Structure of cliff vegetation on exposed cliffs and the effect of rock climbing
Structure of cliff vegetation on exposed cliffs and the effect of rock climbing
复制标题
裸露悬崖峭壁植被结构及攀岩效应
DOI：
10.1139/b96-077
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
V. Nuzzo
中科院分区：
文献类型：
--
作者：
V. Nuzzo
对美国伊利诺斯州西北部无漂流区裸露白云岩悬崖的植被结构进行了定量分析，选取了5个悬崖的186个样方。所有峭壁植被稀疏，在海拔6 m处共记录到41种植物，其中地衣植物14种，维管植物27种。所有悬崖的平均盖度为16.03%，其中地衣占10.23%，维管植被占5.80%。70%的植被生长在离悬崖3米的范围内。线性回归表明，植被盖度和密度均随断裂带的增加而增加，而随离崖顶距离的增加而减少。TWINSPAN将这些样方分成五组，每组的地衣和维管覆盖不同，第六组由裸露的岩石组成。群落的空间分布受岩石破裂、坡度、风化和可能水分有效性的小尺度差异的影响，发生在小尺度上。爬升使地衣盖度和种类密度显著降低50%。
Vegetational structure of exposed dolomitic cliffs in the driftless region of northwest Illinois was quantified from 186 quadrats on five cliffs. All cliffs were sparsely vegetated, with a total of 41 species (14 lichen and 27 vascular) recorded in the upper 6 m. On all cliffs, cover averaged 16.03%, with lichen contributing 10.23% cover and vascular vegetation 5.80% cover. Seventy percent of all vegetation grew within 3 m of the cliff top. Linear regression indicated that both cover and density of vascular, but not lichen, flora increased with increased fracturing and decreased with distance from the cliff top. TWINSPAN arranged the quadrats into five groups that differed in lichen and vascular cover and a sixth group that consisted of bare rock. Spatial distribution of the community groups occurred at a small scale, influenced by small scale differences in rock fracturing, slope, weathering, and likely moisture availability. Climbing significantly reduced lichen cover and lichen species density by 50%, ...