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珍贵树种种类繁多 ,生物学特性各不相同 ,种子贮藏的方法也各异。一般具有假种皮的种子、浆果状核果、核果及大粒种子 ,如珙科、伯乐树科、三尖杉科、木兰科、罗汉松科、银杏科、胡桃科、五加科等 ,宜润砂贮藏 ;而小粒、带翅种子如连香树科、桦木科、榆科、金缕梅科、杉科等宜干藏。当然有些种子既可润藏又可干藏。一、润砂贮藏1、贮前准备 :一是应选择清洁通风良好 ,不当西晒的房子或地下室 ,也可砌做高出地面的砂床 ,上盖荫棚或做成 1米高的弓形塑料棚 ,若温度超过 2 0摄氏度 ,则将薄膜棚的两头揭开。二是去脂处理。润藏的种子 ,有些需… 相似文献
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杜仲是珍贵的中药材,其种子发芽率较低,为提高发芽率,进行了不同贮藏方法及发芽条件试验。试验结果表明,以用混沙湿藏(种沙比为3:5)效果最好,种子室内发芽率为68.9%,场圃发芽率为58.3%,比用布袋和混沙干藏高。 相似文献
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不同贮藏条件对米老排种子含水率和萌发特性的影响 总被引：1，自引：0，他引：1
《林业实用技术》2016,(8)
通过设置真空铝箔袋、瓦罐和布袋3种封装材料和-20、-5、4、10℃和室温5种贮藏温度等15个组合,研究不同贮藏条件对贮藏6个月米老排(Mytilaria laosensis Lecomte)种子含水率和萌发特性的影响,以筛选最佳种子贮藏方案。研究结果表明,不同封装材料和贮藏温度对米老排种子含水率和萌发特性具有显著影响。布袋封装时,5种贮藏温度的种子含水率平均为9.61%,发芽率平均为21.5%;瓦罐封装时,种子含水率为11.48%,发芽率为15.8%;而真空铝箔袋封装时,种子含水率高达16.90%,发芽率基本为0。对于贮藏温度,4℃和10℃贮藏的种子发芽效果较好,-20℃和-5℃的效果一般,而常温贮藏的效果最差。不同封装材料和贮藏温度对种子含水率和种子萌发特性具有一定的交互作用,采用布袋或瓦罐封装在4℃和10℃进行冷藏的贮藏条件最佳,其贮藏6个月的种子发芽率约为30%,为新鲜种子发芽率的40%左右。种子含水率与种子发芽率具有较强的关联,其关系大致呈尖峰状分布,适宜的种子含水率有利于保持种子活力,从而促进种子发芽。综合分析,采用布袋或瓦罐封装在4℃和10℃进行冷藏的贮藏条件最佳,其贮藏效果最好。 相似文献
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为了探寻水杉种子贮藏的适宜含水量、温度和时长，以期为水杉种子的科学贮藏提供参考。本研究以水杉原产地湖北省利川市忠路镇小河村的原生水杉母树上采收的种子为试验材料，通过不同种子含水量、贮藏温度和贮藏时长试验，比较了入库和出库时种子发芽率、发芽势的变化规律。结果表明：种子含水量在10.00%～10.99%时，贮藏期间种子发芽率、发芽势的降低值最小，贮藏效果最佳。种子含水量为10.00%～10.99%,在-5℃贮藏1 a时，发芽率、发芽势降低值最小，贮藏效果最佳；-5℃贮藏1 a、2 a、3 a时，种子的发芽率、发芽势无显著性差异。因此，水杉种子贮藏入库含水量应控制在10.00%～10.99%,贮藏温度推荐-5℃,在-5℃条件下可以贮藏3 a。 相似文献
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为了研究黄檀种子超干贮藏的适宜含水量,采用人工老化法研究超干贮藏对黄檀种子发芽率及生活力的影响。通过对含水量为2.4%~12.1%老化黄檀种子的发芽率、发芽势、发芽指数、活力指数以及电导率等指标的检测,结果表明黄檀种子含水量(MC)降至4.5%,能显著提高抗老化劣变的能力。在同等老化处理(50℃,15 d)后,未超干种子(MC=12.1%)完全失去了发芽能力,而超干种子(MC=2.4%~4.5%)的发芽率仍保持在64%以上。电导率测定结果表明,超干种子经回水处理后细胞膜系统的完整性良好。 相似文献
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油松等供试种子在室内密封干藏条件下,原种子含水量越高,其发芽率越低,1—2年内,保存合格种子的最佳安全含水量分别刊为:油松7％,落叶松6.1—8.5％、侧柏8.6％,海棠8％。同时,供试种子发芽率还随贮藏年限的延长,呈现最佳安全含水量渐低的趋势。为保存合格的种子,油松4—5年内最佳安全含水量为6—5％,落叶松(4年)7—6％,侧柏(6年)7—5％,海棠(6年)2.4％。 相似文献
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针对青钱柳种子种皮致密、坚硬、不易透水,从而影响种子生命力的特点,采用5种贮藏方法和人工被迫催芽方法进行研究,从而提高种子的发芽率和苗木的生长质量。试验结果表明:室外沙藏的种子发芽率最高,可以达到94%,高于其它4种贮藏种子,未发芽率和种子霉烂率与其它4种贮藏种子相比都明显偏低;地栽秋播的种子发芽最早,种子出芽整齐;常温干藏的种子,未发芽率达到4%,霉烂率最高达到47%,与其它4种贮藏种子相比最差。 相似文献
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Juniperus procera Endl. is economically important timber species, but its populations are extremely small and fragmented in its natural habitat, thus, calling for immediate ex situ conservation. Here we examined the effects of seed sources and storage temperature on the longevity of Juniperus procera seed lots through collection and preservation of seeds in seed banks. Seeds were collected from nine sites across the species natural distribution in Ethiopia and stored in four warehouses: modern cold room (5℃), mud house (15℃), concrete block house (17℃ or corrugated iron house (20℃) for 42 months. Every three months, a random sample of stored seeds were drawn and tested for germination. A highly significant variation (p < 0.01) in germination of stored seeds was observed among different storage environments, seed lots, and duration of storage. Over the storage period, seeds stored in the cold room had the highest mean percentage germination, followed by the mud house, corrugated house and blocket house. The cold room (41%) and the mud house (38%) maintained the same level of germination as the intitial germination of the seedlotds (42%). The variation in longevity of stored seeds was significnatly correlated with the initial germination of seed lots (r > 0.80; p < 0.01). Cold storage also resulted in enhancement of germination through its stratification effect that terminated the non-deepphysiological dormancy of juniper seeds. In conclusion, seed lots with good initial germination can be effectively stored in cold room (5℃) up to four years. In the absence of modern cold stores, mud houses can be used as a good alternative to store seeds at local level. 相似文献
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苗木储藏是对远距离、短期集中造林成功的一种较好的措施.本文介绍的窑藏新方法和采取的管理措施可达到这一目的. 相似文献
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辽宁新宾县森林碳储量研究 总被引：2，自引：0，他引：2
利用2009年森林资源变档数据,建立不同树种(组)生物量与蓄积量之间的回归方程,对新宾县森林碳储量进行估算。结果表明:新宾县森林总碳储量1 476.86万t,栎林和落叶松林碳储量占78.0%,幼中林碳储量占65.9%,全县森林平均碳密度48.90 t.hm-2。 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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依据全国碳汇专项调查的理论和方法,对福建省霞浦县不同林龄阔叶混交林生态系统各组分的碳、氮含量及碳、氮储量格局进行调查分析,结果表明:灌木层各器官碳含量从大到小依次为枝干根叶,氮含量为叶干根枝;草本层碳、氮含量从大到小均为地上部分地下部分;土壤碳、氮含量均随土层深度增加而降低,随林龄的增大而上升;系统各组分C/N从大到小依次为枝根干枯落物叶土壤;12年生、19年生和28年生阔叶混交林生态系统的碳储量分别为164.066、231.751和290.985t!hm-2,氮储量分别为15.011、23.503和31.236t!hm-2,其中,土壤层碳储量所占比重分别为60.27%、46.50%和39.50%,氮储量所占比重分别为45.94%、33.09%和28.67%;乔木层、灌木层、枯落物层和土壤层碳、氮储量均随林龄的增大而增加。 相似文献
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Deborah S. Page-Dumroese R. Kasten Dumroese Martin F. Jurgensen Ann Abbott Jennifer J. Hensiek 《Forest Ecology and Management》2008
After five years of growth at high-elevations (∼3000 m) in Utah, container lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.) seedlings survived well (80–95%) and grew to similar heights regardless of nursery storage method and site preparation technique. Seedlings received one of three storage treatments: (1) spring-sown in the nursery, overwintered in cooler storage and outplanted in July; (2) spring-sown, overwintered in freezer storage, and outplanted in July; or (3) winter-sown, no storage, and hot-planted in late August. We outplanted seedlings at two locations that were clearcut and had received two treatments of surface organic matter (coarse wood, logging slash, and forest floor) removal: surface organic matter (OM) piled with a bulldozer and burned or surface OM remaining in situ. Compared to adjacent uncut stands, both site preparation treatments increased total soil bulk density, but retaining surface OM in situ maintained soil OM, carbon, and nitrogen levels. After one growing season, seedlings planted where surface OM had been bulldozed were taller and had more biomass, although survival was similar (≥96%) across site preparation treatments. The height growth advantage disappeared after five growing seasons and although overall survival was good, survival was highest where site preparation involved removal of surface OM and freezer-stored seedlings were planted. Total non-structural carbohydrates tended to be higher in roots than in shoots and were also higher in hot-planted seedlings than in stored seedlings. Our results indicate that nursery and forest managers have several options for successful nursery production and outplanting of container lodgepole pine seedlings in the central Rocky Mountains. Using hot-planted seedlings allows for a faster turnaround time (from seed to plantable seedling) and maintaining surface OM may be a cost-effective alternative to dozer piling and burning. 相似文献