and N NH + 4 fluctuated around 30, 5, 5 μmol/L respectively; (6) existence of three dynamic modes of N NO - 3, N NO - 2 and N NH + 4 changes, obviously associated with initial external nitrate; (7) the key level of total inorganic N concentration regulating the above physiological changes during indoor cultivation was about 50 μmol/L; and (8) 0.5-10 mmol/L of nitrate was theoretically conducive to cell growth in batch culture. 展开更多
关键词 Haematococcus pluvialis NITRATE NITRITE AMMONIA ASTAXANTHIN
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