In order to find out completely the soil-wheat contaiminated by heavy metals in Tianjin sewage farm, we collect samples on the dry land and examinate contents of heavy metals in soil-wheat system. Firstly, the anthor evaluates that soil irrigated by sewage that has been contaminated slightly, the main polluting factors are Cd and Zn, and then the anthor evaluates soil according to different regions, soil types and irrigating water. Secondly, the anthor analyzes content and enrichment ability of heavy metals in different part of wheat, evaluates wheat is contaiminated by Cd widespreadly, only few samples polluted by Zn.Finally the anthor put up correlative analysis about heavy metal contents in the soil-wheat system, as well as plant enrichment coefficient and some physico-chemical properties of soil, and establishes a prognostic model about heavy metal content among wheat spike, soil, soil types, PH, organic matter and salinity with the quantifying theory.The prognostic accuracy of primarily contaminative factors is the best with compound correlative coefficient examining, the model can be founded.With improvement of living level, people need cleaner food.

為全面了解天津市污灌區(qū)農(nóng)產(chǎn)品生產(chǎn)地土壤和旱地作物小麥的重金屬污染狀況国产精品日韩在线观看最大，我們于2004～2005年對(duì)全市污灌區(qū)的土壤和小麥進(jìn)行了采樣，在對(duì)該區(qū)土壤—小麥系統(tǒng)中六種重金屬元素(Cd高清A片一区、Cu、Pb亚洲AV免费在线观看、Zn亚洲黄色视频在线观看你懂的、Cr和Ni)的含量進(jìn)行檢測(cè)的基礎(chǔ)上，本文首先分析評(píng)價(jià)了污灌區(qū)農(nóng)田土壤的環(huán)境質(zhì)量總體已達(dá)到了輕度污染水平www.丝袜.com，主要的污染因子是Cd和Zn少妇31p，同時(shí)對(duì)污灌區(qū)農(nóng)田土壤分區(qū)縣、土壤類型和不同灌水類型進(jìn)行了評(píng)價(jià)全免国内国外A片；然后分析了重金屬在小麥不同部位的含量與富集能力操操操操操操黄片免费看，評(píng)價(jià)了污灌區(qū)旱地作物小麥普遍遭受了Cd的污染，只有個(gè)別樣點(diǎn)遭受了Zn的污染玖性殴美；最后對(duì)土壤—小麥系統(tǒng)重金屬含量間以及植物富集系數(shù)與土壤部分理化性質(zhì)間進(jìn)行了相關(guān)分析最新高清麻豆AV在线播放，由于土壤類型是定性變量，本論文以數(shù)量化理論建立了小麥穗實(shí)中重金屬含量與土壤中重金屬全量手机看片人人干日韩不卡z、土壤類型樱花草黄色一级视频、PH值、有機(jī)質(zhì)和全鹽量間的預(yù)測(cè)模型色玖玖在线，經(jīng)復(fù)相關(guān)系數(shù)檢驗(yàn)com.在线久久特，污灌區(qū)主要的污染因子Cd和Zn的預(yù)測(cè)精度最高，模型可以成立高潮毛片无遮挡高清视频播放。

However,the removal of soil noncrystalline aluminum with DCB soultioncaused an obvious decrease of soil SSA.3.The hydroxy aluminum in the interlayer of 1.4nm intergrade mineralhad an important negative effect on the cation exchange capacity ofsoil colloids.Its removal would cause a significant increase in CEC valuesof the soil colloids.4.Free aluminum was the major carrier of phosphate adsorption of soilcolloids.Particularly,the active aluminum had a decisive effect on thecapacity of phosphate adsorption of soil colliods.5.Addition to the effects of other soil constituents on soil surfaceproperties,it was thought that the effect of soil free aluminum,especially active aluminum on soil surface properties,deserved closeattention.

焦磷酸鈉ww.黄色视频、草酸銨、DCB日本乱伦精品网、檸檬酸鈉和NaOH提取的土壤鋁對(duì)提高土壤CECv国产一级特黄大片色视频泰斯特、AEC、PZC和PZNC起重要作用超碰av在线免费观看，尤以活性鋁的作用較大国产日产美产精品久久久久久久。2）用草酸銨處理除去鋁后，土壤比表面積變化不大或略有增加免费女人18毛片a级毛片视频；用DCB處理除去土壤鋁后三级片网站资源，土壤SSA明顯降低北京一级毛片全过程。3）層間羥基鋁對(duì)土壤膠體的陽離子交換量有顯著負(fù)貢獻(xiàn)，用檸檬酸鈉將之除去后花蝴蝶在线观看免费中文版，土壤膠體的陽離子交換量明顯增加www久久99～com。4）土壤膠體中的游離鋁是土壤膠體吸附磷的主要載體，尤其是其中的活性鋁女人高潮被爽到呻吟视频，對(duì)土壤膠體的磷吸附能力起決定性作用影音先锋欧美性爱资源网。5）除其它土壤組分對(duì)土壤表面性質(zhì)的影響外，土壤中的游離鋁国产午夜久久青草网站、尤其是活性鋁對(duì)土壤有關(guān)表面性質(zhì)的影響国产高清肏屄AV，值得引起特別的重視。

However, the key environmental factors for the topsoil (0-20cm) organic carbon lability were vegetation coverage, 20-30cm belowground biomass, 0-10cm,10-20cm and 20-30cm underground soil moisture, soil organic matter, soil labile Potassium and soil total Nitrogen content.

影響表層土壤活性有機(jī)碳含量最關(guān)鍵的環(huán)境因子是地上生物量170黄色网站www、0~10cm地下生物量日韩欧美啪啪一中文字暮、30~40cm地下生物量、20~30cm土壤含水量人人夜夜揉r精品国产、0~20cm土壤容重日本久久枸一、20~40cm土壤容重和土壤全N量；影響表層土壤有機(jī)碳活度最關(guān)鍵的環(huán)境因子則是植被蓋度黄片AA片播放久久久、20~30cm地下生物量黄色视频射了网站、0~10cm土壤含水量、10~20cm土壤含水量国产在线黄色网站、20~30cm土壤含水量国内a片在线视频、土壤有機(jī)質(zhì)、土壤速效K和土壤全N量费一级无码婬片A片AAA毛片。

With the soil planted the konjac as the investigation and study object and planted corn as CK, the soil organic carbon, soil active organic matter, soil entire nitrogen, edaphon quantity and edaphon community structure was determined. The change of soil carbon nitrogen, edaphon carbon nitrogen and edaphon bacterium and fungus was analyzed.

方法］以種植魔芋地的土壤作為調(diào)查研究對(duì)象爱爱免費视频网址，用種植玉米的土壤作為對(duì)照，測(cè)定土壤有機(jī)碳99re在线观看视频、土壤活性有機(jī)質(zhì)久久思思热视频、土壤全氮、土壤微生物量和土壤微生物群落結(jié)構(gòu)在线国产馆，分析土壤碳氮无码高清性爱、土壤微生物碳氮和土壤微生物細(xì)菌和真菌的變化。

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(jì)算土壤可蝕部分含量的方程国产福利在线观看，此方程的自變量包括土壤有機(jī)質(zhì)特级婬片欧美高清视频、碳酸鈣、沙粒含量国产亚洲日韩精品超碰、沙粘比久久成本大片免费播放，計(jì)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午夜a一级毛片视频网站在线免费观看，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)庫亚洲免费视频在线播放，完成了寧夏土壤可蝕性圖欧美偷拍视频xxxx，評(píng)價(jià)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；（3）農(nóng)業(yè)經(jīng)營對(duì)土壤風(fēng)蝕的影響及其評(píng)價(jià)激情性爱国内自拍，在分析寧夏農(nóng)業(yè)土壤遭受風(fēng)蝕特征的基礎(chǔ)上人人摸时时操天天爽人人插，首先討論了農(nóng)業(yè)活動(dòng)對(duì)土壤理化性質(zhì)的干擾，評(píng)價(jià)主要耕作栽培措施對(duì)土壤風(fēng)蝕的影響视频一区二区男人的天堂国产大片免费，選取粗糙度一级黃色视频一区二区三区、表面結(jié)皮、可蝕顆粒含量一级aa片视频、留茬和有效時(shí)間為指標(biāo)黄色视频在线观看aaaa级，用打分方法作了評(píng)價(jià)。

In Salsola passerina -Reaumuria soongorica community, the first ordination axes explains the salinization gradient, along the order of Caragana tibetica community,Salsola passerina-Oxytropis aciphylla community,and Reaumuria soongorica-Salsola passerine community,soil alkalization increases. The second ordination axis explains soil structure gradient, along the order of Caragana tibetica community, Reaumuria soongorica-Salsola passerina community and Salsola passerina community, soil texture becomes coarser. In the Stipa breviflora-Stipa grandis community, the first ordination axis indicates the soil water gradient, and the second ordination axes explains hydrothermal coupling gradient. In the Prunus mongolica-Ulmus glaucescens community, the first ordination axis explains the soil pH gradient, along the order of Ulmus glaucescens-Prunus mongolica community, Prunus mongolica-Potentilla fruticosa community, and Potentilla fruticosa-Prunus mongolica community, soil pH value reduces. The second ordination axis explains soil structure gradient, along the order Prunus mongolica-Ulmus glaucescens community, and Prunus mongolica-Potentilla fruticosa community, the contents of silt and clay increase, and soil texture suggests a fine trend.

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In Salsola passerina-Reaumuria soongoriea community, the first ordination axes explains the salinization gradient. along the order of Caragana tibetica community, Salsola passerina-Oxytropis aciphylla community, and Reaumuria soongorica-Salsola passerine community, soil alkalization increases. The second ordination axis explains soil structure gradient, along the order of Caragana tibetica community, Reaumuria soongorica-Salsola passerina community and Salsola passerina community, soil texture becomes coarser. In the Stipa breviflora-Stipa grandis community, the first ordination axis indicates the soil water gradient, and the second ordination axes explains hydrothermal coupling gradient. In the Prunus mongolica-Ulmus glaucescens community, the first ordination axis explains the soil pH gradient, along the order of Ulmus glaucescens-Pnuius mongolica community, Prunus mongolica-Potentilla fruticosa community, and Potentilla fnuicosa-Prunus mongolica community, soil pH value reduces. The second ordination axis explains soil structure gradient, along the order Prunus mongolica-Ulmus glaucescens community, and Prunus mongolica-Potentilla fruticosa community, the contents of silt and clay increase, and soil texture suggests a fine trend.

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Main contents of the course includes: related conceptions, matter of soil, soil texture, soil organic matter, soil humus, soil structure, soil moisture, soil air, soil acidity and soil alkalinity, soil colloid, cation exchange, soil former soil-forming process, soil classification, distributions and properties of soil great group in China (fores soil, steppe soil, main non-zonal soil, paddy soil, etc), soil erosion, soil contamination, soil utilization, conservation of soil resource, soil investigation, etc.

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Secondly was honeysuckle and peach tree wood.So,in poor karst area,in order to link environmental benefits,eco-efficiency and social and economic efficiency,it were best measures to plant prickly ash peel or honeysuckle.It can improve capability of holding nutrient in short phase.,also it were beneficial to soil fertility,and hold back soil erosion.Sampled soil in a camphor slope,through analyzed on soil nutritive elements,like that Ca,Mg,Cu,Zn,Mn,Mo,Si,Fe,we had a deeper understanding with soil ground erosion and underground soil leaks.

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Statistic analysis showed that soil temperature as the driving factor to the diurnal variation of soil respiration. Soil temperature and soil moisture were the dominant environmental factors affecting the seasonal variation of soil respiration and explained 87% of its variability. LAI and root biomass were positively related to soil respiration rate, indicating that biotic factors also affected the seasonal variation of soil respiration. However, soil properties such as soil organic content, total nitrogen content, and C/N ratio had poor correlations with soil respiration. Top-dressing nitrogen fertilizer increased soil respiration significantly.

統(tǒng)計(jì)分析表明：土壤溫度是玉米生態(tài)系統(tǒng)土壤呼吸日變化的驅(qū)動(dòng)因素18水女人一级黄色；土壤溫度和土壤水分是影響土壤呼吸季節(jié)變化的關(guān)鍵因素，二者可以解釋玉米生長季土壤呼吸時(shí)間變異的87%狠狠爱无码一区二区三区；LAI和根系生物量與土壤呼吸速率呈正相關(guān)91精选自拍，說明生物因子對(duì)土壤呼吸季節(jié)變化也有影響；土壤有機(jī)質(zhì)国产精品国产精品国产专区不卡、全氮和碳氮比等土壤理化特性與土壤呼吸速率的關(guān)系較弱有哪些黄色网址；玉米生長季追施氮肥明顯促進(jìn)土壤呼吸速率。