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本文针对建筑物供热系统进出口、干管的堵塞,系统中环路发生的堵塞,外网干管堵塞等原因 进行了分析及探讨,确定了堵塞部位及解决方法。 相似文献
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指出了城市内湖水质问题在我国非常普遍,改善城市水环境质量,解决河流水域污染已成为政府部门工作重心。以长沙市龙王港梅溪湖为例,针对梅溪湖水质污染的三个主要原因:①滨湖截污干管渗漏严重;②上游小区分流不彻底;③现状雨水净化区容积较小,初期雨水污染无法得到完全净化。采用工程措施对截污干管进行了重建和修复,对初期雨水进行了收集和处理,根据初期雨水相关设计标准,合理设置智能截留井和初雨截留管,截留后初雨储存在调蓄池后转输至污水处理厂,能有效减少梅溪湖水质污染,对解决梅溪湖水质污染起到积极作用,为保障城市水环境和区域生态环境具有现实意义。 相似文献
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敷设污水管道要因地制宜。深圳宝安地区楼房林立,施工作业面狭小,经常涉及旧村内铺设管道,给水、雨水、通信电缆、高压电缆等地下管线错综复杂。本文试结合宝安地区各污水处理厂配套污水干管(一期)工程建设情况,简述该地区污水管道施工工艺。 相似文献
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文中提出了改善自然功率因数的几种方式,能减少投资、效果显著、关键在于管理和运行,提高使用水平。如果能做到文中的几点,会使我国的电网运行大大地改善。 相似文献
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对河北林学院办学经济效益进行了纵向研究,着重分析了其办学的投入指标,办学的产出指标以及林业专门人才培养费用指标。通过与其他院校比较,结果表明,我院的办学水平亟待提高,进而在宏观上提出了几条提高我院办学水平的思路。 相似文献
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油松-沙棘混交模式对生境和油松生长的影响 总被引:5,自引:0,他引:5
在陕北黄土丘陵沟壑区,以油松纯林为对照,对油松与沙棘行状混交、行状混交沙棘平茬、带状混交、宽行混交和宽行混交沙棘平茬林地的沙棘郁闭度、高度、光照强度、土壤水分、土壤密度、土壤空隙度、土壤养分及油松的存活率、高度、地径、顶梢年生长量等进行13年的监测研究.结果表明:行状混交与宽行混交的沙棘郁闭度、高度均高于行状混交沙棘平茬、宽行混交沙棘平茬和带状混交;林地的光照强度为油松纯林的较高,带状混交、宽行混交沙棘平茬、行状混交沙棘平茬的居中,宽行混交和行状混交的较低;土壤储水量在11年后表现为行状混交与宽行混交的较高,行状混交沙棘平茬、带状混交与宽行混交沙棘平茬的居中,油松纯林的较低;土壤密度、土壤空隙度、土壤养分表现为沙棘郁闭度、高度越高,土壤密度越低,土壤空隙度、土壤养分越高.与油松纯林相比,行状混交和宽行混交油松的高度和地径在6年以后明显较低,存活率在7年以后显著降低;行状混交沙棘平茬、宽行混交沙棘平茬与带状混交的油松高度在7年以后较高,行状混交沙棘平茬与宽行混交沙棘平茬的油松高度在10年以后高于带状混交的油松;行状混交沙棘平茬、宽行混交沙棘平茬与带状混交的油松地径在9年以后大于油松纯林的油松地径;行状混交沙棘平茬、宽行混交沙棘平茬和带状混交的油松顶梢年生长量在6年以后较大,行状混交和宽行混交的较小.油松与沙棘混交,行状混交沙棘平茬、宽行混交沙棘平茬和带状混交促进了油松的生长,行状混交和宽行混交降低了油松的存活率,抑制了油松的生长. 相似文献
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He Qingtang Song Conghe College of Forest Resources Environment Beijing
Forestry UniversityBeijing l P.R. China 《中国林学(英文版)》1994,(2)
EffectsofForestontheBudgetsofWater,EnergyandGasesintheEnvironmentHeQingtang,SongCongheCollegeofForestResourcesandEnvironment,... 相似文献
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Effect of hill fire on upland soil in Hong Kong 总被引:7,自引:0,他引:7
The present study compares the soil chemical properties of a new burnt site and an old burnt site, which had experienced three and one fire(s) respectively since 1988. The new burnt site is presently reduced to grassland and the old burnt site to mixed grassland/scrubland. Repeated fires raised soil pH by 0.27–0.33 units, exchangeable H and K by over 100%, but reduced total exchangeable acidity by 85%, organic matter by 86%, total Kjeldahl nitrogen by 75%, NH4 by 44%, NO3 by 42%, total phosphorus by 66%, exchangeable Na by 42%, Ca by 83%, Mg by 41%, Mn by 14%, Fe by 12% and Zn by 4% of the new burnt site against the old burnt site. Fire similarly reduced the effective cation exchange capacity (ECEC) and the base saturation by 85% and 90%, respectively. The occurrence of successive fires is therefore hazardous to the environment and in the absence of fire for 6 years the old burnt site has accumulated sufficient organic matter and nitrogen needed for the invasion of the more nutrient-demanding tree species. The selection of tree species and site preparation pertaining to enhancement planting of the fire-disturbed slopes to accelerate forest development are discussed. 相似文献
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在棚舍笼养环境下,使用0.05%棉酚饵剂和0.2%莪术醇饵剂对小白鼠的抗生育效果进行了对比试验研究。结果表明:交配前喂饲0.05%棉酚饵剂和0.2%莪术醇饵剂,与对照组相比较,怀胎下降率、平均胎仔下降率分别为20.0%、9.1%和60.0%、37.5%;交配后喂饲0.05%棉酚饵剂和0.2%莪术醇饵剂,与对照组相比较,怀胎下降率、平均胎仔下降率分别为25.0%、28.1%和33.3%、9.1%;两种抗生育剂对小白鼠均有显著的抗生育作用,但以0.2%莪术醇在交配前喂饲效果最佳;两种抗生育剂对小白鼠无毒性反应。 相似文献
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甲醛胁迫对3种室内观赏植物的生理生化影响 总被引:1,自引:0,他引:1
采用盆栽试验研究了甲醛胁迫后黄常山、短梗大参和袖珍椰子3种室内观赏植物叶片的生理生化指标变化,结果表明:甲醛胁迫后3种植物的生理生化指标与对照相比均有不同程度的变化。当甲醛浓度达到最高值288mg/m3时,与对照相比,黄常山叶片质膜相对透性升高64%,MDA含量升高178%,叶绿素含量降低51%,SOD与POD活性分别降低26%和55%;短梗大参叶片质膜相对透性升高10%,MDA含量升高19%,叶绿素含量降低43%,SOD与POD活性分别降低24%和25%;袖珍椰子叶片质膜相对透性升高9%,MDA含量降低24%,叶绿素含量降低30%,SOD与POD活性分别增加41%和36%。以生理生化指标的变化为基础,采用隶属函数法对3种植物的甲醛抗性进行综合评判,其抗性由强至弱为:袖珍椰子>短梗大参>黄常山。 相似文献
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本文采用卫星遥感影像与实地调查、查阅林地管理档案信息相结合的方法对西双版纳傣族自治州2017年林地变更情况进行了调查,同时将结果与2016年林地变更调查结果比对,并分析了林地资源现状、森林覆盖率变化情况、林地动态变化和原因。结果表明,西双版纳州2017年林地面积总量净增227.58hm^2,同比增加0.02%,其中,有林地(乔木林)面积减少2072.29hm^2,疏林地面积净增145.23hm^2,灌木林地面积净增1112.25hm^2,未成林地面积减少1131.69hm^2,苗圃地面积净增3.66hm^2、无立木林地面积净增3154.78hm^2、宜林地面积减少1006.35hm^2,林业辅助生产用地面积净增21.99hm^2。 相似文献
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A shortleaf pine (Pinus echinata Mill.) ripping study was established by the Missouri Department of Conservation in March 1988 at the Logan Creek Conservation
Area, USA. The objective of the study was to evaluate the effects of ripping on soil chemical and physical properties, on
free-to-grow status, and on survival and growth of planted shortleaf pine seedlings. After 16 years, ripping increased exchangeable
calcium; however, it had no long-term effects on soil particle size, organic carbon, pH, exchangeable potassium and exchangeable
magnesium. Ripping increased the percentage of free-to-grow saplings by 3.8% after two growing seasons. Ripping improved survival
by 4% during the 1st three growing seasons and by 7.1% at age 16. After two growing seasons, ripping improved crown spread
by 13.6%, height by 14.2%, diameter by 14%, and volume by 41.2%. At age 16, ripping no longer had an effect on shortleaf pine
height and had reduced diameter by 5.3% and volume by 11.0%. Our results suggest that ripping 1) had no effect on long-term
physical properties or chemical properties of the soil, 2) had no effect on the number of free-to-grow seedlings, and 3) produced
short-term benefits on survival and growth of planted shortleaf pine. 相似文献
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[目的]为了明确舞毒蛾幼虫对Mn^2+和Co^2+胁迫的响应机制。[方法]采用0.40 mmol·g^-1 Mn^2+和0.83 mmol·g^-1 Co^2+的两种混合饲料分别喂食舞毒蛾4龄幼虫,测定了Mn^2+和Co^2+(LC30)对舞毒蛾4龄幼虫体质量、营养取食情况、营养成分含量及总抗氧化力。[结果]与对照组相比较,其取食量、虫粪量、体质量增长量均显著降低;Mn^2+处理组可溶性蛋白含量降低33.76%,碳水化合物含量降低57.56%,海藻糖含量降低64.05%,脂质含量降低27.77%;处理组可溶性蛋白含量降低47.46%,碳水化合物含量降低59.45%,海藻糖含量降低59.16%,脂质含量降低33.71%;Mn^2+处理组总抗氧化力增加28.25%,处理组总抗氧化力增加82.54%.表明Mn^2+和Co^2+对舞毒蛾幼虫取食量、虫粪量、体质量增长量、可溶性蛋白含量、碳水化合物含量、海藻糖含量、脂质含量均有显著的抑制作用,对其总抗氧化力有显著的促进作用。[结论]舞毒蛾幼虫是主要通过提高自身抗氧化力来应对重金属的胁迫,从而提高自身对重金属的抗性。 相似文献