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为测定野生和种植黑果枸杞中原花青素、维生素B1、多糖的含量,给种植黑果枸杞的研发提供依据。采用盐酸-正丁醇法测定了黑果枸杞中原花青素的含量,荧光法测定了维生素B1的含量,苯酚-硫酸法测定了黑果枸杞的多糖含量。结果表明:种植黑果枸杞的原花青素、维生素B1、多糖的含量高于野生黑果枸杞。且种植黑枸杞原花青素含量高于野生黑枸杞的1倍。5个种植区黑枸杞3个指标含量有差异。种植黑果枸杞与野生黑果枸杞原花青素、多糖、维生素B1含量比较是升高趋势,种植黑枸杞成分含量存在地区差异,提示种植黑果枸杞时需要选择适合的种植区。 相似文献
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枸杞的利用价值、栽培技术及产业化开发 总被引：10，自引：0，他引：10
枸杞是一种重要的中药材,具有丰富的营养和广泛的药用价值,又是一种很好的水土保持树种,在我国干旱地区具有良好的发展前景。采用集约化栽培技术能大幅度提高其产量和质量。我国在枸杞的产业化开发方面走在世界前列,在栽培技术研究和品种选育及系列化产品开发方面取得了显著的成绩。 相似文献
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为解决黑果枸杞种子萌芽率低、前处理时间长及造林管理技术落后的问题,本文采用1%的KNO_3溶液对黑果枸杞种子进行前处理,并对其高效育苗技术及造林管理技术进行了研究。结果表明,1%的KNO_3溶液可促进黑果枸杞种子萌芽,提高出苗率;黑果枸杞育苗时温室环境调控下采用基质可确保成苗率;黑果枸杞造林树体管理中,可将生态效益与经济效益有效结合起来,即在修剪时可将结果量大的枝条剪下来以采集黑果枸杞果实,但是所剪结果枝条不能低于其总枝条数的50%,以促进黑果枸杞枝条更新,这样既可确保其生态效益,又可适当增加经济效益。 相似文献
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枸杞木虱天敌瓢虫的种类调查及鉴别 总被引：2，自引：0，他引：2
枸杞木虱(Trioza.sp)是枸杞上主要害虫之一。成虫、若虫都以刺吸式口器刺吮寄主汁液,致使树势衰弱,早期落叶,严重时2～3年可毁园。为此,我们对枸杞上主要害虫的天敌进行了田间系统调查及室内饲养观察和鉴定,肯定了8种常见木虱的天敌瓢虫。1 调查采集和饲养观察1.1 调查采集从3月下旬枸杞上发生木虱始至6月底止,每隔15天到枸杞园采集一次瓢虫,进行种类、数量记载。1.2 取食习性观察 相似文献
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本文通过对半干旱黄土区水平梯田内人工引种栽植野生黑果枸杞与原产地野生黑果枸杞生长状况的比较,确定黑果枸杞生长变化及其对土壤水分的影响。结果表明：（1）水平梯田内引种栽植7年的黑果枸杞植株下0—100 cm土壤水分含量显著高于植株间,野生黑果枸杞植株下和植株间0—100 cm土壤水分含量相差较小;（2）水平梯田内引种栽植7年的黑果枸杞其株高、冠幅、冠幅体积和分枝数均显著高于野生黑果枸杞,人工栽植黑果枸杞其株高和冠幅分别是野生的4.4倍和4.5倍,同时人工栽植黑果枸杞其地上、地下生物量和根冠比均显著高于野生黑果枸杞;（3）野生黑果枸杞地上和地下生长量均与0—100 cm土壤水分呈负相关,且0—100 cm土壤水分含量显著影响了野生黑果枸杞的株高和冠幅;人工栽植黑果枸杞生长量与0—100 cm土壤水分含量也呈负相关,但相关性较小。半干旱黄土区水平梯田栽植黑果枸杞可快速、稳定生长,并可提升植株下表层土壤水分含量,研究结果为黑果枸杞在半干旱黄土区退化人工林草地修复改造及推广利用提供参考依据。 相似文献
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报道了桉树上的1种重要刺吸性害虫——桉树芽木虱Blastopsylla barbara Li。该虫在广西南宁全年有2个危害高峰期,分别为3月上旬至5月下旬和9月上旬至11月下旬。在5月室外平均气温26.42℃条件下,全世代发育需15～18 d。卵期6～7 d,1龄若虫期1～2 d,2龄若虫期3～4d,3龄若虫期约1 d,4龄若虫期1～2 d,5龄若虫期2～3 d,成虫产卵前期6～8 d。不同药剂防治试验表明,50%烯啶虫胺20 000倍液喷雾,24 h后防治效果达90%以上,70%吡虫啉25 000倍液或5.4%阿维菌素5 000倍液喷雾,72 h后防治效果达70%以上。 相似文献
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退耕地是具有一定高度和坡度的特殊土地体系，受地形因素和自然规律的综合作用，孕育了经营模式上的多样性和复杂性。在分析四川水土流失现状和退耕还林工程总体布局的基础上，设计退耕还林经营模式，从宏观上提出特殊区域地方特色的退耕还林模式，以指导退耕还林工程。 相似文献
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In the água de Gato Watershed on the island of Santiago (Cape Verde Islands), 51 farmers were surveyed for their willingness
to plant trees on their farms for various purposes. Farmer and farm demographic data were also collected to determine those
characteristics associated with willingness to plant. Ninety-two percent of the farmers surveyed expressed a willingness to
incorporate more trees into their farming practices, and the remainder indicated they were unsure. Linear discriminant analysis
was used to relate the demographic variables to willingness groups to plant trees for fruit, fuelwood and shade. Discriminating
variables were found to include farmer age, gender, marital status, family size, and farm area (owned, rented or farmed in
partnership). Interactions were also observed between the various use categories. For example, farmers who were willing to
plant trees for fuel were also more willing to plant trees for shade, and farmers who were willing to plant trees for fruit
were unwilling to plant trees for shade. Discriminant analysis models were developed that accounted for correct classifications
ranging from 63% to 88%, and averaging 75%. 相似文献
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开花苦竹的复壮技术 总被引：3，自引：0，他引：3
本文是大面积开花苦竹Pleioblastus spp.复壮技术试验的总结。经过1984—1988年5年的试验,取得了明显的效果,试验结果表明:1.削草松土加施尿素是苦竹复壮最有效措施,试验第五年(即1988年)的新竹,木苦竹(PL.amarus(Keng)Keng t.)每亩立竹量达3196株,平均地径2.09厘米,平均高度445.8厘米,蓄积达2237.2公斤,与封山育竹12年的竹林比较,立竹量增长4.74倍,蓄积量增长7.48倍;同期,青苦竹(PL.amarus var PendulifoliusS.Y.Chen)立竹量每亩比封山12年的竹林增长2.462倍,蓄积量增长2.13倍。2.削山松土是苦竹提前复壮的基本措施。采取这一方法,5年就可使竹林恢复正常生长,其88年木苦竹每亩立竹量达到1908株,平均地径1.77厘米,平均高度395.7厘米,蓄积达954公斤,比封山12年的竹林每亩立竹量增长2.831倍,蓄积量增长4.04倍;同期,青苦竹立竹量比封山12年的竹林每亩增长1.657倍,蓄积量增长1.289倍,复壮时间可比封山提前5—6年。 相似文献
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《Journal of Sustainable Forestry》2013,32(1):23-46
Abstract Forest sustainability has emerged as a crucial component of all current issues related to forest management. The seven Montreal Process Criteria are well accepted as categories of processes for evaluating forest management with respect to sustainability, and data collected by the Forest and Inventory Analysis (FIA) program of the United States Forest Service are well suited for such evaluations. The FIA program focuses on the collection, analysis, and distribution of data for a core set of variables obtained using a plot configuration, a sampling design, and measurement protocols that all feature national consistency. Plot, subplot, and tree-level observations include traditional mensurational measurements such as forest area, tree species, diameter, and survival and a suite of non-tree measurements related to the health of the forest. FIA data are recognized for their completeness, geographic coverage, and accessibility to users via a user-friendly interface to a national database. Three examples for three different regions of the United States illustrate the relevance and utility of FIA data for environmental and ecological assessments in the context of the Montreal Process. Several conclusions may be drawn from the examples: (1) for the Southern region, the forest land base is stable, and growing stock volume is increasing; (2) for the Mid-Atlantic region, contributions to carbon accumulation are slightly greater than for storage, and storage increases from north to south; and (3) for the Central Hardwoods region, tree species richness increases from north to south and from west to east and is stable or slightly increasing. 相似文献
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针对国有林场现状以及森林资源监管需求，构建了国有林场森林防火和资源监管“空天地人”四位一体监测系统体系框架，提出了“空天地人”四位一体监测平台建设架构及建设内容。旨在通过构建立体化资源监管体系，弥补传统监管方式的不足，提高国有林场信息化现代化水平，为增强国有林场森林生态功能，推动国有林场森林资源总量持续增加提供科技支撑。 相似文献
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There is an urgent need to standardize the methods used to assess the growth of multipurpose trees. Most of the standard methods so far described have been developed specifically for use in multilocational trial networks. This paper was prepared for the F/FRED/ICRAF Workshop on MPTS Assessment Methods, held in Thailand in May 1991 to develop internationally-recognised standards for assessment methodology. It critically reviews the methods prescribed by different networks for height and diameter measurement, and for biomass estimation, giving researchers a range of methodological options to consider and re-emphasizing the need, all too often neglected, to define assessment methods clearly and unambiguously. 相似文献
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中国造纸产业原料基础薄弱因而高度依赖纸浆进口, 降低进口风险、实现进口的多元化是保障产业稳定发展的重要议题。文中借鉴能源供给安全指数建立了纸浆进口风险指数和结构优化模型, 用以评价中国纸浆进口风险状况以促进进口更加多元化。对进口风险评价结果表明, 木浆的进口风险整体变化平稳、波动幅度较小, 废纸的进口风险呈下降趋势。对纸浆进口结构优化分析结果说明, 通过调整进口各国纸浆的数量可以有效降低进口风险。造纸产业应分散进口来源、降低进口集中度、减少从高风险国家的进口量以降低木浆和废纸的进口风险, 实现纸浆的稳定供给。 相似文献
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《Wood material science & engineering》2013,8(3):188-197
Abstract Joints are generally the weakest part of furniture and they are primary cause of failure. To ensure durability and performance of furniture, it is important for a designer to understand the stresses acting on the joints for preparing suitable design and specification of a furniture. Since each type of joint is unique in construction, it is important to know their strength, when subjected to various stresses namely shear, bending, and tensile, by testing the joints. Since there is no established test method for joints, this study was carried out to categorize joints based on their shape, identify the stresses acting over them and develop test methods for testing furniture joints in three modes namely shear, bending, and tension, which are required for designing joints of any furniture and also provide means of comparing strength of different types of joints. Different types of furniture joints were taken for the study and were classified based on their shapes such as L-shaped, T-shaped, straight, and corner joints. Six types of jigs (one type for bending, two types for shear, and three types for tension) were designed and developed for testing the joints, in such a way that any type of joint can be tested in three modes, i.e., bending, shear, and tension using a universal testing machine. The criteria for section of jigs for performing tests on joints, based on their shape and stresses acting on a particular joint, were reported. Tests were carried out using all the six type of jigs to check the suitability of jigs and test methods developed in the study. 相似文献