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沙柳集束沙障固沙技术探讨 总被引:4,自引:0,他引:4
风蚀沙埋是制约沙区人工造林成活率的主要因子之一。设置沙障是防止风蚀沙埋,提高造林成活率的主要措施。本文通过对沙区人工造林设置不同类型沙障的对比试验,筛选出沙柳集束沙障。该沙障具有明显的效益,可在高大流动沙区人工造林中加以推广。 相似文献
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干旱荒漠区白刺造林试验研究 总被引:1,自引:0,他引:1
选择不同立地条件、ABT蘸根处理在干旱荒漠区开展白刺造林试验,其结果表明:(1)白刺在不同立地类型上造林成活率大小依次为:草沙障地、半固定沙丘、流动沙丘和固定沙丘、沙埋滩地、滩地;流动沙丘设置草方格沙障造林效果较理想,当年成活率65.5%;其次为半固定沙丘,成活率64.8%。(2)ABT生根粉处理的苗木比对照苗木(CK)当年成活率提高15%;成活率最高的是ABT3-150,成活率61.5%;ABT生根粉不同剂量处理效果为:ABT3-150>ABT3-100>ABT2-150>ABT1-100>ABT3-250。(3)影响白刺人工造林成活率的因素有立地类型、沙丘水分、风蚀危害、苗木处理、补水次数等。 相似文献
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沙地沙棘苗冷藏造林技术研究 总被引:1,自引:0,他引:1
赵跃 《内蒙古林业调查设计》2009,32(3):39-41
为了提高半干旱区沙漠化土地的造林成活率与保存率,文章对一年生沙棘苗进行了冷藏处理和造林抚育试验。试验发现:冷藏可以延长苗木的保存期,使造林得以在春季干旱多风季节之后进行,避开了干旱与大风对苗木的危害,有效地提高造林的成活率,同时也降低了造林与抚育的成本。与常规造林相比,冷藏苗造林可以节省约50%左右的费用。试验还发现沙棘苗木在冷藏过程中,适度的温度控制以及冷藏后与造林前的常态恢复训练与苗木冷藏处理后质量的好坏有着密切的联系。训练过程中要注意保持一定的湿度,训练应该选择在阴天或阴凉处进行,避免光线直射。人工开沟深坑造林技术也是提高冷藏苗造林成活率的重要技术之一。 相似文献
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栓皮栎是北京地区干旱阳坡比较好的造林树种。为了提高直播造林成活率,1965年我们选在阳坡、半阳坡作了低穴浅播和坐水浅播试验。试验证明,低穴浅播省工、成活率高。后来又发展成低穴浅播覆草圈的方法,成苗效果 相似文献
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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、豆秸覆盖能显著提高土壤养分,锯末、河沙覆盖对土壤养分影响不大;河沙和松针覆盖下的红松出苗率较高,草炭土、锯末、豆秸覆盖下的较低;松针覆盖的苗木生长势最好,豆秸次之,草炭土、锯末和河沙覆盖的较差。 相似文献
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干旱荒漠区沙地云杉幼苗越冬措施效果分析 总被引:1,自引:0,他引:1
在干旱荒漠区,对1年生沙地云杉容器苗在温室和自然条件下分别设置实验,对其越冬措施效果进行了比较分析。在室外条件下对沙地云杉幼苗采用土壤、沙子、塑料、塑料薄膜、麦草、树叶为覆盖材料,同时,对沙地云杉埋土越冬采用了土壤、沙子2种材料,设置了不同的覆盖厚度。研究不同覆盖材料和覆盖厚度对苗木越冬保苗率的影响。研究结果表明:(1)覆土对沙地云杉幼苗的保苗率明显高于覆沙的保苗率,覆土厚度与保苗率关系密切(R2=0.916 4),覆土的厚度为10~15 cm保苗效果最好;(2)各种覆盖材料相比,覆土对沙地云杉幼苗越冬效果最好。 相似文献
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Aspen (Populus tremula) is capable of reproducing both sexually and asexually from root suckers, the latter being more common. Seedlings are rare
even though potential seed production is enormous. The aim of this study was to find out how different moisture conditions
affect emergence and survival of aspen seedlings on burned soil. We set up a sowing experiment on mineral soil and on humus.
The sowing was done at 240 microsites (θ7 cm) in 15 blocks (1×1 m). Treatments were sowing time, watering and sowing shelter.
A total of 1463 seedlings emerged on mineral soil and 26 on humus. Watering, covering, their interaction, block and sowing
time had significant effects on the number of seedlings. The largest numbers of seedlings were recorded at microsites that
were watered and covered. The survival of seedlings was 20% during the growing season and 45% over winter. We conclude that
seedbed conditions and moisture are the most essential factors for sexual reproduction of aspen. Short-term weather conditions
have an important effect on seedling emergence and are likely to greatly affect field studies. 相似文献
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Drought is one of the crucial factors limiting plant growth and is expected to become even more limiting in many regions as the effects of climate change increase. Knowledge of genetic adaptation to environmental factors can help develop strategies for successful reforestation in arid terrain. In this study, Austrian pine (Pinus nigra Arnold) seedlings grown from seed collected from 40 open-pollinated families from five Balkan Peninsula provenances were evaluated for survival and growth under imposed drought. Within each provenance, seed was collected from an extremely harsh habitat and from a favorable habitat. One-year-old seedlings, from each provenance, habitat type and open pollinated family were transplanted into three “stressbeds”, each designed to simulate different levels of water availability by filling with varying ratios of crushed stone and soil. Seedling height growth and survival were recorded every 20–30?days from April–September. In all provenances, seedlings grown from seed originating from the harsh habitats had lower survival regardless of stressbed treatment compared to those grown from seed collected from favorable habitats, with the exception of one population from the Vi?egrad provenance which had high survival rates throughout. Overall height growth was very low and did not follow consistent patterns among treatment groups. Cluster analyses of survival data showed that populations from a similar habitat generally grouped together, regardless of provenance. The lowest and highest survival values were found in seedlings from harsh habitats, while those from the favorable habitats clustered in the mid-range. These results suggest that higher seed quality from productive stands may be the most influential factor determining seedling vigor under drought stress and that genetic adaptation to drought was not detected in adjacent populations having different habitat conditions. 相似文献
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针叶树幼树移栽与容器大苗造林试验 总被引:2,自引:0,他引:2
为了提高半干旱地区针叶树造林的成活率,在内蒙古奈曼旗兴隆沼林场开展了针叶树幼树带土坨移植试验与塑料容器大苗造林试验。结果表明,8年生境子松幼树移植成活率达88% ̄98%;4年生不同树种容器苗造林成话率达76% ̄87%。樟子松容器苗成活率比裸根苗高53%;流动风沙土造林地比生草风沙土造林地高45%。 相似文献
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为寻找岷江柏木最佳的种质资源保存方式,以马尔康市天然起源岷江柏木为对象,从岷江柏木移植试验入手,结合已有的岷江柏木种质资源保存方法,进行了两方面研究:1)探讨了不同移植时间、不同树龄、不同修枝比例对岷江柏木移植的影响。试验共移植216株个体,1 a后成活8株,成活率3.70%。主根发达、须根偏少,土壤贫瘠且砾石含量多,移植施工的直接伤害、移植地环境难以完全相似等因素,直接影响到岷江柏木移植的成活率。2)比较了原地保护、异地移植、采种育苗、存入种质资源库等岷江柏木种质资源保护方式。提出在原地保存不可行的情况下,应优先采取采种育苗,结合入库保存等方式保护岷江柏木种质资源。 相似文献