The Changyeh forest park is situated at middle the Gansu Corridor oasis plain, is in the unique environment, northern side has prospect Long Shoushan to work as the household, encircles in the northern countryside rural cottage link, south side prospect Qilian is boundless, the scenery sand dune is continuous, but south side the Jiulong Jiang narrow-leaved oleaster forest is green and luxuriant, in the garden the sand beach, the sunlight, the forest, the lake water and so on abut the urban district, from, the environment is graceful all day long, the ideal condition profound, is the ideal botanical garden good.

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The purpose of this study is to reveal the change characteristics of biological properties of sandy soil and its development trend under the establishment of C. microphylla plantations in flowing sand dune. With semi-moving sand dune and natural community as controls, the activities of phosphomonoesterase, saccharase, protease, urease, dehydrogenase and the Contents of microbial biomass C, N, P of the soil in an age sequence (5-, 10-, 22-year) of C.

為探討采用小葉錦雞兒固定流沙后，土壤生物活性的變化特點(diǎn)和發(fā)展趨勢国产A∨爱情动作片免费观看，選取5三级性视频、10、22年生小葉錦雞兒人工固沙群落為對象久久久久精品久久久久免费，以半流動沙丘和天然群落為對照十八女免费毛片，研究了人工固沙群落發(fā)育過程中土壤磷酸單酯酶、蔗糖酶人人干97、蛋白酶一级毛片特黄久久免费看按磨站、脲酶、脫氫酶的活性和微生物生物量C免费一级性交黄片无码、N永久免费男男在线观看全网站、P質(zhì)量分?jǐn)?shù)的變化特征。

An area of 290 hectares throughout the garden, located in a sand dune, this is a "palace on the sand dunes," said.

整個園林占地290公頃日韩精品图片观看网址大全下载，座落在一座沙丘上久久久久精品超国产，故也有"沙丘上的宮殿"之稱。

The results show that: comparing the contrast community(formed by enclosure management for restoring vegetation naturaly on sand-dune for 7 years),some positive aspects of the artificial communities were showed as follows: 1 The level of the species diversity was more higher;2the vertical structure was so complicated that the surface of sand-dune was covered by multiple layers of plants;3 t...

結(jié)果表明：1利用植物再生沙障治理流動沙丘可以形成具有多物種人人操人人插人人看人人爱、多層片好妞在线三级片、多層次垂直結(jié)構(gòu)的沙障群落，其水平結(jié)構(gòu)呈網(wǎng)格狀沙障結(jié)構(gòu)與障間小群落在空間上鑲嵌互補(bǔ)人人操人人超，均衡分布的格局99久久久国产一区二区三区，具有很好的防風(fēng)固沙和植被恢復(fù)效果；2再生沙障建植后第5年開始欧美www视频在线观看，沙障群落進(jìn)入了衰退時期欧美大屌插逼，適時采取科學(xué)的經(jīng)營管理措施對于維持沙障群落的穩(wěn)定，保障其效益的長期發(fā)揮是非常重要的日韩精品免费观看大全网站。

The sand dune landscape was not caused by tectonic movement,but by wind and different erosion,and the peat layers were formed in limnological environment in the wind-accumulating dune area.

該區(qū)沙山地貌并非新構(gòu)造運(yùn)動所致黄片在线浏览器，屬差異侵蝕作用的結(jié)果，泥炭層由風(fēng)積地區(qū)沙丘間湖沼沉積形成黑人大刚交亚洲。

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.

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Patterns in Nature: Sand A ridged sand dune sparkles under the Nevada sun.

一處山脊沙丘火花在內(nèi)華達(dá)州太陽之下大量在线男女网站视频。

Surface-consistent deconvolution using variable prediction step, and suppression of sand dune ringing;2. Spatiotemporal distribution of moisture content in sand dune s of the unirrigated forestation along the southern marginal zone of Gurbantunggut Desert;3. The concepts of sand land, sand dune and desertified land etc.

在實(shí)地調(diào)查和多年定位研究的基礎(chǔ)上，根據(jù)目前沙漠化過程研究的需要2021自拍偷拍视频，介紹了沙地日韩成人无码电影观看网址大全、沙丘、沙漠化土地等相關(guān)概念及其主要區(qū)別熟女丰满少妇一级毛片，闡述了沙地先锋影音国产、沙丘、沙漠化土地類型的劃分標(biāo)準(zhǔn)以及類型互換使用中應(yīng)該注意的問題欧美六九；通過分析影響沙漠化發(fā)展方向和過程的關(guān)鍵因素黄色一区2区，建立了沙漠化正、逆發(fā)展過程的地面判別指標(biāo)體系在线观看永久免费A片三皮，并討論了不同類型沙丘的主要來源十八以下勿进色禁网站永久、發(fā)展方向及轉(zhuǎn)換過程的判別方法。

Approximately 30,000 years ago, long on stable sand dune plant root, passes through the long time the decency, has formed the limestone, after the plant dies, the sand dune unceasing migration, causes these calcifications the limestone to reveal the surface, has formed the stalagmite which the present sees.

大約在3萬年前日韩一级电影WWW.COM，長在穩(wěn)定的沙丘上的植物根部精品大片在线免费，經(jīng)過長時間的風(fēng)化，形成了石灰?guī)r国产在线黄色，植物死后在线观看AV资源站捆绑，沙丘的不斷移動，使這些鈣化的石灰?guī)r露出地表99re视频在线这里精品，形成了現(xiàn)在所看到的石筍久久精品国产88久久综合。

In the fixed sand dune and half fixed sand dune in shallow groundwater, there are four districts among the soil from the underground watertable to the soil surface.

地下水埋深較大的固定半固定沙丘土壤含水量的總體變化趨勢是由上到下逐漸增大。