Nutrients in litterfall,forest floor and mineral soils in two adjacent forest ecosystems in Greece     

Panagiotis Michopoulos  Kostas Kaoukis  George Karetsos  Theodoros Grigoratos  Constantini Samara 《林业研究》2020,31(1):291-301

The fluxes of masses and the nutrients Ca,Mg,K,N,P and S were determined in the litterfall of two adjacent forest ecosystems of Hungarian oak(Quercus frainetto L.)and European beech(Fagus sylvatica L.)in a mountainous area of northeastern Greece in 2010–2015.The foliar litterfall for both species reached about 70%of the total litterfall,and was significantly higher from the other two fractions(woody and rest litterfall).The fluxes of masses and nutrients were compared between ecosystems for each fraction separately.Only one significant statistical difference was found,that of K in the woody litterfall.In addition,the stocks of masses and nutrients were calculated in the forest floors and mineral soils of the two ecosystems.Likewise,the stocks of nutrients in the forest floors and mineral soils were compared between ecosystems.In the L horizon of the forest floors,statistical differences,as a result of species effect,were found for the stocks of Ca and N.In the FH horizons,the masses and all the nutrient stocks differed significantly,as the beech plot had much higher quantities of organic matter and nutrients.These higher quantities were probably due to low soil temperatures(microclimate)and high acidity in the beech plot(species effect)that slowed down decomposition.In the mineral soils,the propagation of random error derived from random errors of the individual soil layers was an important factor in the statistical comparisons.Because of the soil acidity in the beech plot,the stocks of exchangeable base cations were significantly higher in the oak plot,whereas the other nutrient stocks did not differ.  相似文献   

柞树害虫栎粉舟蛾的初步研究     

魏成贵  吴佩玉  曲卫国  李杰 《蚕业科学》1986,(4)

栎粉舟蛾Femtoma ocypete(Bremer)是柞树的重要害虫之一。此虫在辽宁一年发生一代,以蛹在土中越冬。翌年7月中旬开始羽化,持续到8月中旬。羽化后即可交配产卵。7月下旬到8月下旬均有幼虫孵出。幼虫经6个龄期,于9月中、下旬入土化蛹。防治方法:8月中旬往柞树上喷洒0.025％浓度的“杀虫灵”农药,能杀死各龄幼虫,防治效果为90％左右,七天后养蚕无害。  相似文献   

中国柞树主要害虫名录(Ⅲ)   总被引：2，自引：2，他引：0  

穆秀奇  李喜升  董绪国  吴艳  石淑萍  赵世文  陈增良  赵娜  滕雪莹  杨瑞生  宋策 《蚕业科学》2010,36(4):671-675

记述了鳞翅目(Lepidoptera)灯蛾科(Arctiidae)和夜蛾科(Noctuidae)的柞树主要害虫75种,分别介绍了害虫的中文名称、学名、寄主种类及在我国的主要分布区域,为有效控制灯蛾类、夜蛾类柞树主要害虫的发生与危害提供相关的基础信息。  相似文献   

油松、辽东栎混交林中生化他感作用的研究   总被引：32，自引：0，他引：32  

贾黎明  翟明普  尹伟伦 《林业科学》1995,(6)

研究了油松（ＰｉｎｕｓｔａｂｕｌａｅｆｏｒｍｉｓＣａｒｒ．）、辽东栎（ＱｕｅｒｃｕｓｌｉａｏｔｕｎｇｅｎｓｉｓＫｏｉｄｚ．）混交林中的生化他感作用，结果表明：油松、辽东栎纯林及松栎混交林下的枯落叶、半分解枯落叶及表层土壤水浸液对油松及其它植物的种子发芽和幼苗胚根、幼茎生长有显著的影响，一般在高浓度下表现为强烈的抑制作用，低浓度下作用不显著或起促进作用。其中辽东栎枯落叶水浸液的抑制作用最为强烈，混交林中枯落叶的抑制作用有所下降。说明在某些条件（干旱、混交比例和混交方式不当）下，两树种混交可引起林地生化他感物质富积，从而导致油松生长不良，林地生产力下降。解释了实际林地的现象，为营造松栎混交林提供了依据。  相似文献   

2．5cm栎木地板毛坯的快速干燥     

李增超  邱增处  吴萌 《木材工业》2001,15(4):30-31,34

本文介绍根据根据三段连续升温干燥基准，增加热湿处理工艺，对2．5厘米栎木地板毛坯用炉气间接加热木材干燥窑进行快速窑干，干燥周期较常规窑干缩短30％，干燥质量良好，操作方便。  相似文献   

Signals of summer drought in crown condition data from the German Level I network     

Walter Seidling 《European Journal of Forest Research》2007,126(4):529-544

Crown transparency estimates of Scots pine, Norway spruce, common beech, pedunculate and sessile oak, annually surveyed between 1990 and 2004 within a grid over Germany, provide a suitable response variable to study drought effects on forest trees. Major climatic factors, available on a monthly basis as plot-specifically interpolated values and parameters of site and stand conditions, biotic and other relevant factors were used as predictors in different cross- and length-sectional, and longitudinal models. Stand age is a considerable and most constant driver of crown transparency in all species. Pine, spruce and beech responded—mainly with a delay of 1 year—with some foliar loss in areas where there was a surplus of temperature after the generally hot and dry summer of 2003. Parallel time-series analyses delivered species-specific geographic large-scale patterns with delayed or recent precipitation deficits or temperature surpluses. Even if beech is partly responding in current years with leaf loss towards precipitation surpluses, defoliation is especially high 1 year after hot summers, partly a result of high seed sets after such summers. Crown condition of oak responds in dry and warm areas according to the drought stress hypothesis, however, in cool and wet mountainous ranges oak responds after wet summers with higher defoliation. Longitudinal approaches revealed for all 4-tree species significant relationships between crown condition and deviations from the long-term means of temperature, precipitation but also global radiation and wind speed. Results do not always match the drought stress hypothesis, however, this is not to expect considering the heterogeneous site, stand and climatic conditions across Germany. Complex interactions of climatic and biotic factors also impede simple relationships. Soil-related clusters reveal higher sensitivity of spruce and beech towards climatic drought factors on more acid soils with thin humus layers. Also clusters constructed from plot-specific courses of defoliation reveal groups with rather closer relationships like a group of pine plots in the Oberpfalz, which seems to be especially sensitive to summer drought.  相似文献   

2.5cm栎木地板毛坯的快速干燥新方法     

李增超  邱增处  雷亚芳 《林产工业》2001,28(1):20-22

采用干球温度不变、湿球温度连续下降的干燥新工艺对２．５ｃｍ 栎木地板毛坯用炉气间接加热木材干燥窑进行快速窑干试验，结果表明干燥周期较常规窑干燥缩短了４０％，锯材干燥质量良好，干燥基准操作方便。  相似文献   

Effects of prescribed fire on canopy foliar chemistry and suitability for an insect herbivore     

L. K. Rieske  H. H. Housman  M. A. Arthur 《Forest Ecology and Management》2002,160(1-3):177-187

We assessed the effects of a prescribed fire on the phytochemical characteristics and vigor of overstory chestnut oak, scarlet oak, and red maple, and measured the impact of potential changes on herbivore fitness. We compared foliar carbohydrates, tannins, nutrients, and fiber concentrations in foliage from burned and non-burned forest canopies. There were significant differences in most foliar characteristics between tree species. Total non-structural carbohydrate concentrations in scarlet oak and red maple foliage, and calcium levels in red maple foliage, were significantly lower in burned plots, but other phytochemical characteristics were largely unaffected by burning. Tree growth also varied with species. Burning increased chestnut oak relative growth, decreased scarlet oak growth, and had no affect on red maple growth. Scarlet oak and red maple foliage from burned and non-burned forest canopies were assayed for gypsy moth performance. Caterpillars fed foliage from scarlet oak, the preferred host, grew larger and developed more rapidly than did those fed red maple foliage. There were no significant burn treatment differences in caterpillar development within either tree species, suggesting that managers using prescribed fire to promote oak regeneration need not worry about enhancing forest stand susceptibility to gypsy moth. However, the fire in this study was of low to moderate intensity; more intense fires may alter foliar palatability.  相似文献   

柞、硬阔叶树与软阔叶树原条材种出材量(率)表的编制          下载免费PDF全文

宁守国  安延杰  姜文南 《林业科学研究》1992,(6):731-733

我国50～60年代初期,林业部综合队曾编制红松(Pinus koraiensis Sieb.et Zucc.)、云杉(Picea spp.)、马尾松(Pinus massoniana Lamb.)、兴安落叶松(Larix gmelini(Rupr.)Rupr.)、白桦(Betula platyphylla Suk.)等树种材种出材量表,70～80年代各省(区)市、规划院、科研等单位对杉(Cunninghamia lanceolata Hook.)、落叶松、山杨(Populus davidiana  相似文献   

Herbaceous species diversity in relation to fire severity in Zagros oak forests,Iran     

Morteza Pourreza  Seyed Mohsen Hosseini  Ali Akbar Safari Sinegani  Mohammad Matinizadeh  Seyed Jalil Alavai 《林业研究》2014,25(1):113-120

Zagros forests are mainly covered byQuercus brantii L. coppices and oak sprout clumps occupy the forest area like patches. We investigated post-fire herbaceous diversity in the first growing season after fire. For this purpose neighboring burned and unburned areas were selected with the same plant species and ecological conditions. The data were collected from areas subjected to different fire severities. Overall 6 treatments were considered with respect to fire severity and the mi-crosites of inside and outside of oak sprout clumps including： unburned inside and outside of sprout clumps （Ni and No）, inside of sprout clumps that burned with high fire severity （H）, inside of sprout clumps that burned with moderate fire severity （M）, outside of sprout clumps that burned with low fire severity （OH and OM）. Different herbaceous com-position was observed in the unburned inside and outside of oak sprout clumps. The species diversity and richness were increased in treatments burned with low and moderate fire severity. However, in treatment burned with high fire severity （H）, herbaceous cover was reduced, even-ness was increased, and richness and diversity were not significantly changed. We concluded that besides the microsites conditions in forest, fire severity is an inseparable part of the ecological effect of fire on her-baceous composition.  相似文献