高密度培养小球藻去除CO2的研究

抗逆性强、生长速率快且能高密度培养的微藻是生物法同碳的良好材料.沼液中含有小球藻生长所需的基本营养物质,但其比例及浓度并不能满足微藻高密度发酵以大量固碳的要求.文章以沼液中驯化出的抗逆性小球藻为实验藻株,以沼液为基础培养基,考察了该藻高密度培养的条件,并将其应用于CO2的去除.结果以50％沼液为基础培养基,补加氮80 ...     

Contemporary changes in open water surface area of Lake Inle, Myanmar

From 1935 to 2000, the net open water area of Inle Lake in Central Shan State, Myanmar decreased from 69.10 to 46.69 km², a loss of 32.4% during this 65-year period. Local beliefs are that losses in lake area have been even greater within the last 100–200 years. Various activities, including timber removal, shifting agriculture in the uplands by various ethnic groups, and unsustainable cultivation practices on the low- and mid-level hillslopes around the lake, have been blamed for both historical and ongoing sedimentation. We take issue with attributing loss of lake area to these activities, and propose instead that ongoing “in-lake” and “near-lake” agricultural practices are the main sources of contemporary sediment and loss of open water area. About 93% (i.e., 20.84 km²) of the recent loss in open water area of the lake is due to the development of floating garden agriculture, largely along the west side of the lake. Direct environmental impacts associated with this practice and with other agriculture activities within the wetlands and margins of the lake include sedimentation, eutrophication, and pollution. Whilst the sustainability of hillslope agriculture and past forestry practices can indeed be questioned, a more urgent need is to address these "in-lake" and "near-lake" practices.     

滇池流域典型小流域农业种植情况调查

采用资料收集、GPS定位、实地踏勘及走访式问卷调查方式,对滇池流域典型小流域柴河流域、牧羊河流域、宝象河流域的农业种植基本情况进行抽样调查,调查结果显示小流域上游到下游,农民人均耕地面积不断减少,复种指数和大棚种植比例逐渐增加;柴河流域的化肥施用强度上游高下游低,宝象河和牧羊河流域的化肥施用强度上游低、下游高。     

生态脆弱区耕地集约利用水平分析

以米脂县高西沟村为例,通过构建耕地集约利用评价指标体系,利用主成分分析方法进行分析,探讨高西沟在实施有效的水土治理措施后,耕地集约利用情况,得出结论：1997—2006年米脂县高西沟村耕地集约利用情况呈波动上升趋势,1999～2001年出现下降趋势,这与当年的自然灾害有关;高西沟村非农指数、单位化肥投入、复种指数和人均纯收入,极大地影响到耕地的集约利用水平,说明农户的经济情况影响高西沟耕地集约利用程度。     

棘胸蛙人工驯养试验

本文介绍了棘胸蛙半自然人工驯养的主要技术,并根据试验记录描绘了棘胸蛙的整个生活史     

光皮树播种育苗技术

光皮树作为重要的生物柴油树种,省林科院经过多年的研究,已选育出高产新无性系;根据实践总结了光皮树播种育苗技术,包括采种、种子处理、圃地选择、整地作床、播种与苗期管理技术等,并探讨了应用该技术后的育苗效果和育苗过程中应注意的问题．参5．     

安全工程专业实验课研究性教学与创新型人才培养

基于我国高校实验教学现况,阐述对本科专业实验课进行研究性教学改革的必要性和可行性。在论述研究性教学的特征及其在实验教学中优越性基础上,结合安全工程专业的《安全检测技术》实验课的教学改革实践,提出从实验指导书、实验教学大纲、教学方案和考核方式等方面进行全面改革,探讨专业实验课研究性教学中实验设计、实施过程以及对实验环境的要求与改革,提出大力加强开展综合性、设计性及研究创新性实验,并将专业实验课教学与教师科研课题进行有效结合。教改实践表明,在专业实验课中实施研究性教学,有利于实现教学相长、教学与科研相融、人才培养链相接,对培养安全工程创新型人才具有重要意义。     

日本野漆树在红壤侵蚀区的栽培管理

介绍了日本野漆树的生长习性、栽培历史及现状,并针对红壤侵蚀区的生态环境特点,分析和探讨了其适宜的栽培与管理技术及综合利用价值。     

Mechanisms to exclude local people from forests: Shifting power relations in forest transitions

Forest transitions may significantly contribute to climate change mitigation but also change forest use, affecting the local people benefiting from forests. We analyze forest transitions as contested processes that simplify multifunctional landscapes and alter local livelihoods. Drawing on the Theory of Access, we develop a conceptual framework to investigate practices of multifunctional forest use and the mechanisms that exclude local forest use(r)s during forest transitions in nineteenth century Austria and twenty-first century Lao PDR. Based on historical sources, interviews and secondary literature, we discuss legal, structural and social-metabolic mechanisms to exclude multifunctional forest practices, marginalizing peasants and shifting cultivators. These include, for example, the increasing enforcement of private ownership in forests or the shift from fuelwood to coal in Austria and restrictive land use planning or the expansion of private land concessions in Laos. By integrating political ecology and environmental history in forest transitions research we unravel shifting power relations connected to forest change.     

亚硝化细菌的筛选及培养条件的研究

从活性污泥中分离出16株亚硝化细菌,筛选出亚硝酸盐氮积累速率较高的两株菌Y8和Y16,初步鉴定Y8菌株为亚硝化球菌（Nitrosococcns．sp）,Y16菌株为亚硝化单胞菌（Nitrosomonas.sp）,并对其生长曲线进行了测定。通过氨氮去除率或业硝酸盐氮的质量浓度来验证亚硝化细菌的活性,考察了生成的亚硝酸盐氮的质量浓度与培养时间的关系、亚硝化细菌的活性与培养温度的关系、亚硝化细菌的活性与培养基pH的关系。Y8和Y16菌株在30℃、培养基pH为7．5、130r／min的条件下振荡培养5d,氨氮去除率分别为81．12％,75．36％。