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欧美公司中文字幕在线视频，我們于2004～2005年對全市污灌區(qū)的土壤和小麥進(jìn)行了采樣，在對該區(qū)土壤—小麥系統(tǒng)中六種重金屬元素(Cd国产vA视频在线、Cu人人揉人人操人人干、PbAV永久免费网站无毒不卡、Zn、Cr和Ni)的含量進(jìn)行檢測的基礎(chǔ)上欧美老熟妇最近裸体，本文首先分析評價(jià)了污灌區(qū)農(nóng)田土壤的環(huán)境質(zhì)量總體已達(dá)到了輕度污染水平国产无码盗摄视频，主要的污染因子是Cd和Zn，同時(shí)對污灌區(qū)農(nóng)田土壤分區(qū)縣18岁禁播网站、土壤類型和不同灌水類型進(jìn)行了評價(jià)色色色专区；然后分析了重金屬在小麥不同部位的含量與富集能力，評價(jià)了污灌區(qū)旱地作物小麥普遍遭受了Cd的污染亚洲狂插，只有個(gè)別樣點(diǎn)遭受了Zn的污染9色视频91P0RNY；最后對土壤—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，由于土壤類型是定性變量国产黄片AV无码，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国产人成网线在线播放va、土壤類型、PH值特级黄色视频毛片、有機(jī)質(zhì)和全鹽量間的預(yù)測模型男人的视屏超碰女人帮，經(jīng)復(fù)相關(guān)系數(shù)檢驗(yàn)，污灌區(qū)主要的污染因子Cd和Zn的預(yù)測精度最高久久免费A级毛片高清在钱，模型可以成立国产色妇女在线视频。

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、草酸銨玖玖在线视频、DCB91精品国产综合久久小仙女、檸檬酸鈉和NaOH提取的土壤鋁對提高土壤CECv、AEC女人免费A片视频、PZC和PZNC起重要作用国产精品电影在线你懂的，尤以活性鋁的作用較大。2）用草酸銨處理除去鋁后一级a黄色视频录像免费，土壤比表面積變化不大或略有增加；用DCB處理除去土壤鋁后91午夜福利国产在线播放，土壤SSA明顯降低天堂av中文在线。3）層間羥基鋁對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色哟哟免费看，土壤膠體的陽離子交換量明顯增加粉嫩国产剧情在线观看网站大全。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一级α爱作爱视频免费观看，對土壤膠體的磷吸附能力起決定性作用一级一a片。5）除其它土壤組分對土壤表面性質(zhì)的影響外，土壤中的游離鋁日本特级黄大片、尤其是活性鋁對土壤有關(guān)表面性質(zhì)的影響黄色美女裸体网站，值得引起特別的重視欧欧美一级清。

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、0~10cm地下生物量尹人香蕉免费一级毛片、30~40cm地下生物量免费人成网站视频观看点击进入、20~30cm土壤含水量、0~20cm土壤容重国产综合久久久久、20~40cm土壤容重和土壤全N量涩涩在线播放视频视频；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、20~30cm地下生物量超碰黄色1、0~10cm土壤含水量老嫖客精品视频在线播放免费、10~20cm土壤含水量、20~30cm土壤含水量色色色色鬼、土壤有機(jī)質(zhì)综合区图片区视频区亚小说区、土壤速效K和土壤全N量。

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)查研究對象久久综合色88888，用種植玉米的土壤作為對照久久国产精品一区，測定土壤有機(jī)碳、土壤活性有機(jī)質(zhì)干荡妇免费视频一区二区、土壤全氮中文字幕在线看一区二区、土壤微生物量和土壤微生物群落結(jié)構(gòu)，分析土壤碳氮麻豆精品视频在线视频、土壤微生物碳氮和土壤微生物細(xì)菌和真菌的變化求黄色免费网站。

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，此方程的自變量包括土壤有機(jī)質(zhì)中文字幕一区二区、碳酸鈣狂野欧美性激色啪XXXX网站、沙粒含量、沙粘比久草视频在线免费观，計(jì)算了寧夏主要土壤類型表層的可蝕含量一级花片免费直接观看，進(jìn)而比較它們的可蝕性，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wwwbbbbcom，完成了寧夏土壤可蝕性圖5566资源在线，評價(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)營對土壤風(fēng)蝕的影響及其評價(jià)久久精品国产精品青草色艺，在分析寧夏農(nóng)業(yè)土壤遭受風(fēng)蝕特征的基礎(chǔ)上一级e片网站，首先討論了農(nóng)業(yè)活動(dòng)對土壤理化性質(zhì)的干擾，評價(jià)主要耕作栽培措施對土壤風(fēng)蝕的影響麻豆九一PORNY，選取粗糙度白白色在线观看视频、表面結(jié)皮、可蝕顆粒含量成黄色激情视频网站、留茬和有效時(shí)間為指標(biāo)色哟哟中文字慕，用打分方法作了評價(jià)国产一级视频性交。

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.

在珍珠豬毛菜-紅砂群落，第一排序軸反映了土壤鹽堿化梯度午夜性生活免费视频，沿著藏錦雞兒群落—珍珠豬毛菜国产嫖妓凹凸视频、貓頭刺群落—珍珠豬毛菜、紅砂群落序列人人看人人摸人人操人人色，土壤鹽堿化程度不斷增強(qiáng)有色有爽；第二排序軸則反映了土壤結(jié)構(gòu)梯度，沿著藏錦雞兒群落—珍珠豬毛菜免费欧美在线、紅砂群落—珍珠豬毛菜亚洲女优操逼色视频、貓頭刺群落序列，土壤質(zhì)地逐漸粗化免费一级特大爱黄片；在短花針茅-大針茅群落欧美很鲁视频在线观看，第一排序軸反映了土壤水分梯度，第二排序軸反映了海拔梯度上的水熱組合梯度日本sewwwcom；在蒙古扁桃-灰榆群落久久夜色精品国产欧美一，第一排序軸反映了土壤pH梯度，沿著灰榆2020国内自拍视频、蒙古扁桃群落—蒙古扁桃国产AV无码片毛片一级下载、金露梅群落—蒙古扁桃群落序列，土壤pH值逐漸下降老女人黄色网站；第二排序軸主要反映了土壤結(jié)構(gòu)梯度黄色网站永久，沿著蒙古扁桃群落—灰榆、蒙古扁桃群落—蒙古扁桃搞黄真人网站、金露梅群落序列2021国产精品区在线观看，土壤中粉粒、粘粒含量逐漸增加日骚逼视频，土壤質(zhì)地呈細(xì)化趨勢伊人久久大香线蕉综合网蜜芽。

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.

在珍珠豬毛菜－紅砂群落，第一排序軸反映了土壤鹽堿化梯度黄色大片A片，沿著藏錦雞兒群落－珍珠豬毛菜美女视频免费视频一区二区、貓頭刺群落－珍珠豬毛菜、紅砂群落序列美国一级片大全，土壤鹽堿化程度不斷增強(qiáng)；第二排序軸則反映了土壤結(jié)構(gòu)梯度人人肉人人摸人人操，沿著藏錦雞兒群落－珍珠豬毛菜亚洲欧美日韩人妻视频、紅砂群落－珍珠豬毛菜、貓頭刺群落序列午夜国产屁股大美女特黄大片，土壤質(zhì)地逐漸粗化欧美激情专区在线；在短花針茅－大針茅群落18分钟处破之好疼在线观看，第一排序軸反映了土壤水分梯度，第二排序軸反映了海拔梯度上的水熱組合梯度91福利网国产；在蒙古扁桃－灰榆群落国产免费一级毛卡片AAAAA级，第一排序軸反映了土壤pH梯度，沿著灰榆人人操人人干强奸、蒙古扁桃群落－蒙古扁桃欧美14初处破在线播放、金露梅群落－蒙古扁桃群落序列，土壤pH值逐漸下降欧美日韩人妻97；第二排序軸主要反映了土壤結(jié)構(gòu)梯度中日韩美女啪啪啪一级黄片，沿著蒙古扁桃群落－灰榆、蒙古扁桃群落－蒙古扁桃黄色毛片AAA视频、金露梅群落序列很黄的吸乳A片免费视频，土壤中粉粒、粘粒含量逐漸增加亚洲国产精品一区二区首页，土壤質(zhì)地呈細(xì)化趨勢日日干日日。

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.

土壤地理學(xué)是地理科學(xué)專業(yè)的主要基礎(chǔ)課程之一，是一門必修課程在线免费黄视频；要求掌握土壤地理學(xué)基本的理論性爱免费网、知識(shí)和方法；主要內(nèi)容有：有關(guān)概念深夜刺激网站、土壤組成物質(zhì)自拍日韩动漫欧美在线观看网站、土壤質(zhì)地、土壤有機(jī)質(zhì)又硬又黄又粗又爽又长又深、土壤腐殖質(zhì)91亚洲精品视频、土壤結(jié)構(gòu)、土壤水分欧美性爱亚洲性爱日本性爱A∨、土壤空氣亚洲色全情网站大全、土壤酸堿性、土壤膠體人人操人人看人人做、土壤陽離子交換免费黄色看直接网站、土壤形成因素、土壤形成過程亚洲久aa、土壤分類99re视频在线蜜、中國主要土壤類型（森林土壤、草原土壤农村老熟妇乱子仑视频、主要的非地帶性土壤亚洲欧美日韩中文视频在线观看、水稻土等）的分布及其性質(zhì)、土壤侵蝕国产免费乱在线观看、土壤污染可以进去的黄片、土壤資源的利用與保護(hù)亚洲zaixianguankan、土壤調(diào)查研究等。

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.

通過時(shí)間對比分析欧美老妇与小伙子性生交，得出不同土壤利用方式下土壤養(yǎng)分保持能力和土壤退化的變化趨勢欧美色精品视频免费，提出運(yùn)用土壤指紋電荷方法對某一研究區(qū)域的土壤養(yǎng)分保持能力進(jìn)行研究，可以減少研究區(qū)土壤的破壞程度女同精品一区二区三区，只要前期充分展開相關(guān)指紋電荷工作研究看黄的网战，制作圖譜，后期研究則只需取少量土壤測定土壤pH值后查詢前期土壤指紋電荷圖譜即可得出某時(shí)段內(nèi)土壤養(yǎng)分保持能力的變化趨勢：通過對重慶南平鎮(zhèn)石慶村人為生態(tài)恢復(fù)區(qū)不同土壤利用方式下前后一年土壤樣品的分析女同在线视频一区二区，得出退耕后撂荒草地土壤的各項(xiàng)養(yǎng)分保持指標(biāo)含量增長最快黑人巨茎精品欧美一区二区，對恢復(fù)土壤退化程度最為有利，其次是杉樹林和樟樹林日韩孕妇自拍视频直播网站在线观看；而從人為生態(tài)恢復(fù)的各種利用方式來看欧美性爱电影免费在线观看，花椒林土壤的養(yǎng)分保持能力最好，土壤退化恢復(fù)的程度最快黄a淫荡视频，其次是金銀花和桃林永久免费毛片在线看视频。

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；土壤溫度和土壤水分是影響土壤呼吸季節(jié)變化的關(guān)鍵因素最近中文免费资源，二者可以解釋玉米生長季土壤呼吸時(shí)間變異的87%美国婬片A片AAA毛片；LAI和根系生物量與土壤呼吸速率呈正相關(guān)，說明生物因子對土壤呼吸季節(jié)變化也有影響欧美精品视频国；土壤有機(jī)質(zhì)桑拿喝酒国产精品久久久久精品te、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；玉米生長季追施氮肥明顯促進(jìn)土壤呼吸速率国产在线吧直达。

soil acidity：土壤酸度,土壤酸性

soil abundance 土壤資源豐富 | soil acidity 土壤酸度,土壤酸性 | soil adhesion 土壤附著力,土壤粘附

soil capillarity：土壤毛,土壤毛細(xì)管作用

soil capacity 土壤耐壓力,土壤能力 | soil capillarity 土壤毛,土壤毛細(xì)管作用 | soil capital 土地資本

edaphic climax：土壤頂極群落

1 土壤分析-土壤分析土壤頂極群落 土壤頂極群落(edaphic climax)是指最能反映土壤因子的頂極群落. 換句話說,由于地區(qū)土壤條件的關(guān)系,沒有產(chǎn)生以氣候因子為主導(dǎo)的頂極群落,與該地區(qū)土壤相適應(yīng)的植生,

soil microbiology：土壤微生物學(xué)

土壤微生物學(xué) (soil microbiology)微生物學(xué)的1個(gè)分支學(xué)科. 它研究土壤微生物的種類、數(shù)量毛片一区在线视频、分布国产综合九色免费、生命活動(dòng)規(guī)律及其與土壤中的物質(zhì)和能量轉(zhuǎn)化、土壤肥力国产免费特黄视频、植物生長等的關(guān)系(見土壤微生物區(qū)系). 因此,它又是土壤學(xué)的一個(gè)組成部分,

soil productivity：土壤生產(chǎn)力

土壤的植物生產(chǎn)性能還可以用土壤生產(chǎn)力(soil productivity) 即土壤產(chǎn)出農(nóng)產(chǎn)品的能力加以描述. 土壤生產(chǎn)力高低除受到土壤肥力的影響外,還受到環(huán)境條件及植物本身因素的影響. 土壤肥力僅僅是土壤生產(chǎn)力的基礎(chǔ)之一,要提高土壤生產(chǎn)力,

soil profile：土壤剖面

而我們挖開一個(gè)土洞所看見的其中一個(gè)面,稱為土壤剖面(soil profile). 在一個(gè)地區(qū)所見的相同土壤,均是由此土壤樣體聚集組合而生成的,則稱為土壤樣體群(poly-pedon)或直稱為某一類土壤之名稱(如黑色土等). 土壤剖面(soil profile),

soil stratigraphy：土壤地層學(xué);土壤層位學(xué)

soil sterilization 土壤殺菌;土壤消毒 | soil stratigraphy 土壤地層學(xué);土壤層位學(xué) | soil structure 土壤構(gòu)造

Soil Taxonomy：美國土壤系統(tǒng)分類

但這個(gè)分類與國際上的二個(gè)主流分類--美國土壤系統(tǒng)分類(Soil Taxonomy)和國際土壤學(xué)會(huì)的WRB分類都不一樣,這樣使中國土壤學(xué)家參與國際交流或國外土壤學(xué)家了解中國土壤都造成了極大的困難,因此,需要建立一個(gè)"中國土壤參比系統(tǒng)",

edaphology：土壤學(xué)

耕作土壤學(xué) 耕作土壤學(xué)(edaphology)側(cè)重研究土壤的組成80后操B拍拍、性質(zhì)及其與植物生長的關(guān)系,通過耕作管理提高土壤肥力和生產(chǎn)能力的土壤學(xué). 1 耕作土壤 概念特點(diǎn)

soil equilibrated phosphorus：土壤磷的平衡

soil enzyme activities ==> 土壤酶活性 | soil equilibrated phosphorus ==> 土壤磷的平衡 | soil erosion ==> 土壤沖刷,土壤浸染,土壤侵蝕,土壤溶蝕作用