桉树对土壤肥力阻碍
桉树对土壤肥力的阻碍
1 桉树的相关概述
1 related overview of the eucalyptus
桉树简介
eucalyptus introduction
桉树是桃金娘科桉树属的总称,属常绿乔木。树皮粗厚而宿存或滑腻而年年脱落,有挥发性芳香油,同松树、杨树一路成为全世界最速生、经济价值最大、生态和社会效益最高的三大树种。一百连年前我国开始引种桉树,初期只是小规模的引种实验或观赏性质的树种;最近几年来桉树人工林的规模迅速进展,国内总的种植面积已达154万公顷,仅次于印度和巴西,要紧散布在两广地域、云贵川地域、福建和海南等长江以南地域。
The floorboard of the eucalyptus is myrtaceae eucalyptus, evergreen trees. Bark thick and persistent or smooth and loss year after year, have a volatile balmy oil, become the world's
fast-growing with pine, poplar, the economic value of the three largest and most ecological and social benefits. Early one hundred years ago began to introduction of eucalyptus in China, only small-scale introduction experiment or ornamental quality tree species; The size of the rapid development of eucalyptus plantation in recent years, domestic total planting area of  million hectares, is second only to India and Brazil, are mainly distributed in areas, YunGuiChuan areas of guangdong, fujian and hainan region south of the Yangtze river.
桉树用途
eucalyptus purposes
桉树的经济效益比较客观,要紧用在以下方面:第一个重要的用途确实是纤维材,桉树造纸普遍的应用在我国江淮一带的纸浆厂,桉树纤维材还能够用于生产纤维板和刨花板,最近几年来华南的纤维板厂正慢慢成立和完善并正向环保型纤维板生产方向进展;第二桉树是质量上成外部美观的家具装饰用材,多用于高级次的建筑物和室内装饰,不但质量好,而且十分美观;第三桉油是用途良好的医药和香料原料,其中史密斯桉、直杆蓝桉、亮果桉等是产油较高的树
种。最后桉树在园林绿化和生态林建设方面的应用十分普遍。
作比较的句子10个
The economic benefits of eucalyptus is more objective, mainly used in the following aspects: the first is important use fiber material, eucalyptus is widely used in paper pulp mill of jianghuai area in our country, eucalyptus fibre material can also be used for production of fiberboard and particleboard, fiberboard factory in south China in recent years is gradually establish and perfect and is environmentally friendly fiberboard production direction; Second on the quality of eucalyptus is into external beautiful furniture, decoration material used in high-grade building and interior decoration, not only of good quality, and very beautiful; Third eucalyptus oil is use good raw material medicine and spices, including eucalyptus, straight rod Smith is eucalyptus globulus, bright fruit such as eucalyptus oil high tree species. Finally eucalyptus in landscaping and the application of the construction of ecological forest is very extensive.
桉树的阻碍
财务分析指标 the influence of eucalyptus
桉树人工林大面积进展可能会致使土地肥力衰退,这种衰退要紧表此刻两方面:一方面桉树因其速生性,其生长进程需要由土地供给大量的养分,因此对土壤肥力的消耗较大;另一方面,桉树林地的治理方式不科学,如不论土壤条件,改变了土壤结构,减少了地表的植被覆盖,进而致使林地土壤水分下渗量减少和水土流失的严峻问题。
Could lead to widespread development of eucalyptus plantation land fertility decline, the decline is mainly manifested in two aspects: on the one hand, eucalyptus because its speed is, the growth process of land supply has to be a lot of nutrients, thus for the consumption of soil fertility; Eucalyptus forest, on the other hand, the management is not science, such as whether soil conditions, change the soil structure, reduced the surface vegetation cover, leading to reduced the volume of forest land soil water infiltration and the serious problem of soil erosion.
2 土壤肥力
2 the soil fertility
土壤肥力的界定
definition of soil fertility
英文qq情侣网名>游戏情侣名
土壤是林业生产的首要因素,常以N、P、K和有机质等养分的含量来衡量土壤肥力的高低。土壤肥力是土地生产力的基础,土壤肥力是土壤为植物生长提供营养和环境条件的能力,是土壤大体性质的综合表现。苏联土壤学家威廉士对土壤肥力的概念是:“土壤在植物生活的全进程中同时又不断地供给植物以最大量的有效养分及水分的能力”;现代学者孙波、陈金林等人将土壤肥力概念为:“内外在因素(光照、温度与土壤物理条件等)都适合特定植物生长时,土壤以适当的量和平稳的比例向这种植物供给养分的能力。”
Soil is the first factor of forestry production, often nutrients such as N, P, K and organic matter content to measure the level of soil fertility. Soil fertility is the basis of land productivity, soil fertility is the ability to provide nutrients for plant growth and environmental conditions, is the integrated embodiment of soil basic properties. Soviet soil scientist William James to the fertility of soil is defined as: "soil in the whole process of plant life and continually supply plants with the most large amounts of available nutrients and moisture capacity"; Sun bo, modern scholars Chen Jinlin et al. Soil fertility is
硬卧上中下
defined as: "absurdism factors (light, temperature and soil physical conditions, etc.) is fit for a particular plant growth, soil in the appropriate amount and balance the proportion of the ability to supply nutrients to the plant."
土壤肥力评判指标
the soil fertility evaluation index
一样来讲土壤肥力与健康的诊断要紧有描述土壤健康的描述性分析和定量研究的分析性指标,具有定量单位的分析性指标是学术研究中评判土壤肥力的要紧标准,分析性指标要紧包括物理指标、化学指标和生物指标,在评判土壤肥力时依照不同的土壤和评判目的,选择性的对指标进行取舍组合。学者研究调查指出合理评判土壤肥力应该参考以上指标进行综合测量。
In general the soil fertility and health diagnosis is mainly describe the soil healthy descriptive analysis and quantitative analysis of the indicators, with the quantitative analytical index of the unit is the main standard of evaluation of soil fertility in the academi
c research, analytical indicators mainly include physical, chemical and biological indicators, according to different soil and when evaluate the soil fertility evaluation purpose, selectively to choose combination index. Scholars research points out that the reasonable evaluation index of soil fertility should refer to the above comprehensive measurement.

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