In plantation ecosystem, the vegetation diversity decreased due to natural factor or human activity, but the level of diversity is not always lower than that of other ecosystems. Especially in region with rare vegetation, the level diversity of undergrowth vegetation in plantation is higher.

人工林林下植被多樣性會因自然或人為因素而下降A片在线播放网站，但是林下植被多樣性并不低于所有自然生態(tài)系統(tǒng)久久综合精品视频7，在植被稀少、種源匱乏地區(qū)国内自拍看视频在线，人工林林下植被的生物多樣性甚至高于自然生態(tài)系統(tǒng)特板人人操556。

Selection and planting of vegetation Taking into consideration characteristics of landform, environment, climate, sunlight, water, temperature, earthiness and vegetation, we have selected suitable plants to maintain vegetation diversity and ecological balance.

植物的選擇和種植考慮地形、環(huán)境www.超碰在线观看、氣候花季传媒视频免费观看ios、光照全部免费的a毛片在线看、水、溫度91POPN九色、土質(zhì)国产黄大片手机在线观看、邊坡特點、植物特性原创av，選擇適宜的優(yōu)良植物組合97人人操人人摸人人搞，以維持植物多樣性和生態(tài)平衡。

The result indicates that, under the same condition of vegetation density and arrangement, when F is smaller than 12.2371, the vegetation behaves absolute erectness and the vegetation roughness coefficient and drag coefficient have no relation with F.

試驗結(jié)果表明国产又大硬又爽免费视频，淹沒植被在植被密度和排列方式相同的情況下久久精品99久久久久久，若植被抗彎指數(shù)F值小于12.2371，植被呈完全剛性中文字幕,大黄片，植被糙率系數(shù)和阻力系數(shù)與F值無關(guān)中日欧美野外日一级黄色A片在线日。

Afterwards, make use of the whole year MODIS-NDVI data of 2004 of Leimeng grassland, Hainan evergreen broad-leaved forests and Qinghai's west hungriness, test the ability of the model of NDVI based on MODIS in monitoring vegetation. The result shows that the MODIS-NDVI can reflect the differences of variety of vegetation and the changes of growth of the same vegetation.

接下來利用2004 年內(nèi)蒙草原，海南省東部常綠闊葉林和青海省西部荒漠一年中的MODIS-NDVI 數(shù)據(jù)福利午夜在线，對MODIS-NDVI 監(jiān)測不同植被和土壤覆蓋類型的特性進行了研究你懂的国产精品永久在线正确入口，結(jié)果說明基于時間序列的MODIS-NDVI 對植被種類的生長變化進行了很好的描述。

According to the investigation on the local situation of aquatic vegetation in Littoral Regions of Gonghu Lake and Meiliang Bay of the Wuxi Taihu Lake, the species of aquatic vegetation, community forms and biomass were acquired. Then a contrast of vegetation distribution characteristic between the two Littoral Regions was analyzed which induced to the analysis of impact factors. In the treatments designed as varying degree oxidation intimidate, the heavy metal cadmium and the ammonia nitrogen single and compound poisons, the COD sewage cultivate, the plant growth opsonin processes, the effect of the intimidate environment on the submerged plant growth and the physiological biochemistry characteristic was analyzed. The effective method to improve the resist adversity of submerged macrophyte was discussed. The results will give a suggestion to the restoration of the submerged macrophyte, the efficiency and reconstruction in Lake Ecosystem.

通過對無錫太湖兩重要湖灣貢湖和梅梁湖湖濱帶沿岸淺水區(qū)水生植被現(xiàn)狀進行調(diào)查中文字幕在线有限公司，了解了水生植物的種類久久支有精品、群落組成及生物量，對兩湖灣湖濱帶沿岸淺水區(qū)水生植被分布特征進行了對比av在线网站亚洲免费，并進行了影響因素分析欧美特级黄A片；通過不同程度的氧化脅迫、重金屬鎘與氨態(tài)氮單一和復(fù)合作用成年黄页网站免费观看视频、高COD生活污水脅迫培養(yǎng)日女av网、植物生長調(diào)節(jié)素處理，分析脅迫環(huán)境和殼聚糖各自對沉水植物生長的影響及作用機理乨伦对白放荡，探討提高沉水植物逆境抗性的有效措施欧美性色欧美A在线视频；探尋沉水植物修復(fù)的理論依據(jù)和有效途徑，為急待進行水生植被恢復(fù)的湖泊提供依據(jù)和建議A片性爱网站。

Finally, PNV had been mapped according to Boolean discrete methods to connect climate submodel and vegetation submodel by GIS. PNV map first represented the spatial distribution of all vegetation types of 4 physiognomic levels in Taiwan, also integrated the diverse comments of altitudinal vegetation zones and geographical climatic regions in the past. Besides, the scattered ranges of 36 dominant trees in the moisture-thermal regime and climatic zone had been drawn via coordinating 585 plot-data with MWI and WDI.

為達繪制潛在植群圖之最終目標(biāo)小黄片高清无码无遮挡，本研究以MWI及WDI之網(wǎng)格圖層代表氣候亞模型，以潛在植群形相分類方案之各階類型代表植群亞模型A级毛片免费全部播放无码软件，藉由布林分離法聯(lián)系此2亞模型之關(guān)系黄色网站AV在线播放，建構(gòu)氣候–植群分類模型，并以地理資訊系統(tǒng)繪制出包含群系綱欧美人性交大先视频、群系亞綱色色色.@com、群系組、群系之潛在植群圖欧美日韩国产一区不卡，首次完整呈現(xiàn)臺灣各階植群類型之空間分布干干激情网，合理說明了山地植群帶分化人人摸人人爽人人、北部植群下降及西南部冬季乾旱等現(xiàn)象，亦整合過去各種有關(guān)垂直性山地植群帶狀分化與水平性地理氣候區(qū)劃分的復(fù)雜意見厕所激情xxb一区二区；另外欧美第1页，本研究將585個樣區(qū)林木座標(biāo)標(biāo)定於MWI及WDI，繪制36種林木於水熱境制及熱量氣候帶之分布范圍高清无码喷水黄片。

During the Last Interglaciation it was the forest, mainly composed of broadleaves, or forest-grassland at the east and middle part of the Chinese Loess Plateau, and was the forest-grassland at the west part of the Chinese Loess Plateau. It changed to the forest or forest-grassland at the most part of the Chinese Loess Plateau in the Holocene, some kinds of hardwood broadleaves dispersing at the warm temperate and the tropic zones appeared. Now the vegetation at the Chinese Loess Plateau inherits from that during the Holocene, the vegetation have been heavily destroyed owing to the human being actions. The vegetation protection at the Chinese Loess Plateau is a significant problem.

末次間冰期期間氣候溫暖濕潤欧美日韩一区综合，黃土高原的中、東部地區(qū)主要發(fā)育了以落葉闊葉林為主的森林或森林草原植被日韩一区二区A片免费，黃土高原西部地區(qū)主要發(fā)育的是以針葉林為主森林草原植被一级婬片A片AAA毛片；全新世期間黃土高原的植被狀況發(fā)生較大變化，黃土高原的大部分地區(qū)為森林植被或森林草原植被人人于人人人操，植被中還有暖溫帶落葉闊葉林欧美在线这里只有精品，并含有少量亞熱帶種屬；現(xiàn)代黃土高原的植被主要還是繼承了全新世以來的植被狀況美日一级片，但是由于人類活動的加劇日韩AV在线直播，對黃土高原的植被產(chǎn)生了毀滅性的破壞欧美一级多人婬片人妻欧美大片，因此亚洲精品国产欧美一二，如何保護黃土高原的自然植被是我們面臨的一個嚴峻的現(xiàn)實問題。

The main conclusions indicated that NDVI values seemed to be turning up in the area during recent 22 years (1982—2003). That suggested the vegetation cover was improved in Guizhou. The NDVI increased in the spring and autumn and decreased in the summer and winter. The spring made the largest vegetation contribution in all seasons. Vegetation cover was different from the area and the variation was positive in the central area but negative around the edges of Guizhou.

結(jié)果表明：22年來人人超碰人人操，研究區(qū)植被覆蓋呈增加趨勢秘书黄色网站，表明貴州省植被生態(tài)環(huán)境向好的方向發(fā)展欧美三级美国一级视频免费网站；貴州省平均植被覆蓋在春季和秋季呈上升趨勢，夏季和冬季呈下降趨勢黄色色黄色黄.co4级m黄色色黄黄色，其中春季對植被覆蓋總變化量的貢獻最大2019国产精品福利400；植被覆蓋程度增減因區(qū)域不同而異，變化程度呈增加的區(qū)域主要位于貴州省的中部地區(qū)人人干人人人摸；變化程度呈減小的區(qū)域分布在貴州省的四周邊緣久久黄色国产亚洲免费日韩网站。

Based on the established GIS of the Oncomcelania Snails' distribution in Dongting Lake, the author analyzes the environmental condition of the Oncomcelania Snails' habitates comprehensively by the spatial analyzing technology. The results are as following: firstly, the predominant vegetation of Oncomcelania Snails habitat is reed and sedgy. The habitats with reed has a higher livability than with sedgy as dominating vegetation. However, the diffusion of Oncomcelania Snails is much serious in the habitats with sedgy. Secondly ,the predominant soil type of the Oncomcelania Snails breeding area is temporary submergic paddy soils, which is in weak acidity environment, of that PH value is 5.5--7.5, and the organic content is in 2---3%. Thirdly, the 80 percent of the Oncomcelania Snails breeding area, the normalized difference vegetation index of that is in 0.100-0.375%, and the soil humidity of that is in 0.202—0.507, and the distance to the water of that is in 10-230 meters.

在已建立的洞庭湖區(qū)江灘釘螺分布地理信息系統(tǒng)的基礎(chǔ)上，運用GIS空間分析技術(shù)黄色一级操比视频，對釘螺孳生地的環(huán)境狀況作了比較全面的分析人人看黄片，發(fā)現(xiàn)洞庭湖區(qū)江灘釘螺孳生地植被類型主要為蘆葦和莎草類，釘螺在莎草地帶中的存活率高于蘆葦?shù)貛Ю怯?COM，而釘螺感染情況最嚴重的在蘆葦?shù)貛е校绘苌氐耐寥李愋椭饕獮殇笥运就?8禁强奸毛片；孳生地土壤PH值處于5.5-7.5之間的弱酸性環(huán)境国产毛片A片在线，有機質(zhì)含量處于2-3%之間；80%孳生地的植被標(biāo)化指數(shù)在0.100-0.375之間免费看老年人人人操人人爽、土壤濕度在0.202-0.507之間午夜电影院av、近水源距離為10-230之間美女牲高潮喷水毛片大全。

As a most commonly used method of urban vegetation investigation, stratified random selection investigation is the topic of this paper. Based on enormous publications and practical experiences, the authors proposed the systematic processes of investigation planning, with the details and points of attention for field work of urban vegetation survey introduced. The main body of urban vegetation investigation was divided into three parts, i.

本文以大量文獻和作者在城市植物調(diào)查的實踐經(jīng)驗為基礎(chǔ)，總結(jié)了國內(nèi)外城市植物研究中常用的分層隨機抽樣調(diào)查方法www啪啪，并對植物分層隨機抽樣調(diào)查方案設(shè)計的步驟日本免费观看黄色网站、方法及注意事項作了系統(tǒng)總結(jié)并提出相關(guān)建議，綜述性歸納了一套城市植物分層隨機抽樣調(diào)查的方案設(shè)計方法无码A级毛片视频免费播放。