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通过对白龙江沿岸垂直气候分析和花椒生长的实地调查以及栽植试验,将该地花椒的立体种植划分出四个层次。每个层次有其适宜的品种,以期每个层次栽植的花椒尽可能充分利用该层次的气候资源,获得较好的收益。 相似文献
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Manzhu Yu 《International journal of geographical information science》2017,31(5):939-961
Dust storms cause significant damage to health, property, and the environment worldwide every year. To help mitigate the damage, dust forecast models simulate and predict upcoming dust events, providing valuable information to scientists, decision makers, and the public. These simulation outputs are in four-dimensions (i.e., latitude, longitude, elevation, and time) and represent spatially heterogeneous dust storm features and their evolution over space and time. This research investigates and proposes an automatic multi-threshold, region-growing-based algorithm to identify critical dust storm features from 3D dust storm simulations. A multi-threshold scheme is defined for the identification of dust storm features with different dust concentrations. Based on the multi-thresholds, dust storm features are iteratively identified by developing a region-growing algorithm that splits a clustered dust storm feature into multiple sub-features. The proposed approach is compared with three commonly used methods in image processing and thunderstorm identification. The proposed approach outperforms the other three methods in sensitivity and quantitative/qualitative accuracy. This research approach may also be slightly adjusted to identify critical 3D features from simulation outputs for other severe weather and geographical phenomena. 相似文献
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Arps递减开发模型 总被引:22,自引:8,他引:14
本文在Arps递减产能预测模型的基础上提出了Arps递减开发模型,提出了开发速度,采出程度等开发指标的数学关系式,分析了参数Arps递减开发模型的影响,提出了开发初期Arps递减开发模型的确定方法,便于开发初期决策,制作了Arps递减开发模型的logVd-logRp图版,logVd-log(Dt)图版,logRp-log(Dt)图版,提出了开发中晚期Arps递减开发模型的判断方法,三点抛物线法和三 相似文献
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青藏高原高海拔地区柏树生长季节的探讨 总被引:6,自引:2,他引:6
树木生长的主要季节是在春、夏季,这里是对温带和亚热带地区植物生长一般规律的概述,但是对青藏高原海拔地区的柏树来说,这一规律有所不同,根据青藏高原不同海拔站点0.8m-1.6m和3.2m深地温、土壤含水量和日照的年内分布以及30cm冻结及解冻期的分析表明,高原上四季期间,秋季地温比春季高,土壤含水量比春季大,秋季不论是地温还是土壤含水量都比春季更有利于柏树的生长,青藏高原高海拔地区柏树生长的主要季节是夏、秋季,并非春、夏季。高原上高海拔地区树轮宽度与秋季温度与呈现的关系是该地区特有的现象,是年轮气候研究中的一种新特征。 相似文献
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根据2002年8月5日新疆昭苏盆地的雷达回波资料,对该雹云初始雷达回波的出现及演变过程的主要特征进行分析。 相似文献
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谢玉梅 《沙漠与绿洲气象(新疆气象)》2003,26(4):16-17
通过对吉木萨尔县南部山间盆地胡萝卜的种植与当地气象条件的分析,总结出胡萝卜适宜播期及水分和光照的需求特点。 相似文献
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