Ecotourism Model and Benefits of Periphery Regions in Westem Sichuan Province

There are many problems in the minority regions of western Sichuan Province, such as serious soil erosion, fragile ecological environment, low levels of economy and so on. Advantages of tourism resources in the ＂periphery regions＂ should be fully utilized, and ＂multi-tourism＂ meets the characteristics and present situation of the minority regions. The ＂multi-tourism development model＂ can exert the functions of tourism as the key industry. Based on the demands and the internal linkages among different industries, the model can accelerate the development of related-industries, such as eco-agriculture, eco-industry and so on. Through implementing the multi-tourism model, we can fully utilize the advantages of the periphery regions and promote the sustainable development of regional economy.     

工业生态系统类型及稳定性的相关性探讨

在分析了工业生态系统及其稳定性涵义的基础上，结合实例把工业生态系统分为3种类型：星式工业生态系统、放射式工业生态系统和点式工业生态系统，从多方面探讨了各种类型工业生态系统的特征，并分析了工业生态系统类型与稳定的相关性，有针对性地提出提高各类型工业生态系统稳定性的对策。     

污染河流底质中铅的解吸规律研究

通过对云南省马关县矿区河流中重金属铅在不同转速和不同静止时间的测定和分析，结果表明，河流流速越快，底质中的铅向水中释放量越多，而且在河流越平稳地段，重金属铅在底泥中沉积量就越多。     

Trace Metal Voltammetric Determination of Otoliths of Tench Tinca Tinca (L.): Its Possible Uses in Monitoring the Quality of Fresh Waters

New data of heavy metals in otoliths of fresh water teleosts are reported. Differential pulse anodic stripping voltammetry (DPASV) has been used for determining copper, lead, cadmium and zinc in otoliths of tench, Tinca tinca (L.). the analytical procedure followed gives data of good repeatability and with low detection limits, in a simple and inexpensive way. Tench of age ranging from 3 to 8 years were examined. Four year old fish had maximum concentrations of heavy metals, and an otolith weight adequate for experimental determinations in bulked samples. Fresh water teleosts are less mobile than marine ones, and could be used for monitoring the quality of waters suspected for pollution, and eventually verifying the influence of the environmental variations on the metal bioaccumulation.     

A sustainable extension package for rural and urban communities: An undertaking in western Sri Lanka

The biggest challenge of agricultural extension in urban communities is how to reach the appropriate target group, because the majority of people are engaged in agricultural production as well as homestead development in a part-time or restricted-time basis, and have different interests. Therefore, an agricultural extension research package, initiated in late 1990, is being tested, with special reference to the horticultural interests of the population in the Western Province. It has three modules: first, dealing with rehabilitation of already existing fruit trees (rambutan, mango) for long-term economic benefits; second, strengthening the income-generating activities at the homestead level, namely leafy vegetable cultivation, value-added products from fruits and vegetables, cultivation of vegetables in pots and hanging baskets, in situ budding, and post-harvest management techniques in fruits, vegetables and flowers; third, the improvement of soil fertility and waste management—particularly soil conservation, compost making, and landscaping techniques. The package integrates traditional and modern extension methods, and at present is still undergoing the implementation process (currently 15% complete). Moreover, it includes a mechanism enabling the mixing of indigenous knowledge and exogenous knowledge by viewing the target group as the subject of the extension process.     

PKS控制系统在锅炉烟气脱硝处理中的应用

Honeywell PKS控制系统应用于循环流化床锅炉脱硝处理,可实现工艺数据的集中显示和工艺指标的集散控制,特别是在关键设备如稀释风机的互备联锁控制、氨流量的自动调节、吹灰器的顺序控制等方面,利用PKS系统丰富的功能块,实现了控制策略的组态和优化,保证了生产安全稳定运行。     

器具开关寿命检测中电流波形失真的分析与研究

本文针对器具开关寿命检测试验中的负载设计方式,特别是使用铁芯电感代替理想空心电感构成试验电路时引起电流失真的情况进行研究,首先对各类常见家用电器的实际波形失真特征量进行测试,得到试验可接受的统计范围,在此基础上,与不同铁芯电感模拟家用电器作负载的电流失真情况进行对比和分析,首次对检测电路的负载制作规范提出合理化建议,完善器具开关质量检测相关的标准化体系。     

砷污染生境下挺水植物香蒲对砷的积累与迁移特性

为探究典型湿地挺水植物香蒲（Typha angustifolia L.）不同生长阶段对As（砷）污染生境中As累积与迁移的影响,采用室内模拟方式,通过外源添加Na₂HAsO₄·7H₂O设置不同的As污染生境,w[As（V）]分别为0、50、100、150、200、400 mg/kg,探析As胁迫下不同物候期（幼苗期、花果期、枯黄期）香蒲的生长发育、As累积特征及对土壤中As的提取迁移效果.结果表明:①As对挺水植物香蒲的生长产生低促高抑的作用,在w[As（Ⅴ）]为100~150 mg/kg处理下香蒲的生长状态显著优于其他处理;在w[As（Ⅴ）]为400 mg/kg污染生境下,香蒲的生长存在受害症状,但仍可完成整个生命期.不同生长阶段香蒲对As的耐受性特征存在差异,随着生育期的延长,植株对As污染反应的敏感性下降,表现出较强的耐受性,其中花果期最为突出,在w[As（Ⅴ）]为100 mg/kg时耐性指数最大,比0 mg/kg处理增加了54.0%.②香蒲不同部位对As的积累特征均反映出剂量依赖效应,在幼苗期、花果期和枯黄期香蒲地上部w（As）均低于地下部,转运系数均小于1;但不同生长阶段植株富集转运水平差别较大,以花果期为最高,幼苗期次之,伴随"稀释"效应的产生,枯黄期最低.③在As污染生境下,香蒲对土壤中As的去除作用大于固定作用,其迁移效果表现为花果期>枯黄期>幼苗期,在花果期进行刈割可使其发挥最佳修复效果.研究显示,挺水植物香蒲对As具有较强的耐性,并且对As的积累与迁移在不同物候期存在差异,因此,其可作为修复As污染河湖湿地土壤的推荐性植物加以深入研究与利用.      

基于GGE双标图和纤维长度选择的长江流域棉花区域试验环境评价

采用GGE双标图方法对2000~2010年期间27个独立的长江流域棉花品种区域试验的安庆、南阳、黄冈、荆州、武汉、襄阳、常德、岳阳、南京、南通、盐城、九江、简阳、射洪和慈溪等15个试验环境（试验点）在棉纤维长度选择上的鉴别力、代表性、理想指数和离优度指数进行了全面分析和综合评价。对各试验环境基于纤维长度选择的综合评价表明,荆州、九江、安庆和常德是最理想的试验环境,对以长江流域为目标环境的广适性新品种选育和作为区域试验环境鉴别理想新品种的效率最高,而江苏和浙江省沿海棉区的试验环境（南通、盐城和慈溪）和四川盆地棉区试验环境（简阳和射洪）不适宜作为针对长江流域的纤维长度选择与推荐环境,从而展示了GGE双标图在棉花区域试验环境评价方面的应用效果,也为长江流域国家棉花区域试验方案的决策提供理论依据     

耕作方式对太湖地区冬小麦生长季N2O排放的影响

采用静态暗箱-气相色谱法对2009年11月至2010年6月冬小麦(Triticum aestivum L.)生长季N2O排放通量进行田间原位观测,研究不同耕作方式(免耕、少耕、传统耕作)对太湖地区稻麦轮作系统麦季土壤N2O排放的影响。结果表明:有植株参与下免耕、少耕和传统耕作的冬小麦生长季N2O平均排放通量分别为63.75μg·m-2·h-1、39.94μg·m-2.h-1和48.83μg·m-2·h-1,无植株参与下分别为73.48μg·m-2·h-1、52.97μg·m-2·h-1和63.60μg·m-2·h-1,麦季N2O排放通量的季节变化与5 cm、10 cm土壤温度呈显著或极显著线性正相关(r=0.400*～0.654**,n=28)。小麦种植对N2O的排放影响较大,无植株参与的N2O季节总排放量显著高于有植株参与的处理(P<0.05);耕作方式显著影响冬小麦农田N2O季节总排放量(P<0.05),有植株参与下麦季N2O总排放量少耕较免耕和传统耕作分别减少37.3%和17.9%,无植株参与下分别减少28.0%和16.7%。研究表明太湖地区冬小麦采用少耕措施可减少麦季N2O的排放。