Long-term residual value of North Carolina and Queensland rock phosphates compared with triple superphosphate

The effectiveness of large single applications of North Carolina reactive rock phosphate, Queensland non-reactive rock phosphate, and Calciphos, were compared to the effectiveness of superphosphate in field experiments in south-western Australia for up to 11 years after application. As measured using plant yield, superphosphate was the most effective fertilizer in the year of application, and relative to freshly-applied superphosphate, the effectiveness of the superphosphate residues declined to be about 15 to 65% as effective in the year after application, and 5 to 20% as effective 9 to 10 years after application. Relative to freshly-applied superphosphate, all the rock phosphates were 10 to 30% as effective in the year of application, and the residues remained 2 to 20% as effective in the 10 years after application. The bicarbonate soil test reagent predicted a more gradual decrease in effectiveness of superphosphate of up to 70% 10 years after application. For rock phosphate, the reagent predicted effectiveness to be always lower than for superphosphate, being initially 2 to 11% as effective in the year after application, and from 10% to equally as effective 10 years later. Therefore rock phosphates are unlikely to be economic alternatives to superphosphate in the short or long term on most lateritic soils in south-western Australia.     

谈陶瓷材料对草坪灯的介入

陶瓷与自然有着天然的联系,能带给人们回归自然的审美情趣。陶瓷材料制作的灯具以其自然多变的机理、色调和形 状,比其他材料的灯具更易与景现环境融为一体。本文通过对草坪灯现状的分析,根据陶瓷材料的特点,提出陶瓷介入 草坪灯,对丰富室外环境审美客体有着积极的意义。     

基于热释电红外的草坪保护系统

目前国内城市草坪绿化面积不断扩大,但由于存在频繁践踏草坪的现象,城市草坪已经被造成了较为严重的破坏。本文介绍了一种利用热释电红外传感器设计的草坪保护系统,当有人进入草坪时将发出警告,若不听警告继续践踏草坪,系统将对人进行喷水惩罚,以此达到保护草坪的作用。文中也简要介绍热释电红外工作原理。实验证明该系统具有一定的适用性。     

保水剂对草坪土壤持水特性影响研究

为了探明保水剂对草地种植条件下土壤水分特征曲线的影响,基于王全九等开发的入渗特性法进行了土壤水平入渗试验,得出了在草坪土壤中施用不同浓度保水剂的Brooks-Corey土壤水分特征曲线。结果表明：在低吸力段,相同水势下土壤含水量随保水剂施用浓度增大而增大,在高吸力段,相同水势下土壤含水量随保水剂施用浓度增大而减小;在0~1 bar范围内,施用保水剂处理的土壤水分特征曲线均匀降低,表明施用保水剂能够稳定而有效地供给植物所需水分。本研究可以为制定城市绿地草坪合理的灌溉制度和在草坪种植中合理推广使用保水剂提供理论依据。     

不同AMF菌剂对白三叶草坪的扶壮作用

为探讨不同丛枝菌根真菌(Arbuscular Mycorrhizal Fungi,AMF)在白三叶草坪扶壮中的作用,选用摩西球囊霉、根内球囊霉两种广适菌种,分别研究单菌、混菌对白三叶草的促进作用．结果表明:单独施加摩西球囊霉对植物的侵染率最高,达53.84％;白三叶草对混菌的依赖性最强,并且植物地上器官依赖性高于地下;AMF可明显提高白三叶草坪的扶壮率,混菌效果优于单菌,株高、地上及地下生物量的扶壮率可分别增加40.7％、76.6％、35.7％;AMF可有效增强白三叶草对根际土壤中营养物质的吸收能力,水解性氮、有效磷利用率提高51.6％、48％．水解性氮是影响AMF促进白三叶生长的主要限制因子,施加菌剂时,无需补充磷肥,但可补充少量氮肥．     

多探头 K 分割编码结构及循环码编码器研究

针对增量型数字编码器提出了一种多探头Ｋ分割编码结构及与之相应的一种增量型循环码编码器的基本结构，并研究了这种Ｋ分割方式下编码状态的特征及规律，确立了一种以二进制循环码为特征标志的编码方式．尤其是这种基于Ｋ分割编码结构原理的循环码编码器，在改进码盘结构及提高编码器综合性能方面具有显著的效果．     

基于系统动力学的机场割草机需求仿真研究

为控制机场草坪高度符合机场环境安全使用要求,建立机场割草机数量配置模型。分析机场割草作业存 在的问题及影响因素,基于系统动力学理论,以机场草坪面积、割草机数量性能、机场草生长情况为基础,建立机 场割草作业过程的存量流量图和数学模型;以北方某机场草坪为背景进行实例验证。结果表明：模型运行结果与机 场割草机实际使用数量及作业情况基本吻合,可为机场管理人员配置割草机数量和安排作业时间提供理论依据和技 术支撑。     

Treatment of log yard runoff in a couch grass infiltration wetland in Sweden

Sprinkling is often used in Scandinavia to protect round wood stored for industrial use from fungal and insect attack and drying cracks. Log yard runoff can be harmful for the water recipient due to eutrophication and oxygen depletion. A wetland system for treatment of log yard runoff is being evaluated in central Sweden. The purification capacity of a sloping couch grass (Elytrigia repens L.) field was examined when log yard runoff was applied to the field through a sprinkling system. Water samples were taken from groundwater pipes during four summer seasons (May to September, 2002–2005) and analysed for total organic carbon, total phosphorus (TP), total nitrogen and distillable phenols to evaluate the purification capacity of the infiltration wetland. Results from 2002 to 2004 were compared with results from 2005 when the irrigation intensity was considerably lower. Overall, the results showed good purification capacity although the concentrations of TP in the groundwater increased during 2005. The reduced hydraulic load did not increase purification.     

草坪地排供水设施的布置及养护

介绍了草坪排供水设施的布置和养护的方法。     

三波长紫外分光光度法测定红车轴草异黄酮含量的研究

红车轴草乙醇提取液，颜色较深，背景吸收较大，以一般常用的单波长紫外分光光度法测定红车轴草异黄酮含量时，色素和醇溶性蛋白等杂质干扰严重。本文建立的三波长紫外分光光度法，能有效扣除色素和醇溶性蛋白等杂质的干扰，精密度实验的相对标准偏差为0．85％，平均加样回收率为103．95％，加样回收率的相对标准偏差为1．82％。本方法具有简便、快速、准确等特点。