居住区植物造景初探   总被引：2，自引：2，他引：2  

艾友明 《福建林业科技》2005,32(2):176-179

居住区是居民最直接的生活空间,居住区环境的好坏直接关系到居民的生活质量,其环境的建设应以改善和维护小区生态平衡为宗旨,以人与自然和谐为目标。通过分析国外居住区植物造景动态和国内居住区植物造景现状,提出了居住区植物造景发展趋势。  相似文献   

新疆早实核桃集约栽培模式的研究     

王国安  崔卫国  艾力  田宝远  杨俊杰  吴清芳 《经济林研究》2002,20(4):27-30

本文基于新疆早实核桃集约栽培研究的 8年试验结果 :定植 (嫁接 )后第 8年平均株产核桃 9.67kg(最高株产达 2 0 .0 2kg) ,平均每 hm2产核桃 410 5 .3 5 kg(最高 hm2产核桃 5 5 2 2 .2 5 kg,660株 / hm2 ) ,间种产值 5 90 0 .5 5元 ,产值效益达 4695 4.0 5元 ;8年间平均每 hm2年产核桃 1115 .78kg,间种产值 9842 .85元 ,产值效益达 2 10 0 0 .6元。提出了适宜早实核桃集约栽培的品种、品种搭配、栽植密度 ,前期间作方式、间种作物 ,施肥浇水 ,幼树整形修剪及病虫害防治等一整套树体和田间管理技术措施 ,对新疆乃至全国早实核桃生产具有一定指导作用  相似文献   

添加水对半干旱区沙质草地土壤氮有效性季节变化的影响(英文)     

黄晓星  于占源  钱伟  徐大勇  艾桂艳 《林业研究》2007,18(4)

Water is usally thought of a limiting factor for the restoration of semi-arid ecosystem. In the growing season of 2006, a study was conducted to determine the effects of modeling precipitation on seasonal patterns in concentrations of soil-available nitrogen and to describe the seasonal patterns in soil nitrogen availability and seasonal variation in the rates of net nitrogen mineralization of topsoil at Daqinggou ecological station in Keerqin sand lands, Inner Mongolia Autonomous Region, China. Manipulation of water (80 mm) was designed to be added to experiment plots of sandy grasslands in dry season. Water addition (W) treatment and control (CK) treatment were separately taken in six replications and randomly assigned in 12 plots (4 m×4 m for each) with 2-m buffers betweens. Results showed that the content of soil inorganic nitrogen and net nitrogen mineralization rate were not affected by adding water in sandy grassland of Keerqin sand lands. Net nitrogen mineralization rates ranged from 0.5 μg·g-1·month-1 to 4 μg·g-1·month-1. The highest values of soil inorganic nitrogen and net nitrogen mineralization occurred on October 15 in control plots. The seasonal changes of soil inorganic nitrogen contents exhibited "V" shape pattern that was related to seasonal patterns of soil ammonium-N (ascending trend) and nitrate-N transformation (descending trend).  相似文献   

Treatment of timber products with gaseous borate esters     

P. Turner  R. J. Murphy 《Wood Science and Technology》1995,29(5):385-395

Summary Several factors which influence the treatment of timber products with vapour phase preservatives such as borate esters are considered. Gas flow rate through the substrate was found to be a significant factor limiting both preservative penetration and its rate of deposition. A theoretical model of the treatment process was developed and tested experimentally to determine the influence of several factors on the retention and distribution of boric acid. Gas flow into the timber product was influenced by permeability, pressure gradient and substrate moisture content. The implications of the findings are considered with regard to the treatment of wood and wood products with gaseous reagents.The authors wish to thank the following for their financial support and interest in this research programme — Rentokil Ltd, Rhone-Poulenc/Manchem Ltd, Forestry Commission, UK and Ireland Particleboard Association (now Panel Products Association), Norbord Highland plc (formerly Highland Forest Products plc), IMPEL  相似文献   

浅谈陕北优势杂果资源及开发利用   总被引：4，自引：0，他引：4  

贺学林  桑大席  艾海舰  蔡小花 《陕西林业科技》2005,(3):66-68

陕北杂果资源丰富,特色鲜明,市场前景广阔.本文介绍了陕北主要优势杂果的资源分布、生产现状以及存在问题,提出了陕北优势杂果资源的开发利用途径.  相似文献   

The effect of short day treatments on containerized Douglas-fir morphology,physiology and phenology     

Turner  Jennifer  Mitchell  Stephen J. 《New Forests》2003,26(3):279-295

The effect of short day treatments (blackout) on Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) container seedlings at the time of lift and following cold storage was investigated. Variables measured included height, root collar diameter (RCD), root growth capacity (RGC), photosynthetic efficiency after –18 °C freezing (PEF), and days to terminal bud break (DBB). From one to four blackout dormancy induction treatments were started on three dates (July 12, July 26, and August 10) with 10 or 20 d between multiple blackouts. Increasing the number of blackout treatments resulted in lower RCD, lower DBB in the late winter/early spring, and higher PEF in the early fall. Later blackout start dates decreased PEF in the early fall, and increased overall height and late fall RGC as compared to earlier blackout start dates. Nurseries growing Douglas-fir seedlings from coastal Pacific Northwest provenances should be aware that blackout regimes can decrease RGC in the late fall, and cause quicker dormancy release in the early spring. Coastal Douglas-fir can be lifted and planted in the early fall, when RGC and DBB are relatively high. If planting between February and April is necessary, seedlings given blackout should be cold stored in January to maintain an adequate level of dormancy, RGC and PEF.  相似文献   

"三岩"造林困难地植被恢复技术研究与示范     

李昌珠  艾文胜  张康民  肖斌  张玉石  彭友光  郭照光 《湖南林业科技》2001,28(3)

湖南造林困难地类总面积达 10 0万hm2 。通过对 5个县 658hm2 试验示范林历时 9年的研究 ,解决了植被恢复技术问题。选出适宜的树、划种有马桑、芦竹、苦槠、牡荆和栓皮栎 5种 ,有发展前景的树种有柏木、铅笔柏和藏柏。选出了林分结构稳定 ,组成种长势好 ,可以肯定的有马桑十墨西哥柏浅层钙质幼年性岩性土等 6个配置模式。并提出和推广了撩壕整地和芦竹下挖上堆 ,施肥促长等造林技术。同时 ,定义了“三岩”造林困难地 ,提出了“三岩”造林困难地的生态环境特点。从土种的水平研究了树种与立地的适应性。  相似文献   

对改进和完善常规木材干燥室设施的探讨     

艾沐野  李莉  闫佳玉  黄聪  战剑锋 《林业机械与木工设备》2015,(2)

分析了我国当前木材干燥生产中常规干燥室存在的问题,探讨了干燥室的改进措施,提出了合理建议和意见。  相似文献   

不同盐度、碱度、pH值对瓦氏雅罗鱼精子活力及其受精率的影响     

李乾  梁利群  艾克达·热合曼  孙博  张立民  董志国  常玉梅 《华北农学报》2021,36(z1):381-389

为了掌握瓦氏雅罗鱼精子活力及其受精率的最适盐度、碱度和pH的范围,通过设置不同NaCl盐度(1‰,2‰,3‰,4‰,5‰,6‰,7‰,8‰)、NaHCO3碱度(10,20,30,40,50,60,70 mmol/L)、pH值(5.0,5.5,6.0,6.5,7.0,7.5,8.0)梯度范围的溶液及淡水对照组(盐度0、碱度0、pH值6.67)激发达里诺尔湖瓦氏雅罗鱼精子活力,观察了不同处理组精子状态,并对其激烈运动时间、快速运动时间及寿命进行了测定,同时测定了受精卵在不同盐度、碱度和pH溶液中的受精率.结果表明:盐度在0～4‰,瓦氏雅罗鱼精子激烈运动、快速运动时间及寿命呈逐渐上升趋势,4‰达到最长;碱度在0～50 mmol/L,精子激烈运动、快速运动时间及寿命随碱度增加而延长,50 mmol/L达到最大;pH值5.0～7.0,精子激烈运动、快速运动时间及寿命随pH值的升高而延长,pH值7.0达到最大;受精率分别在盐度4‰、碱度30 mmol/L、pH值6.5达到最高,不同盐度和碱度组的受精率显著低于淡水对照组.综上,基于对不同盐度、碱度和pH值对瓦氏雅罗鱼精子活力及其受精率的分析结果,建议在开展瓦氏雅罗鱼全人工繁殖及杂交育种过程中,尽量选择盐度在0～4‰,碱度为0～30 mmol/L,pH值6.0～7.0的盐碱水体或淡水中进行,可以获得较高的受精率及苗种成活率.  相似文献   

基于水肥一体化条件下化肥减量对春小麦的影响     

罗静静  李怀胜  王贺亚  艾海峰  王斌  张磊 《新疆农业科学》2022,59(11):2614-2620

【目的】研究水肥一体化条件下化肥减量对春小麦的影响,为新疆塔额盆地春小麦化肥减量提供理论基础。【方法】以春小麦品种宁春16号为材料,设置5个处理,其中1个空白对照A(N₀P₀K₀)1个农户处理E(N₂₄₀P₁₀₅K_37.5)和3个对氮肥、磷肥的减量处理B(N₁₂₀P_52.5K_37.5)、C(N₁₂₀P₁₀₅K_37.5)、D(N₂₄₀P_52.5K_37.5)的田间试验,对照处理为A、农户E处理,分析在水肥一体化条件下的不同化肥减量对春小麦农艺性状、叶面积指数、产量构成、干物质积累与转运、农学效率的影响。【结果】处理C施肥量下,在开花期LAI达到7.14,显著高于对照A、E处理,花前转运量、转运率及物质转运对籽粒的贡献率在C处理达到最高,花后干物质积累量对产量的贡献率达到75.29％。处理C比其它处理提高了5％~24％;氮肥减少50％、磷肥不变C处理时产量达到最高为7 964.84 kg/hm²,较对照显著提高,比其他减肥模式产量提高了4.52％~24.09％。【结论】小麦处理C模式下表现最优,在小麦生产过程中合理的减量施氮可以获得高产;C(N₁₂₀P₁₀₅K_37.5)处理的化肥减量模式更适合新疆种植春小麦。  相似文献