When coverage varying from high to low, the parameter a decreasing, and b increasing. The fitted regression equation between total vegetation coverage and runoff duration as following, C = 3.4881nt_p -11.772 (R~2=0.9477). The equation shows that the vegetation is positive correlation to duration, i.e.

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Based on the heat balance equation of the vegetation canopy layer and the assumption that its short wavelength absorptance, long wavelength emissivity, heat or moisture transfer coefficient, and bulk stomatal resistance are random, uncorrelated variables with normal distribution densities, the theoretical modeling for IR radiance statistics of vegetation canopy surface is presented by Monte Carlo simulation, with the surface radiative temperature statistical distribution given.

根據植被層能量熱平衡方程，選取植被短波吸收率人人干人人操人人、長波發(fā)射率字幕网国产在线观看、熱與水汽傳輸系數和氣孔阻力為獨立的隨機變量，并假設它們均服從正態(tài)分布日屄网站免费看，利用Monte－Carlo方法性感美女被操免费视频，模擬計算了植被表面紅外輻射的統(tǒng)計特性。

The sixth part: Studies on the dynamic changes of soil retention function value of ecosystem in YUYANG District. Utilized ERDAS8. 5 to interpret the remote sensing image and get LUCC data and vegetation information of YUYANG District. Utilized R2V5. 5 to digitize administrative map, topographic map, vegetation picture, soil distribution map and meteorological website map. Utilized ARCINFOR8. 3 to change every digitization layer to the same projection, to generate Tyson polygon, to structure DEM and do vector polygon overlay. Utilized ARC VIE W3. 3 to obtain the grid data topographic slope and slope length from DEM data of YUYANG District, and then, turned every coverage layer into grid layer and do grid polygon overlay to gain data about dynamic changes of value of soil retention of ecosystem in YUYANG District, at last, the author analyzed the features of the spatial-temporal changes and its reason.The seventh part: Studies on the dynamic changes of fixing drifting sand against wind function value of ecosystem in YUYANG District.

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The pressure on vegetation front surface is larger than that on back surface. And the pressure difference decreases with the lying of vegetation, while viscous force increases.

作用在植被葉片迎水曲面上的壓力都大于背水曲面上的壓力，且其壓力差隨著植被俯臥程度的增大是依次減小在线观看91精品国产不卡，而切應力依次增大黄色视频天免费看一一丝袜。

After elementary surveying on the status quio of wilding vegetation resources in Maowusu Sandy Land, the paper analysis's the succession law of plant community and the evaluates exploitative situation of wilding vegetation resources.

根據對毛烏素沙區(qū)的實地考察，初步調查了該區(qū)的野生植物資源狀況A片强奸少妇毛片按摩，結合野生植物資源類型的調查99伦乱视频，對其沙生植物種群的演替規(guī)律和開發(fā)利用進行了分析和評價。

Xerophytic vegetation; xeromorphic vegetation; xerophious plant; xerad; xerophyte

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In numerical stimulation, flow field, flow velocity distribution and total pressure distribution on vegetation surface were studied around vegetation of three different statuses, i.e. vertical, acclivitous and lying.

通過數值模擬計算，研究了直立在线观看黄片精品、傾斜和臥倒三種不同狀態(tài)下植被周圍的流場特性视频欧美日韩、流速分布特性以及植被表面總壓強分布。

Miscamthus floridulus, Arundo donaxl, Artemisia argyi, Comnyza Canadensis, Crotalaris mucronata, and Kummerowia striata, are pioneer plants for vegetation recovery in coal piles. They have high summed dominance ratio and take crucial action on vegetation recovery and community succession. Many pioneer plants including annual and perennial herbs, e.g. Imperata cylindrical, Comnyza Canadensis, and Crotalaris mucronata colonize successfully to provide conditions for colonization of shrubs, e.g. Buddleja asiatica.

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In this thesis, research on alleviation of autotoxicity by planting mixture of Chinese fir and Broadleaf trees and developing undergrowth vegetation were also done. The results showed that Michelia macclurei and Cinnamomum camphora had positive allelopathic effect on the growth of Chinese fir saplings and developing undergrowth vegetation improved soil decline of Chinese fir plantation.

另外亚洲午夜一区二区三区福利，論文還從植物化感作用的角度，對克服杉木人工林連栽障礙的其它生產措施欧美一区永久视频免费观看，如營造混交林及人促林下植被的發(fā)育生長97成视频在线网，進行了研究：提出了與杉木化學生態(tài)關系良好的兩種伴生樹種，并從化感作用角度證明人促林下植被發(fā)育有利于克服杉木人工林的連栽障礙欧美一级做片性视频。

Research progresses have been performed during the past decade in the following aspects: ecologicaldatabase development, climate and its variability, ecophysiological response of plants to environments,vegetation and landscape changes, biodiversity patterns and their changes, plant functional types and traitswith relation to climatic gradient, productivity and carbon dynamics, pollen-vegetation relationship, tracegas emissions, land use and land cover changes, as well as biogeographical and biogeochemical modelling.

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