共查询到19条相似文献,搜索用时 125 毫秒
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通过测定梅花鹿林下养殖林地土壤的容重、总孔隙度、含水量、全氮、全磷、速效磷和速效钾等物理化学指标,确定梅花鹿养殖对林地土壤理化性质的影响及干扰程度,并探究土壤对梅花鹿林下养殖干扰的响应。研究发现随着梅花鹿林下养殖密度的增大,林地土壤容重随之增加,孔隙度减小,含水量降低,土壤中全氮、全磷、速效磷、速效钾含量呈现先增加后随之减小的现象。梅花鹿养殖区域林下土壤的理化性质的变化受到梅花鹿养殖及其密度影响,适度的放养有利于土壤物理性质的改善,增加土壤营养成分的沉积。养殖密度一但超过承载量,将造成土壤的物理性质下降以及营养成分的流失。 相似文献
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特畜养殖品种如梅花鹿、马鹿、小尾寒羊、肉狗、肉兔、小型猪、香猪、麝鼠、海狸鼠、果子狸、竹鼠、蛇、蛤蚧等在我国已经形成一定规模。梅花鹿、马鹿受国外市场冲击,使我国自产的鹿茸及其制品销售受阻。因此,不宜盲目发展。小型猪、香猪、麝鼠、海狸鼠、竹鼠等养殖品种由于前几年被炒种者炒作,挫伤了养殖者的养殖积极性,消费市场和加工相对滞后,全国存量逐渐减少,预计年养殖前景相对看好。果子狸属于国家保护动物,目前多为暂养,不宜大量发展。过去几年肉鸽一直看好,市场平稳,肉鸽养殖趋向稳中有升, 相似文献
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文章阐述梅花鹿的形态特征及生活习性以及阿尔山市国有林区梅花鹿资源现状。重点阐述了梅花鹿资源的保护和繁育措施,以利于该地区梅花鹿种群数量的递增。 相似文献
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In this paper we report the results of a study on the suitability of the dehesa (Mediterranean woodlands) as habitat of red deer (Cervus elaphus hispanicus) in a closed country estate of about 4300 ha total surface situated in the San Pedro Mountain, in Central Extremadura, Spain. We have described the deer management with respect to habitat, exploitation mode, deer feeding, population control and production of goods and services. It is concluded that the dehesa system is a rich natural resource that preserves and improves the degraded environment.
Abbreviations CS collected surface - DMFCU deedmixed feed cattle units - Fi final inventory - FS fertilized surface - Ii Initial inventory - K Potassium - N Nitrogen - NBF number of breeding females - NBFIi number of breeding females of initial inventory - NBFR number of breeding females released - NBM number of breeding males - NBMIi number of breeding males of initial inventory - NBMR number of breeding males released - NCCR number of captive calves released - NCFi number of calves of final inventory - NCR number of calves released - NFR number of female renovation - NYMR number of young males released - NYFR number of young females released - P phosphorus - PP permanent Pastures - pts pesetas - QS Quercus stalks - RDED resources directly eaten by deer - SPOM selected hunted down poor quality males - SS sowed surface - TN total needs of deer - TNR total number released - UAS useable agrarian surface - WB wooded brush - WQS wooded Quercus surface - WS wooded surface 相似文献
Resumen En el presente trabajo se estudia la dehesa como hábitat del ciervo (Cervus elaphus hispanicus). Se ha tomado como referencia una finca cerrada de 4300 ha de ST situada en la Sierra de San Pedro, en Extremadura, España. Se describen los sistemas de gestión actuales del ciervo en cuanto a hábitat, modo de explotación, alimentación, control de población y producción de bienes y servicios. Concluyendo con la necesidad de fomentar este tipo de explotaciones cinegéticas de dehesa que ayudan a conservar y potenciar el medio ambiente en zonas despobladas y deprimidas
Abbreviations CS collected surface - DMFCU deedmixed feed cattle units - Fi final inventory - FS fertilized surface - Ii Initial inventory - K Potassium - N Nitrogen - NBF number of breeding females - NBFIi number of breeding females of initial inventory - NBFR number of breeding females released - NBM number of breeding males - NBMIi number of breeding males of initial inventory - NBMR number of breeding males released - NCCR number of captive calves released - NCFi number of calves of final inventory - NCR number of calves released - NFR number of female renovation - NYMR number of young males released - NYFR number of young females released - P phosphorus - PP permanent Pastures - pts pesetas - QS Quercus stalks - RDED resources directly eaten by deer - SPOM selected hunted down poor quality males - SS sowed surface - TN total needs of deer - TNR total number released - UAS useable agrarian surface - WB wooded brush - WQS wooded Quercus surface - WS wooded surface 相似文献
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《Scandinavian Journal of Forest Research》2012,27(2):148-153
Abstract In Norway, a positive relationship between spring numbers of lesser spotted woodpecker (Dendrocopos minor) and previous June temperatures has been interpreted as an effect of temperatures on woodpecker survival and reproduction during the breeding season. This article considers the possibility that woodpecker numbers are related to the abundance of the moth Argyresthia goedartella in the current year. Larvae and pupae of A. goedartella are important food for lesser spotted woodpeckers in early spring when few other surface-living invertebrates are available. The occurrence of this moth depends on the flowering of birch (Betula spp.) and alder (Alnus glutinosa), which in turn is influenced by June temperatures in the preceding year. Spring numbers of the lesser spotted woodpecker in two regions of Norway were compared with a trapping index of A. goedartella and weather variables assumed to influence the woodpeckers’ breeding success and adult survival. The best multiple regression model included December temperatures and moth indices, supporting the hypothesis of a strong impact of A. goedartella on spring survival. Conservation strategies for the lesser spotted woodpecker should therefore focus not only on minimum areas of deciduous forests with decaying wood, but also on the availability of the moths’ host trees, birch and alder. 相似文献
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从介绍野猪生物学特性入手,阐述云南省野猪产业的现状以及发展该产业的自然条件、政策法规、科研技术和产业基础等优势,分析云南省野猪产业存在的养殖规模小、技术欠缺、产品附加值低、监管不完善及宣传不到位等问题,提出了选育优良品系、科学养殖、扩大产业规模、提高产品附加值、保证产品质量、拓宽销售渠道、扶持龙头企业以及加强政策宣传等促进产业发展的对策。 相似文献
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Ulrika A. Bergvall Michelle Co Roger Bergström Per J. R. Sjöberg Monica Waldebäck Charlotta Turner 《European Journal of Forest Research》2013,132(5-6):717-725
A major problem within forest industry is unwanted browsing on seedlings from mammalian herbivores. The aim of this study was to evaluate the effects of birch bark extracts as repellents towards fallow deer. Birch bark was extracted in a conventional way with ethanol as solvent at ambient temperature and with a new method, liquid CO2 extraction. An analysis of the ethanol-extracted birch bark showed that it contained large amounts of terpenoids, of which the most abundant was betulin. In seven different treatment trials, we used 15 individually handled fallow deer. To investigate the binary taste preferences, birch bark extract was added to food and presented in two bowls in typical two-choice tests. We found that the amount of a food type consumed during a trial and the number of shifts between food bowls were dependent on the amount of the birch extract the food contained. Concentrations of above 1 % by dry weight of birch extract acted as a repellent. In addition, such concentrations produced shorter feeding bouts by a greater willingness to change bowls. Therefore, our conclusion is that birch bark extract acts as a repellent towards fallow deer and is therefore likely to act as a repellent against other deer species. In addition, we show that birch bark extract produced by the new and more environmentally sustainable method employing liquid CO2 mixed with ethanol has the same repellent effect as the traditional ethanol extraction. 相似文献
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The intensity of deer herbivory, rather than simply the deer population density, directly affects the forest ecosystem, but a linear relationship between these two factors has generally been assumed. To assess their relationship, we investigated deer population density and tree sapling vegetation in six forests with different deer density on Yakushima Island, Japan. The feeding frequency was used as an index of deer herbivory. Palatable saplings showed high feeding frequency and became rare in deer-abundant areas, while unpalatable saplings showed low feeding frequency and increased with increasing deer density. In addition, feeding frequency on sapling vegetation did not continue to increase with increasing deer population and was limited to only 0.24-0.32 in deer-abundant areas (more than 20 deer/km2). These data suggest that deer shift their main food items from living palatable saplings to other alternatives such as litter fall rather than living unpalatable saplings. Clearly, the nonlinear relationship between deer density and deer herbivory on forest vegetation could result from a change in the food eaten by deer, and it is therefore necessary to assess the impacts of deer based on not only the size of the deer population but also the intensity of direct herbivory. 相似文献