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。
But in the later, the limo policy finally given the czarist government the opportunity to be aggressed, ended in the evil consequence of losing the territory
但在清朝後期,對邊疆少
數民族的羈縻政策最終給沙皇俄國的侵略以可乘之機,換來了喪失疆
土的惡果。
Organic acids are normal constituents of most agricultural soils.
有機酸是大多
數農業
土壤中通常的組分。
In influencing the inside factors of peasant household ' s decision, have householder ' s schooling, population, workforce ' s quantity and land area, householder ' s schooling and land area exert a great influence on peasant household ' s decision ; the external factors of influencing peasant household ' s decision have natural environment conditions, agrotechnical to popularize cost and benefit, policy, market, community and neighbourhood relation, popularize service system
在影響農戶決策的內部因素中,有戶主文化程度、人口和勞動力
數量及
土地面積,戶主文化程度和
土地面積對農戶決策的影響較大;影響農戶決策的外部因素有自然環境條件、農技推廣成本與效益、政策、市場、社區及鄰里關系、推廣服務體系。
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 。
This graph, produced using preliminary altimetry data from cassini ' s radar instrument, shows relative surface heights on titan
這是用卡西尼號上的雷達探測出的初步測高
數據製成的圖表,顯示出
土衛六上地表的相對高度。
The studied factors respectively are : length of soil nailing, insert deepness of piles, friction force of soil nailing interface, declination angle of soil nailing, horizontal spacing of soil nailing, rows of soil nailing, unit weight of soil, friction angle, unit cohesion, overload of slope, diameter of soil nailing
這11個因素分別為:
土釘(錨管)長度、
土釘直徑、
土釘界面摩擦力、
土釘下傾角、
土釘水平間距、
土釘排
數、
土體重度、內摩擦角、粘聚力、坡頂超載、板樁插入深度。
Two basic types of clay minerals are present in most soils.
大多
數土壤中出現了兩類主要的粘
土礦物。
The experimental data were presented as mean 1 standard deviation ( x ? )
結果以均
數土標準差kh )表示。
Variables were expressed as mean + standard deviation ( x + s ) and self - antitheses t tests were done to evaluate differences, p value of less 0. 05 was required for significance
各組
數據應用均
數土標準差表示( x s ) ,應用自身對照比較的t檢驗進行統計學處理, p 0 . 05為差異顯著。
Most soils in pakistan are derived from water - transported ( alluvium ) or wind - blown ( loess ) material, yet some have been formed by in - situ weathering of rocks
巴基斯坦大多
數土壤由水成(沖積)或風成(黃
土)母質發育而來,也有一些是當地母巖風化而成。
This technique is mainly involved two steps : 1 ) vegetation effects correction : we used ndvi ( normalized difference vegetation index ) derived from tm and avhrr measurements for spatial and temporal variations of vegetation covers at different scales
但由於電磁波與地表相互作用的復雜性,雷達後向散射系
數除受地表介電常
數(
土壤水分)影響外,還受到地表粗糙度、
土壤類型、植被覆蓋以及雷達入射角、頻率、極化等多種因素的影響。
Furthermore, it was shown that load - displacement of pile groups and load distribution on pile top were affected by properties of soil and stiffness ratio of piles to soil, and by length, diameter, spacing, and number of piles
在此基礎上,分析了剛性承臺條件下超大群樁基礎的荷載位移曲線變化規律以及樁頂荷載分佈規律受樁
土剛度比、樁長、樁徑、樁距、樁
數、
土性等因素的影響規律。
Research results show that foundation pit slope soil structure destroy characteristic is subgrade shear strain destroy, namely, it is gradually destroy. lateral displacement of retaining and protecting piles has relations with embed depth, load grade and strength index parameter. soil displacement and timbering pile displacement are in harmony with deformation
研究結果表明,基坑邊坡
土體具有地基整體剪切變形破壞的特點,系漸進破壞的過程;支護樁側向變形是樁嵌固深度、荷載大小、
土體強度參
數變量的函
數;
土體的位移和支護樁的位移滿足變形協調條件。
However, most soils have a high potential for large shifts of ammonium to ammonia
然而,大多
數土壤都很容易使大量的銨離子轉化成氨。
Based on matlab system, a multi - layer back propagation neural network model was developed, in which the effects of the depth from surface to the tunnel axis, tunnel diameter, groundwater level, as well as the elastic modulus, shear strength, side pressure coefficient and unit weight of soil and the space between excavated wall and lining on the ground subsidence were considered
採用matlab系統開發了一個多層反向傳播神經網路模型,考慮了隧道的深度、隧道的直徑、地下水位、土的彈性模量、土的剪切強度、土的側壓系數、土的重度和開挖間隙對地表沉降的影響。