查询词典 protection forest

The 30th article of the berm bank protection forest, river management in the organization to create and manage any other unit or individual is allowed to occupy, destroy or cut down.

第三十条护堤护岸林木，由河道管理单位组织营造和管理，其他任何单位和个人不得侵占、砍伐或者破坏。

All measured heavy metal concentrations in roadside soils of Beiyan road,which had sparse protection forest,decreased exponentially with the increase of distance from the road; the maximum heavy metal value appeared within the distance of 15 m from Beiyan road.

公路防护林体系较差的北沿公路路侧土壤纵向剖面重金属含量随距路肩距离增加呈指数下降，土壤重金属重污染区在距路肩15 m范围内。

Observation about status of wind gap on coastal shore and comprehensive analysis on technology on location showed that the key technology of establishing protection forest in wind gap on coastal shore is adopting mature seedling of Casuarina equisetifolia with stronger resistance and grow faster.

通过对海岸风口沙地现状的观测和对该地段造林技术的综合分析表明：风口沙地营建防护林的关键是采用具有抗性强且又速生的木麻黄大苗，深穴整地，适时造林，放客土、施磷肥和建立有效的挡风屏障等综合配套技术，造林成活率可达到98。

All these studies put scientific basic for rational management for sustainable coastal protection forest of Casuarina equisetifolia, and meet the demand of the construction of coastal prevent system project.

虽然国外大量的研究表明，细根在森林生态系统的物质循环和能量流动中发挥着巨大的作用，但我国对林木细根的研究还是停留在国外20世纪70年代末、80年代初的水平上，对细根在森林生态系统中的主要作用认识不足。

And in the end, the paper gives a case study on the protection maturity of coastal Casuarina equisetifolia protection forest in Dongshan county, Fujian province, and analyses its regeneration cutting age.

最后，应用上述理论分析，对于福建省东山县沿海木麻黄防护林的防护成熟进行了实证分析，并分析了其更新采伐年龄的决策。

This exerts negative influences for the sustainable development of coastal protection forest system. Many researchers focus their studies on the rational structure and function of sustainable coastal protection forest of Casuarina equisetifolia, try to reveal the contributing factors to cause low-value and low-effective forest and probe into its mechanisms.

鉴于此，木麻黄防护林可持续经营问题引起了国内外许多学者的普遍关注，开展防护林生态系统结构和功能的研究，阐明木麻黄低质、低效林的成因及其发生、发展的生理生态机制，从而为木麻黄防护林的合理经营提供科学依据，是沿海防护林工程建设的迫切任务。

Nitrogen and phosphorus concentrations, N:P ratio, nutrient retranslocation efficiency of mature and senescent leaves in pure and mixed protection forest of Betula luminifera and Cunninghamia lanceolata were discussed in this paper.

以福建省三明市郊国有林场的光皮桦、杉木为研究对象，探讨了纯林和混交林成熟叶与衰老叶中的养分状况、氮磷比、养分内转移率以及它们之间的关系。

In chapter 4, the restoration and rehabilitation technology of multiple functional forest system were studied. Firstly, it was expounded that we should restore and rehabilitate watershed protection forest in source of rivers, in catchment areas of small watersheds and around reservoirs, which includes protecting the present natural forests and planting watershed protection forests in the non-forest land. The main afforestation models comprises "Cupressus funebris + Alnus cremastogyne or Robinia pseudoacacia}","Pinus massoniana + Camellia oleifera (or Robinia pseudoacacia","Populus + Robinia pseudoacacia ", etc.

首先阐述了应在河流源头、小流域集水区和水库周围恢复和重建水源涵养林，这包括保护好现有天然林和在无林地营造水源涵养林，主要林种组合模式有&柏木＋梢木（或刺槐丫'／'马尾松＋油茶&、&杨树＋刺槐&等；其次着重论述了坡地水土保持林体系的重建技术，这包括工业原附、经济林、薪炭林、混农林业和退耕还草还牧等的经营和 A 建设技术；接着简要介绍了林牧业产业化途径。

Salix matsudana, Ulmus pumila, Quermus mongolica, Populus alba×P.beroliensis and Betula platyphlla are frontal 5 tree species with weight value 90.37, 90.12, 88.12, 87.55 and 86.2 respectively, were used for farmland protection forest; Acer negundo, Salix matsudana, Juniperus rigida, Fraxinus mandshurica and Ulmus pumila are frontal 5 tree species with weight value 78.14, 76.92, 75.96, 74.72 and 74.56 respectively, were used for urban protection forest; Ulmus pumila, Salix matsudana, Populus alba×P.beroliensis, Acer negundo and Larix gemelinii are frontal 5 arbor tree species with weight value 80.07, 79.07, 77.5, 72.42 and 71.67 respectively, were used for road protection forest; Salix matsudana, Populus alba×P.beroliensis, Ulmus pumila, Larixgemelinii and Betula platyphlla are frontal 5 tree species with weight value 92.37, 88.72, 86.62, 85.82 and 85.7 respectively, were used for river protection forest; Fraxinus mandshurica, Larix gemelinii, Populus alba*P.beroliensis, Ulmus pumila and Salix matsudana are frontal 5 tree species with weight value 89.61, 8.35, 87.12, 85.56 and 80.15 respectively, were used for wood forest; Cornus alba, Prunus tomentosa, Primus triloba, Syringa obalata and Sambucus williamsii are frontal 5 shrubs with weight value 82.93, 81.23, 80.85, 78.38 and 77.78 respectively, were used for landscape forest; and Acer negundo,Malus baccata, Sorbus pohuashanensis, Prunus maackii and Prunus padus are frontal 5 arbors with weight value 82, 81.52, 80.3, 79.62 and 78.9 respectively, were used for landscape forest; Prunus salicina, Prunu

根据哈尔滨地区不同林种的功能要求，给出了不同指标的期望值，通过查询系统可以得到旱柳、榆树、蒙古栎、银中杨、白桦为符合农田防护林的前五位的树种，权重值分别为90.37、90.12、88.12、87.55、86.2；糖槭、旱柳、杜松、水曲柳、榆树为符合城市防护林的前五位的树种，权重值分别为78.14、76.92、75.96、74.72、74.56；榆树、早柳、银中杨、糖槭、兴安落叶松为符合道路防护林的前五位的乔木树种，权重值分别为80.07、79.07、77.5、72.42、71.67；旱柳、银中杨、榆树、兴安落叶松、白桦为符合河岸防护林的前五位的树种，权重值分别为92.37、88.72、86.62、85.82、85.7：水曲柳、兴安落叶松、银中杨、榆树、旱柳为符合用材林的前五位的树种，权重值分别为89.61、88.35、87.12、85.56、80.15；红瑞木、毛樱桃、榆叶梅、紫丁香、接骨木为符合风景林前五位的灌木树种，权重值分别为82.93、81.23、80.85、78.38、77.78，糖槭、山丁子、花楸、山桃稠李、稠李为符合风景林前五位的乔木树种，权重值分别为82、81.52、80.3、79.62、78.9；李、杏、文冠果、山楂、野梨为符合经济林的前五位的树种，权重值分别为88.85、80.88、73.25、69.35、63.77。

Water protection forest construction is the important base of forest environment protection and sustainable development.

水源保护林建设是保护森林环境，实现林业持续发展的重要基础。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。