EFFECT OF SOIL SURFACE-TOPOGRAPHY AND LITTER COVER ON THE GERMINATION, SURVIVAL, AND GROWTH OF MUSK THISTLE (CARDUUS-NUTANS)
EFFECT OF SOIL SURFACE-TOPOGRAPHY AND LITTER COVER ON THE GERMINATION, SURVIVAL, AND GROWTH OF MUSK THISTLE (CARDUUS-NUTANS)
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DOI：
10.2307/2443821
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发表时间：
1987-03-01
影响因子：
3
通讯作者：
LEE, JM
中科院分区：
文献类型：
--
作者：
HAMRICK, JL;LEE, JM
在麝香蓟 (Carduus mutans L.) 的自然种群中，在秋季和春季的几个月内会发芽。为了更好地了解影响这种发芽模式的物理环境机制，建立了一个温室实验，该实验由十个处理组成，其中土壤表面地形以及凋落物覆盖的数量和稠度发生变化。不同处理之间的发芽率、死亡率和个体生长率存在显着差异。在提供蒸发减少的微生境的处理中，发芽、存活和生长达到最佳水平。裂缝或适度不规则表面形貌的处理提供了最佳条件。少量的枯枝落叶覆盖有利于建立和生长，但厚厚的枯枝落叶层会阻止种子到达土壤表面并减少发芽和建立。这些结果与已知的麝香蓟在自然种群中的发芽生态学一致。
In natural populations of musk thistle (Carduus mutans L.) germination occurs over several months in the fall and spring. To better understand the physical environmental mechanisms that influence this pattern of germination, a greenhouse experiment was established consisting of ten treatments in which soil surface topography and the amount and consistency of litter cover was varied. Significant differences occurred among the treatments for germination percentage, levels of mortality and individual growth rates. Optimum levels of germination, survival and growth occurred in treatments that provided microhabitats with reduced evaporation. Treatments with cracks or moderately irregular surface topographies provided the best conditions. A light covering of litter benefited establishment and growth but thick layers of litter prevented seeds from reaching the soil surfce and reduced germination and establishment. These results were consistent with what is known about the germination ecology of musk thistle in natural populations.