共查询到17条相似文献,搜索用时 93 毫秒
1.
2.
刺槐采伐迹地不同更新方式的效果比较王井泉,王军(宿迁市林果站,233800)刺槐具有生长快、材质好、根系发达、繁殖容易、适应性强等特点,是丘陵岗地主要适生树种。惟刺槐串根,萌孽性强,萌条幼龄生长很旺,给重新植苗或更换树种带来很大的困难。为此,宿迁市蟑... 相似文献
3.
杉木采伐迹地更新方式的研究 总被引:1,自引:0,他引:1
杉木是我国特有的优良用材树种,在林业现代化建设中占有十分重要的地位。建国以后,全国杉木造林面积达449万公顷,其中一部分已进入或即将进入主伐阶段。但是,在杉木采伐迹地上重新营造杉木,不仅造林质量低,而且生长缓慢,更新成本较高,严重制约杉木速生丰产林的发展。因此,杉木采伐迹地更新,已日益成为人们关注的问题。我们从198年开始,对这一问题进行了试验研究,通过六年的努力,已经取得显著成效。现将研究结果报告如下。试验地概况 相似文献
4.
本文在对西藏米林县亚高山采伐迹地植被和更新情况调查的基础上,对采伐迹地类型进行了划分。共区分出灌木迹地和草本迹地2大迹地类型,在此基础上,又划分出了4种迹地亚型;不同迹地类型的植物组成和生境特点以及更新状况均存在一定的差异。针对不同迹地类型的生态条件和更新状况,提出了具体的更新技术。 相似文献
5.
<正> 杉木生长快、材质好、经济价值高,是我省栽培广、人工林面积较大的速生优良用材树种,早期营造的杉木林已达到近熟或成熟林阶段,生产单位根据生产和市场的需要,已陆续开展了小面积的采伐和更新。从1987年开始,我省先后分三批在20个园艺林场开展了有计划的经营采伐试点工作。 相似文献
6.
作者应用临时标准地法,对赤松林采伐迹地更新的日本落叶松纯林和与五角枫的混交林进行了林木生长量和土壤调查,初步认为,更新是成功的。日本落叶松幼龄期生长表现良好,比赤松林生长量提高2~3倍。但纯林有酸化土壤的趋势。因此,建议生产单位营造落叶松与耐荫灌木的混交林。 相似文献
7.
根据调查研究和30多年的生产实践,我们认为在北亚热带南缘的太子山地区,在适合杉木生长的宜林地段,杉木采伐后仍然栽杉木。原不适宜杉木生长的土壤,第一代杉木长得不好的地段,杉木采伐后应改换其它树种。更新方式分为两种,一是大面积植苗造林,二是少数地区可以控制采用萌芽更新。 相似文献
8.
9.
长白山森林的采伐更新方式 总被引:5,自引:0,他引:5
This paper discussed the characteristics of degenerated forest ecosystems in Changbai Mountain area,which include over-harvest natural forest,typical secondary forest,derived forest,and artificial forest.Forest cutting and regeneration methods that were historically used in the region were summarized.They lnclude diameter-class selective cutting,clearcutting,upbringing selective cutting,and selective sutting.We proposed cutting methods for the broad-leaved Korean pine mixed forest,spruce-fir forest,and larch forest.The measures for restoring the original mixed forest ecosystems were recommended. 相似文献
10.
11.
Effects of harvesting on soil properties and regeneration quality in larch-birch forest in China 总被引:1,自引:0,他引:1
INTRoDUCTIONoneopeationsite,locatCdin5O'47'Nandl24"2o'E,wasselectCdastCstsite,Wherethelarch(Larixgmelinii)dominatesmostlythetreepopulahonwithnearlyeightypercentin.standingvolume.Theresttreesarebirch.Annalprecipitation,tethperAnandvaPori-zationare5lonun,-2.4Cand3lommrespec-tively.Elevationisaround45Omoversealevel.CuttingmethodsusedinthissitewereselechvecuningandclearcuttingwithgrQUndtractorskiddingaswellasasmallpwtofani-malskidding.CHANGESoFSoILPRoPERTIESCAUSEDBYHARVESTI… 相似文献
12.
13.
14.
15.
The effects of selection felling and gap felling on arthropod communities were studied over 3 years in a spruce-beech stand in southern Bavaria, Germany. The arthropods were sampled in three strata, using pitfall traps on the forest floor as well as flight-interception traps near the forest floor and in the tree crowns. Coleoptera, Araneae, Opiliones, Heteroptera, Isopoda, Diplopoda and Neuropterida were determined to species level and assigned to ecological guilds. In general, the effects of both treatments on arthropod communities were small. An increase of eurytopic species and species of open woodland as well as of indwellers of deadwood was observed, mainly in the first year after felling. However, forest species dominated the communities in all plots, strata and years. In contrast to selection fellings, gap fellings might favour potential pest species. Nevertheless, in the studied managed spruce-dominated forest site out of the natural growth range of spruce, negative ecological effects such as the repression of forest arthropod species are not expected by small scale fellings. 相似文献
16.
17.
芬兰采运设备多为大型高效机械,如集材机,赛速运材汽车,由于我林区道路网密度低,等极差,其生产效率无法正常发挥,欲发挥其功效必须研究与其配套的道路建设问题,其涉及技术问题,同时又是一个经济问题。 相似文献