查询词典 arid

This research provides academic and instructive meanings for sustainable development of agriculture in semi-arid or arid irrigation region.

该研究对干旱半干旱区灌溉农业的可持续发展具有指导意义。

New sea 21 are varieties which can save water effeciently,so they have advantage in arid and semi-arid region.

新海21是节水型品种，能够较充分的利用有限的灌溉水，在干旱半干旱地区具有强大的优势。

North China ; Arid and semi-arid region ; Wind erosion.

中国北方；干旱半干旱地区；土壤风蚀

The control of wind erosion can maintain the fertility of farmland in arid and semi arid region.

可以采用保护性耕作技术防止农田沙漠化和提高作物产量。

To control the ground-water table on irrigated lands is vitally important in arid and semi-arid regions. In order to determine the standard of water table control, considerable attentions were paid to the "critical depth"(or "safe depth") of ground-water table. The salts accumulate in the top soil if the water table is not deeper than this depth. The conditions that the salts accumulate in any layer of the soil owing to the movement of soil moisture are:(1) the supplement of soil moisture from neighboring...

本文分析了地下水补給情况下土壤水分的形态和不同形态的水分在土壤中运行和蒸发的一些特点，论証了毛管水联系破裂含水率等土壤水分形态指标与土壤水分运动和土壤积盐状况的关系，探討了次生盐碱化发生的地下水临界条件，提出了地下水临界深度的确定方法，并且对現有的临界深度的确定方法进行了討论与比較。

In order to find the vegetable niche pattern in arid and semi-arid grassland region, the niche breadth and niche overlapping in Yanchi county of Ningxia in 2006 and 2007 are measured by means of Levins niche breadth and Pianka niche overlapping indexes in the enclosed grassland.

运用Levins生态宽度指数及Pianka生态位重叠指数，对宁夏盐池人工封育草原2006年和2007年植物生态位宽度及生态位重叠进行计量，以了解干旱半干旱区草原植物生态位格局。

Throug the study on irrigation quota and irrigation times for licorice root planted in arid sandy land of middle Ningxia, the result shows: by increasing irrigation frequency and irrigation fixed quantity properly, it can play a positive role in the conserving and increasing water-holding capacity in arid-belt sandy area.

摘要通过对宁夏中部干旱带沙地种植甘草的不同灌水定额及次数的研究，结果表明，适当的增加灌水次数和灌水定额对于保持和增加干旱带沙壤土持水率具有积极的作用，有利于植物的生长发育。

Species in Ceratoides are semi-shrub xerophytes distributed in arid and semi-arid area. They have great potentialities to ecological restoration and high value to being used as forage. However researches on their physiological characteristics related to drought adaptabilities were not sufficient, yet.

驼绒藜属植物为干旱、半干旱地区具有重要生态价值和饲用价值的旱生半灌木资源，对该属植物适应干旱生理特性的研究尚不充分，加深研究有助于提高对它们的利用效率和应用价值。

The study shows that the bulk subsoil can increase the rate of infiltration greatly and improve the physical structure of soil and decrease the amount of water distribution along the slope again. Further more, the growth of Caragana in area that was subsoiled increased 50.15% compare to contrast region. This paper suggests that the technology of bulk subsoil should be spread in arid region and semi-arid region as well as bess plateau.

结果表明，全方位深松技术可以明显的提高土壤入渗性能，改善土壤物理结构，减少水分沿坡面的二次分配，间接起到消减坡度的作用；经过全方位深松处理的柠条林地的土壤入渗效果也有明显的提高，改善了林地的水分条件，从而促进了柠条的生长，试验期间内对照区柠条最大生长量为12cm，平均增长量为5.17cm，深松区最大生长量也为12cm，但平均增长量8.28cm，比对照区要高50.15％。

After complete regional analogue, it is discovered that the palaeoclimate and palaeoenvironment in Tontso is entirely comparative and consistent with the synchronous lakewater retreating of Zhaduixiong spits in Zabuye Lake basin, with palaeoclimate changes recorded by pollen in adjacent Zhabuye Lake, with Holocene palaeoclimate environment indicated by drilling-hole in Bangong Co, with palaeoclimate significance traced by δ〓O value in Qinghai Lake and Siling Co, with pollen- and diatom-inferred climatic change in Longmu Co and Sumxi Co, and with the palaeoclimate framework during the 5〓 Level Arid Extension Period of Quaternary arid center of Western China.

对比研究发现，洞错的古气候环境，与同期相邻的扎布耶湖湖水退缩遗迹和花粉记录的古气候变化、班戈湖钻孔所揭示的全新世古气候环境、色林错δ〓O值所揭示的气候意义、龙木—松西错的孢粉和硅藻提供的古气候古环境信息以及第四纪西部干旱中心在第5级干旱扩张期中的古气候格局，它们的气候环境变化总体上均有可对比性和一致性。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。