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水稻田
相关语句
  paddy field
    So, understanding the spatial and temporal variability of soil nutrients in paddy field is the foundation of precision agriculture management.
    因此,了解该区水稻田土壤养分的空间和时间变异是精确农业管理的基础。
短句来源
    While many studies have been carried out at a small scale, relatively few have been done at large scale, especially on paddy field. Geostatistics and GIS were used in this study to analysize the spatial and temporal variability of soil nutrients in paddy field and their mechanism under three different scales of HJH Plain (1:250000), Pinghu county (1:50000) and Tongxin test plot area (1:2000), meanwhile, the regionalized management was brought forward in this study.
    本研究应用地统计学和GIS技术相结合的方法,以南方水稻田为研究对象,选择1:250000杭嘉湖平原、1:50000平湖市、1:2000同心村试验小区三个不同尺度研究区域,分析了水稻田土壤养分的时空变异及其机理,并进行不同尺度管理分区模式探讨。 主要研究结果如下:
短句来源
    The main results obtained are summarized as follows:1. Spatio-temporal variability of soil nutrients in paddy field in HJH PlainThe contents of soil organic matter (SOM), total nitrogen (TN) and available phosphorus (AP) in HJH Plain increased from 1982 to 2001, whereas, that of AK decreased dramatically.
    1.杭嘉湖平原水稻田土壤养分时空变异 2001年杭嘉湖平原水稻田土壤有机质、全氮、有效磷含量均比1982年第二次土壤普查时有所提高,而速效钾含量有大幅下降。
短句来源
    The results showed that the differencing image PCA method has higher detection accuracy compared with the conventional method--post-classification change detection and the overall accuracy of the change detection reaches 0.89 and the Kappa coefficient is 0.82. The research result also showed that the landscape changed about 22% in the Liaohe River Delta area during 1984-2000. The main change is the reduction of the reed area, the increase of the paddy field and the city area.
    研究结果表明:(1) 与传统的检测法—分类后比较法相比,差分主成分分析法具有较高的检测精度,总检测精度为0.89,Kappa指数为0.82; (2) 在1984~2000年的16年间,辽河三角洲地区有近22%的景观发生了变化,主要包括芦苇湿地的减少、水稻田的增加以及城镇用地的增加。
短句来源
  “水稻田”译为未确定词的双语例句
    (6) Inoculation of Scenedesnius obliquus in flooded-water at early periodsafter fertilizer application could significantly fix the NH4桸 and NO~桸 inflooded-water.
    (7)在水稻施肥初期田面水中接种斜生栅藻后,田面水中NH_4-N和NO_3-N浓度均有显著降低,表明斜生栅藻在水稻田氮素管理中具有一定的应用价值。
短句来源
    In present, much of the research done has concentrated on quantifying and understanding the spatial components of soil nutrients and crop yields variability;
    尽管目前国内外对土壤养分的变异已有了比较深入的研究,但大多集中在对土壤养分的空间变异上,对其时间变异的研究甚少,而且目前的研究主要集中在旱地的土壤养分变异上,对水稻田的土壤养分的变异研究较少。
短句来源
  相似匹配句对
    So, understanding the spatial and temporal variability of soil nutrients in paddy field is the foundation of precision agriculture management.
    因此,了解该区稻田土壤养分的空间和时间变异是精确农业管理的基础。
短句来源
    Under conditions of fixed place trail for a long time, the change of water and salt in rice field of humid land was studied with five treatments.
    在长期定位定点试验条件下 ,设置 5个处理研究易涝地稻田盐的变化规律。
短句来源
    A Study on Relationship between Soil Water and Groundwater
    土壤和地下关系研究
短句来源
    The 21st is the century of water.
    21世纪被称为的世纪。
短句来源
    Research advances on methane emission from rice paddy
    稻田甲烷排放的研究进展
短句来源
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  paddy field
Off-line experiments have been conducted with IAP94 land surface model on different surface types (cropland, forest and paddy field) in different seasons (spring, summer and autumn) over the Huaihe River basin.
      
Pronounced concentration-dissipation law of total function score value occurs in paddy field units, with three ranges, i.e., 79~68.5, 68.5~59 and 59~51.
      
Paddy field quality is divided into three gradations, and the scales are 18 220.9 ha, 5410.6 ha and 2890.9 ha.
      
A 21-day laboratory incubation experiment was conducted to investigate the impact of pesticides (insecticide, herbicide, fungicide) on paddy field soil health under controlled moisture (flooded soil) and temperature (25°C) environment.
      
N2O emission from paddy field under different rice planting modes
      
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According to the investigation from 1992 1994,7 order, 18 families, 130 species of water birds were recorded in Tianjin wetland.Among these water birds, 9 species belong to residents; 35 species of summer migrants. Among them 13 species belong to Palearctic, constituting about 35.14% of the total. 14 species from Oriental region,constituting about 10.81% of the total; 20 species with wide distribution, constituting about 54.04% of the total. ...

According to the investigation from 1992 1994,7 order, 18 families, 130 species of water birds were recorded in Tianjin wetland.Among these water birds, 9 species belong to residents; 35 species of summer migrants. Among them 13 species belong to Palearctic, constituting about 35.14% of the total. 14 species from Oriental region,constituting about 10.81% of the total; 20 species with wide distribution, constituting about 54.04% of the total. As a whole, the water bird faunal composition of Tianjin wetland is rich in the characteristics of Palearctic and wide distribution. The seasonal changes in number of the water bird is greatly significant, being number peak in Summer and Autumn.There are 9 species resident birds, constituting about 4.69% of the total from 192 species; in addition, there are 124 species passing migrants,constituting about 64.58% of the total; 35 summer migrants,constituting about 18.23% of the total; and 24 winter migrants,constituting about 12.50% of the total. The evaluation of the nature reserve of the water birds were studied by using to analyse them and the results showed that 21 species of the natural protected birds were found in Tianjin wetland,of which 7 species(5.38%) were grade I and 14 species (10.77%) of grade Ⅱ,constituting about 58.33% of the total. There are 82 species (63.08%) belonging to ornamental birds, in addition, there are 60 species (46.16%) belonging to hunting and beneficial birds.

天津地区湿地水禽共计130种,兼属7目,18科。在留鸟和夏侯鸟中,属于古北界的鸟类有13种,占35.14%;东洋界的种类有14种,占10.81%;广布种有20种,占54.04%。栖息池塘沼泽的种类占33.73%;河道漫滩水库区的种类占28.21%;滨海滩涂湖沼区为22.99%;水稻田和水浇地为5.27%。属于国家Ⅰ级保护的鸟类有7种,Ⅱ级有14种,占国家保护的游涉禽总数的58.33%。82种为观赏鸟类,占天津地区水禽的63.08%。多数水禽种群数量低,应加保护。

This paper describes a method of the detection for the landscape change by satellite remotely sensed data. In order to improve the accuracy of detection for the landscape change, we presented the differencing image PCA method to improve the Principal Component Analysis (PCA) and the band difference of images method using the multi-temporal remotely sensed data of TM (Thematic Mapper). And the Liaohe River Delta of China was selected as a case to validate this method. The results showed that the differencing...

This paper describes a method of the detection for the landscape change by satellite remotely sensed data. In order to improve the accuracy of detection for the landscape change, we presented the differencing image PCA method to improve the Principal Component Analysis (PCA) and the band difference of images method using the multi-temporal remotely sensed data of TM (Thematic Mapper). And the Liaohe River Delta of China was selected as a case to validate this method. The results showed that the differencing image PCA method has higher detection accuracy compared with the conventional method--post-classification change detection and the overall accuracy of the change detection reaches 0.89 and the Kappa coefficient is 0.82. The research result also showed that the landscape changed about 22% in the Liaohe River Delta area during 1984-2000. The main change is the reduction of the reed area, the increase of the paddy field and the city area.

差分主成分分析法是应用遥感数据检测景观变化的一种新方法。为了提高检测精度,我们利用TM卫星遥感数据,改进了主成分分析法和图像差值法,提出了差分主成分分析法。并以辽河三角洲地区为例,对该方法进行了验证。研究结果表明:(1) 与传统的检测法—分类后比较法相比,差分主成分分析法具有较高的检测精度,总检测精度为0.89,Kappa指数为0.82;(2) 在1984~2000年的16年间,辽河三角洲地区有近22%的景观发生了变化,主要包括芦苇湿地的减少、水稻田的增加以及城镇用地的增加。

Records from buried paleosol offer important clues to understand global and local change of natural environment in geological history. Little anthropologic paleosol which may contain valuable information on ancient human activities and their effect on environment have been found. Previous studies suggested that two layers of ancient paddy soils existed in Holocene strata at the lower Changjiang River delta region in China,but little evidence of soil chemical and physical data has been offered up to now. Twelve...

Records from buried paleosol offer important clues to understand global and local change of natural environment in geological history. Little anthropologic paleosol which may contain valuable information on ancient human activities and their effect on environment have been found. Previous studies suggested that two layers of ancient paddy soils existed in Holocene strata at the lower Changjiang River delta region in China,but little evidence of soil chemical and physical data has been offered up to now. Twelve continuous samples from the profile P-01 in Chuodun archeological site,Kunshan City,Jiangsu Province,China,were collected and analyzed. Total nitrogen (TN) was determined by using Kjeldahl method. Total organic carbon (TOC),clay mineral compositions,magnetic susceptibility and particle sizes were analyzed by using element analyzer,X-ray diffraction (XRD),magnetic susceptibility meter,and laser-particle-size analyzer,respectively. XRD data showed that the distribution of kaolinite contents and kaolinite to illite (K/I) ratios had two peaks at the depth from 200cm (bottom) to 100cm and from 57cm to 0 (surface layer). Such a distribution of clay minerals was in consonance with the distribution of TOC and TN as well as rice phytoliths,suggesting that there were two soil-forming periods recorded in the P-01 profile. The lower one was the formation of paleosol layer,and the latter was the formation of modern paddy soil. However,the TOC,TN and rice phytolith data did not support the viewpoint of the existence of a paleosol layer at the depth of 57cm to 42cm. The decrease of clay contents and magnetic susceptibility in the depth from 200cm to 130cm implied that the paleosol was formed in a waterlogged condition. Previous research on modern paddy soil suggests that a fraction of soil clay might be drained out from surface soil with drainage water when growing paddy rice under traditional cultivation. Thereby,the decrease of clay contents in depth from 200cm to 130cm might be resulted from drainage in the Middle Holocene. Evidence from archaeology,palynology as well as phytolith implied that the paleosol is associated with ancient paddy soil. The wave-like distribution pattern of magnetic susceptibility in the depth from 130cm to 42cm might respond to historical climate changes,although the involved processes were not clear yet. Further study on paleosol formation and climate changes is thus needed.

前人研究认为,在长江下游地区绰墩农业遗址的全新世地层中存在2个古水稻土层,但到目前为止尚缺乏土壤化学和物理学方面的证据。为了寻找土壤学证据,在江苏省昆山市绰墩遗址P-01垂直剖面中连续采集了12个样品,分别测定了全氮(TN)含量、总有机碳(TOC)含量、粒度组成、质量磁化率以及粘土矿物组成。结果显示,从剖面底部(200cm)到100cm处和从57cm处到现代土壤表层,TOC,TN,TOC/TN比值、高岭石含量以及高岭石/伊利石(K/I)比值两次出现逐渐升高的趋势,而且它们的曲线形态基本一致。这些特点有可能说明P-01剖面中包含着两次成壤过程第1次形成了古土壤层(160~100cm),第2次形成了现代水稻土(57cm~现代土壤表层)。但TOC和TN以及水稻植硅石资料不支持在深度57~42cm段存在古土壤的观点。从200cm到130cm处,磁化率和粘粒含量有逐渐降低的趋势,说明此处具有长期淹水的特征。现代水稻土的研究表明,水稻田排水过程中可能使部分粘粒被带走流失。因此,粘粒含量从200cm到130cm处逐渐降低的趋势可能与中全新世的人工排水有关。研究资料与考古学、孢粉学和植硅体资料共同说明,该古土壤层...

前人研究认为,在长江下游地区绰墩农业遗址的全新世地层中存在2个古水稻土层,但到目前为止尚缺乏土壤化学和物理学方面的证据。为了寻找土壤学证据,在江苏省昆山市绰墩遗址P-01垂直剖面中连续采集了12个样品,分别测定了全氮(TN)含量、总有机碳(TOC)含量、粒度组成、质量磁化率以及粘土矿物组成。结果显示,从剖面底部(200cm)到100cm处和从57cm处到现代土壤表层,TOC,TN,TOC/TN比值、高岭石含量以及高岭石/伊利石(K/I)比值两次出现逐渐升高的趋势,而且它们的曲线形态基本一致。这些特点有可能说明P-01剖面中包含着两次成壤过程第1次形成了古土壤层(160~100cm),第2次形成了现代水稻土(57cm~现代土壤表层)。但TOC和TN以及水稻植硅石资料不支持在深度57~42cm段存在古土壤的观点。从200cm到130cm处,磁化率和粘粒含量有逐渐降低的趋势,说明此处具有长期淹水的特征。现代水稻土的研究表明,水稻田排水过程中可能使部分粘粒被带走流失。因此,粘粒含量从200cm到130cm处逐渐降低的趋势可能与中全新世的人工排水有关。研究资料与考古学、孢粉学和植硅体资料共同说明,该古土壤层(160~100cm)很可能是古水稻土。古水稻土的确认将为农业考古和古环境变化研究提供有利的条件。

 
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