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范建生 《内蒙古林业调查设计》2013,36(2):112-113,120
北方高寒地区一年中有7个半月的寒冷期,不利于花卉生长和储藏,花窖在北方高寒地区显得尤为重要。文章就此次花窖设计对高寒地区花窖设计改良进行经验总结。根据理论分析及生产实践经验,对牙克石市最佳前屋面角,后屋坡仰角,花窖前屋面的棚面设计,花窖脊高,整体方向位,墙体厚度,防寒沟等方面进行了优化设计。 相似文献
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随着人民生活水平的不断提高,对绿化、美化、香化的树种、花卉的需求量也越来越大,但由于有些观赏的树种、花卉,育苗难度大,苗木供应紧张,远不能满足社会的需要。为此,省林木种子公司于1983年曾组织部分苗圃的科技人员,参观、学习了林荫窖棚育苗技术,并在祁县、闻喜、晋中地区苗圃推广应用,取得了较好的效果。现将这一技术介绍如下。一、林荫窖棚的设置林荫窖棚一般设在河边、渠旁、宅旁的林间空地,选择土壤湿润处。先挖一个上口宽3米、底宽1.5米、深1.5~1.8米的窖,四周窖壁呈斜面,坡度为65~70度,横断面呈倒梯形,长度可根据条件和需要而定,一般以3~10米为宜,方向南北,在窖底中间纵向挖一宽30厘米、深20厘米的小沟作为步 相似文献
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<正> 林荫窖棚是建在林荫下的地下式的塑料棚,利用它扦插培育某些难生根成活或缺少种子的珍贵树种苗木、花卉,是一个管理方便,经济实用,投资小收益大的好方法。现将林荫窖棚的修建及嫩枝扦插技术简介如下: 相似文献
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红富士苹果家庭贮藏五法马成战1、土窑洞或土窑窑法:土窑窖结构由窖筒、窖身、通气孔三部分构成。窖筒口径0.6—0.8米,深5米左右,窖宽2米,平均高1.5—2米。长度根据需要和地形而定,一般5—10米。窑顶尖拱形,窖顶中部低而两端渐高,以利通风。窖底嵌... 相似文献
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连栽杨树人工林碳储量变化 总被引:1,自引:0,他引:1
为研究连栽杨树人工林林木和土壤碳储量变化规律,了解杨树人工林碳汇能力,笔者对江汉平原1代和2代杨树人工林的林木生物量和碳储量、土壤碳含量和碳储量进行了测定,结果表明:1代和2代杨树人工林林木碳储量分别为30.83 t/hm2和24.63 t/hm2;土壤碳储量(0~20 cm)分别为39.29 t/hm2和29.09 ... 相似文献
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通过对刺槐冷藏苗和非冷藏苗开展造林试验,观测和分析造林当年和次年苗木成活率、萌芽成枝力、新梢生长量、基径和苗高,研究了刺槐经冷藏处理的裸根苗造林效果。结果表明:刺槐苗木经冷藏处理后造林,能非常显著地提高成活率、萌芽成枝力、新梢生长量、基径和苗高等指标。 相似文献
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《Scandinavian Journal of Forest Research》2012,27(5):415-421
This study examined the effects of low-temperature storage of white spruce [ Picea glauca (Moench) Voss] bareroot seedlings to determine whether the time between lifting and planting of spring-lifted seedlings could be extended. Seedlings were lifted from the nursery beds on May 4, 1994, and stored at- 2C (frozen storage) and 4C (cold storage) for 3, 5 and 7 weeks. Frozen storage of spring-lifted seedlings resulted in an increase in sugar levels in roots and needles that progressed with storage duration. Seedlings stored in cold storage maintained a relatively constant sugar content. Needle starch content decreased with storage duration in both frozen and cold storage. In the roots of cold-stored seedlings, starch content remained relatively constant during storage; however, in the frozen-stored seedlings, root starch levels sharply declined during the initial 3 weeks of storage. The levels of total non-structural carbohydrates (starch and sugars) decreased in both types of storage in needles, but not in roots. However, the decrease was more pronounced in the cold-stored than in the frozen-stored seedlings. Gas exchange, root growth potential and number of days to bud break were similar in frozen- and cold-stored seedlings planted in the greenhouse. However, following planting in the forest, cold-stored seedlings flushed buds earlier than did frozen-stored seedlings. The results indicate that tree nurseries could consider frozen storage of spring-lifted white spruce seedlings to facilitate lifting and planting schedules. 相似文献
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山西省森林植被碳储量及其动态变化研究 总被引:3,自引:2,他引:3
以山西省1995年、2000年和2005年的3期森林资源清查数据为基础,采用生物量换算因子法,研究了山西省森林植被碳储量及其动态变化。结果表明:10年间山西森林的碳储量总体呈上升的趋势。全省森林的总碳储量由1995年的3514.22万Mg增加到2005年的4505.61万Mg。在14个(类)森林优势树种中,栎类、油松和杨树这三者的碳储量占主导地位,合计占山西省森林总碳储量的60%以上。在全部森林中,幼、中龄林及近熟林的碳储量合计约占总量的90%。2005年,人工林碳储量占森林总碳储量的百分比提高了5.28%,全省森林平均碳密度为23.8933~26.3717Mg/hm2。 相似文献
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The effect of warm storage (15°C) for 0, 15 or 31 days, applied after cold storage until April, and date of lifting to cold
storage on the physiological condition and field performance of two-year-old oak seedlings (Quercus robur L.) was investigated. Assessments before planting included plant moisture status, root and shoot dry weight, root growth
potential (RGP), while after planting root growth, shoot growth phenology, shoot and root dry matter accumulation and stem
quality were assessed. Warm storage effects were large, but lift date effects were small. Warm storage for 31 days reduced
height and diameter growth, stem quality, total biomass, root growth, and reduced stem quality in the field, but 15 days storage
had a smaller effect. Warm storage delayed bud break and shoot growth cessation but survival was unaffected. The depletion
of food reserves during storage and low moisture availability might have caused shoot dieback leading to the development of
poor quality stems. There was evidence that dry weight fraction of both the shoot tip and the taproot provided good information
on the quality of the stock before planting. RGP was also a good indicator of quality. Electrolyte leakage readings from fine
and taproots were not reliable indicators of plant quality. 相似文献
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研究52 个乔木树种纯林的碳储量,分析其固碳能力差异,为碳汇造林选用乔木树种提供参考
依据。以广东省东江林场11 年生的乔木树种试验林为研究对象,测定52 个树种生长量和树干、树枝和
树叶的含碳率。按照平均木法,算出平均木生物量,结合平均含碳率、林分密度与保存率,估算碳储量。
结果表明,不同树种林分碳储量差异极大,最高碳储量(厚荚相思Acacia farnesiana)比最低碳储量(紫
玉兰Magnolia liliiflora)相差约20 倍,年均碳储量在10 t/hm2 以上的树种有含羞草科的厚荚相思、大叶
相思A. auriculiformis 等5 个树种,年均碳储量在5~10 t/hm2 的有灰木莲Manglietia glanca、红荷Schima
wallichii 等18 个树种。以保存率和单位面积碳储量2 个主要性状作聚类分析,可将52 个树种按固碳能力
划分成4 种类型的碳汇树种。 相似文献
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