To study the spatial variability of the sandy desertification soil on the Erdos Plateau, the water content of top soil(0～30cm) under different landforms was measured, and analysed by geostatics methools; and; each layer's water content was measured on some typical soil profiles along the landform section.

為了研究鄂爾多斯夏初不同地形土壤水分的空間變異規(guī)律，本試驗(yàn)在鄂爾多斯高原幾種地形的沙質(zhì)荒漠化土壤上91精品自产拍不卡，用時(shí)域反射儀測定表層土壤(0～ 30 cm)的含水量，對表層土壤水分分布特征進(jìn)行分析；在不同地形部位選擇典型土壤剖面欧美性，測定各層土壤含水量。

The results show that the accumulated evaporation of serious saline soil is the largest among the three kinds of soils. It is caused by the high content of salt which can depress the ice point and prolong the period of soil freezing.

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The soil urease and invertase activity effected by Hg was investigated in different fertility soils. The results show that soil urease activity亚洲九九久久中文字幕、maximum reaction velocity (Vmax又粗又硬又大欧美69a√、Vmax/Km) and reaction velocity constant k have remarkably negative correlation with Hg concentration so that these can be used as ecological indexes of soil polluted by Hg, Km changes a little indicating that the reaction mechanism of Hg and urease is nonreversible competitive restraint. Urease of low soil fertility is more damaged by Hg than that of high soil fertility, with severe pollution at Hg concentration of 6.00 and 14.79mg/kg respectively; while invertase is less sensitive to Hg than urease. Cultural time has less influence on the relationship of soil enzyme and Hg concentration.

對不同肥力土壤脲酶和轉(zhuǎn)化酶活性受汞影響進(jìn)行了研究，結(jié)果顯示爱情岛论坛自拍亚洲品质福利，土壤脲酶活性欧美乱色伦图片区小说、最大反應(yīng)速度Vmax 、Vmax/Km和反應(yīng)速度常數(shù)k與汞濃度呈現(xiàn)顯著或極顯著負(fù)相關(guān)關(guān)系欧美黄色视频久久，表明其可作為土壤汞污染的生態(tài)指標(biāo)全部免费A级毛片免费看；米氏常數(shù)Km則變化較小，表明汞與脲酶作用機(jī)理為不可逆競爭抑制欧美性爱一级视频在线；低肥力土壤脲酶比高肥力土壤脲酶受汞毒害作用更強(qiáng)免费观看黄色网站视频免费观看黄色，當(dāng)汞濃度分別為6.00和14.79mg/kg時(shí)即達(dá)到嚴(yán)重污染；而轉(zhuǎn)化酶對汞的敏感性較差亚洲人妻网页；培養(yǎng)時(shí)間對土壤酶與汞濃度間關(guān)系影響較小欧美黄色A片免费在线观看。

The contents of organic matter, total nitrogen, phosphorus, iron, manganese, copper, zinc can be increased, and the contents of hydrolizable nitrogen and their forms , Fe-P, Al-P, Ca〓-P, all organic P forms, exchangeable and organic iron, manganese, copper, zinc are increased obviously in long-term application organic manure soil. Not only the contents of soil readily oxidizable carbon, humic acid, fuluic acid, and HA/FA value are increased and Kos value decreased but also the available nitrogen, phosphorus, iron, manganese, copper, zinc are kept more high level in the organic manure soils. Long-term mulching straw has similar role with organic manure for soil nutrient except for decreasing total phosphorus, available P, N and Ca〓-P, but its fertilizer efficiency is not better than organic manure.

有機(jī)肥還具有提高土壤易氧化碳和松結(jié)態(tài)腐殖質(zhì)含量，降低kos值√天堂中文www官网av，提高土壤HA在线日本高清www免费看、FA含量及其比值的作用，使土壤中有效態(tài)氮亚洲日本一区二区三区、磷亚洲网中文字幕、鐵、錳www.干干干.cao、銅和鋅含量處于中上等水平亚洲福利精品一区；長期秸稈還田除了不增加土壤全磷、有效氮和磷等外人人干人人操人人上，對其他養(yǎng)分的作用效果與有機(jī)肥相似亚洲xx视频，但其肥效不如有機(jī)肥；長期氮磷化肥單施欧美一区爽爽午夜福利视频，土壤全氮和磷增加日韩无码抽插黄片，有機(jī)質(zhì)、鐵国产美女高清自慰网站嫩草、錳亚洲无码在线天堂、銅和鋅含量下降，易氧化碳欧美人在线、松結(jié)態(tài)腐殖質(zhì)欧美大片性网址、HA和FA含量、kos和HA/FA值下降日韩插逼视频免费看；長期不施肥土壤有機(jī)質(zhì)色哟哟国产精品网站在线观看、全氮等養(yǎng)分處于消耗狀態(tài)一区二区三区熟女少妇视频。

The main results are: construction of Tarim desert highway shelter-forest promoted soil microbial development, and with increase of plantation time of the shelter-forest, the quantity, fatty acid diversity index of soil microbe and diversity index of bacterial DNA segment enhanced notably. As to soil microbial community structure, bacteria are dominant population with amounting for over 80% of total soil microbe, and fungi is not more than 1% of total soil microbe, but soil microbial community structure was different among three soil layers. The conclusions from study methods of conventional culture, biological marker and molecule biology were almost identical, which illuminates that construction of Tarim desert highway made soil microbial activity enhance and so promote nutrient cycle and utilization of Tarim desert highway shelter-forest land.

結(jié)果表明，塔里木沙漠公路防護(hù)林的建設(shè)促進(jìn)了風(fēng)沙土土壤微生物的發(fā)育a片无码在线观看网址，隨著防護(hù)林定植年限的增加3yz14.com，土壤微生物數(shù)量、脂肪酸和細(xì)菌DNA片段的多樣性指數(shù)明顯增大亚洲中文字幕性爱视频；土壤微生物區(qū)系組成中亚洲一级黄色片，細(xì)菌是優(yōu)勢類群，占微生物總數(shù)80%以上看免费老太婆一级毛片，而真菌很少91综合干，不到微生物總數(shù)1%，但在不同土層間有所差異欧美一级特黄A片免费看是日本牲；傳統(tǒng)培養(yǎng)法與現(xiàn)代生物標(biāo)記和分子生物學(xué)方法對塔里木沙漠公路防護(hù)林地土壤微生物多樣性的研究結(jié)果基本一致日本男女操逼大片免a费观看视频三区，說明塔里木沙漠公路防護(hù)林的建設(shè)使林地土壤生物活性有所增強(qiáng)，有利于林地土壤養(yǎng)分循環(huán)與利用黄色视频搞得啊啊啊叫。

It analyzed impact principle, and researched viscidity and springiness model of soil. So the relation of impact and soil was found, and the dynamic model of impact bar-soil system was established. After analyzing and researching the model, a better dynamic model with soil impact character was gained.

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The results indicated that corn stalk and stubble rationing application of N fertilizer would increase the content of soil microbial biomass carbon. Soil pH buffer capacity was strengthened. Soil aggregate structure was improved. Corn stalk and stubble remained in field would be helpful to maintenance and liberation of soil available nutrients...

結(jié)果表明：玉米秸稈和根茬留田可增加土壤微生物量碳的含量，較對照和單施化肥土壤微生物量碳分別增加38.4％～84.9％和27.2％～51.6％久久免费经典黄色视频；增強(qiáng)土壤pH值的緩沖性能；改善土壤團(tuán)聚體結(jié)構(gòu)91POPNY地址；有利于土壤中氮在线日韩片精品免费观看、磷、鉀欧美黑人黄色大片、銅WWW,色色色色色色色,、鋅、鐵能看黄的网站在线一区、錳等養(yǎng)分的釋放與調(diào)控精品精品国产日韩26u，為作物生長創(chuàng)造適宜的土壤生化環(huán)境。

The working performances of a tine and a subsoiler with adjustable wings were compared based on the soil surface condition of conservation tillage and the requirement of subsoiling.

保護(hù)性耕作條件下深松的特點(diǎn)與要求深松法是利用深松鏟疏松土壤久久频这里精品99，加深耕層而不翻轉(zhuǎn)土壤操女人的屄的网站，達(dá)到調(diào)節(jié)土壤三相比、改善耕層土壤結(jié)構(gòu)30分钟黄色视频永久免费的网站、減輕土壤侵蝕免费A级毛片aV无、提高土壤蓄水抗旱能力的目的国产xx视频在线。

The temporal and spatial distribution of SMP in tomato root zone and the correlation between tomato evaportranspiration and SMP variations were analyzed. The results showed that the variation of SMP among the soil profiles of 0, 15 and 30 cm from drip tape was insignificant, and the horizontal distance of tensiometers to drip tape had little effect on the correlation between tomato ETa and SMP variations. Lateral depths significantly influenced SMP from 20 to 70 cm soil layer and there were obvious effects of tensiometer depth on the correlation between tomato ETa and SMP variations.

對番茄根區(qū)土壤基質(zhì)勢時(shí)空分布和番茄耗水量與土壤基質(zhì)勢變化的相關(guān)性分析表明，水平距毛管0一级二级毛片18岁禁看视频黄,、15和30 cm 3個(gè)剖面間土壤基質(zhì)勢差異較小性久久，負(fù)壓計(jì)距毛管的水平距離對耗水量與土壤基質(zhì)勢變化的相關(guān)程度影響不大；毛管埋深對20～70 cm土層土壤基質(zhì)勢影響顯著黄大片视频，負(fù)壓計(jì)埋置深度對耗水量與土壤基質(zhì)勢變化的相關(guān)性影響顯著国内毛片免费A级视频，應(yīng)依據(jù)毛管埋深確定負(fù)壓計(jì)適宜埋置深度。

The mostly conclusion is as below: 1 The characteristic analysis of the expressway soil erosion: Expressway soil erosion is different from conventional soil erosion and other soil erosion of exploitation construction project for its 4 outstanding features, including imbalance of soil erosion distribution in time and space; Presenting either threadiness or pinnate distribution in space; The quantity of soil erosion is large;Erosion form is complicated and frequency of causality soil erosion occuring is large.

具體得出的主要結(jié)論如下： 1高速公路土壤侵蝕的特征分析公路建設(shè)土壤侵蝕區(qū)別于傳統(tǒng)的土壤侵蝕国内自拍日韩高清视频在线，與其它開發(fā)建設(shè)項(xiàng)目中的土壤侵蝕也有所區(qū)別在那里可以免费看啪啪，有自己突出的特點(diǎn)，主要表現(xiàn)為時(shí)間分布上不平衡日韩视频自拍第二页在线播放网站；空間上呈線狀或羽狀分布A片欧美AAAAAA；土壤侵蝕量大；侵蝕類型復(fù)雜黄片一级无码视频在线，誘發(fā)性土壤侵蝕發(fā)生頻數(shù)大4個(gè)方面性爱裸体视频。