The soils are derived from volcanic ash and consist of sandy to sandy-loam earth.

這里的土壤來(lái)源于火山灰和砂質(zhì)壤土。

Gramineae and Compositae by the shifting sand to the fixed sandy land, the species of which changed greatly, that indicated they were playing a great role in the recovery of the sands. Asclepiadaceae plants could serve as a indicative plants to distinguish between the types of shifting sand and other sand; Portulacaceae and Bibgnoniaceae plants, which appeared only in the fixed sandy land, has become a landmark to determine the fixed sand plants. In addition to artificially plant Caragana spp. and Artemisia spp.

豆科和藜科植物作為流動(dòng)沙地的先鋒物種国产一区日韩动图，表現(xiàn)出較強(qiáng)的適應(yīng)能力国产女优视频播放；禾本科和菊科植物由流動(dòng)沙地到固定沙地国产破处女出血视频，其種類變化較大iGao中文视频网为爱搞点激情，表明其在沙地恢復(fù)中發(fā)揮著巨大的作用国产福利网在线；蘿摩科植物可作為區(qū)分流動(dòng)沙地和其它沙地類型的指示性植物；馬齒莧科和紫薇科植物僅在固定沙地中出現(xiàn)久久久亚洲天堂，已成為判斷固定沙地的標(biāo)志性植物gogo全球高清国模私拍。

Brought forward and reasoned the forming mechanism of Maowusu sandy land. Based on the analysis of the development of Holocene rivers and related loess and windsandy geomorphology, the paper put forward the forming mechanism of Maowusu sandy land as follows: while the climate became dry, the exterior channels extended backwardly and cut through the remained lake system of ancient Hetao lake. This resulted in the rapid discharge of underground water. The vegetation living on this water resource was destroyed completely. Then the sand began to form.

對(duì)毛烏素沙地的形成機(jī)制進(jìn)行了新的探索基于對(duì)過(guò)渡地帶全新世河流及其相關(guān)的黃土和風(fēng)沙地貌發(fā)育、土地利用變化等分析思思久久成年人免费视频，提出毛烏素沙地的形成機(jī)制：在氣候變干的同時(shí)强奸高潮视频，外流河谷溯源延伸，切穿了長(zhǎng)城以北河套古湖殘遺湖系免费日皮视频亚洲网站，使地表地下水迅速外泄另类激情视频，原靠湖系水資源維系的生長(zhǎng)在河套古湖湖濱沙堤形成的沙地上的非地帶植被的生存條件被徹底摧毀，而起沙wwwbbbb。

Coast sand belongs to degraded sandy site, vegetation was the energy origin of whole ecosystem, so, this kind of vegetation must have the ability to get their ecological site on the badly degraded sandy site, on which Casuarina equisetifolia can live well, and show great adaptation.

海岸沙地的生態(tài)條件惡劣久久www.98riav.com，木麻黃可以在這樣的條件下生長(zhǎng)良好，并表現(xiàn)出了很好的適應(yīng)性在线a片视频。，必有其科學(xué)原理免费专区-iGAO视频网_为爱搞点激情。

The analysis of chorological and spatial changes of desertification indicates that expansion of desertification mostly takes place around the four main sandy lands: Keerqin, Hulunbeier, Hunshandake and Maowusu, while situation in the central part of sandy land is kept relatively steady, with some part of these areas tending to take a favorable turn.

通過(guò)沙漠化時(shí)空演變過(guò)程分析表明：沙漠化的發(fā)展主要集中在科爾沁沙地、呼倫貝爾沙地欧美偷拍99、渾善達(dá)克沙地和毛烏素沙地的邊緣国产中日韩久久久噜噜久久，而沙地的內(nèi)部則相對(duì)穩(wěn)定，部分地區(qū)有逆轉(zhuǎn)的趨勢(shì)插穴影院。

In order to explore the grain-size distribution characteristics and geo-genetic types of land desertification in Mo Us desert, the research on the grain-size characteristics of sediments since late Pleistocene has been carried out in the desert area and neighboring area such as inside desert, sand covered loess plateau, loess plateau and river valley. The research result shows that sediments of different geologic genetic types are the fundamental material source of sandy desertification in these areas and the distinguishing of different types of the sediments is the theoretical basis of classification of different geogenetic type of sandy desertification. The contribution of different geological roles on the land desertification and its significance to prevent and deal with the land desertification have also discussed.

為了研究毛烏素沙地沉積物的粒度特征與土地沙漠化的地質(zhì)成因類型色噜噜噜在线观看网站，通過(guò)系統(tǒng)研究沙地及相鄰地區(qū)晚更新世以來(lái)在沙地內(nèi)部、覆沙黃土區(qū)人人人人插人人干人人操、黃土高原和河流谷地與湖泊等不同地質(zhì)構(gòu)造地貌條件下所形成的沉積物粒度特征免费人人插人人操，指出不同地質(zhì)成因類型的沉積物是這些地區(qū)土地沙漠化的物質(zhì)基礎(chǔ)，區(qū)分不同類型的沉積物也是構(gòu)成不同地質(zhì)成因類型土地沙漠化分類的理論基礎(chǔ)国产在线网址，探討了不同地質(zhì)作用對(duì)土地沙漠化的貢獻(xiàn)及其對(duì)土地沙漠化防治方面的意義日本巨乳中文字幕在线。

The result of our experiments showed that PAM has little effect on sandy soil. We analyzed that it is because there are little fine glutinosity soil grain in sandy soil.

研究結(jié)果初步表明，PAM在砂性土壤中的施用效果不佳日本拍拍视频，據(jù)分析欧美黄网站网址，這是因?yàn)樯靶酝寥乐屑?xì)小粘粒含量較少，施加PAM后日韩人成精品视频免费播放在线，不能形成較多的水穩(wěn)性土壤團(tuán)聚體欧美特级黄色片AAAAXXXX。

Wei Dong belongs to reason of ancient Yellow River to, it is sandy wasteland more sparsely, involve 5 rural area 273 villages, total land 703 thousand mus, its intertill ground 519 thousand mus, appropriate forest sandy wasteland 178 thousand mus, 16.1% what occupy entire county area about.

衛(wèi)東屬古黃河故道，多是沙荒薄地6080午夜久草，涉及5個(gè)鄉(xiāng)273個(gè)村欧美三级视频免费，總土地70.3萬(wàn)畝免费人成在线观看爱品网，其中耕地51.9萬(wàn)畝，宜林沙荒17.8萬(wàn)畝国产亚洲欧美日韩精品A片，約占全縣面積的16.1%超碰97在线网。

It can provide some theoretic gist for resource value of water and soil in sandy land to indicate the change and law of soil moisture character, as well as the water circulation and balance mechanism in sandy land, at the same time, it have important practical significance to protect limited water resource, improve using efficiency of water resource,control desertification, choose and educate sand binding plant, renew and restore degraded ecosystem, as well as the economy benefit of irrigative agriculture and intending trend of development.

揭示沙地土壤水分特征的變化規(guī)律以及沙地水循環(huán)和平衡機(jī)理，可以為沙地水土資源評(píng)價(jià)提供一定的理論依據(jù)大逼视频，同時(shí)對(duì)于保護(hù)當(dāng)?shù)赜邢薜乃Y源和提高水資源的利用效率国产毛片短激情视频，以及沙漠化防治，固沙植物的選育手机日韩精品一区二区亚洲AV，退化生態(tài)系統(tǒng)的恢復(fù)與重建中文字幕不卡毛片网址，灌溉農(nóng)業(yè)的經(jīng)濟(jì)效益和未來(lái)的發(fā)展趨勢(shì)都具有重要的實(shí)踐意義。

Along the low-angle overthrust Early Permian marble and Early Triassic sandy slate were thrust southward over Paleocene-Eocene purplish red conglomerate of the Paleocene-Eocene Fenghuoshan Group and brick-red sandy conglomerate of the Oligocene Yaxicuo Group, forming many klippen of varying scales, and thick fault brecci.

沿低角度逆沖斷層亚洲熟妇天堂久久，早二疊世大理巖和早三疊世砂板巖自北向南逆沖推覆于古新統(tǒng)—始新統(tǒng)風(fēng)火山群紫紅色礫巖和漸新世磚紅色砂礫巖之上女被男啪到喷水视频网站，形成大量不同規(guī)模的飛來(lái)峰；沿主逆沖斷層發(fā)育厚層斷層角礫巖與斷層泥免费的不卡的av网站，局部形成碳酸鹽質(zhì)糜棱巖超碰人人妻人人妻。