grassland cover 中文意思是什麼
grassland cover
解釋
草地植被-
The great bustard is polyphagia bird, but it feeds mainly on plants. the feeding field habitat selection relate with that whether the grassland burn or not last year. the important factors that determine the feeding field selection are the plant species, vegetative cover score. density hemerrocallis minor and the density of pedacularis sp. on burning grasslandsjthe density of vegetation. insects quanlity. plant species richness and the height of plant are the main factors that determine the feeding field selection on unburning grasslands
大鴇是雜食性鳥類，但以植物性食物為主。對于取食地的選擇往往跟草原上一年是否被火燒過有關。在火燒地，植物種類數、植被蓋度、小黃花菜密度和蒿密度是取食地選擇的重要因素；在非火燒地，植被密度、昆蟲數量、植物物種豐富度及植物高度在大鴇取食地選擇中發揮重要作用。 -
The great bustard selects the areas with abundant plant species. higher vegetative cover score. smaller proportion of bare area and taller plants to display on postfire grasslands ; the important factors that influence the great bustard to selection display fields are the proportion of hay, stipa baicalensis density and the thickness of hay on unburing grassland
在火燒地，大鴇會選擇植物種類數較多、蓋度較大、裸地比例較小及植株相對較高處進行求偶炫耀；在非火燒地，枯草比例、貝加爾針茅密度及枯草厚度是影響其求偶場選擇的重要因素。 -
The middle and lower parts of woodland and grassland had higher soil water contents during rainy season, which resulted from smaller evapotranspiration and more infiltrated water with a lower gradient. however, upslope runoff infiltration was another reason for hillslope with a lower cover ratio, such as bare land
雨季林草地坡中下部土壤水分含量較高的原因，可能主要與其蒸散較小且坡度較緩導致入滲水量較多有關；但是對于植被覆蓋度較低的坡地（如裸地） ，坡中下部土壤水分含量較高還與上方來水有較大的關系。 -
The species and genera of the vegetation cover mainly consisted of warm - dry plants whose main type is the alternation of the forest grassland or grassland
植物種屬以溫帶乾旱植物為主，植被類型多為森林草原及草原交替出現為主。 -
Aiming at the ecological environmental deterioration of bashang, from 2002years to3 ~ 5months of 2003 years. sand - transporting quantity of land cover types were on - the - spot moinitoring in gale seaon, comparing the productivity of the main crops. improving environment and developing economy are compositively considered for applying returning cultivated to woodland and grassland to supply the base of theory and technology. the main results as following : 1 observing the sand transporting quantity of artificial grassland, stubble land and cultivate land. indicates that when wind speed is higher ( 8. 0m / s ), the sand transporting quantity of artificial grassland of 200cm reduces 35. 5 % in average more than that of cultivate land, 34. 5 % sand - transporting quantity than that of stubble land. no distinct difference between stubble land and cultivate land. and when wind speed is lower ( = 5. 0m / s ), the sand - transporting quantity of coverage is no distinct difference according to the analysis of variance
從改善環境和發展經濟兩方面綜合考慮，為實施壩上地區「一退雙還」提供了理論與技術依據。主要研究結果如下： 1對人工草地、作物留茬地及耕翻地的輸沙量觀測表明：勁風（ 8 . 0m s ）下，人工草地比對照耕翻地輸沙量在200cm高度內平均降低了35 . 5 ，比作物留茬地平均降低了34 . 5 ；作物留茬地輸沙量與耕翻地差異不顯著；微風（ 5 . 0m s ）下，不同地表覆被類型對輸沙量的影響差異不顯著。 -
The degraded ecosystems include : > 25 dry land, mountain dry land, low density forest, grassland of low cover rate or moderate cover rate, all of which are the sources of soil and water loss. the low intensity of soil and water loss accounts for 55 % of the project area, the moderate for 23 %, and fierce for 12 %
早地、山區早地、疏林地以及低、中覆蓋度草地，也是水土流失主要的策源地;其水土流失的強度也表現出微度侵蝕占項目區的55 % ，中度侵蝕佔23 % ，強度侵蝕佔12 % 。 -
The main characteristics of land use / land cover change in xilin river basin over the past two decades were significant decrease in area of meadow grassland, temperate grassland vs. significant increase in area of cropland, desert grassland, urban area and desertilized land
錫林河流域20年來土地利用/土地覆蓋變化的主要特徵為草甸草原、典型草原面積的大幅減少和荒漠草原、農田和沙漠化土地面積的大幅增加及城鎮的擴張。 -
The first day cover features an illustration comprising both a mature and a young mushroom, set against a refreshing pastel background with soft green watercolour splashes representing blades of grass. the mushroom is orange waxcap, also known as witch s hat, and is commonly found in unfertilised grassland
首日封以清新的粉彩色系和淡綠水彩繪畫的草葉作背景，烘托出一大一小兩只常見于未經施肥草地上的橙色蠟傘（戲稱巫師之帽） 。 -
The others showed partly decreased, but the degradation of vegetation were obviously in lower reaches of tarim and cherchen river ; in the mountain area of southern xingjian, the forest area were increased, and the others decreased ; in northern xingjian, both the mountain and the plain area increased. they showed the decrease of desert and the increase of oasis ; the change of vegetation cover in the hexi corridor - alax desert were not obviously ; but in chai - damu basin, the area of desert and low cover grassland increased, the others vegetation decreased, especially in the high cover grassland. that showed the great degradation of ecosystem, and the most of degradation was shown in the north hillside of the arjin mountain and qi - lian mountain
而從各個分區來看，情況不盡相同:南疆地區平原區綠洲面積擴大，荒漠面積基本不變，其他類植被面積不同程度縮小，而在塔里木河下游、車爾臣河下游植被退化;南疆山地森林面積略有增加，其他類植被面積略有縮小;北疆的平原區和山區的植被狀況均有改善，表現為荒漠面積縮小，綠洲面積增加;河西走廊一阿拉善地區總體變化不大;但是柴達木盆地的荒漠面積、低覆蓋度草地增加，其他類植被，尤其是甚高覆蓋度植被（草甸）的面積縮小，表明該地區的生態環境退化，而退化表現的主要地區在環柴達木盆地的阿爾金山和祁連山的北坡。 -
( 2 ) runoff - yielding time on grassland with a higher cover ratio primarily depended on initial water content, and their relationship might be described by a power function too. surface crust could easily take place on bare land, so its runoff - yielding time primarily depended on rainfall intensity, and their relationship might be described by a linear function
（ 2 ）植被覆蓋度較高的荒草地，產流時間主要取決于初始含水量，兩者的關系可用冪函數描述；裸地因降雨產生地表結皮，產流時間主要取決于降雨強度，兩者的關系可用線性描述。 -
It is discovered that the correlation between msavi ( modified soil adjusted vegetation index ) and vegetation coverage is higher than that between ndvi ( normalized differential vegetation index ) and grassland coverage when the land cover is low. so msavi can be used as the main index of grassland desertification degree. in order to evaluate the precision of the result, different methods such as supervised classification, unsupervised classification and visual interpretation on image are tried respectively
本文將其作為草地沙化的分級指標，直接通過計算分級，建立msavi等級與草地沙化程度的對應關系，確定草地沙化的程度，然後將msavl分類結果分別與目視解譯、監督、非監督分類的結果進行了精度比較，其精度高於監督與非監督分類，與典型區現場繪制和目視解譯結果的誤差為5 . 9 ，能滿足草地沙化監測實際應用要求。 -
The degradation evolution route of the grassland ecosystem in xilin river basin was analyzed utilizing gis techniques from the view of the point of land use / land cover classification of multi - temporal landsat tm / etm + images
從遙感影像的分類結果入手，用gis方法分析了錫林河流域草地系統的退化演化路徑。 -
Envi, a software that can deal with remote sensing image, was used to process tm image. according to the investigation on the spot, the grassland taxonomy of our country and the criterion of estimating environment quality, the vegetative cover in the source area of the yellow river was classified as five kind in this thesis
本文利用envi遙感圖像處理軟體加工處理的tm衛星影像，根據實地調查，按全國草地調查統一分類法，結合生態環境質量評價標準，本文將黃河源區植被覆蓋劃分為5個等級，並採用非監督分類法對黃河源區tm影像進行分類。
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