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degraded forest ecosystem
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  退化森林生态系统
     (4) measuring the activities of soil enzymes in degraded forest ecosystem;
     (4 )退化森林生态系统的土壤酶活性特征 ;
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     2) the reconstruction integration technology of degraded forest ecosystem;
     ②不同层次退化森林生态系统的重构或重组集成技术;
短句来源
     Suggestions on restoration and reconstruction of degraded forest ecosystem in the upper reaches of the Yangtze River
     长江上游退化森林生态系统恢复与重建刍议
短句来源
     Restoration and Rreconstruction of Degraded Forest Ecosystem in the Upper Reache of the Minjiang River
     岷江上游退化森林生态系统的恢复与重建
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     2)The effects of EM fungi on degraded forest ecosystem and the application in restoration of degraded ecosystem;
     2 )菌根菌在退化森林生态系统恢复与改造中的作用 ;
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  森林生态系统退化的
     The open stands is the manifestation of the degraded forest ecosystem, its soil erosion modulus reaches to 2 647.06 kg/hm 2 ·a, which is 63.94~1 877.35 times of closed stands and mixed forests.
     云南松疏林是森林生态系统退化的表现 ,其水土保持效益最差 ,土壤侵蚀模数达 2 6 4 7.0 6 kg/hm2 .a,是云南松及其混交林地的 6 3 .94~1 877.3 5倍
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  “degraded forest ecosystem”译为未确定词的双语例句
     The main study site is in Wuying forest area of Northeast China. Based on the analysis of structure features and dynamic changes of the Broadleaved Korean pine forests and its secondary forest types, this paper studied the restoration ways for the degraded forest ecosystem and sustainable management.
     该文以黑龙江五营林区为主要对象 ,通过对阔叶红松林及其次生类型结构特征和动态变化的分析 ,研究退化生态系统的恢复途径和可持续经营措施 .
短句来源
     According to the forest vegetation restoring practices in China, it n eeds more concerns to the following problems in the future research: evolutional and historical determinant research of forest vegetation degradation, monitori ng of ecological process of the restored forest ecosystem, biologic al safety, and restoration of the large-scale degraded forest ecosystem.
     从国内大量的生态恢复重建实践来看 ,森林植被的恢复重建研究需要解决以下一些问题 :注重探讨森林植被退化的进化与历史决定因素、注意研究恢复森林生态系统在恢复中的生态学过程、重视森林植被恢复重建中的生物安全问题以及大尺度的森林植被恢复重建问题
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  degraded forest ecosystem
A study was performed selecting one protected forest and an adjacent degraded forest ecosystem to quantify the impact of forest degradation on soil inorganic nitrogen, fine root production, nitrification, N-mineralization and microbial biomass N.
      


The main study site is in Wuying forest area of Northeast China. Based on the analysis of structure features and dynamic changes of the Broadleaved Korean pine forests and its secondary forest types, this paper studied the restoration ways for the degraded forest ecosystem and sustainable management. Broadleaved Korean pine forest is the most typical and stable vegetation type of the region, but its area and stocking have been decreased over the whole distributing regions owing to the long term...

The main study site is in Wuying forest area of Northeast China. Based on the analysis of structure features and dynamic changes of the Broadleaved Korean pine forests and its secondary forest types, this paper studied the restoration ways for the degraded forest ecosystem and sustainable management. Broadleaved Korean pine forest is the most typical and stable vegetation type of the region, but its area and stocking have been decreased over the whole distributing regions owing to the long term over cuttings since recent 50 years. Broadleaved Korean pine forest is the zonal vegetation type. It keeps stable through the generation replacement of the different aged trees and the succession between different species. Conservation should be a better way for the management of this kind of forest. The secondary hardwood forest was formed after the cutting or fire of the virgin Broadleaved Korean pine forest. It is less stable, especially the pure forest type dominated by only one species is degrading seriously under the natural condition. So the restoration should be considered in the management. The secondary popular and birch forest is the pioneer community after the Broadleaved Korean pine forest. But it is simple in composition and unstable in structure. Restoration and rehabilitation should be considered when the forest is managed. In short, the forest structure must be adjusted in order to restore the degraded ecosystem and to manage the forest sustainably.

该文以黑龙江五营林区为主要对象 ,通过对阔叶红松林及其次生类型结构特征和动态变化的分析 ,研究退化生态系统的恢复途径和可持续经营措施 .阔叶红松林是小兴安岭地区最典型和最稳定的植被类型 ,但其面积和蓄积都在迅速减少 ,显著的特性是通过优势树种红松的世代更替及其与阔叶树种的相互更替 ,维持群落的周期性波动和稳定结构 ,经营上应采取保护措施 .硬阔叶林是阔叶红松林破坏后所形成的次生林 ,在一些地区成为杨桦林向阔叶红松林恢复的中间途径 ,具有广泛的代表性 .次生硬阔叶林稳定性小 ,尤其是那些由硬阔叶树形成的纯林更是生长速度慢 ,更新不良 ,结构不合理 ,必须采取有效的恢复途径 ,减缓退化 ,实现可持续经营 .杨桦林是最典型的次生软阔叶林 ,具有十分广泛的分布 .杨树和桦树都是生长速度快的强阳性树种 ,阔叶红松林一经破坏 ,它们首先占据采伐和火烧迹地 ,迅速成林 .然而 ,这些树种材质不良 ,群落结构单一 ,生产力低下 ,极易被其它树种所代替 ,所以要迅速调整杨桦林结构 ,采取恢复和重建措施 ,发展阔叶红松林 .至于非地带性植被云冷杉林和落叶松林等采取维持措施 ,保证生态系统的稳定与平衡

The major characteristics of degraded forest ecosystem in the upper reaches of the Yangtze River. Forest productivity notably descends, and biodiversity obviously reduces, even loses. In the Jia Lingjiang River, Tuojiang River and Fujiang River basin, plants grow slowly, storage capacity is less than to 15m\+3/hm\+2, forest is 30 years old or so,and biodiversity descends, the forest ecosystem type reduces and the quality falls, and some attached species degenerates even disappears.In...

The major characteristics of degraded forest ecosystem in the upper reaches of the Yangtze River. Forest productivity notably descends, and biodiversity obviously reduces, even loses. In the Jia Lingjiang River, Tuojiang River and Fujiang River basin, plants grow slowly, storage capacity is less than to 15m\+3/hm\+2, forest is 30 years old or so,and biodiversity descends, the forest ecosystem type reduces and the quality falls, and some attached species degenerates even disappears.In forestland, the productive potentialities reduce, the renewal of afforestation is very difficult, even bedrock is exposed in some land, and the direction of development is going backward. Soil's chemical property quota is descending with continual cropping in the west of Sichuan, where the second generation of cryptomeria plantation falls by 20%~34\^14%, compared with the first generation. Each component's quality in forest ecosystem is inferior, regulating ability is lack, and forest's function and effect is dropping, structure is becoming disperse and sparse from multiple structure to single structure. Researches show that in degraded shelter-forest ecosystem of Pinus yunnanensis,\% its canopy density is below 0\^4, the number of arbors is 150~700 plants/hm\+2, shrub and herb poorly grows, even disappears. Present situation of degraded forest ecosystem in the upper reaches of the Yangtze River.The areas and the storage capacity of original or natural forest sources reduce by a wide margin. The forest quality descends, and the areas of scattered land, bush forest and shrubbery ground increase. The ecological functions of the remnant original forest such as self-restraint, water and soil conservation and biodiversity protection are in the degrading state.The pure plantation's area increases, but soil fertility degenerates. In the 80's, the number of breeding forest was increasing, but evergreen broadleaf forest was falling and displaced by Cunninghamia lanceolata,Pinus massioniana,Pinus armandi etc. after shelter-forest engineering and high-yield forest construction. These have made natural ecosystem unstable. Fragment of forest ecosystem habitat is accelerated, which causes the inheritable material's obstruction, and species' degeneration. In recent 40 years, more than 5% of the species have disappeared because forest area reduces, and species' existence condition suffers destruction. Soil degradation in old cutovers brings difficulty in afforestation and renewal to some extent. The Suggestions on restoration and reconstruction of degraded forest ecosystem in the upper reaches of the Yangtze River. Technology system on restoration and reconstruction of degraded forest ecosystem in arid and xerothermic river valley districts. Illumination and rainfall is sufficient in the arid and xerothermic river valley districts, but its distribution is extremely uneven, rising and boil-off is as several even over ten times as rainfall; moreover, the unstability of landform and the fragility of ecosystem brings more difficulty in restoring and reconstructing ecosystem. Thus, the most important is to improve the condition of soil moisture content as for the arid district afforestation. First, more attention should be paid to selecting or recommending suitable plants, covering with herbaceous or bush earlier than transportation especially in the odious condition; Second, corresponding measures such as afforesting and bioengineering measures should be adopted to strengthen the ability of preserving soil moisture, and carry on artificial afforestation and renewal. The technology system on reconstruction of fragile ecosystem in subalpine.Subalpine is the main body of self-restraint forest in the upper reaches of the Yangtze River. From the 50's beginning, forest resources falls sharply after trees have been cut down, and the area of plateau lakes and water resources reduce, and the forest thread descends, and vegetation succession shows “non-balance” characteristics, moreover, the seedling period is long, and afforestation survival rate and pres

通过对国内外生态系统恢复与重建研究进展的综述 ,论述了我国长江上游森林生态系统退化的主要特征和森林生态系统退化的现状 ,分析了长江上游生态环境建设存在的主要问题 ,并提出相应对策。在此基础上 ,针对退化森林生态系统提出恢复与重建的基本思路和建议

Based on 3 years locating and semi locating observation, the canopy precipitation interception, soil physical property and water holding capacity of the soil lay, and decreasing effects of runoff and soil erosion are monitored and analyzed at different stands structure. The research results show that the canopy precipitation interception and stemflow of forest were 21.85% and 2.50% respectively. The order of soil physical property and eco hydrological benefit are mixed, shrub and grass stands in turn, and...

Based on 3 years locating and semi locating observation, the canopy precipitation interception, soil physical property and water holding capacity of the soil lay, and decreasing effects of runoff and soil erosion are monitored and analyzed at different stands structure. The research results show that the canopy precipitation interception and stemflow of forest were 21.85% and 2.50% respectively. The order of soil physical property and eco hydrological benefit are mixed, shrub and grass stands in turn, and their modulus are 1.41,36.60,41.40 kg/hm 2 ·a respectively.The open stands is the manifestation of the degraded forest ecosystem, its soil erosion modulus reaches to 2 647.06 kg/hm 2 ·a, which is 63.94~1 877.35 times of closed stands and mixed forests.

根据 3年定位、半定位观测 ,对长江上游云南松林的降水截持效益、林地土壤物理性状及其蓄水效益 ,以及植被削减地表径流与侵蚀的效益进行了研究。结果表明 :云南松林冠层对降水的截留率为 2 1 .85 % ,树干茎流率为2 .5 0 %。不同结构类型云南松林地土壤物理性状、削减坡面径流与泥沙的效益 ,以栓皮栎×云南松混交林为最好 ,灌木云南松林、草被云南松林次之 ,其土壤侵蚀模数分别为 1 .4 1 ,3 6 .6 0 ,4 1 .4 0 kg/hm2 .a。云南松疏林是森林生态系统退化的表现 ,其水土保持效益最差 ,土壤侵蚀模数达 2 6 4 7.0 6 kg/hm2 .a,是云南松及其混交林地的 6 3 .94~1 877.3 5倍

 
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