Host status of cover crops for root-lesion nematodes (Pratylenchus spp.) associated with apple orchards in South Africa     

Knoetze  Rinus  Addison  Matthew  De Waele  Dirk 《植物病害和植物保护杂志》2023,130(1):105-113

Journal of Plant Diseases and Protection - The host response of 17 cover crop cultivars to infection by single-species populations of Pratylenchus hippeastri, Pratylenchus vulnus and Pratylenchus...  相似文献   

杜仲生长节律与施肥技术简报     

何景峰  唐德瑞  陈竹君  李群学  罗建民  李孟生 《陕西林业科技》2001,1(1):13-16

杜仲高生长以4－7月份生长最快，6月份达最高峰；径生长以5－7月为旺盛期，其中6、9月各有一次生长高峰；杜仲林地施肥以4－5月为最佳；施肥量为一个区间，且因树龄而异；施肥按坡台地和平地进行沟施和穴施。  相似文献   

广东象头山保护区野生动物资源调查和保护对策     

杨道德吴宏道  朱德冲张应扬 《中南林业科技大学学报(自然科学版)》2001,21(1):69-73

为掌握资源现状,受惠州市林业局委托,于1999年5～6月对象头山自然保护区的野生动物资源进行了综合考察,共发现野生动物203种,隶属4纲25目69科，其中两栖纲、爬行纲、鸟纲和哺乳纲分别有19、42、113和29种.东洋界种类占77.33%，动物地理区划属东洋界华南区闽广沿海亚区.国家一、二级保护动物分别有2和23种.最后分析了资源状况，并提出了保护对策.  相似文献   

Short term effects of simulated acid mist on gas exchange of Eucalyptus globulus1     

R. Valentini  G. Scarascia-Mugnozza  P. De  Angelis  R. Monaco 《Forest Pathology》1989,19(4):200-205

The effects of simulated acid mist treatment on net photosynthesis were determined on Eucalyptus globulus trees. Net assimilation decreased for all the three levels but after 3—4 days recovered only in the pH 3.5 one. Acidity effects are discussed in terms of morphological change to the leaves and as alteration of stomatal and mesophyll resistances. 1 Research work supported by C.N.R., Italy. Special grant I.P.R.A. sub-project 1. paper N. 2014  相似文献   

The T'OLCHE', a Maya system of communally managed forest belts: the causes and consequences of its disappearance     

G. G. A. Remmers  H. De Koeijer 《Agroforestry Systems》1992,18(2):149-177

The T'OLCHE' is a protected forest belt about 10–20 m wide that runs through the Mayan landscape on the limits of the maize fields of the farmers. This study explores its traditional use and management and traces how it has changed in the last 30 years in the study village in Yucatán, Mexico. A major change is in its extent; little remains of the 10–20% of the area it occupied in the past. Two of the causes of this are identified as being a credit programme of the local bank and 1973 state legislation concerning cattle. The causes and consequences of this decline are discussed in relation with other farmer-perceived changes in overall landuse, including a fall in maize yields. The ecological roles of the T'OLCHE' are examined. It is argued that the T'OLCHE' plays an essential role in the regeneration of the fallow vegetation and in the maintenance of biological diversity. The case of the T'OLCHE' suggests the need for a diversified and politicized look on Common Property Resource Management.  相似文献   

巨尾桉在龙岩市引种状况的调查分析   总被引：2，自引：0，他引：2  

黄德先  邓元德 《福建林业科技》2002,29(2):50-53

通过对龙岩市引种的巨尾桉 (E .grandis×E .urophylla)林分的生长状况及受冻情况的调查 ,结果表明 :巨尾桉生长迅速、丰产性好 ;冻害程度与地形、林分年龄、水体等因素有关。值得进一步扩大试验和在相应地区推广种植  相似文献   

Pimarane diterpene from Viguiera arenaria (Asteraceae) inhibit rat carotid contraction     

Ambrosio SR  Tirapelli CR  Bonaventura D  De Oliveira AM  Da Costa FB 《Fitoterapia》2002,73(6):484-489

ent-Pimara-8(14),15-dien-19-oic acid (PA) isolated from Viguiera arenaria (Asteraceae; Heliantheae) inhibited rat carotid rings contraction induced by phenylephrine (10(-8) mol/l) or potassium chloride (45 mmol/l) at concentration ranging from 5 to 20 microg/ml. This inhibitory effect was not reversible after the removal of this compound from the medium bath.  相似文献   

杀虫灯已成为森林害虫综合治理的重要工具     

尤德康  宋玉双 《中国森林病虫》2002,21(Z1):4-6

近年来,以佳多频振式杀虫灯为代表的灯光诱杀器械,其技术性能得到较大改进和提高.在监测功能的基础上,作为诱杀工具,得到广泛认可,防治森林害虫范围不断扩展,防治面积越来越大,展现出广阔的应用前景.  相似文献   

真菌致泡桐材组分变化研究     

胡伟华  常德龙  李福海  黄文豪  张云岭  方桂珍 《林产化学与工业》2001,21(1):65-68

用FTIR、ESCA等波谱分析方法，对真菌侵蚀的泡桐材进行了分析，结果表明：真菌侵蚀后，泡桐材的木质素含量相对比例增加、半纤维素含量降低、纤维素含量变化不明显。  相似文献   

内蒙古沙漠化土地现状、成因与防治     

阎德仁  张化珍 《内蒙古林业科技》2001,(2):37-40

从内蒙古沙漠土地的现状，发展趋势的分析，探讨了沙漠化土地形成的人为因素及其关系，提出了防治沙漠化土地扩展的思路和对策。  相似文献