共查询到20条相似文献，搜索用时 15 毫秒
1.
苏铁镰刀菌球茎腐烂病化学防治技术研究 总被引：1，自引：0，他引：1
林间调查结果表明：德葆苏铁Cycas debaoensis、四川苏铁C.szechuanensis、十万大山苏铁C.shiwandashanica为苏铁镰刀菌Fusarium solani球茎腐烂病易发病种类;海南苏铁C.hannanensis、元江苏铁C.parvulus和叉叶苏铁C.micholitzii是中等感病品种;越南苏铁C.tonkinensis、贵州苏铁C.guizhouensis、叉孢苏铁C.segmentifida、攀枝花苏铁C.panzhihuaensis、仙湖苏铁C.fairylakea、石山苏铁C.miquelii、单羽苏铁C.simplicipinna、多羽苏铁C.mutltiflrondis为较抗病品种;苏铁C.revoluta和鳞秕苏铁Zamia purouracea是高度抗病品种.在空气干燥的月份,以切除病部＋75%酒精表面消毒＋涂上含有杀虫剂的50%多菌灵WP处理最好,防治效果100%.在雨水多的月份,以切除病部＋75%酒精表面消毒＋涂上含有杀虫剂的50%多菌灵粉剂＋透光防雨罩处理最好,防治效果83.3%.在化学防治过程中,关键要做到病部切除彻底、表面消毒彻底、防治用的药剂充足,避免后期新伤口产生,才能有效地治疗发病苏铁. 相似文献
2.
采用常规育种的方法,以杜鹃叶山茶Camellia azalea和山茶属红山茶组10个原生物种作为杂交育种亲本,设计20个杂交组合,研究其种间杂交亲和性。结果显示,杜鹃叶山茶与红山茶组原生种间反交时的杂交亲和性和育种效率要显著于正交组合。与杜鹃叶山茶进行杂交的亲和性,最好的是多齿红山茶C. polyodonta、南山茶C. semiserrata和浙江红山茶C. chekiangoleosa,其次是尖萼红山茶C. edithae、长毛红山茶C. villosa、滇山茶C. reticulata和全缘红山茶C. subintegra,较差的是厚叶红山茶C. crassissima和怒江红山茶C. saluenensis,最差的是毛蕊红山茶C. mairei。 相似文献
3.
4.
河南铁线莲属植物分类学研究(英文) 总被引：1，自引：0，他引：1
铁线莲属(Clematis L.)是一个在分类上较困难的类群,种类多,形态变化大。全球铁线莲属植物有350余种,中国有150余种。2006年7~8月我们对河南四大山区的铁线莲属植物种类进行了调查、采集和鉴定,标本存放于河南农业大学标本馆(HEAC),此外我们还认真观察了中国科学院植物研究所标本馆(PE)等国内各大标本馆的铁线莲属植物标本。结果表明河南铁线莲属植物24种和11变种,按照王文采等的铁线莲属新分类系统分别隶属于4亚属、7组、11亚组、15系,其中首次报道了半钟铁线莲(C.sibiricavar.ochotensis)和长冬草(C.hexapetalavar.tchefouensis)为河南铁线莲属植物新记录,首次报道了Clematis honanensisS.Y.WangC.L.Chang’作为Clematis pseudootophoraM.Y.Fang in W.T.Wang的新异名。增补《河南植物志》(1981)中未记录的有5种5变种:女萎(C.apiifoliaDC.)、毛萼铁线莲(C.hancockianaMaxim.)、大花威灵仙(C.courtoisiiHand.-Mazz.)、芹叶铁线莲(C.aethusifoliaTurcz.)、巴山铁线莲(Clematis pashanensis(M.C.Chang)W.T.Wang)、扬子铁线莲(C.puberulaHook.f.et Thoms.var.ganpiniana(Levl.et Vant.)W.T.Wang)、狭裂太行铁线莲(C.kirilowiiMaxim.var.chanetii(Levl.)Hand.-Mazz.)、大花绣球藤(C.montanaBuch.-Ham.ex DC.var.grandifloraHook.)、毛叶威灵仙(C.chinensisOsbeck.var.vestita(Rhed.Wils.)W.T.Wang)、狭卷萼铁线莲(Clematis tubulosaTurcz.var.ichangensis(Rehd.Wils.)W.T.Wang)。订正了《河南植物志》(1981)中6个分类群的学名:将C.uncinataChamp.var.biternataW.T.Wang作为C.uncinataChamp.的异名,C.brevicaudataDC.var.filipesRhed.作为C.puberulaHook.f.et Thoms var.tenuisepala(Maxim.)W.T.Wang的异名,C.brevicaudataDC.var.tenuisepalaMaxim.作为C.puberulaHook.f.et Thoms.var.tenuisepala(Maxim.)W.T.Wang的异名,C.argentilucida(Levl.et Vant.)W.T.Wang作为C.grandidentata(Rehd.et Wils.)W.T.Wang的异名,C.obtusidentata(Rhed.et Wils.)H.Eichler作为C.apiifoliaDC.var.argentilucida(Levl.et Vant.)W.T.Wang的异名;将Clematis ternifloraDC.var.latisepalaM.C.Chang作为Clematis pashanensisvar.latisepala(M.C.Chang)W.T.Wang.的异名。 相似文献
5.
福建三明格氏栲林物种多度分布格局研究 总被引：13，自引：0，他引：13
Species abundance distribution was regarded as an important measuring method of species diversity study inCastanopsis kawakamii forest. The log-series model was used to calculate, inspect and draw to illustrate the species abun-dance of 7 main communities by investigating species amounts of community composition types in C. kawakamii forest,which including ( C. kawakamii + Schima superba + Litsea mollifolia, (2 C. kawakamii + Daphniphyllum oldhamii +Schima superba, 3 C . kawakamii + Quercus glandulifera + Ilex purpurea , (4 C . kawakamii pure forest, (5 Pinus massoni-ana+ Schima superba + Elaeocarpus decipiens , ⑥ C . kawakamii + Pinus massoniana + Symplocos stellaris , (7 Castanopsiseyrei + C. kawakamii + Schima superba. The results showed that species abundance of arbor layer, shrub layer, all woodyspecies of 7 main communities in C. kawakamii forest all obey a logarithmic series distribution. 相似文献
6.
FIREENVIRONMENT,FUELSANDFlRECAUSESFireEnvir0nmcntDaxing'anlingf0restareabelongstothefrigid-temPeratemonsoonclimate.Ithasalongwinterandashortsununer.Thereare9monthsofdailytemPeratUreunderlOCandlessthan3OdaysofdailytemPerabeabove22C.ThemeantemperatUreinthecoldestmonth(January)is-25V~-30C,withtheextrCmeof-52.3C,andinthewarmestmonth(July)isl5~2OC,withtheextremeof39C.Thegrowingsea-soninthisareaisonly9O~ll0days.Theaverageannualprecipitationisabout35O~500nun,and80Percentofwhich… 相似文献
7.
根据文献资料和标本馆记录及实地考察,对壳斗科栲属(Castanopsis)植物中的苦槠(C.sclerophylla)、甜槠(C.eyrei)栲树(C.fargesii)、南岭栲(C.fordii)、钩栲(C.tibetana)、罗浮栲(C.fabric)、刺栲、(C.hystrix)、鹿角栲(C.lam ontii)、黧蒴栲(C.fissa)等9种主要栲属植物的地理分布区进行研究,探讨栲属主要树种的分布特点。9种栲属植物呈镶嵌式分布。其中苦槠栲和甜槠是分布在我国最北的栲属树种,其最北可达安徽南部;甜槠栲在我国的分布最广、面积最大。刺栲在我国的分布分为2部分:一部分集中在我国西南地区;另一部分集中在长江以南部分地区。 相似文献
8.
Zhang Xin Zhao Yi-zhi Zhang Zhi-xiang 《中国林学(英文版)》2007,9(2):147-151
Four species of the Comastoma genus (Geianaceae) in Helan Mountains between Inner Mongolia and Ningxia Province in China have been recognized by morphological and geographical taxonomy. These four species are C. falcatum (Turcz.) Toyokuni, C. polycladum (Diels et Gilg) T. N. Ho, C. tenellum (Rottb.) Toyokuni and C. acutum (Michx.) Y. Z. Zhao et X. Zhang. Among them, C. tenellum (Rottb.) is a new recorded species and C. acutum (Michx.) Y. Z. Zhao et X. Zhang is a new combination. The floristic, ecological and geographical distribution of each species was analyzed and then a new key of Comastoma in Helan Mountains and the distribution maps have been generated, which will provide a reference for the revision of this genus and the analysis of the flora in Helan Mountains. 相似文献
9.
Continuous increases in anthropogenic nitrogen(N) deposition are likely to change soil microbial properties, and ultimately to affect soil carbon(C) storage.Temperate plantation forests play key roles in C sequestration, yet mechanisms underlying the influences of N deposition on soil organic matter accumulation are poorly understood. This study assessed the effect of N addition on soil microbial properties and soil organic matter distribution in a larch(Larix gmelinii) plantation. In a 9-year experiment in the plantation, N was applied at100 kg N ha~(-1) a~(-1) to study the effects on soil C and N mineralization, microbial biomass, enzyme activity, and C and N in soil organic matter density fractions, and organic matter chemistry. The results showed that N addition had no influence on C and N contents in whole soil. However,soil C in different fractions responded to N addition differently. Soil C in light fractions did not change with N addition, while soil C in heavy fractions increased significantly. These results suggested that more soil C in heavy fractions was stabilized in the N-treated soils. However,microbial biomass C and N and phenol oxidase activity decreased in the N-treated soils and thus soil C increased in heavy fractions. Although N addition reduced microbial biomass and phenol oxidase activity, it had little effect on soil C mineralization, hydrolytic enzyme activities, d13 C value in soil and C–H stretch, carboxylates and amides, and C–O stretch in soil organic matter chemistry measured by Fourier transform infrared spectra. We conclude that N addition(1) altered microbial biomass and activity without affecting soil C in light fractions and(2) resulted in an increase in soil C in heavy fractions and that this increase was controlled by phenol oxidase activity and soil N availability. 相似文献
10.
11.
广东五种兰属植物的野生分布和生态习性 总被引：1，自引：0，他引：1
我国幅员广大,兰科植物资源十分丰富,约有190个属,1000多个种,其中兰属(Cymbidium)植物在我国已有21个种,占全世界的42％左右,是兰属植物分布中心之一。兰属中的春兰(C. goeringii)、蕙兰(C. faberi)建兰、(C. ensifolium)、寒兰(C. kanran)和墨兰(C. sinense)在我国已有 相似文献
12.
13.
研究了5个柑桔细胞杂种的抗寒性，其结果是伏令夏橙 宜昌橙（C.sinensis Osb.cv.Valencia C.ichangensis Wwingle）抗-11℃、伏令夏橙 ‘key’来蒙（C.sinensis Osb.cv.Valencia C.aurantifolia cv.Key lime）抗-7.59℃、伏令夏橙 宁波金柑（C.sinensis Osb.cv.Valencia Fortunella crassifolia Swingle cv.Meiwa）抗-9.54℃、哈姆林甜橙 粗柠檬（C.sinensis Osb.cv.Hamlin C.jamhiri L.）抗-7.1℃，哈姆林甜橙 飞龙枳（Citrus sinensis Osb.cv.Hamlin Poncirus trifoliata Raf.cv.Flying Dragon）抗-12.89℃）、并且证明了5个体细胞杂种的抗寒性均介于两亲本之间。其中哈姆林甜橙 飞龙枳杂种、伏令夏橙 宜昌橙杂种的抗寒性均高于其它几个组合。还证明了柑桔体细胞杂种的抗寒能力几乎不受栽培管理水平的影响。 相似文献
14.
对26年生楠木人工林和杉木人工林的乔木层+林下植被层C储量及其分配进行了研究,结果表明:楠木林乔木层C储量为61.7 t.hm-2,小于杉木林乔木层C储量(72.7 t.hm-2);而楠木林林下植被层C储量为1.5 t.hm-2,大于杉木林林下植被层C储量(1.0 t.hm-2)。楠木干材的C储量较小,仅为杉木干材C储量的71.1%;但26年生楠木人工林尚未达到蓄积生长的数量成熟阶段,因此仍具有较高的固C潜力。 相似文献
15.
鹃形目鸟类为农林益鸟。据环志网捕统计,青岛地区有鹃形目鸟类6种,即大杜鹃Cuculus canorus Linnacus、棕腹杜鹃C.fugax Horsefield、四声杜鹃C.micropterus Gould、中杜鹃C. satluratus Blyth、小杜鹃C.poliocephalus Latham、鹰鹃C.sparverioides Vigors。除大杜鹃和四声杜鹃为本地区夏候鸟外,其余4种均为旅鸟。自1984年以来,我们对共进行了迁徙规律和食性的研究。 相似文献
16.
文章基于岳阳市2009年森林资源统计数据,对全市森林植被类型的生物量、碳贮量和碳密度进行初步估算。结果表明:岳阳市森林植被碳贮量为9.238Tg,其中,平江县的森林植被C贮量最大,为3.606Tg,占总C贮量的39.03%。各森林类型的C贮量来看,松木林的C贮量最大,为2.754Tg,占总C贮量的29.81%。岳阳市森林植被平均C密度为16.02t.hm-2,各县市区森林植被的C密度为13.39~27.10t.hm-2,森林植被平均C密度最大是云溪区,为29.02t.hm-2,各森林类型中阔叶树的C密度最大,为27.24t.hm-2,是全市森林植被平均C密度的近2倍。
相似文献
17.
18.
决明属几个乔木种的分类问题探讨 总被引：1，自引：0，他引：1
《热带农业科技》2013,(4)
云南野生的腊肠树(Cassia fistula)、神黄豆(C.agnes)、铁刀木(C.siamea)和引种栽培的节果决明(C.nodosa)、绒果决明(C.bakeriana)、红花铁刀木(C.grandis)形态相似,常被认错。结合植株形态比较和文献资料分析,对其6个种的分类处理进行讨论。认为绒果决明、节果决明和神黄豆是同一物种的不同变异类型。 相似文献
19.
首次对河南省紫荆Cercis chinensis Bunge品种资源进行了调查研究。其结果表明,河南紫荆有5个品种:1‘小果’毛紫荆C.chinensis Bunge‘Xiaoguo’,cv.nov.;2‘大果’毛紫荆C.chinensis Bunge‘Daguo’,cv.nov.;3‘二季花’紫荆C.chinensis Bunge‘Ejihua’,cv.nov.;4‘白花’紫荆C.chinensis Bunge‘Alba’,cv.comb.nov.;5‘金帆’紫荆C.chinensis Bunge‘Jinfan’。同时,记述其主要形态特征要点,为其开发利用提供了可靠的科学依椐。 相似文献
20.
WANG Qing-kui WANG Si-long 《林业研究》2006,17(3):197-200
Conversion of natural secondary broad-leaved forest to Cunninghamia lanceolata plantation is a common management practice in subtropical China. In this study, we compared soil physico-chemical properties, microbial biomass in one natural secondary broad-leaved forest and two C. lanceolata plantation sites to estimate the effects of forest conversion on soil microbial biomass at the Huitong Experimental Station of Forestry Ecology, Chinese Academy of Sciences. Concentrations of soil organic carbon, total nitrogen, NH4^＋-N and microbial biomass carbon and nitrogen were much lower under C. lanceolata plantations as compared to natural secondary broad-leaved forest. Soil microbial biomass C in the first and second rotation of C. lanceolata plantations was only 53%, 46% of that in natural secondary broad-leaved forest, and microbial biomass N was 97% and 79%, respectively. The contribution of microbial biomass C to soil organic C was also lower in the plantation sites. However, the contribution of microbial N to total nitrogen and NH4^＋-N was greater in the C. lanceolata plantation sites. Therefore, conversion of natural secondary broad-leaved forest to C. lanceolata plantation and continuous planting of C. lanceolata led to the decline in soil microbial biomass and the degradation of forest soil in subtropical China. 相似文献