混合改良剂钝化修复酸性多金属污染土壤的效应——基于重金属形态和植物有效性的评价

通过盆栽试验研究了4种由不同剂量的沸石、石灰石、无机磷、有机肥(猪粪或蘑菇渣)组配的混合改良剂对广东省韶关市大宝山周边酸性多金属污染土壤的改良效果。结果表明,4种有机-无机混合改良剂处理后,土壤pH值增加了0.52~1.76个单位,土壤中Pb、Cu、Zn的有效态含量分别比对照土壤降低70.92%~99.29%、69.47%~98.45%、67.22%~99.17%,而且土壤pH值和重金属Pb、Cu、Zn的有效态含量呈显著负相关性。在对照土壤上,菜心和油麦菜的种子发芽和生长显著受到抑制,植株地上部Pb、Cu、Zn含量均高于食品卫生标准。土壤经混合改良剂处理后,菜心和油麦菜生长健康,株高和地上部的生物量显著增加,地上部Pb、Cu、Zn含量显著降低。重金属的化学形态分析结果显示,改良后土壤中的Pb、Cu、Zn可交换态含量明显降低,铁锰氧化物结合态含量提高。因此,4种有机-无机混合改良剂通过提高土壤pH值和促进土壤中Pb、Cu、Zn由可交换态向铁锰氧化物结合态转换,从而达到钝化修复该酸性多金属污染土壤的效果。     

石灰石粒取代产蛋鸡饲粮中2／3石粉对蛋壳品质的影响

现代化养鸡业因蛋壳品质不良损失的蛋约为6%—8%,使企业蒙受很大的经济损失。营养是影响蛋壳品质的主要因素。产蛋鸡饲粮中含足够的钙、维生素D 及适量的磷、镁、锰、氯等元素,是形成优质蛋壳的基本条件。试验已揭示,母鸡主要在夜间形成蛋壳,因而下午4时前苛求钙质;上午10时和下午4时投服的钙,分别从蛋壳回收51%和     

天然饲用矿物在肉仔鸡饲养中的应用研究

将沸石,膨润土、石灰石等按一定比例混合制成RF,RB,RFB三种矿物添加剂,对艾维茵肉仔鸡进行饲养试验,结果各试验鸡组较之对照组,体重增加2％—5％,饲料转化比降低0.44％—6.11％,差异均接近5％显著水准。试验鸡各处理在产肉性能上无显著差异(P>0.05)。使用RFB型天然矿物添加剂,每只肉仔鸡可增加收入0.55元。     

谷城的奇石资源

湖北谷城地区地质构造复杂，成矿条件优越。经地质普查勘探，有矿藏30多种，其中非金属矿藏有重晶石，石灰石，石棉，石膏，硅石，白云石，石英石，大理石，花岗石，水晶石，蛇纹石等；金属矿藏有铜，铁，金，猛，铝，锌，钼，锗等。丰富的矿藏为我们谷城奇石爱好寻找开放奇石资源奠定了丰厚的物质基础。     

我国矿山废弃地受损生态环境的恢复探讨——以唐山石灰石矿为例

指出了矿山开采对我国的环境带来了巨大的影响,介绍了目前矿山环境的基本现状,探讨了有关矿山修复及恢复的技术,并有针对性地提出了矿山治理的对策与建议,以实例——唐山的石灰石矿探讨了具体的恢复措施及对策,对于矿业生产中一些受到环境损坏的生态恢复具有一定的借鉴意义。     

施用生物肥料，镁石灰石，玄武岩可改善马来西亚酸性硫酸盐土壤化学性质与水稻生长状况

Acid sulfate soils are normally not suitable for crop production unless they are appropriately ameliorated. An experiment was conducted in a glasshouse to enhance the growth of rice, variety MR219, planted on an acid sulfate soil using various soil amendments.The soil was collected from Semerak, Kelantan, Malaysia. Ground magnesium limestone（GML）, bio-fertilizer, and basalt（each 4t ha^-1） were added either alone or in combinations into the soil in pots 15 d before transplanting. Nitrogen, P and potash were applied at 150, 30, and 60 kg ha^-1, respectively. Three seven-day-old rice seedlings were transplanted into each pot. The soil had a p H of 3.8 and contained organic C of 21 g kg^-1, N of 1.2 g kg^-1, available P of 192 mg kg^-1, exchangeable K of 0.05 cmolc kg^-1,and exchangeable Al of 4.30 cmol c kg^-1, with low amounts of exchangeable Ca and Mg（0.60 and 0.70 cmol c kg^-1）. Bio-fertilizer treatment in combination with GML resulted in the highest p H of 5.4. The presence of high Al or Fe concentrations in the control soil without amendment severely affected the growth of rice. At 60 d of growth, higher plant heights, tiller numbers and leaf chlorophyll contents were obtained when the bio-fertilizer was applied individually or in combination with GML compared to the control. The presence of beneficial bacteria in bio-fertilizer might produce phytohormones and organic acids that could enhance plant growth and subsequently increase nutrient uptake by rice. Hence, it can be concluded that addition of bio-fertilizer and GML improved rice growth by increasing soil pH which consequently eliminated Al and/or Fe toxicity prevalent in the acid sulfate soil.     

蛋鸡可用的钙源饲料

1)蛋壳粉。蛋壳经烘干后制成蛋壳粉可作为钙源饲料,其中会含有一些有机质,一般含粗蛋白可达12.4%、含钙24.5%~26.5%,但在使用时要特别注意防止蛋壳污染。2)石粉。石粉即石灰石粉,为天然碳酸钙。一般含纯钙38%左右,是蛋鸡补充钙质最廉价的矿物饲料,其他较纯的商品碳酸钙、旧石灰也与石粉有相同的作用。