查询词典 vegetation

So studying the processes and mechanisms of soil hydrology of microbiotic crusts as well as analyzing its influence on soil water conditions in fixed dunes will play an important role theoretically and practically in understanding the evolution of artificial vegetation community in fixed dunes and the security of artificial sand-fixing vegetation system.

因此，通过野外试验揭示微生物结皮对土壤水文过程的影响和机理，评估其对雨养植被固沙区土壤水环境的影响，对于认识固沙区人工植被群落的演替和人工植被固沙体系的安全性都有着重要的理论意义和实践意义。

Using the survey data of several indexes as well as field experimental data of soil hydrology of microbiotic crusts in artificial vegetation-fixed sand dunes in Shapotou area, the impacts of microbiotic crusts on soil hydrological processes which included the penetration, interception and evaporation processes of precipitation were examined, and their mechanisms were also studied. The security problem of vegetation-fixing system due to the changed soil water environment in fixed sand dune area was analyzed further.

本文在上面的立意下，我们对沙坡头人工植被固沙区对微生物结皮的若干指标进行了详细的调查和试验，并安排了一系列微生物结皮土壤水文过程试验，从不同的角度揭示了微生物结皮在降雨渗透、拦截和蒸发过程中的作用，及其对降水在沙丘土壤剖面中的水分分配过程和格局的影响，并进一步分析了微生物结皮对固沙区土壤水环境的影响和植被固沙体系的安全问题。

The south sites locate on subtropical monsoonal climate region, which vegetation types mostly are evergreen vegetations and the start and end of growing season are not obvious. Therefore, BGP and EGP estimated by the model are not the real start and end of growing season, but reflect vegetation's response to regional climate changes.

这是因为南方站点地处亚热带季风气候区，地表以常绿植被为主，植被生长季开始与结束日期均不明显，因此遥感监测的并非真正意义上的植被生长期始末日期，而是植被对区域气候因子变化的响应状况。

For biogenic VOC modeling, emission factors, vegetation biomass and leaf area index were determined for 37 vegetation types. The widely accepted algorithm of Guenther et al.(1993), describing the relationship between light, temperature and the VOC emissions, was adopted. A new canopy model was established to simulate photosynthetically active radiation and leaf temperature within the canopy.

对于VOC生态源模式，确定了37种植被的VOC排放因子、生物量和叶面积指数；采用了相对成熟的关于VOC排放强度和光合有效辐射、叶面温度的依赖关系；建立了一个新的植被冠层模式以模拟冠层内PAR和叶面温度的变化。

The Journal of Vegetation Science publishes papers on all aspects of vegetation science, with particular emphasis on with that papers including theory, methodology, spatial patterns (including plant geography and landscape ecology), temporal changes (including palaeoecology and demography), processes, and description of ecological communities (by phytosociological or other methods), provided the focus is on increasing our understanding of plant communities.

植被科学杂志》发表有关植被科学方面的论文，着重于理论、方法论、植物地理学和景观生态学研究的空间模式，古生态学和人口统计学中的时空变化，生态生理学中的过程和植物社会学中的生态群落描述等方面内容，目的在于提高人们对植物群落知识的认识和了解。

The aim of this research is to understand the ecological relationship between sand vegetation and environment, adaption charactristics of psammophilous plants to sandy environment and feature of plant resources in Otindag Sand Land, and further to provide theory evidence for selection optimal sand-fixation species and planning feasible process of vegetation restoration in desertification control.

本论文的目的是了解沙地植被与环境的生态关系、沙生植物适应沙地环境的特点以及沙地植物资源特征，为在沙漠化防治中选择合适的治沙物种、制定合理的植被恢复方案提供理论依据。

Sabaigrass planting improves the soil water conservation functions. The study results indicated: vegetation influenced the soil water conservationfunctions of the purple sloping fields greatly. Pure and mixed stands of Sabaigrassvegetation not only improved the soil water conservation functions in purple soilsloping fields, but also has the better effect than wild vegetation.

2龙须草种植可明显改良土壤蓄水性能本研究结果表明：植被的存在与否对紫色土荒山坡地土壤蓄水性能影响很大，龙须草纯种植被和龙须草-林木复合种植植被不仅极显著地改良了紫色土荒山坡地土壤蓄水性能，而且其改良效果显著好于野生自然植被。

SPSS cluster analysis and CANOCO ordination method were applied to discuss the relationship between vegetation and its environmental factors in the west slope of Helan Mountain. The results show that the vegetation community can be divided into three types, namely Salsola passerina-Reaumuria soongorica community, Stipa breviflora-Stipa grandis community and Prunus mongolica-Ulmus glaucescens community.

通过SPSS聚类分析和CANOCO排序研究了贺兰山西坡植被分布与环境因子的关系，结果表明：在海拔梯度上，贺兰山西坡植被大致可以划分珍珠猪毛菜－红砂群落、短花针茅－大针茅群落和蒙古扁桃－灰榆群落3种类型。

From nature factor, there is arid and strong wind and plenty of sand material that derives from alleviation of rivers in Shiquanhe basin. The vegetation ecology system is very vulnerable. From human being action, the actions of secular excessive firewood and herd and disorder exploitation sandrock make origin vegetation completely destroy and alleviation including plenty of sand material whose structure is loose expose under the effect of wind force.

从自然因素看，狮泉河盆地气候干旱多风，河流冲积形成的沙源物质丰富，植物生态系统脆弱；从人类活动来看，多年的滥樵、过牧、乱采砂石等行为，将原植被破坏殆尽，使结构松散的含有丰富沙物质的狮泉河冲积物直接暴露于风力作用之下。

This paper presents the high-resolution sequence of vegetation change of the last inter-glacial period in Xishan Mountain,Beijing by pollen analysis and thermoluminescent dating technology with reconstruction of the palaeo-vegetation and palaeo-environment of this region.

末次冰期—间冰期气候旋回研究是过去的全球变化研究的三大重点之一，通过孢粉分析和热释光断代建立了北京西山末次间冰期植被的演化序列，研究了该地区古植被与古环境的演化规律。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。