祁连山保护区东端气象因子与草原死体可燃物含水率拟合模型构建

分析了祁连山保护区东端气象因子与草原死体可燃物含水率的关系,结果表明,祁连山保护区东端草原死体可燃物含水率与降水量、温度、相对湿度、连续干旱天数、风速和蒸发量6个气象因子显著相关,显著性水平为0.05。以草原死体可燃物含水率为应变量,降水量、温度、相对湿度、连续干旱天数、风速和蒸发量为自变量,建立了拟合模型。经检测,模型估算值与实测结果误差较小,可为祁连山保护区东端草原火灾预测预防提供较为准确的数据。     

祁连山保护区东端气象因子与灌木林死体可燃物含水率拟合模型构建

分析了祁连山保护区东端气象因子与灌木林死体可燃物含水率的关系,结果表明,祁连山保护区东端灌木林死体可燃物含水率与降水量、温度、相对湿度、连续干旱天数、风速和蒸发量6个气象因子显著相关,显著性水平为0.05。以灌木林死体可燃物含水率为应变量,降水量、温度、相对湿度、连续干旱天数、风速和蒸发量为自变量,建立了拟合模型。经检测,模型估算值与实测结果误差较小,可为祁连山保护区东端灌木林火灾预测预防提供较为准确的数据。     

祁连山保护区西端气象因子与灌木林死体可燃物含水率拟合模型构建

分析了祁连山保护区西端气象因子与灌木林死体可燃物含水率的关系,结果表明,祁连山保护区西端灌木林死体可燃物含水率与降水量、温度、相对湿度、连续干旱天数、风速和蒸发量6个气象因子显著相关,显著性水平为0.05。以灌木林死体可燃物含水率为应变量,降水量、温度、相对湿度、连续干旱天数、风速和蒸发量为自变量,建立了拟合模型。经检测,模型估算值与实测结果误差较小,可为祁连山保护区西端灌木林火灾预测预防提供较为准确的数据。     

祁连山保护区东端气象因子与针阔混交林死体可燃物含水率拟合模型构建

分析了祁连山保护区东端气象因子与针阔混交林死体可燃物含水率的关系,结果表明,祁连山保护区东端针阔混交林死体可燃物含水率与降水量、温度、相对湿度、连续干旱天数、风速和蒸发量6个气象因子显著相关,显著性水平为0.05。以针阔混交林死体可燃物含水率为应变量,降水量、温度、相对湿度、连续干旱天数、风速和蒸发量为自变量,建立了拟合模型。经检测,模型估算值与实测结果误差较小,可为祁连山保护区东端针阔混交林火灾预测预防提供较为准确的数据。     

祁连山保护区西端气象因子与青海云杉林死体可燃物含水率拟合模型构建

分析了祁连山保护区西端气象因子与青海云杉(Picea crassifolia)林死体可燃物含水率的关系,结果表明:祁连山保护区西端青海云杉林死体可燃物含水率与降水量、温度、相对湿度、连续干旱天数、风速和蒸发量6个气象因子显著相关,显著性水平为0.05。以青海云杉林死体可燃物含水率为应变量,降水量、温度、相对湿度、连续干旱天数、风速和蒸发量为自变量,建立了拟合模型。经检测,模型估算值与实测结果误差较小,可为祁连山保护区西端青海云杉林火灾预测预防提供较为准确的数据。     

祁连山保护区东端气象因子与青海云杉林死体可燃物含水率拟合模型构建

分析了祁连山保护区东端气象因子与青海云杉(Picea crassifolia)林死体可燃物含水率的关系。结果表明,祁连山保护区东端青海云杉林死体可燃物含水率与降水量、温度、相对湿度、连续干旱天数、风速和蒸发量6个气象因子显著相关,显著性水平为0.05。以青海云杉林死体可燃物含水率为应变量,降水量、温度、相对湿度、连续干旱天数、风速和蒸发量为自变量,建立了拟合模型。经检测,模型估算值与实测结果误差较小,可为祁连山保护区东端青海云杉林火灾预测预防提供较为准确的数据。     

祁连山保护区西端气象因子与草原火险等级相关性分析

通过对祁连山保护区西端草原可燃物含水率与气象因子相关性分析,采用统计回归法,建立了草原可燃物含水率与气象要素关系模型,以草原死体可燃物引燃含水率为基准,结合燃烧实验,确定了祁连山保护区西端草原火险等级对应的气象因子,结果表明:草原可燃物含水率模型模拟效果较好,引入草原可燃物含水率气象预测模型可提高草原火险气象指数模型的应用效果,为祁连山保护区西端草原火灾预测预防提供了科学依据。     

祁连山保护区东端气象因子与草原火险等级相关性分析

通过对祁连山保护区东端草原可燃物含水率与气象因子相关性分析,采用统计回归法,建立了草原可燃物含水率与气象要素关系模型,以草原死体可燃物引燃含水率为基准,结合燃烧实验,确定了祁连山保护区东端草原火险等级对应的气象因子,结果表明:草原可燃物含水率模型模拟效果较好,引入草原可燃物含水率气象预测模型可提高草原火险气象指数模型的应用效果,为祁连山保护区东端草原火灾预测预防提供了科学依据。     

祁连山保护区东端气象因子与灌木林火险等级相关性分析

通过对祁连山保护区东端灌木林可燃物含水率与气象因子关系分析,采用统计回归法,建立了灌木林可燃物含水率与气象要素关系模型,以灌木林死体可燃物引燃含水率为基准,结合燃烧实验,确定了祁连山保护区东端灌木林森林火险等级对应的气象因子,结果表明:森林可燃物含水率模型模拟效果较好,引入森林可燃物含水率气象预测模型可提高森林火险气象指数模型的应用效果,为祁连山保护区东端灌木林火灾预测预防提供了科学依据。     

祁连山保护区西端气象因子与灌木林火险等级相关性分析

通过对祁连山保护区西端灌木林可燃物含水率与气象因子关系分析,采用统计回归法,建立了灌木林可燃物含水率与气象要素关系模型,以灌木林死体可燃物引燃含水率为基准,结合燃烧实验,确定了祁连山保护区西端灌木林森林火险等级对应的气象因子,结果表明:森林可燃物含水率模型模拟效果较好,引入森林可燃物含水率气象预测模型可提高森林火险气象指数模型的应用效果,为祁连山保护区西端灌木林火灾预测预防提供了科学依据。     

Spotting ignition of larch(Larix gmelinii) fuel bed by different firebrandsOA

Spot fire increase the difficulty of fire-fighting and threaten public safety, and therefore it is important to study ignition probabilities of fuel bed by different firebrands, in order to understand ignition mechanisms and analyze the formation of spot fires. This will provide an important basis for further study to improve the fire-fighting efficiency and reduce casualties. In this study, the ignition probabilities of larch(Larix gmelinii) fuel beds with different moisture levels and packing ...     

透光抚育对张广才岭“栽针保阔”红松林群落生产力的影响

介绍了透光抚育对不同立地(不同坡位)上的栽针保阔红松林群落的公顷蓄积和生产力的影响,研究分析如何通过不同强度透光抚育提高栽针保阔红松林群落生产力。     

松苗立枯病的无公害防治技术

利用泡底土、非耕作层土、草炭、落叶松干叶混锯末、牛粪水5种材料做覆土盖种的试验结果表明，防治樟子松苗立枯病效果最好的是松干叶混锯末小区，其次是泡底土小区；防治红松苗立枯病效果最好的是泡底土小区，其次是草炭小区。同时，这几种覆土材料对苗木的苗高、地径生长都有一定的促进作用。     

Growth models and site index table of natural Korean pine forests

IntroductionKoreanpine(PinuskOraiensisSieb.etZucc.)isoneofthemostimportanttimberspeciesanditisnaturaIIydistributedinHeilongjiang,JiIinandLiaon-ingprovincesinChina.ManyforestryresearchersmadeextensiveandprofoundstudiesonthisspeciesJiangYiyin(1985)studiedthegroWthandgrowthmodelsforpIantationsofKoreanpine.However,veryfewpaperswerefoundonthegroWthmodeIsofnaturalKoreanpineforest.Koreanpinehasa1onggroWthperiod.ForextensivelymanagingKoreanpineforest,itneedstheJorestrytabIeswithhighac-Curacy…     

不同覆盖物对红松播种苗床土壤特性及育苗效果的影响

为了解不同覆盖物对红松播种苗床土壤日蒸发量、土壤表层温度和种子出苗率及幼苗生长的影响,开展了不同覆盖物红松播种试验.结果 表明:不同覆盖物下土壤日蒸发量由大到小依次为CK、河沙、草炭土、松针、锯末和豆秸;河沙覆盖的土壤表层温度最高,其次是松针覆盖,豆秸覆盖的最低,锯末和草炭土覆盖下的土壤温度两者相差不大;松针、草炭土、...     

松针多糖的提取工艺优化

对从松针中提取多糖的工艺条件进行了研究.在提取过程中,比较了水、醇两种溶剂对3种松针提取的多糖得率的影响.并通过单因素法分析了5个主要因素:料液比、提取温度、提取时间、pH值及提取次数对湿地松松针水提多糖得率的影响.在单因素试验的基础上,通过正交试验设计方法对水提湿地松松针多糖的工艺条件进行了优化.试验表明,湿地松松针多糖的最佳提取工艺条件为:料液比1∶14(g∶mL),提取温度100℃,浸提时间3h,pH值6.在此最佳工艺条件下,湿地松松针多糖得率为4.024%±0.017%.     

树木、林内、林冠上与森林区风速廓线研究

One of the most important and frequently studied variable in forests and the most basic element in governing transport processes of airflow is wind speed. The study of wind profile, defined as the change of wind velocity with height, and wind velocity are important because of tree physiological and developmental responses. Generally, wind profiles above the ground or at a canopy surface follow classical logarithm law, but wind profiles in a single tree and in a forest stand are not logarithmic. This paper summarizes the results of wind profile studies within a single tree, in a forest stand, above the forest canopy and in a forest area from recent research in a coastal pine forest. The results demonstrate that: 1) wind profiles with in a single conifer tree crown showed an exponential function with height, 2) wind profiles in forest stands were able to be expressed by attenuation coefficient of wind, 3) wind profiles over a forest canopy could be determined using profile parameters (friction velocity, roughness length and displacement), and 4) for a forest area, the extreme wind speed could be predicted reasonably using the methods developed for the design of buildings. More research will be required to demonstrate: 1) relationships between wind profiles and tree or stand characteristics, 2) the simple methods for predicting wind profile parameters, and 3) the applications of wind profile in studies of tree physiology, forest ecology and management, and the detail ecological effects of wind on tree growth.     

松针叶绿素-胡萝卜素软膏对实验性胃溃疡的防治作用

采用幽门结扎致大鼠胃溃疡模型、乙醇致大鼠胃溃疡模型和醋酸致大鼠胃溃疡模型进行实验,通过测定胃溃疡面积计算3种模型的胃溃疡抑制率,考察了幽门结扎大鼠的胃液及胃蛋白酶活性和大鼠醋酸型胃溃疡病理切片,从而研究了松针叶绿素-胡萝卜素软膏的抗胃溃疡作用.结果表明:松针叶绿素-胡萝卜素软膏0.75、1.50和2.25 g/kg 3...     

STUDY ON KOREAN PINE FUEL TYPES

Koreanpine(Pnuskorabois)isoneofthemostimpohanttrdesPeCiesinnortheastChina,anddistributesnatUraIlyintheeastmountains(theXiaoxing'anMountainsandtheChangbaiMountains)ofthearea.Alongwiththedevelopmentofforestindusnyinthisarea,thevirgnforestSredueeraPidly,andtheplan-tationsofthesPeCiesincreaseyearly.KoreanpineplantationsaremuchmorecombustiblethanitSnaturalforestS(broad-leaVdsoreanpineforestS).FueltyPesIUdyinChinabeganinearlyl98o's.ThereisnosystematicstUdyonKoreanpinefueltyPesuptonow.Base…     

Seasonal differences in freezing stress resistance of needles of Pinus nigra and Pinus resinosa: evaluation of the electrolyte leakage method

Seasonal changes in freezing stress resistance of needles of red pine (Pinus resinosa Ait.) and Austrian pine (Pinus nigra Arnold) trees were measured by an electrolyte leakage method and by visual observation. During most of the year, freezing stress resistance determined by the two methods gave similar results. The electrolyte leakage method provided a good estimate of seasonal changes in freezing stress resistance except for red pine needles in their most winter-hardy state. To obtain a reliable estimate of freezing stress resistance in winter-hardy red pine needles it was necessary to combine the electrolyte leakage method with visual observations. When red pine needles survived exposure to -80 degrees C or lower, electrolyte leakage was never more than 30% even when the needles were exposed to a slow freeze-thaw stress of -196 degrees C. However, rapid freezing of red pine needles to -196 degrees C resulted in electrolyte leakage of over 80%. Red pine needles attained a much higher freezing stress resistance during the winter than Austrian pine. Red pine needles also acclimated and deacclimated faster than Austrian pine needles. An index of injury was developed based on the electrolyte leakage method ((R(2) + R(1))/2, where R(1) is the minimum % electrolyte leakage from noninjured tissue and R(2) is the maximum % electrolyte leakage at the highest injury) that reliably predicted freezing stress resistance of pine needles for most of the year. Important aspects for developing a successful index of injury for pine needles are: use of cut needles, vacuum infiltration and shaking during incubation in water.We conclude that: (1) during cold acclimation the cell wall properties of the pine needles changed and these changes, which appeared to differ in the two species, might explain the very low leakage of electrolytes from winter-hardy needles of red pine; (2) pine needles survive winter by developing the ability to tolerate extracellular ice formation, because after rapid freezing the needles were severely injured; and (3) red pine is adapted to a shorter growing season and colder winters than Austrian pine.