| 民勤荒漠植被特征及其适应特征初步研究 |
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| 引用本文： | 杨兆义.民勤荒漠植被特征及其适应特征初步研究[J].防护林科技,2006(3):33-36. |
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| 作者姓名： | 杨兆义 |
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| 作者单位： | 甘肃省建筑工程总公司第四中学,甘肃,兰州,730000 |
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| 摘 要： | 民勤荒漠区植物种类稀少,自然植被以沙旱生灌木、半灌木和草本为主,属于典型的荒漠植被类型;从植物区系分布看,以地中海-中亚分布成分为主,北温带分布成分、亚洲温带分布成分、中亚成分及旧大陆温带分布成分种类稀少;优势种、建群种单一;植被不稳定,植被盖度受当年降水情况影响较大;即使在降水条件好的年份,在人为活动影响少的地段的植被盖度最大只有45%;植物萌动,展叶开始时间较迟;植物的物候期受当年降水量和降水季节影响不大;多数植物靠种子繁殖,自然繁殖受当年降水量、降水季节和土壤条件影响大;种子自然繁殖一般出现在低缓的流动、半固定沙丘和平沙地上;流动和半固定沙丘(沙地)植被受年度降水量大小的波动性大。
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| 关 键 词： | 荒漠植被 分布特征 自然繁殖 物候期 民勤 |
| 文章编号： | 1005-5215（2006）03-0033-04 |
| 收稿时间： | 2005-09-05 |
| 修稿时间： | 2005-09-05 |
Preliminary Study on Characteristics of Desert Vegetation in Minqin County |
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| YANG Zhao-yi.Preliminary Study on Characteristics of Desert Vegetation in Minqin County[J].Protection Forest Science and Technology,2006(3):33-36. |
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| Authors: | YANG Zhao-yi |
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| Institution: | Gansu Province Construction Engineering Firm Fourth High School, Lanzhou 730000, Gansu, China |
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| Abstract: | Shrub,semi-shrub and herb in psammophyte and xerad are dominant in the natural vegetation in Minqin desert area.It is typical of desert vegetation.According to the distribution of flora,the composition of the flora of the Mediterranean sea-central Asia is predominant;the composition of the flora of the north temperate zone,the Asian temperate zone,the central Asia,and the temperate zone in the old continent is less;the species making up the vegetation are limited with mono dominant and edificator species.The vegetation is unstable and it's covering in a year highly determined by precipitation in the year.However in the rainfall rich year the vegetation covering in the area where there are fewer disturbances from human may reach 45% or so.The plants sprout and leaf earlier.The precipitation and raining season have less effect on the phenology.Most of the plants reproduce by seeds.Their natural regeneration is highly influenced by rainfall,raining season and the condition of the soil.The regeneration by seeds usually takes place on shifting,semi-fixed dunes and flat sandy areas.The vegetation covering on the shifting,semi-fixed dunes is in relation to the annual rainfall. |
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| Keywords: | desert vegetation distribution characteristics natural regeneration phenology Minqi |
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