查询词典 arid area

On the basis of pollen analysis of surface sample in North China, polynomial function analysis method was applied to establish pollen climate response surface of Pinus, Betula, Quercus, Artemisia, Chenopodiaceae, Compositae, Picea, Ephedra, Gramineae in North China, therefore an easy and applicable method for reconstructing palaeoclimate and palaeoenvironment with data of fossil pollen was founded; Multi-analysis method was applied to analyse the principal elements of surface sample pollen in central Inner Mongolia Steppe, the assemblages of surface sample pollen in steppe area and its relationship with vegetation type were discussed with helps from spore-pollen analysis of a peat section in Chasuqi, Inner Mongolia and 〓C chronometer, fossil pollen data were obtained with high resolution on the peat section in Chasuqi. Vegetation succession and environmental changes since Holocene at resolution of 70 years were primarily reconstructed in south Mount Daqingshan and Plain Tumete. The changes in the area were copmared with those in the neighbouring areas during the same period. It was found that Holocene environmental change had undergone the following stages: cold-arid, temperate-wet, warm-wet, temperate-arid and cold-arid, and the climatical optimum period occurred in 5000-4100 aB.

本文在对中国北方表土花粉研究的基础上，采用多项式函数回归方法建造了中国北方松属、桦属、栎属、蒿属、藜科、菊科、云杉属、麻黄属、禾本科等的花粉——气候趋势面，从而为利用化石花粉资料直接恢复古气候、古环境提供了一种方便易行的方法；采用多元分析方法对内蒙古中部草原区表土花粉进行了主成分分析，探讨了草原区表土花粉组合的规律及与植被类型的关系；本文还应用孢粉分析方法，结合〓C测年技术，通过内蒙古中部察素齐泥炭剖面高分辨率的化石花粉数据，初步恢复了大青山山地南部及土默特平原地区分辨率为70年的全新世以来植被演替和环境变迁的状况，并与邻近地区的全新世古气候、古环境进行了对比研究，研究发现，本区域全新世古环境的变迁序列基本上可以与周围地区及华北地区进行对比，其环境变迁经历了凉干～温湿～暖湿～温干～凉干的变化，且气候最适宜期出现在5000～4100aB.P。

Five items of principles was discussed in the paper. Based on these principles, taking Turpan oasis as one case, the index system of appraising on SARD of arid area is bui...

本文以新疆吐鲁番绿洲为例，构建干旱区绿洲SARD评价指标体系，评价结果是吐鲁番地区农业与农村经济发展均为弱可持续状态，并指出其制约因素和潜力。

Sabina wlgaris Ant. Var. vulgaris suitable to planting in arid area is a good evergreen creeper tree with the characters of cold resistance, drought resistance, poor soil resistance and shade bearing. This kind of tree can replace the lawn in city and town requiring high consuption of water.

天山圆柏是抗寒、抗旱、耐土壤府薄、耐荫的优良常绿匍匐类针叶树，在干旱区阳坡和前山带生态建设中可广泛应用，同时是城镇园林绿化中替代高耗水草坪的极佳树种。

Based on a rather long temporal series of remote sensing data, employing RS and GIS as its tool and FVC that is of rather high sensitivity over the coverage of vegetation in arid area as its monitoring index of desertification, the dissertation analyzes the features of the dynamitic variation of desertification in Xinjiang over the years by using the slop variation to reflect the features of temporal-spatial distributing and the changes of areas of the desertification in Xinjiang.

以较长时间序列的遥感数据为基础，以RS和GIS为工具，选择了在干旱区对植被覆盖度上有较好敏感性的FVC的斜率作为荒漠化监测指标，利用1982~2000年期间新疆FVC斜率变化来反演新疆土地荒漠化的时空分布、面积变化，分析新疆荒漠化多年来动态变化特征； 3。

E＇jina basin is one of the most arid area in the west of Inner Mongolia, and the ecologic environment is very weak, and which has been weakened by human activities.

文章摘要：地下微生境位置的确定对于干旱区植被生态系统的恢复具有重要意义，但目前尚没有准确、简单可行的确定方法。

This paper puts forward an optimal design method for designing standards of irrigation pivot engineering in the inland arid area on theb asis of the system analysis theory.

本文根据系统分析的理论，提出一种内陆干旱区灌溉枢纽工程设计标准优化设计方法。

Planted forests can deplete deep soil water, forming an obstacle to sustainable land use in the semi-arid area of Loess Plateau. The purpose of this study was to examine effects of grazing and cropping on replenishment of deep soil water where forest plantations had depleted soil moisture at depths of 2～9.9 m. We compared soil moisture on plantation plots with that on plots where plantations were replaced by crops, grazed grassland, and ungrazed grassland seperately.

为了研究黄土丘陵半干旱区人工林迹地土壤水分恢复情况，该文以正在生长的人工林土壤水分含量为人工林迹地土壤水分恢复的起点，并分别以持续农地和持续放牧荒坡的土壤含水量为林后农地和草地土壤水分恢复的上限，对位于黄土丘陵半干旱区绥德县境内的人工林迹地土壤水分恢复情况进行了研究。

In field and pot experiment to research spatial coupling of nitrogen fertilizer and irrigating water in semi-arid area in North China under unsufficient irrigation.

主要结论如下：（1）在干旱半干旱地区，进行夏玉米生产，大幅度节约灌溉水用量（全生育期灌水量从2250 m3/ha 降低到1200 m3/ha、1125 m3/ha、600 m3/ha），对作物产量影响较小，产量下降幅度在10%-15%之间。

Results provide scientific basis for promoting development of water-saving farming system and the optimal allocation of water resources in arid area of Xinjiang Region of China.

该研究为推动新疆干旱区节水农业的发展和水资源的优化配置提供了科学依据。

It is difficult to study directly ore-forming hydrogeochemistry of sandstone type uranium ore in arid area, therefore, author have found out the laws of solution, precipitation and migration of uranium minerals in the groundwater using the mechanism of water rock interaction and uranium, thorium and their isotopic ratios, and have probed into the relation between uranium ore-forming hydrogeochemistry condition, hydrogeochemistry environment and uranium ore-body fixed position by studying the epigenetic hydrogeochemistry trackways in the rock.

由于干旱地区对砂岩型铀矿成矿水文地球化学研究困难，难以取水样直接研究。因而在研究方法上，作者运用水岩相互作用原理和铀钍及其同位素比值，查明地下水中铀矿物溶解、沉淀和迁移规律；通过研究岩石中留下的水文地球化学形迹，探讨铀成矿水文地球化学条件、水文地球化学环境及其与铀矿体定位的关系。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。