伐木作业过程中时间统计分析     

王永安  李利权 《吉林林学院学报》1998,14(2):122-124

应用数理统计方法，结合带岭林业局寒月林场伐木作业，对伐木作业过程中的伐木切削时间和林内行走速度（时间）进行了统计分析．结果表明，伐木切削时间是树种和径级的函数，林内行走速度服从正态分布．  相似文献   

水稻机械割晒拾禾研究分析     

刘海鹰  牛艳凯  孙继祥  李世军  张卓 《北方水稻》2009,39(6):35-36,50

建三江地区由于以往收获方式的单一,各种机械配置的不合理及农户对机械收获的认识不全面,收获条件差异等问题的存在,严重影响了水稻机械收获的进度。为了确保粮食保质保量的收获,通过对水稻割晒拾禾可行性、优越性、实施方案及可能存在的问题和注意事项的分析研究,在当地全面推广了水稻机械割晒和机械化直收相结合的收割方式,为实现水稻增产增收提供有利保证。  相似文献   

谈红皮云杉“全光下雾插“育苗介绍     

左晓初  孔庆田 《林业勘查设计》2007,(3):47-48

从生物培育技术角度分析介绍了利用喷雾设备提高红皮云杉在全光条件下扦插成活率的方式方法。  相似文献   

不同扦插密度与施肥模式对马铃薯微型薯产量的影响   总被引：2，自引：0，他引：2  

桑有顺  冯焱  于莉娟  黄敏  陈涛 《西南农业学报》2009,22(5)

以中薯2号的脱毒试管苗为试材,研究不同扦插密度与施肥模式对成都地区马铃薯微型薯产量的影响.结果表明:扦插密度为78株/盘(624株/ m2),其产量最高,平均每盘合格薯为77.2个,平均每盘薯重155.5g;在生根第1、2周喷施烟草复合肥70 g+尿素30 g+水15 kg,在第3、第4周喷施烟草复合肥100 g+水15 kg,在第5、6周喷施烟草复合肥60 g+磷酸二氢钾40 g+水15 kg,采用该施肥处理产量最高,其单薯重为1.93 g,每盘产薯重178.4 g.  相似文献   

Long-term palliation of right-sided congestive heart failure after stenting a recurrent cor triatriatum dexter in a 10½-year-old pug     

《Journal of Veterinary Cardiology》2022

A 10½-year-old, male neutered, pug presented with increasing ascites over two months. Echocardiography revealed cor triatriatum dexter with no concurrent cardiovascular anomalies, subsequently confirmed by computed tomography angiography. Balloon dilation of the perforated intra-atrial membrane under fluoroscopic guidance resulted in the transient resolution of all clinical abnormalities, but six months later stenosis and ascites recurred. After repeated balloon dilation, a stent was placed across the membrane. The dog remains asymptomatic fourteen months after the second procedure. One noteworthy feature of this case is the onset of congestive heart failure due to a congenital defect only at more than 10 years of age.  相似文献   

杉木人工林不同采伐方式综合效益研究   总被引：4，自引：0，他引：4  

邹礼光 《防护林科技》2004,(6):22-23,76

采用层次分析法,对杉木人工林不同采伐方式的生态、社会、经济及综合效益进行分析,结果表明:经济效益方面,皆伐最高,70%择伐次之,50%择伐第三,30%择伐最小;生态效益方面,70%择伐最高,皆伐最小;社会效益方面,50%择伐最高,皆伐最小。综合效益以70%强度择伐最大,50%择伐其次,皆伐第三,30%择伐最小。建议杉木林主伐采用强度为70%择伐方式进行。  相似文献   

盆栽龙胆的微体扦插繁殖研究     

王国良  李林  赵永艳  闫小红 《江苏林业科技》2004,31(5):8-10,13

本试验采用5种不同扦插基质及4种不同规格的盆栽龙胆插穗进行微体扦插繁殖试验。结果表明，70％泥炭 30％珍珠岩较适宜龙胆扦插、生根，插穗长度以3节插穗为好。  相似文献   

滨海盐碱地柽柳扦插育苗试验报告   总被引：4，自引：0，他引：4  

赵延茂  刘月良 《山东林业科技》1997,(3):1-4

为选择合理的柽柳扦插育苗技术，在东营市中部和北部沿海地区进行了扦插育苗正交试验和对比试验。结果表明：插穗长度和粗度是影响扦插成活率和苗木生长量的主要因素，插穗长１５～２０ｃｍ、粗≥０．５０ｃｍ育苗效果较好。覆盖地膜可明显提高扦插育苗成活率和苗木生长量，且随土壤含盐量增加，效果越显著。同时，该文总结了用１年生扦插苗培养柽柳大苗的关键技术  相似文献   

花旗松扦插中愈伤组织的形成     

韩创举  张存旭  高泉  何冉贵 《林业科技开发》2007,21(1):78-80

花旗松扦插诱导愈伤组织试验结果表明:硬枝扦插形成愈伤组织好于嫩枝扦插,3月份(树液流动前)是花旗松硬枝扦插形成愈伤组织的最佳时间.扦插基质以河沙1 黄土1为佳.扦插地点的地表温度低于20℃不利于愈伤组织产生,花旗松形成愈伤组织需要2个月时间.  相似文献   

Difference in cutting age for highest profit by methods for calculating CO<Subscript>2</Subscript> emission trading and the price of CO<Subscript>2</Subscript>     

K. Sakata  Y. Konohira 《Journal of Forest Research》2003,8(2):0111-0115

 The amounts of CO₂ that are absorbed and emitted by forest in a model stand area were determined using two calculation methods, namely the flow approach and the stock approach for emission trading, to understand the relationships between the cutting age for the highest profit rate (CAHPR; optimum tree ages to be cut so as to maximize the profit) and (1) the prices of CO₂ and (2) the balance between CO₂ emission and absorption. The resultant CAHPR differed between these two CO₂ accounting methods, which give different tree ages for maximum log volume yield. A rise in CO₂ price caused the CAHPR to approach the tree age of maximum log volume in the flow approach method, and to deviate from the tree age of maximum log volume in the stock approach method. Even at the same CO₂ price, the CAHPR differed between the CO₂ accounting methods. At low CO₂ prices, the CAHPR did not affect situations where the difference of average profit is large by cutting age. On the other hand, the CAHPR was greatly affected at low CO₂ prices when the mean log volume growth changed with tree age. These trends were found to be universal. Received: September 18, 2001 / Accepted: October 25, 2002 Acknowledgments This study is one of the fifth science study subsidy projects of the Japan Forest Technology Association. Correspondence to:K. Sakata  相似文献