摘要
通过对沙坡头人工固沙植被区不同类型的生物结皮进行不同程度的人工干扰,对生长在结皮上的两种草本植物雾冰藜和小画眉草的繁衍和生长进行了研究。结果表明:与未受干扰的对照相比,轻度干扰下3种类型生物结皮上雾冰藜的密度、冠幅、高度、根系长度和生物量都有显著增加,重度干扰下3种类型结皮上的雾冰藜生长有所增加,密度则显著下降;轻度干扰下苔藓和藻类苔藓混生结皮上的小画眉草生长有所增加,密度基本未变,藻类结皮上小画眉草密度和生长都无显著变化。重度干扰下苔藓和藻类苔藓混生结皮上的小画眉草生长有所增加,密度和生长量下降。同时分析讨论了两种维管束植物在生物结皮受到干扰时不同表现的机理。
Biological soil crusts exist in a wide variety of environments around the world.It serves as an important biological factor contributing to the sand fixation.Disturbances are also widely existing phenomena in any ecosystem,especially in arid and semiarid areas in our country,where under the pressure of human population,disturbances such as grazing and trampling have important influences on the ecosystem.Our objective was to learn the influences of different disturbances for biological soil crusts on vascular plants by experiments of imitation disturbances set in artificial fixed-dunes area in Shapotou region.The results showed： the density,average crown,height,root length,and biomass of Bassia dasyphylla grown on three types of biological soil crusts increased significantly with the crusts being slightly disturbed.When the crusts were severely disturbed,the growth of Bassia dasyphylla increased moderately,while the density decreased.Under the circumstance of slight disturbance,the density and growth of Eragrostis minor grown on the moss crusts as well as on the the algae-moss crusts increased slightly and its density did not change significantly.Eragrostis minor grown on the algae crusts did not vary considerably in growth and density.With severe disturbance,Eragrostis minor grown on the moss crusts as well as on the algae-moss crusts increased slightly in height and decreased greatly in density and biomass.The growth and density of Eragrostis minor grown on the algae crusts did not change significantly.The mechanism of the different results of these two herbal plants was analyzed after the crusts were disturbed.
出处
《水土保持研究》
CSCD
北大核心
2011年第5期87-90,95,共5页
Research of Soil and Water Conservation
基金
国家自然科学基金(40971031)
关键词
人工固沙植被
生物结皮
干扰
维管束植物
artificial fixed-dunes vegetation
biological soil crust
disturbance
vascular plant
作者简介
富远年（1959-），男，甘肃民勤县人，高级工程师。主要从事干旱区植被恢复和重建研究。E-mailwwljzx@126．com
