They are jinfo mountain in nanchuan county ( natural protection section ), wuling mountain in qianjiang county ( national emphases forest demonstration county which forest cover rate is beyond 50 % ) and zhongliang mountain in beibei county ( artificial destruction is very grave ). some main land use patterns i. e. woodland, garden, infield, abandon infield, shrub and grassplot are selected in those three sample sites. four aspects on soil fertility index of karst environment under different land use patterns in these three sample sites, are revealed in this paper, by using the field test, indoor measure and analysis, outdoor experiment and field investigation, and the knowledge and technique of soil, ecology, physics and chemistry etc. they are physical characteristic ( effective soil thickness, organic layer thickness, soil texture, water - stable aggregate and soil water etc. ), chemical fertility ( organism, omni - n, omni - p, omni - k, alkali - nitrogen, available p, available k and rapid available k etc. ), soil animalcule ( bacteria, fungi, actinomyces and their grosses ) and soil - seed - pool ( plant community diversity index ) in karst ecosystem
本研究以重慶市的南川金佛山(自然保護區) 、黔江武陵山(國家重點退耕還林示範縣,森林覆蓋率50以上)和北碚中梁山(遭人為破壞嚴重)典型巖溶區為對象,選擇了幾種重要的利用方式,包括林地、果園、耕地、棄耕地和灌草坡,採用野外巖溶生態調查和室內試驗測量分析相結合的方法,以不同
土地利用方式巖溶
土壤肥力為重點,對不同
土地利用方式
土壤肥力特徵進行量化分析,找出巖溶
土壤肥力差異的主要方面及其根本原因,論文主要從
土壤剖面物理退化指標(有效
土層厚度、有機質層厚度、質地、團聚體、水分含量等) ,化學肥力退化指標(有機質、全n 、全p 、全k 、堿解n 、速效p和速效k等) ,樣地
土壤微生物指標(
細菌、真菌、放線菌數量及總量)以及樣地
土壤種子庫植物群落多樣性等4個方面對重慶典型巖溶區的
土壤肥力特徵進行了較為詳
細的分析研究,為巖溶地區士壤資源的合理利用及結構的調控管理提供依據。
5. the osl dating of 37 samples of loess in weihe river basin by sar and multiple aliquot methods, indicates that sar protocol appears to be applicable to loess and appropriately correcting for sensitivity changes within the regenerated curves, however, there are major difference between the irsl and post - ir osl de determinations that suggest that sensitivity changes relating to either ( or both ) natural signals may not be correctly monitored
同時,用單片再生劑量法測小干3ha的黃
土細顆粒樣品, slsl 、 irsl和post irosl測的年代在誤差范圍內基本相同,接近預估年代;對於3ha ? 10ha的黃
土細顆粒樣品,一般post osl測的年代更接近預測值;對于大於10ha的樣品,一般irsl測的年代普遍太小,多數blsl年代也偏小,而p 。
In order to elaborate the app licability of osl to loess, especially single aliquot regenerative protocol ( sar ), involving stimulation of the same disc with an infra - red laser diode followed by blue leds to polymineralic fine - grains of loess, such explanations as light bleaching, preheat, anomalous fading, prior - ir exposure were investigated in this paper. for drawing adequate coarse grains from loess, quartz and feldspars, as well as loess, were etched by hydrofluoric acid and fluorosilicic acid. the sequence of ages of holocene loess in weihe rivier basin has been established by single - aliquot ( sar ) and multiple - aliquot using fine - grains and sar using coarse - grains
本文通過渭河流域全新世黃
土的光曬退實驗,地表黃
土樣品的d _ e值測定,
細顆粒單片的預熱、反常衰退、紅外暴露實驗,說明釋光測年在全新世黃
土中應用的可行性及單片再生劑量法( sar )在黃
土細顆粒中的適用性;為了從黃
土中分離出足夠的粗顆粒,進行了純石英和長石的氫氟酸( hf )和氟硅酸( h _ 2sif _ 6 )溶蝕實驗,黃
土粗顆粒石英溶蝕分離實驗;通過
細顆粒單片、多片的blsl 、 irsl和post - irosl ,熱釋光,及粗顆粒石英的blsl的年代測定,選擇適于全新世黃
土的釋光測年方法,並建立了渭河流域全新世黃
土的年代序列。
The nitrogen fixation in alpine meadow ecosystem is mainly accomplished by anaerobic nitrogen fixing bacteria. both ammonification and nitrification are the highest in 0 cm 10 cm soil depth
從不同植被類型
土壤的表層中各生理群菌數的平均值來看,反硝化
細菌的數量最高,嫌氣性自生固氮菌次之,再次為氨化菌和硝化菌。
1. ecological effects of long - term organophasphate pesticides contamination on soil microflora the long - term effects of organophosphate pesticides contamination on soil microflora were investigated in the present study. little difference in total counts of bacteria, actinomycetes and fungi was observed between the contaminated and the non - contaminated soil. compared with the control there were a slight decrease in total counts of free - living nitrogen - fixer and denitrifying bacteria and a significant increase in those of ammonifying and ammonia - oxidizing and nitrifying _ bacteria in the methylparathion contaminated soil
一、甲基對硫磷長期污染對
土壤微生物的生態學效應研究了有機磷農藥甲基對硫磷長期污染對
土壤微生物的影響,實驗表明:
土壤
細菌、放線菌、真菌總的數量影響不大;自生固氮菌和反硝化
細菌數量減少;氨化
細菌、亞硝化
細菌、硝化
細菌的數量在污染
土壤中卻有所增加;與對照
土壤相比,污染
土壤呼吸作用下降了29 . 93 ;氨化作用和硝化作用強度得到增強。
In view of the natural conditions in loess area of gansu, in the light of investigation conditions of seepage of built loess and weak rock highway tunnels in this area and classification of water gushing conditions for railway tunnels, and by engineering analogism, the classification of tunnel water gushing types suited the structure design of highway tunnel waterproof and drainage, and the three methods for checking and subdividing water gushing types are presented
摘要針對甘肅黃
土區的自然條件,依據該地區已建黃
土及軟巖公路隧道滲漏水調查情況和鐵路隨道涌水狀態分類,運用工程類比法提出適合該地區公路隧道防排水結構設計的隧道涌水類型劃分及對涌水類型校核與
細分的三種方法。
The swastika was a very popular symbol in ancient turkey, where it was frequently applied by the smiths of anatolia
納粹黨所用的十字記號在古代
土耳其是十分流行的符號,在
土耳其安納托利亞(亞洲西部半島小亞
細亞的舊稱)的鐵匠經常用它。
Asia minor ( a peninsula of western asia between the black sea and the mediterranean sea. it is generally coterminous with asian turkey and is usually considered synonymous with anatolia
小亞
細亞:黑海與地中海之間亞洲西部的一個半島,總體上與亞洲的
土耳其范圍相當,通常認為與安納托利亞同義
And understanding and studying the spectral features and variation rules of geo - targets in the experimental area, raising that it is the basis of geo - targets information collection with imaging spectrometer data to understand spectral features and variation rules of geo - targets, realizing that in a great extent spectral - integrated - form - based classification method can remove the phenomenon of " different spectrum with same objects " resulted from reflection ratio curve translation because of the angle change among sensor, targets and observation direction, and the average and variance images can be introduced to solve the problem of two kinds of geo - target with similar spectral forms and much different values of whole reflection ratio. it is suggested that " red edge " range bands of vegetation, which has close relationship with vegetation cover and biomass, is the main characteristic bands and important basis for careful vegetation classification and quantitative retrieval, and pixel - based derivative spectral analysis is very useful for removing the effects of soil background values and quantitatively retrieving vegetation biomass and cover. the remote sense quantitative retrieval model is developed for main appraisable factors of desertification monitoring assessment with imaging spectrometer data and then the applicability of model is analyzed
研究結果如下:首先針對荒漠化地區的地物特徵,對高光譜數據不同波段的數據質量、波段組合進行了評價,提出了適用於荒漠化監測的基本波段選擇集;初步了解和掌握了研究地區的地物光譜特性及變異規律,進一步明確了掌握地物光譜特徵和變異規律是用成像光譜儀數據提取地物信息的基礎;發現了基於光譜整體形狀的分類方法在很大程度上能夠消除由於傳感器、地物目標觀測方向之間的角度變化引起的反射率曲線整體平移的「同物異譜」現象,對于譜形相似而整體反射率的值相差較大的兩類地物,通過引入均值和方差圖像參與分類得到解決;研究還表明在植被「紅邊」范圍內的波段是進行荒漠化監測的主要特徵波段,這些波段與植被生物量和蓋度都有密切的關系,是開展精
細植被分類研究和植被定量反演的重要基礎;像元的導數光譜分析可以消除
土壤背景的影響,是進行植被生物量和蓋度定量反演的有力工具;建立了荒漠化監測主要評價因子的定量反演模型,並分析了模型的適用性。
The research overcomes the shortcomings of primers in common use, and breaks through the traditional astriction of absence of chemical bond between new and old concrete. both macrostructure and microstructure as well as bond mechanism was discussed and some further research advice was put forward
本研究克服了以往的界面劑僅能改善界面層宏觀或微
細觀結構的缺點,突破了新老混凝
土粘結層主要依靠范德華力提供界面粘結力而幾乎不存在化學鍵作用的缺點。
Edge of the granule image by video is the key of its image partition, the article tries to carry through a deeper research on image partition at the same time. granule is made up of savageness mater and industry material ( including of rock, sand, earth, atomy, steel, china, concrete, ink powder, magnetism powder, light fine and tiny powder used silicon, cell etc. )
顆粒是構成天然物質和工業材料(巖石、礦石、沙子、泥
土、塵埃、鋼鐵、陶瓷、水泥、墨粉、磁粉、光纖和料封裝材用高純硅微粉、
細胞等)的基本單元,顆粒尺寸(粒度)是顆粒的首要特徵和粉體材料的第一指標。
An auxin increases the growth in length of a plant cell, thus causing the curving of a stem, or roof, in phototropism and geotropism.
植物生長素能加快植物
細胞長勢,因此使莖彎曲向著陽光,或使根深扎入
土。
Depend on the comprehensive analysis and study of the structure, principle, and exterior characteristic of the motor, through the methods of system modeling and digital simulation analysis, two kind of control device that work for the low voltage ( lvdc ) and the high voltage ( hvdc ) in avigation are researched respectively. point to the control technique of close - loop speed stabilization at a limited adjustment speed range, we bring out the close - loop speed control method that using the rotor position sensor indirectly measure the speed of the motor
在全面分析了稀
土永磁無刷直流電動機的結構特點、工作原理、運行方式以及外部特性的基礎上,通過系統建模和數字模擬分析,分別針對航空低壓直流( lvdc )和高壓直流( hvdc )兩種電動機構用永磁無刷電動機,在小范圍轉速連續調節下的閉環穩速控制技術進行了詳
細理論研究,提出了利用轉子位置傳感器信號間接測量電機轉速進行電機轉速閉環穩速控制的策略。
Test method for capillary - moisture relationships for fine - textured soils by pressure - membrane apparatus
用壓力膜裝置對
細土壤的毛
細管與水分之間關系的試驗方法
Soils investigation and testing. determination of density of fine soils. cutting curb, mould and water immersion methods
土壤.調查與試驗.實驗細土密度測定.切樣法模具法浸水法