佛山市文华公园总体规划

佛山市文华公园是佛山市禅城区中心组团城市景观轴线的重要节点。整个公园采取开放式设计,力图建设成为一个高品质的具有浓郁岭南文化意蕴的“城市绿色客厅”。     

Tree and crop productivity in gliricidia/maize/pigeonpea cropping systems in southern Malawi

This study examined the hypothesis that incorporation of Gliricidia sepium (Jacq.) Walp.) (gliricidia), a fast-growing, nitrogen-fixing tree, into agroforestry systems in southern Malawi may be used to increase the input of organic fertilizer and reduce the need for expensive inorganic fertilizers. The productivity of maize (Zea mays L.), pigeonpea (Cajanus cajan L.) and gliricidia grown as sole stands or in mixed cropping systems was examined at Makoka Research Station (latitude 15° 30′ S, longitude 35° 15′ E) and a nearby farm site at Nazombe between 1996 and 2000. Treatments included gliricidia intercropped with maize, with or without pigeonpea, and sole stands of gliricidia, maize and pigeonpea. Trees in the agroforestry systems were pruned before and during the cropping season to provide green leaf manure. Maize yields and biomass production by each component were determined and fractional light interception was measured during the reproductive stage of maize. Substantial quantities of green leaf manure (2.4 to 9.0 Mg ha⁻¹ year⁻¹) were produced from the second or third year after tree establishment. Green leaf manure and fuelwood production were greatest when gliricidia was grown as unpruned sole woodlots (c. 8.0 and 22 Mg ha⁻¹ year⁻¹ respectively). Improvements in maize yield in the tree-based systems also became significant in the third year, when c. 3.0 Mg ha⁻¹ of grain was obtained. Tree-based cropping systems were most productive and exhibited greater fractional light interception (c. 0.6 to 0.7) than cropping systems without trees (0.1 to 0.4). No beneficial influence of pigeonpea on maize performance was apparent either in the presence or absence of gliricidia at either site in most seasons. However, as unpruned gliricidia provided the greatest interception of incident solar radiation (>0.9), coppicing may be required to reduce shading when gliricidia is grown together with maize. As pigeonpea production was unaffected by the presence of gliricidia, agroforestry systems containing gliricidia might be used to replace traditional maize + pigeonpea systems in southern Malawi. This revised version was published online in June 2006 with corrections to the Cover Date.     

水基二异氰酸酯交联聚乙烯醇环保新型木材粘合剂

以水基中甲苯二异氰酸酯（TDI）交联改性聚乙烯醇（PVA）的反应原理为理论依据，以交联反应后粘胶体系中游离TDI量的检测结果及其颜色的稳定性，说明在20～35℃的常温和催化剂的作用下，少量TDI关联PVA胶水，可以合成出性能优良的绿色粘合剂，采用正交实验法，探讨在水基中反应物料的组成，交联反应的温度，交联反应进行的时间等因素对TDI交联PVA粘胶体系的环保性能和粘结性能的影响。     

师法自然的植物造景——广州“绿色亚运”增绿行动计划树种选择及模式应用分析

通过分析广州"绿色亚运"增绿行动计划建设的主要类型、工程特点、树种选择和应用的基本原则,初步总结了依据地带性规律"师法自然、让自然做功,模拟近自然群落"的植物造景理念是广州"绿色亚运"增绿行动计划植物配置的核心,为广州及珠三角地区类似工程的树种选择及应用提供了借鉴。     

湖南湘潭矿业废弃地土壤特性研究

对湖南湘潭锰矿废弃地的土壤基质特殊性和少量自然定居植物营养元素和重金属元素含量进行研究.结果表明:尾矿废弃地土壤以砂粉土为主,通气透水性能差,渗透系数小,易造成地面积水;矿渣废弃地渗透系数大,蓄水量少而蒸发失水强,抗旱力弱.2类废弃地土壤营养元素含量低,重金属元素锰、铜的含量高,毒害大.在自然定居的少量植物中,商陆和荩草为超积累植物.采用植物生物原位修复法改善极端生境条件,既经济又高效.     

生态养老背景下木结构建筑发展探析

木结构建筑具有自然舒适、绿色环保、节能保温以及防震减灾等特点,在生态养老领域具有很好的发展前景。介绍了木结构建筑概况,分析了老年人的生态养老需求,从适老化、绿色智能和文旅康养等方面,对木结构老年建筑发展进行展望与讨论,提出了完善相关标准规范和政策建议,为促进我国木结构老年建筑发展提供参考。     

荒漠化土地土壤有机质含量的实测光谱估测

在对2个荒漠化典型区土壤采样、化验分析和光谱测量的基础上,分析荒漠化土地土壤的反射光谱特征及土壤有机质的光谱敏感范围,构建多种土壤有机质含量高光谱估测模型。结果表明:荒漠化土地土壤具独特的波浪型光谱曲线,其主要特点是在可见光和近红外的500～900nm光谱范围存在一个明显的弓形突起区,其对提取土壤有机质信息有实际意义;相关分析发现,在中心波长分别为600和830nm的可见光和近红外光光谱范围分别存在1个有机质光谱敏感区;土壤有机质含量高光谱估测模型验证结果表明,利用波长588nm处的反射光谱对数lgR588和反射光谱倒数1/R588以及波长835nm处的反射光谱倒数的导数(1/R835)'和反射光谱对数的导数(lgR835)'分别建立的模型,可以较好地估测荒漠化土地土壤有机质含量。     

基于城市生态安全的防护林体系建设探讨——以广州“绿色亚运”增绿行动计划防护林建设为例

城市防护林建设是城市安全重要内容,建设好城市防护林对城市可持续发展有着重要意义.广州“绿色亚运”增绿行动防护林建设是系统论、景观生态学理论的融合,是践行建设生态高效、景观优美、城乡一体、以人为本的宜居城市防护林体系.文章在对广州防护林现状分析的基础上,从沿海防护林、工业园防护林、农田林网三大建设工程方面对广州“绿色亚运...     

绿肥还田对烟田土壤培肥和烤烟产量品质的作用

2006～2007年连续两年采用烤烟-绿肥轮作田间试验与室内分析方法,研究绿肥还田对土壤培肥和烤烟产量、品质的作用,取得良好效果。绿肥还田明显提高土壤有效磷钾养分含量。土壤速效磷以油菜区黑麦草区CK;土壤速效钾以黑麦草区油菜区CK。绿肥还田显著提高烟叶产量,改善烟叶品质。黑麦草区、油菜区分别比对照烟叶增产13.7%、16.4%,上、中等烟叶比例达90%以上。     

Changes in soil nitrogen availability due to stand development and management practices on semi‐arid sandy lands,in northern China

Soil nitrogen (N) availability is one of the limiting factors for plant growth on sandy lands. Little is known about impacts of afforestation on soil N availability and its components in southeastern Keerqin sandy lands, China. In this study, we measured N transformation under sandy Mongolian pine (Pinus sylvestris var. mongolica Litv.) plantations of different ages (grassland, young, middle‐aged, close‐to‐mature) and management practices (non‐grazing and free‐grazing) during the growing seasons using the ion exchange resin bag method. Results showed that, for all plots and growing season, soil NH‐N, NO‐N, mineral N, and relative nitrification index, varied from 0·18 to 1·54, 0·96 to 22·05, 1·23 to 23·58 µg d⁻¹ g⁻¹ dry resin, and 0·76 to 0·97, respectively, and NO‐N dominated the available N amount due to intense nitrification in these ecosystems. In general, the four indices significantly increased in the oldest plantation, with corresponding values in non‐grazing sites lower than those in free‐grazing sites (p < 0·05). Our studies indicated that it is a slow, extended process to achieve improvement in soil quality after afforestation of Mongolian pine in the study area. Copyright © 2009 John Wiley & Sons, Ltd.