Clean water and cultivable lands have become the most important strategic resource in 21st century, water and soil is the foundation of the life. Its the shared responsibility of all the people in the world to protect soil and water resources.

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Habitat utilization of root vole was studied in the region of Haibei Alpine Meadow Ecosystem Research Station, the Chinese Academy of Sciences, from July to September of 2002 and 2003. Three indexes of activity intensities, runway length, runway branch number and burrow entrance number were used to estimate root vole's utilization intensities on four types of habitats, manual cultivated land, true meadow, swamp meadow and Dasiphora fruticosa shrub.

為研究根田鼠對不同類型棲息地的利用強(qiáng)度，于2002-2003年的7-9月在中國科學(xué)院海北高寒草甸生態(tài)系統(tǒng)定位站地區(qū)采用樣方法測定了4種類型棲息地（人工耕作地日本三级电影在线视频、真草甸一级黄色视频在线免费播放A级、沼澤化草甸、金露梅灌叢）中的3個根田鼠活動強(qiáng)度變量（跑道長度人人艹人人莫、跑道分叉數(shù)午夜网站加勒比我污、洞口數(shù)）国产黄在线视频。

The rate of contribution of various edaphic physical parameters is different from parameter of soil water infiltration model in different soil texture and husbandry condition, so independent variable factor and priority are different in regression models.

在不同的土壤質(zhì)地和不同的耕作條件下，土壤的各種物理參數(shù)對土壤的水分入滲模型參數(shù)影響程度不同欧美精品午夜理论片在线播放情事，因此引入到回歸模型中的自變量因子不同豪妇荡乳1一5潘金莲，引入的先后次序不同。

The soil erodibilities are compared and appraised for the majority of the soil types in Ningxia. The method published by D. W. Fryrear et al is adopted to calculate erodible fractions for the soils in Ningxia. The erodibilities of main soil types are compared and analyzed. Spatial distribution of soil erodibilities in the region can be perceived on the Map of Ningxia Soil Erodibility. The map is based on the digitized map of soil types of the all region by means of the geographical information system of Region Manager. Evaluation results show that erodible soils occupy a large portion of the total area of the region.(3) The third task is evaluation of effects of human activities for farming on soil erodibility. Tillage and cultivation can alter soil properties. The paper, based on the discussion on the characteristics of farmland suffering wind erosion in the region, analyzes the contents and intensities of farming disturbing surface soil. Emphasis is paid on the effect of farming on erodibilities of each type of soil.

W Fryrear等人的計算土壤可蝕部分含量的方程黄色网站免费进入入口，此方程的自變量包括土壤有機(jī)質(zhì)亚洲区四区、碳酸鈣、沙粒含量黄色AV免费的网站、沙粘比毛片网在线观看，計算了寧夏主要土壤類型表層的可蝕含量，進(jìn)而比較它們的可蝕性欧美乱伦视频啊啊，并以寧夏土壤分布圖為底圖用地理信息系統(tǒng)建立了寧夏土壤風(fēng)蝕數(shù)據(jù)庫超碰网址在线，完成了寧夏土壤可蝕性圖，評價結(jié)果顯示寧夏地區(qū)主要的土壤類型較容易遭受風(fēng)蝕人人干人人玩；（3）農(nóng)業(yè)經(jīng)營對土壤風(fēng)蝕的影響及其評價，在分析寧夏農(nóng)業(yè)土壤遭受風(fēng)蝕特征的基礎(chǔ)上a4yy一级午夜福利，首先討論了農(nóng)業(yè)活動對土壤理化性質(zhì)的干擾成年人在线免费观看小视频，評價主要耕作栽培措施對土壤風(fēng)蝕的影響，選取粗糙度日韩精品专区在线播放免费、表面結(jié)皮十八岁禁看的网站、可蝕顆粒含量、留茬和有效時間為指標(biāo)人妻系列爽爽无码专区久久69堂，用打分方法作了評價91亚洲女性自拍图片库。

In this paper, the biological characteristics of florescence, spikelet and inflorescences structure, morphogenesis formation of inflorescence, megasporogenesis and the development of female gametophytes were studied systematically by using anatomy structure, scanning electron microscopic and paraffin section methods. The results were as followed:(1) Phyllostachys praecox was the bamboo flowering fragmentarily; the cultivation changed the characteristic of flowering; the plantlets of flowering were complex and splitted into three kinds: the plantlet flowering before continued flowering; the plantlet flowering before stopped flowering and the plantlet changed into flowering. The inflorescence of Ph. praecox was indefinite inflorescence or called false inflorescence, and actually it was flower stress structure. Its basal unit was pseudospikelet with two kinds: apical spikelet and lateral spikelet. The floret had one lemma, one pelea, three stamens, one pistil and three lodicules.

本研究綜合運(yùn)用形態(tài)解剖學(xué)、掃描電鏡www.色色色五月天、石蠟切片等技術(shù)手段男人视频天堂剧情111，對雷竹花期生物學(xué)特性、小穗與花序構(gòu)造久久久久精品无码AⅤ、花序形態(tài)建成過程全网黄色网站在线看、大孢子發(fā)生與雌配子體發(fā)育等進(jìn)行了較為系統(tǒng)的研究，結(jié)果表明：(1)雷竹為零星開花竹種欧美亚洲国产一区二区三区VA，耕作條件對其開花特性具有重要影響91无码专区WWW；開花植株類型復(fù)雜多樣，可以分為以前開過花現(xiàn)在繼續(xù)開花一级一级一级一级一级片、以前開過花現(xiàn)在停止開花以及以前未開過花現(xiàn)在轉(zhuǎn)為開花等3種類型天天夜夜人人爽人人爽；雷竹花序?yàn)闊o限制花序或稱&假花序&，實(shí)為花枝結(jié)構(gòu)国产自产拍一区精品，基本單位為&假小穗&欧美疯狂操逼；假小穗有頂生和側(cè)生之分亚洲VS天堂；小花具內(nèi)外稃各1枚，雄蕊3国产熟在线视频，雌蕊L(fēng)AAA黄色视频在线观看，另具3枚大小不等之鱗被。

A farmer who cultivates his own land, especially a member of a former class of small freeholding farmers in England.

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Corolla white or yellow, rarely red or purple, salverform or funnelform; lobes 4-16, imbricate in bud, sometimes doubled in cultivation.

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Each year geoponic consume a high percentage of the world's energy in China.

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Implementation of conservation tillage, decrease of chemical fertilizer application, increment the rate of straw returning to field and organic fertilizer, should be the primary regulation direction of geoponic management in the future.

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Implementation of conservation tillage, decrease of chemical fertilizer application, increment the rate of straw returning to field and organic fertilizer, should be the primary regulation direction of geoponic management in the future.

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