1) air drought
空气干旱
1.
Berolinensis was the most tolerant to air drought be-cause its stomata were insensitive to low air humidity,allowing for a keeping relatively high stom-atal conductance for gas exchange.
‘popularis35-44’)1年生插条苗进行盆栽试验,发现它们对空气和土壤干旱的耐性存在很大差异,其中Berolinensis对空气干旱的耐性最强,对土壤水湿的耐性最弱;Italica和Robusta对土壤干旱反应敏感,当田间持水量(FFC)降至40%时,净光合速率(Pn)已显著降低,严重干旱(30%FFC)时,苗木下部1/4叶片脱落,同时,上部叶面积生长受到很大抑制;Berolinensis和Popularis虽在干旱初期Pn下降显著,但7d后Pn不同程度回升,并且受旱期间叶面积生长受到的影响较小,即显示出对土壤干旱的耐性,因此,杨树无性系对土壤干旱耐性依次为Popularis>Beroiinensis>Robusta>Italica。
2) arid climate
干旱气候
1.
The Sain Us gold deposit is a typical auriferous sulfide quartz vein deposit in the arid grassland climatic zone of Inner Mongolia The oxidation zone has been controlled by the arid climate since the beginning of Holocene.
研究表明:自全新世以来该氧化带一直处于干旱气候控制之下;金的表生演化除具有颗粒增大、形态复杂、品位变富和成色增高外,金、银出现双峰富集且基本处同一深度;这与潮湿气候区金、银以“单峰”富集及“上金下银”规律形成鲜明对比。
2.
By analyzing the low of arid climate and its stress effects on farming in the mountainous areas of south Ningxia, the paper indicates that drought disasters are the main reason for the low and unstable agroproductivity, and the farming techniques being suitable to the climatic condition should be investigated and improved so as to lay a foundation to the sustainable development of agriculture.
通过分析宁夏南部山区干旱气候规律及其对农业的胁迫效应,指出干旱灾害是宁南农业生产力水平低而不稳的重要原因;加强与气候条件相适应的农业技术的研究和改进,是宁南农业持续稳定发展的重要基础。
3) meteorological drought
气象干旱
1.
Study on integrated meteorological drought index based on PDSI and SPI
基于PDSI和SPI的综合气象干旱指数研究
2.
The index used in describing hydrologic drought and meteorological drought are presented in this paper.
概述了气象干旱和水文干旱的指标种类,并对各指标进行初步评述,同时详细介绍了几种常用干旱指数的计算方法。
3.
Results show that overexploitation of groundwater triggered by meteorological drought further aggravated hydrological drought,the groundwater funnel and land subsidence disasters.
通过对廊坊市地下水漏斗演化过程与逐年降水的相关分析,揭示了地下水位下降漏斗的气象干旱响应模式,即气象干旱促使人类过度开采地下水资源,从而进一步加剧水文干旱、地下水位下降漏斗及地面沉降灾害。
4) drought climate
干旱气候
1.
Assessment on the influence of drought climate on main crop yield in Southeast of Gansu;
干旱气候对陇东南主要农作物产量影响的评估
2.
Analysis of Drought Climate in Lintao During Late Spring and Early Summer;
临洮县春末夏初干旱气候分析
5) climatic drought
气候干旱
1.
Risk assessment of climatic drought for winter wheat in Henan;
河南省冬小麦气候干旱风险评估
6) dry climate
干旱气候
1.
Analysis on effects of evolution of dry climate in Tianshui in 20th century on agriculture and countermeasures;
20世纪天水干旱气候演变对农业影响及对策分析
2.
After careful examination on the coarse deposits, in comparison with the modern and ancient alluvial fan analogues, these discrete red coarse deposits are proposed as the remains of different parts of one Paleogene piedmont alluvial fan, sourced by the carbonate hinterland under a dry climate.
该冲积扇为一典型的古近纪早期干旱气候条件下、母岩区为陡峻碳酸盐岩山体的古山麓冲积扇。
3.
Based on the causer analysis,the Paleogene alluvial fan is proposed as piedmont alluvial fan sourced by the carbonate hinterland under a dry climate.
在成因分析的基础上,认为该冲积扇为一典型的古近纪早期干旱气候条件下,母岩区为陡峻碳酸盐岩山体的古山麓冲积扇。
补充资料:干旱
干旱
drought damage
台湾省资料暂缺御,又未能及时解决维持社会正常生产和人类生活所必需的最低限度的水资源而造成的一种缺水灾祸。不同研究领域和不同研究对象的干旱有以下不同涵义:①气象干旱。在一个时期内,水分供应持续低于气候上所期望的水分供给。干旱强度取决于水分亏缺量及其持续时间。②农业干旱。作物缺水不能满足正常生长所需要的水分。干旱强度取决于土壤不同深度含水量、作物种类、生长状况和生长期。根据作物受害的成因不同,可将农业干旱分为土壤干旱、大气干旱和生理干旱。土干旱土地龟裂ganhan干早(曲旧ught dall网罗)一个地区某段持续时间里,按照常规年景安排的人类活动受到缺水威胁所出现的旱象。早宙训具指出现比较严重旱象时,由于社会抗旱力不高或无力抵壤于旱是由于土壤缺水,植物根系吸收不到足够的水分补偿蒸腾消耗所造成的危害;大气干旱是空气十分干燥,并伴有一定风力,土壤虽不一定缺水,但由于蒸腾强烈,使植株供水不足而形成危害;生理干旱是不良的土壤环境条件使作物生理过程发生障碍,导致植株水分平衡失调而造成危害。③水文干早。地表水减少和地下水位明显降低或者河流流量显著减小而出现的旱象。④社会经济干旱。缺水对该地区的经济产生明显的不利影响。 干旱是水分亏缺缓慢累积的结果,属渐进性灾害。大气环流异常造成的干早,其影响面积往往较大。根据干早影响时间长短和特征,可分为长期干旱、季节性干早、临时干旱和隐蔽干旱。干旱是中国主要气象灾害之一,尤其对农业影响最大。根据历史记载,中国从公元前2肠年到1男9年的2155年中,发生早灾达1056次,平均两年一次。防御干早是中国防灾减灾的重要工作,根据干旱规律,调整农业结构、兴修水利,合理灌溉,平整土地,深耕改土,选育耐早品种,提高抗早能力、抑制蒸发和蒸腾、减少水分消耗、蓄水保墒和营造农田防护林等措施对于防早抗旱有明显效果。(安顺清)
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参考词条