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1.
应用林木球果采集机可以在基本不损伤母树的前提下，进行大面积机械化采集林木球果。对森林生态保护，森林更新、减轻工人劳动强度，保 证人工安全，提高采种效率等方面都有重要意义。 相似文献
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BasicstructureoftherobotThebasicstructureoftherobotincIudesthreeparts'pickingmanipuIator,runningpart(crawIertractor),computernumericalcontroIsystem.TheshapeofthemanipulatoroftherobotwasshowninFig.1.ThemanipuIatorhastWo6-mlongarms.onthetopoftheforearm,therearetWotooth-likepickingcombs,O.5minwidthando.85minlength,madeof6oSi2MnsteelandweredrivenbythehydrauIicsystem.Thecombscanswayleftandright,turnupanddown,andcanopenandcloseliketooth.Fig.1.GeneralstruCtureoftherobot1.Machineffamei2.Rotaryd… 相似文献
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不同栽培模式和基质对马兰产量的影响 总被引：3，自引：0，他引：3
对马兰进行不同栽培模式和基质的对比试验,结果表明,不同的栽培模式和栽培基质对马兰的采收时间、产量、品质、经济效益都会产生显著影响.全年保护地栽培比露地栽培多采收1～2次、平均每次采收时间缩短2～7d;保护地栽培年均产量达9.12 kg/m2,比露地栽培的年均产量5.09 kg/m2高出79%;试验中以鸡粪 废菌棒为基质的产量最高,其年均产量为8.63 kg/m2,分别比单独以鸡粪、废菌棒为基质以及对照平均高出18%、23%、58%,且保护地栽培的马兰茎叶嫩、鲜、绿、涩味轻、可食率高. 相似文献
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管道内径在线检测机器人的结构设计 总被引：2，自引：0，他引：2
针对现有接触式管道内径测量机器人对长距离管道内径进行连续测量的不足，对一种非接触式管道内径在线检测机器人的机械结构进行了设计与研究。分析了机器人的越障能力及弯道处可能产生的运动干涉问题，进行了三维建模与运动仿真，验证了该机器人在管道内运动的稳定性、管道变径的自适应性及障碍与弯道的通过性。该机器人的最大优点是本体可以实现无缆、无自备动力源、利用无压重力水流驱动，实现对管道内径进行长距离在线测量。 相似文献
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2002—2006年在普文试验林场进行了云南拟单木兰（Parakmeria yunnanensis）的引种栽培试验。详细介绍了该树种从种子采集、处理、贮藏、播种、苗期管理、栽培技术等一系列的培育技术。结果为5年生苗高平均5．27m，地径9．72cm。认为可以在云南南部热区进行推广种植。 相似文献
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确定了套索驱动空心杆机器人传动系统,并用SolidWorks三维绘图软件对机器人进行结构设计,采用D-H法建立位姿矩阵,对该机器人进行运动学分析,并给出控制方案。该机器人结构简单轻便,可用于大型结构、设备的检测清理、灾后废墟中的搜救等需要在狭小空间内作业的场合。 相似文献
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为了阐明华北落叶松人工林不同林隙大小对更新的影响规律,对木兰围场低效华北落叶松人工林林隙内苗木更新特性进行了研究。结果表明:林隙内更新苗的主要种类有华北落叶松、山杨和油松。华北落叶松和山杨的密度在林隙面积为120~140m2时最大,达到2 411株/hm2;而油松的密度在林隙面积为20~40m2时最大,为196株/hm2。随着林隙面积的增大,华北落叶松和山杨大径级和大高度级更新幼苗数量基本呈现增加的趋势,在林隙面积达到160~180m2时达到最大值;而油松在40~60m2时达到最大,径级大于2cm的更新苗密度为69株/hm2。 相似文献
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森林作业机器人研究动态 总被引：5，自引：5，他引：0
研发和利用森林作业机器人对于提高森林作业的质量与效率、促进经济增长具有重要意义。文中基于森林作业应用领域,提出森林作业机器人的分类方法;从采运、培育方面详细论述了国内外采运机器人、种苗机器人、整枝机器人、嫁接机器人、林用清理机器人和消防机器人的研究动态;依据近50年森林作业机器人的发展历史,提出未来森林作业机器人的关键技术与发展方向应集中在多足移动机构、多机械手协调作业、多传感器信息融合、新机器人等方面。 相似文献
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通过访谈、查阅文献资料与实地调查,对云南省腾冲县古银杏资源的分布、数量及结构特征进行分析。结果显示,腾冲县共有古银杏3000余株,分布在界头乡和固东镇;其中107株古银杏有生长指标,雌株占94.34％;树高最大为30.0 m,最小为9.5 m;树龄最长为610年;胸径最大为3.08 m;平均冠幅最大为18.8 m。垂乳银杏有82株,单株垂乳个数最多为78个,垂乳最长达0.70 m;复干银杏有56株,单株复干数最多为15株,复干胸径最大为0.95 m;叶籽银杏有4株。 相似文献
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对广西横县镇龙林场不同密度（2 m×2 m、2 m×1.5 m、1.5 m×1.5 m和1 m×1.67 m）的14年生马尾松（Pinus massoniana）人工林凋落物层和土壤层的水源涵养能力进行比较研究。结果表明：密度为2 m×2 m和1.5 m×1.5 m的马尾松林凋落物层蓄积量小于2 m×1.5 m和1 m×1.67 m的马尾松林蓄积量,1 m×1.67 m的马尾松林凋落物层蓄积量最大。凋落物层最大持水量与凋落物层蓄积量呈极显著正相关（P〈0.01）。密度为2 m×2 m和1.5 m×1.5 m的马尾松林土壤层最大持水量大于密度为2 m×1.5 m和1 m×1.67 m的最大持水量;综合水源涵养力则取决于土壤层持水量的大小,4个林型的水源涵养力依次是2 m×2 m〉1.5 m×1.5 m〉2m×1.5 m〉1 m×1.67 m。本研究为马尾松人工林生态功能量化研究提供科学依据。 相似文献
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对华山松在云龙县漕涧地区的造林技术进行了研究,结果表明：在漕涧地区,华山松适宜于海拔2 000~2 800m的微酸性棕壤或黄棕壤,选用天然母树林采种并进行品质检验后育苗,100d出圃,雨季植苗造林,成活率达95%,且比直播造林节约种子1倍以上。 相似文献
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By influencing belowground processes, streamside vegetation affects soil processes important to surface water quality. We
conducted this study to compare root distributions and dynamics, and total soil respiration among six sites comprising an
agricultural buffer system: poplar (Populus × euroamericana‘ Eugenei), switchgrass, cool-season pasture grasses, corn (Zea
mays L.), and soybean (Glycine max (L.) Merr.). The dynamics of fine (0--2 mm) and small roots (2--5 mm) were assessed by
sequentially collecting 35 cm deep, 5.4 cm diameter cores from April through November. Coarse roots were described by excavating
1 × 1 × 2 m pits and collecting all roots in 20 cm depth increments. Root distributions within the soil profile were determined
by counting roots that intersected the walls of the excavated pits. Soil respiration was measured monthly from July to October
using the soda-lime technique. Over the sampling period, live fine-root biomass in the top 35 cm of soil averaged over 6 Mg
ha-1 for the cool-season grass, poplar, and switchgrass sites while root biomass in the crop fields was < 2.3 Mg ha-1 at its maximum. Roots of trees, cool-season grasses, and switchgrass extended to more than 1.5 m in depth, with switchgrass
roots being more widely distributed in deeper horizons. Root density was significantly greater under switchgrass and cool-season
grasses than under corn or soybean. Soil respiration rates, which ranged from 1.4--7.2 g C m-2 day-1, were up to twice as high under the poplar, switchgrass and cool-season grasses as in the cropped fields. Abundant fine roots,
deep rooting depths, and high soil respiration rates in the multispecies riparian buffer zones suggest that these buffer systems
added more organic matter to the soil profile, and therefore provided better conditions for nutrient sequestration within
the riparian buffers.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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为了提高双足机器人行走的稳定性,设计了一种双足仿人机器人,该机器人利用Arduino芯片进行控制。通过对双足机器人整体结构和控制系统的研究,完成了机器人建模、硬件设计和稳定性分析,实验结果表明了该方法的有效性。 相似文献
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There is a need for accurate and efficient methods for quantification and characterisation of forest edges at the landscape level in order to understand and mitigate the effects of forest fragmentation on biodiversity. We present and evaluate a method for collecting detailed data on forest edges in aerial photographs by using line intersect sampling (LIS). A digital photogrammetric system was used to collect data from scanned colour infrared photographs in a managed boreal forest landscape. We focused on high-contrast edges between forest (height ≥ 10 m) and adjoining open habitat or young, regenerating forest (height ≤ 5 m). We evaluated the air photo interpretation with respect to accuracy in estimated edge length, edge detection, edge type classification and structural variables recorded in 20 m radius plots, using detailed field data as reference. The estimated length of forest edge in the air photo interpretation (52 ± 8.8 m ha−1; mean ± standard error) was close to that in the field survey (58 ± 9.3 m ha−1). The accuracy in edge type classification (type of open habitat) was high (88% correctly classified). Both tree height and canopy cover showed strong relationships with the field data in the forest, but tree height was underestimated by 2.3 m. Data collection was eight times faster and five times more cost-effective in aerial photographs than in field sampling. The study shows that line intersect sampling in aerial photographs has large potential application as a general tool for collecting detailed information on the quantity and characteristics of high-contrast edges in managed forest ecosystems. 相似文献
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对草方格铺设机器人平衡系统中的重心位置进行了计算，提出了与草方格铺设机器人类似结构的机器重心位置计算的思路。 相似文献
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The process that tree cone acquisition robot gets cones has been simulated with the process that human bends or stretches his arms in some load. And then the shaft driving force simulation of tree cone acquisition robot in the wording process was analyzed according to biomechanics laws by system modeling simulation analysis software that is used in current popular.The forces of the shafts at shoulder joint and elbow joint of the robot were analyzed,meanwhile,were calculated and drew up the figures by using Maple software.Finally,the analytical results verified the correctness of the theory analysis with Solid Dynamics software.And from the study,the findings provide important theory and parameters for improving the trees cones acquisition robot. 相似文献