共查询到19条相似文献,搜索用时 93 毫秒
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抗旱造林粉在民勤干旱沙区梭梭造林上的应用 总被引:2,自引:0,他引:2
2010年通过抗旱造林粉在民勤干旱沙区沙丘"双眉式"麦草方格沙障上进行梭梭裸根苗浸根法造林应用试验,结果表明:抗旱造林粉在民勤干旱沙区能提高造林成活率,可以提高植物体自身抗性,控制水分丧失,维持植物体水分平衡,延缓植物生命周期,抑制林木生长状态,降低造林成本,促进梭梭生长发育.因此,抗旱造林粉在干旱、半干旱地区应用已成... 相似文献
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民勤沙区气候概况及其特点 总被引:1,自引:0,他引:1
民勤沙区气候干燥云量少,晴天多、光照丰富、有利于植物光合作用,辐射强,可作为能源。冬季漫长约半年,夏季短促炎热,昼夜温差大,在植物生长活跃期积温较高,平均可达3279.6℃。干燥少雨,为全国最干旱地区之一。植物生长期短,且在生长期内常有霜冻(旱、晚霜)危害,风多沙大,春季对植物苗期危害严重。 相似文献
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为探讨抗旱造林粉、BGA激活剂、ABT生根粉和浸根造林等抗旱技术对梭梭造林的影响,在民勤干旱沙区开展了有关应用技术研究.结果表明:(1)不同抗旱造林技术处理对造林林分保水作用存在一定的差异,BGA土壤激活剂使梭梭造林林分(100 cm)土壤含水率提高53.24%;(2)抗旱造林技术对梭梭的生长差异显著,BGA土壤激活剂处理的梭梭植株高相对对照处理增长5.32 cm,枝长增长2.81 cm; (3)抗旱造林技术对于提高梭梭造林成活率有促进作用.ABT生根粉、抗旱造林粉2种处理对于对照处理成活率分别提高8个百分点和6个百分点. 相似文献
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绿色沙产业在民勤沙区的探索与实践 总被引:2,自引:0,他引:2
针对民勤沙区在沙漠化防治中如何加快沙产业发展,实现可持续发展的治理效益,根据钱学森沙产业理论,提出“绿色沙产业”的新模式,并在防沙治沙中探索其实施途径。通过创建产业基地,进行开发实践,认为该区具有发展绿色沙产业的有利条件,今后可以科学合理地开发该产业。 相似文献
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民勤沙漠区气候特征的分析 总被引:9,自引:2,他引:7
民勤县位于甘肃河西走廊东北部荒漠区 ,地处巴丹吉林和腾格里2大沙漠的相壤地带 ,风沙危害严重。民勤沙漠区的气候特征是 :光热资源丰富 ,气温较差大 ,冬春季气温表现偏暖趋势 ;大风频繁 ,1年当中 ,大风主要分布在 3~ 5月份 ,在一昼夜之间主要分布在下午至傍晚 ;风向以西北风为主 ,≥ 6m/s的风速在 1 6个风向中 ,NW、WNW、W、NNW、N5个风向占 97 6 % ;降水稀少 ,且集中分布在 6~ 9月份。大面积沙漠裸露 ,是造成春季气温高 ,气压低 ,大风沙尘暴频繁的主要原因之一。节水、保护水资源和建造沙漠植被是改善当地生态环境的关键措施。 相似文献
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黔中山地2种喀斯特森林的林冠截留总量均值为76.36mm、灌草层截留总量均值为435.75mm、净地表径流总量均值为11.06mm、90cm壤中流量均值为10.76mm、蒸发及其它量均值为509.75mm,其相对值为7.32%、41.76%、1.06%、1.03%、48.84%,与其它森林类型对降雨量的影响模式明显不同。不同喀斯特森林类型对随降雨流动的Ca^2+,Mg^2+,K^+,Na^+,Cl^-,NO3^-,NH4^+,SO4^2-有稀释或积聚作用,主要受森林树种组成和结构以及土壤类型的影响,这为利用喀斯特森林改善水质、净化空气提供了依据。除马尾松树干径流中所测离子浓度均有积聚作用外,杨树、枫香、樟和冬青对部分离子有积聚作用、对另一部分离子有稀释作用,因树种而异。相对于林外降雨,林内降雨中离子浓度增大的有Ca^2+、Mg^2+、K^+、NH4^+、SO4^2-、NO3^-、降低的有Na^+,地表径流中所测离子浓度均增大,相应集水区溪流中离子浓度增大的有Ca^2+、Mg^2+、Na^+、NO3^-、降低的有K^+、NH4^+、SO4^2-。黑色石灰土和黄色石灰土对90cm壤中流的离子浓度有不同效应,二者均具有集聚作用的是Ca^2+、Mg^2+、SO4^2-、稀释作用的是NO3^-。Cl^-在喀斯特森林降雨中的规律性较差。 相似文献
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George N.Zaimes Petros A.Tsioras Chrysovalantis Kiosses Mustafa Tufekcioglu Sergiy Zibtsev Ilya Trombitsky Razvan Uratu Luiza Gevorgyan 《林业研究》2020,31(1):257-268
Protected areas are necessary for the conservation and enhancement of biodiversity.Wildfires are major threats to forests and other natural areas,because they may cause irreversible damages.The aim of this study was to analyze the perspective of experts(N=284),from six countries of the Black Sea,on the current status and problems of protected areas and wildfires.Understanding their points of view could enhance future management on these issues in the region.Data collection was carried out for 9 months,using a web-based questionnaire.Wildfires were perceived as a serious problem in Turkey,Armenia and Greece but as a substantially less serious problem in Romania,Ukraine and Moldova.In Greece,Armenia,and especially Ukraine,the current designated protected areas are considered sufficient to maintain biodiversity,while in Romania,Turkey,and especially Moldova,more areas should be designated as protected.A major need in all countries(except for Turkey)is the increased use of information and communication technologies for both wildfire suppression and protected area management.Experts were divided on whether wildfire suppression and management of protected areas are interconnected.However,there is growing awareness of the adverse impacts of climate change in protected areas and the frequency of wildfires in the future.The most frequently suggested measures to alleviate these impacts were:changes in forest management and increasing public awareness for wildfire suppression,along with changes in forest management and increased staff training to enhance protected area conservation. 相似文献
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Gong Zhang Guang-Ming Zeng Guo-He Huang Yi-Min Jiang Jia-Mei Yao Chun-Yan Du Ru Jiang Chang Zhang 《Journal of Forest Research》2006,11(6):389-396
The effects of dry deposition, canopy leaching, precipitation ion concentration, and precipitation H+ concentration on net throughfall flux (NTF, throughfall minus bulk precipitation) were evaluated on a seasonal basis by using
a multiple regression analysis approach based on an observation period of 4 years in Shaoshan subtropical mixed evergreen
forest, south-central China. Regression analysis results indicated that the estimated canopy exchange flux was the dominant
factor regulating the NTF and the calculated dry deposition was a minor term. The seasonal dry deposition of base cations
accounted for 15%–43% of the NTF. The NTF analysis showed that K+, Ca2+, Mg2+, Na+, and weak acids in throughfall were derived from foliar leaching and the canopy uptakes of H+, NH4
+, and NO3
− were from precipitation. The retention rate of proton (H+ and NH4
+) in the canopy was close to the canopy leaching rate of base cations when corrected for weak acids because weak acid-induced
canopy leaching did not exchange with protons, which suggested that the canopy leaching processes neutralized acid precipitation
in Shaoshan forest. 相似文献
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茶陵县紫色页岩荒漠区植被恢复初探 总被引:1,自引:0,他引:1
茶陵县紫色页岩分布广泛,但部分紫色页岩裸露,山地荒芜,植被稀少,覆盖率低.本文介绍了茶陵县紫色页岩分布情况,分析了紫色页岩荒漠区林地土壤肥力状况及植被特征,并重点探讨了紫色页岩荒漠区植被恢复措施,建议政府增加财政投入,建立合理的营林措施,拓展林业发展空间,恢复森林植被,优化生态环境,发展农林牧业生产,增加农民收入. 相似文献
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民勤荒漠植被的初步研究 总被引:8,自引:0,他引:8
民勤荒漠植被种类贫乏,结构简单,受地下水位下降的影响,形成了以唐古特白刺为建群种的顶极群落,其它植物种群均在衰退;降水量在现实状况下以木本植物的影响很小,对秋季短生植物影响较大,本区植被的演替趋向强旱生化。 相似文献