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文章从上海市绿化土壤的形成过程,阐述了上海市绿化土壤的特点,指出:上海市绿地土壤肥力较低,是制约其绿化发展的重要因素之一,论文阐明了在上海市绿地建设和养护管理中,按系统工程学原理,实施科学的、可操作的土壤改良和管理对策。
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采集福贡县县城林业土壤,分析了其物理性质和速效养分含量。结果表明,福贡县县城林业土壤密度平均值为1.54g·cm-3,孔隙度平均值为40.12%,速效磷含量平均值为18.63 mg·kg-1,速效钾含量平均值为156.51 mg·kg-1,碱解氮含量平均值为25.73 mg·kg-1。数据表明,福贡县县城林业土壤密度和孔隙度偏低,速效钾和速效磷含量丰富,碱解氮缺乏。
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上海林地和绿地的土壤碳含量较低,固碳能力约为7.5万t/年。通过植树造林增加碳汇的潜力有限。建议通过加强森林抚育提高森林碳储量和碳密度;探索多元化的城市林业建设方式;因地制宜发展立体绿化,提高城市绿量;实施节约型园林绿化管理模式等措施来提高碳存储能力。
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在山西省3条高速路典型绿化路段路侧设置样带,按距离梯度采集路旁土壤及植物叶片进行Pb、Cr、Cu、Zn重金属含量测定,分析4种重金属污染物在表层土壤及叶片中的扩散格局和相关性。结果表明,山西省主要高速路绿化带路旁土壤中Pb、Cr、Cu和Zn4种重金属污染物相对集中在10~40m范围内,路旁绿化植物叶片中也主要集中在40m范围内,不同重金属元素峰值位置不同;路旁土壤中4种重金属元素之间有良好的同源关系,土壤Cu、Zn与植物叶片中同种元素含量呈正相关关系,土壤Cr、Cu、Zn与植物叶片中4种重金属元素与采样距离均呈负相关关系;杨树对4种重金属元素的富集能力不同,由高到低表现为Zn、Cu、Pb、Cr。
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使用椰壳植物纤维改良受建筑废弃物混凝土、水泥、石灰渣石污染的城市绿化土壤 ,试验表明 :用椰壳植物纤维和土壤重量比在 1∶10～ 15 ,可以显著改善被污染土壤理化性能 ,减少容重 ,缓解土壤板结状况 ,提高土壤保水能力和水的利用率 ,节约浇灌用水 ;增加土壤微生物种类和数量 ,使土壤较适合城市绿化植物的生长。 相似文献
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Over a period of 16 years, unburned longleaf pine (Pinus palustris Mill.) pole stands grew an average of 27% more volume than similar stands regularly burned. Treatments included biennial burns in winter, spring, and summer plus an unburned check, each of which was combined with three supplemental treatments, namely, initial herbicide injection of all hardwoods, repeated handclearing of all woody stems, and no treatment. All unburned and winter-burned plots were paired to study this growth reduction relative to treatments. The status of nitrogen, phosphorus, available moisture holding capacity, bulk density, and macropore space was determined in both surface and subsurface soils. Foliage from pines on sampled plots was analyzed for N, P, K, Ca, Mg, Mn, Cu, Fe, and Zn. Burning did not significantly affect either soil N and P or foliar nutrients. However, burning reduced available moisture holding capacity and macropore space and increased the bulk density of surface soils, and also reduced the moisture-holding capacity of subsurface soils. The results from this and other studies suggest that growth losses are due, at least in part, to increased moisture stress associated with changes in soil physical properties. 相似文献
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Steven H. Sharrow 《Agroforestry Systems》2007,71(3):215-223
Livestock, pasture, and timber trees are intimately interrelated in silvopastures. Most silvopasture research to date has
focused on forage/animal/tree interactions, with less attention paid to animal/soil interactions in silvopastures. While a
considerable body of work has been devoted to understanding the effects of livestock trampling on plants and soils in pastures,
less has been done for livestock grazing in forests, and even less is available for silvopastures. Three replications of Douglas-fir
forest, Douglas-fir/subclover pasture/sheep silvopasture, and subclover/sheep pasture were established in 1989 near Corvallis,
Oregon USA. Pastures and silvopastures were grazed each spring during 1990–2001. These plots were sampled in 2002, after 11 years
of grazing, and again in 2004 following 2 years without grazing. Soil in the silvopastures had 13% higher bulk density and
7% lower total porosity than those in adjacent forests in 2002. Most of the difference in total porosity was air-filled pores.
Average water infiltration rate was 38% less in silvopastures than in forests, however total water stored in the top 6 cm
of soil at field capacity was similar. Soil bulk density, total porosity, and air-filled pore space was similar for forests,
pastures, and silvopastures after 2 years without livestock grazing. The infiltration rate of silvopasture soils in 2004 had
increased to be similar to those of forests in 2002, however, forest soil infiltration rates also increased and continued
to be higher than those of silvopastures. Plant production was not sensitive to changes in any of the soil parameters measured.
Although livestock grazing did change soil infiltration rates, soil bulk density, and soil porosity, the effects were quickly
reversed following cessation of grazing and had little detrimental effect on silvopasture forage or tree production. 相似文献
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为探讨合果木在不同土壤情况下的生长表现,选取中山市五桂山、三乡、长江水库及中山树木园4个造林地点对合果木的生长情况进行调查,同时选取土壤质地、土壤容重、pH值、有机质、全氮、全磷、全钾、碱解氮、有效磷和速效钾10个土壤指标作为评价系数,运用修正的内梅罗(Nemoro)综合指数评价法对土壤肥力进行综合评价。结果表明,4个合果木造林地点土壤综合肥力系数p为0.40~0.66,均属于贫瘠土壤;4个造林地点综合肥力系数排序为树木园 > 五桂山 > 三乡 > 长江水库,这与合果木树高和胸径的年生长情况相一致;在土壤贫瘠的情况下,合果木仍能保持较快的生长速度;树高年生长量与土壤综合肥力系数相关性最高,相关系数为0.704,其次为枝下高和胸径年生长量。 相似文献
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不同施肥对雷州半岛桉树林地土壤培肥效应研究 总被引：1，自引：0，他引：1
本文研究了雷州半岛两种主要类型砖红壤有机肥与无机肥配施对桉树土壤养分特征和土壤培肥效应。结果表明:在雷州半岛低地力的土壤中种植桉树时,浅海沉积物发育的砖红壤有机质有所提高,而玄武岩砖红壤有机质下降;土壤有机质含量与林木生长量相关性为极显著水平,与施肥量的相关性较低,未达到显著水平。随施有机肥数量的增加,有机质呈上升趋势。施用滤泥1.5～2.5 kg.株-1时,土壤有机质比单施无机肥提高0.02%～0.21%,比不施肥提高0.07%～0.26%。经施肥后5a测定,施有机肥处理容重比施无机肥的降低0.01%～0.22%,总孔隙度比施无机肥的提高0.1%～7.1%,说明施用有机肥改良砖红壤物理特性。因此,两种类型砖红壤中有机肥施用对桉树土壤肥力具有极显著培肥效应。 相似文献
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为探索科学施肥模式,缓解园林绿地土壤肥力的退化,以油松为处理对象,研究了园林废弃物、化肥和腐熟鸡粪对园林绿地土壤理化性质的影响,结果表明:施肥能够显著降低土壤容重和pH,增加土壤毛管孔隙度、非毛管孔隙度和总孔隙度,提高土壤有机质含量,土壤电导率(EC值)变化不显著.以穴施腐熟鸡粪效果最佳,在0～30cm土层中,穴施鸡粪... 相似文献
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对淮海经济区主要城市绿地土壤的理化性质进行了研究。结果表明:该地区绿地土壤以壤质砂土、砂质壤土、壤质粘土为主,土壤硬度为10.61~21.34 kg/cm2,基本能满足植物生长发育的需要;有机质含量为0.83%~1.48%,全氮含量0.051%~0.094%,全磷含量0.038%~0.069%,全钾含量1.685%~2.038%均低于当地农业土壤,土壤pH值7.60~8.63偏碱性。其有效养分含量不均,土壤养分间相关性差。 相似文献