Among the species we measured, the maximum water holding specie is Abelia chinensis, and the minimum is Cudrania tricuspidata, and the water holding capacity of Abelia chinensis is three times as Cudrania tricuspidata. The shrub and herbage amount of six forest types is Shrubbery and grass land, Pinus massoniana forest, Mixed conifer forest, Conifer and broadleaf forest, Broadleaf forest and Cupressus funebris forest in order. And the water holding amount of shrub and herbage have positive relative with their amounts.

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In the dry land and garden plot, the soil eroding amount of terraced fields is only 1/3 of that be ploughed directly along the slope. It is difficult that assart along the contour in the dry land and garden plot, after the first 1~2 years, the soil eroding amount will increase at double. From the soil and water conservation point of view, the mode that integrates arbor, shrub and grass in woodland is the best, the mode that plants grass in bare land is the second.

等高作梯的旱耕地和園地土壤侵蝕量?jī)H為順坡直耕的早耕地和園地順坡的1/3左右；早耕地自拍日韩葡萄影院在线观看视频、園地等高開(kāi)墾的強(qiáng)度大免费看一级黄色视频，開(kāi)墾之后1~2年土壤侵蝕量成倍增長(zhǎng)；從水土保持角度看91综合久久婷婷久久，林地喬欧美性高潮视频、灌、草結(jié)合模式最好免费Av青草网站，裸地植草模式次之91自拍视频在线看。

In this paper, as a case of Karamay, we have studied on space-time changement of soil quality in oasis of arid area. We measured quality for different land use types and years in same type by combinativing field sampling for Karamay in Xinjiang and analysis in laboratory, which is directed by former theory of soil quality. Then we did integrated evaluation of soil quality for different land use types, and had drew some conclusions as followed: In four land use types, the soil bulk density of layers(0～15cm) for farmland and tree land is bigger than the other land use types.The organic matter of every layer in manpower Tamarix Bulrush land is bigger; organic matter of Tamarix Bulrush land release efficiency nitrogen which result ration of C/N is higher; total nitrogen of all layers in farmland variety great as being effected by mass use of nitrogen in agriculture; deadwood and defoliation of tree国产国语对白丝袜美女A片、shrub and bulrush pooled in 5cm layer to result that quick nitrogen is the biggest among all layers. The total salt of nature shrub tree land for every layer being bigger than farmland explain that nature shrub thee land strongly stand salt and farmland for basification in this area; that the nutrient of face layer is bigger than the ground layer may be explained by that vegetation gather nutrient to be stored in deadwood and defoliation.

本文對(duì)以克拉瑪依為例WWW·日本熟妇人色视频，對(duì)干旱區(qū)綠洲土壤質(zhì)量的時(shí)間空間變化進(jìn)行研究，在有關(guān)土壤質(zhì)量的研究理論指導(dǎo)下色综合16p，通過(guò)田間調(diào)查取樣和室內(nèi)分析相結(jié)合的方法欧美男人天堂网，對(duì)新疆克拉瑪依市農(nóng)業(yè)開(kāi)發(fā)區(qū)的不同土地利用方式及同一土地利用方式下不同利用年限土樣土壤理化性質(zhì)進(jìn)行測(cè)定，從而對(duì)新墾綠洲不同土地利用類(lèi)型土壤質(zhì)量進(jìn)行綜合評(píng)價(jià)欧美一级久久真人浪潮，結(jié)果如下：四種土地利用方式中欧美高清在线视频看片在线观看免费，農(nóng)地、喬木林地表層(0-15cm)土壤容重較大色哟哟影视基地；各土層人工檉柳蘆葦?shù)氐耐寥烙袡C(jī)質(zhì)含量均較大a片在线观看哟哟哟；檉柳蘆葦?shù)氐挠袡C(jī)質(zhì)在礦化過(guò)程中所釋放出有效氮，導(dǎo)致檉柳蘆葦?shù)氐腃/N比例較高456小视频；受到農(nóng)業(yè)耕作使用大量氮肥的影響69免费视频，農(nóng)地各土層全氮含量變異較明顯乐播三级黄三区视频免费；喬木、灌木及蘆葦?shù)目葜β淙~主要集中在5cm范圍之內(nèi)日本三级欧美三级人妇视频，導(dǎo)致幾種土地利用方式類(lèi)型下該層土壤速效氮最大国家aaaa级黄片；天然灌木林地的土壤總鹽在各層均較大，其次是農(nóng)地视色4se，說(shuō)明天然灌木林地的高耐鹽能力欧美性爱欧美精品二区，以及該區(qū)農(nóng)業(yè)生產(chǎn)用地的土壤鹽堿化程度較重。

They looked at birds in different areas of vegetation, including intact forest, plantations and shrub land.

他們研究了在不同植被地區(qū)的鳥(niǎo)類(lèi)5566综合网，其中包括原始森林国产美腿美女被操，種植園和灌木林地。

Dasiphora fruticosa shrub-land is very common grazing land in Tibet plateau. After overgrazing , its soil physical and chemical characteristics would be out of balance.

金露梅灌叢是東祁連山廣泛分布的一種放牧地国产精品不卡一区，長(zhǎng)期的過(guò)度利用下永久在线观看国产日韩va，使其土壤理化性質(zhì)發(fā)生了相應(yīng)的變化。

By analyzing soil quality of 4 kinds of land use types in Kalamay agriculture development area according to principal component analysis, we draw the conclusions: nature shrub tree land is affected little by mankind, a great deal of organic matter return to soil every year, and root system can improve soil physical quality, can absorb salt from soil, so the soil quality of nature shrub tree land is the best; the soil quality of farmland is better than the soil quality of manpower Tamarix Bulrush land, which may be reasoned that man make for soil quality by irrigation to exclude salt and fertilizing organic muck in the earlier oasis digging up period. Soil physical qualities of tree land get harden and worsen for flooding irrigation, furthermore climate in Kalamay is dry and rainless , the other irrigation is very long time after the former one, so soil get harden severity and result soil physical quality get worse and worse.

利用主成分分析法分析新疆克拉瑪依農(nóng)業(yè)開(kāi)發(fā)區(qū)四種土地利用方式下的土壤質(zhì)量www.baoru.com，得出：天然灌木林地亚洲色影院网站，受人為影響較小，每年有大量有機(jī)物質(zhì)返還土壤亚洲色久悠悠A∨明星换脸，且天然灌木的根系可以很好的改良土壤的物理性質(zhì)黄色视频国产在线，同時(shí)所選天然灌木林灌木多是耐鹽堿并且本身又具有吸收積累來(lái)自土壤的鹽分，土壤質(zhì)量最好又粗又大特黄片；農(nóng)田受到的人為影響最大欧美老妇乱码伦，但農(nóng)田綜合得分卻好于人工檉柳蘆葦?shù)鼐C合得分，這可能是由于在開(kāi)墾初期的綠洲農(nóng)田天天色综合av，受到了人們灌水壓鹽及增施各種有機(jī)無(wú)機(jī)肥料等有利于土壤質(zhì)量提高的措施所致国产看黄一区；喬木林地，由于人們用大水漫灌的方式灌溉国产精品永久免费自在线观看，致使林地土壤變得板結(jié)亚洲欧美激情小说图片，土壤物理性質(zhì)下降，加上克拉瑪依地區(qū)氣候干燥少雨www.slgxq.com，一次灌溉后較長(zhǎng)時(shí)間后才有下一次灌溉人人射AV网站，致使土壤理化性質(zhì)惡化，土壤質(zhì)量不高日韩视频在线免费播放。

This results indicated that peashrub shrubland created a favorable N condition for its invading the meadow and being invaded by birch forest, and played a important role in altering the successional direction of meadow→peashrub shrub land →birch forest.

盡管箭葉錦雞兒灌叢植物葉片與凋落物中全N欧美加勒比、全P濃度在大多數(shù)取樣點(diǎn)上都低于碩樺，但表層土中全N濃度高于碩樺和草甸操亚洲无码视频，且其土壤有機(jī)質(zhì)的供氮能力以及維持氮素能力都高于碩樺林和草甸激情视频在线网，表明，錦雞兒灌叢為侵入草甸和碩樺入侵提供了良好的養(yǎng)分條件嘿咻嘿咻无码免费视频，在該演替序列的發(fā)展過(guò)程中起了一定的推動(dòng)作用久久av中文字幕免费在线观看。

Seven different representative vegetation types of alpine grassland in Eastern Qilian Mountains, which were Rhododendron fruticosa shrub land, Salix cupularis fruticosa shrub land, Dasiphoru fruticosa shrub land, Polygonum grassland, Grass steppe, Swamp grassland and Kobresia grassland were selected to be experimental samples.

本文選取東祁連山七種具有代表性的高寒草地植被類(lèi)型作為試驗(yàn)樣地人人操天天操老太大逼人人操，即杜鵑灌叢(Rhododendron fruticosa shrub land)，高山柳灌叢(Salix cupularis fruticosa shrub land)hs视频网站，金露梅灌叢一片黄网站，珠芽蓼草地，禾草草地毛片网站无码，沼澤草地国产区影院，嵩草草地。

Mower is mainly applied to grassland, shrub land of mowing, cleaning and surface roughness of rangelands update, and transformation operations.

割草機(jī)主要適用于草場(chǎng)国产黑丝自拍、灌木林地的割草日韩欧美一、清理以及地表不平整牧場(chǎng)的更新、改造等作業(yè)欧美成a人v。

The reclamation mode of Qidashan iron mine is combination of the forest, garden, shrub, grass and fishery, which can be concluded concisely as follows: the flat field as garden and forest, the convenient water and traffic as meadow, the sloping field as shrub and grass, the low land as fishing pool.

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