Effects of Rock Climbing on Cliff Goldenrod (Solidago sciaphila Steele) in Northwest Illinois
Effects of Rock Climbing on Cliff Goldenrod (Solidago sciaphila Steele) in Northwest Illinois
复制标题
攀岩对伊利诺伊州西北部悬崖黄花（一枝黄花）的影响
DOI：
10.2307/2426387
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发表时间：
1995
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
- 一枝黄花是一种地方性的一枝黄花，仅限于中西部上部和附近的无漂流区的白云石或砂岩悬崖。一项对伊利诺斯州西北部的544个基株进行的人口统计学研究表明，悬崖上的位置是影响生长的最重要因素。百分之七十的植物生长在悬崖顶部的三米范围内，这一面积仅占悬崖面的18%。在上悬崖区，攀岩显着降低了一枝黄花密度。积极攀登的悬崖有几个基在上3米，平均3.2/M2，而未攀登的悬崖和悬崖没有攀登2年，分别支持14.2/M2和12.0/ i2。断面积/平方米和开花分株产量/平方米显着降低，花序长度非显着降低，目前攀登悬崖，由于较低的基株密度。在较低的悬崖区（距离顶部>3米），无论攀爬强度如何，所有悬崖上的基株密度都很低（0.2-2.1/ m2）。在攀缘的悬崖上，50%以上的开花分株被折断，显著高于未攀缘的悬崖上的15%。破碎的开花分株产生了22%的总花序长度在目前攀登的悬崖（相比之下，<5%的未攀登和以前攀登的悬崖），导致总花序生产统计相似，但低于，未攀登和以前攀登的悬崖。两年后停止攀登，一枝黄花在上区的先前攀登的悬崖同样高的密度，断面积，分株生产和花序生产上unclimbed悬崖。攀援似乎扭曲的人口结构，有利于生存的大型开花基因和抑制生存较小的nonflowering基因。这种差异基本上消失在悬崖unclimbed为2年。为了保护一枝黄花，有必要保护整个悬崖面，最优先考虑上部3 m。
-Solidago sciaphila is an endemic goldenrod, restricted to dolomite or sandstone cliffs in and near the driftless region of the upper Midwest. A demographic study of 544 genets on currently climbed, previously climbed and unclimbed dolomitic cliffs in NW Illinois indicated that position on the cliff face was the most significant factor affecting growth. Seventy percent of all plants grew within 3 m of the cliff top, an area that comprised only 18% of the cliff face. Within the upper cliff zone, rock climbing significantly reduced Solidago density. Cliffs that were actively climbed had few genets in the upper 3 m, averaging 3.2/M2, while unclimbed cliffs and cliffs not climbed for 2 yr supported 14.2/M2 and 12.0/ i2, respectively. Basal area/M2 and flowering ramet production/m2 were significantly lower, and inflorescence length nonsignificantly lower, on currently climbed cliffs, due to the lower genet density. In the lower cliff zone (>3 m from the top) genet density was low (0.2-2.1/ m2) on all cliffs, regardless of climbing intensity. On climbed cliffs > 50% of flowering ramets were broken, significantly more than the 15% broken on unclimbed cliffs. Broken flowering ramets produced 22% of total inflorescence length on the currently climbed cliffs (compared to <5% on unclimbed and previously climbed cliffs), resulting in total inflorescence production statistically similar to, but lower than, that on unclimbed and previously climbed cliffs. Two years after cessation of climbing, Solidago in the upper zone of the previously climbed cliffs had similarly high density, basal area, ramet production and inflorescence production as on unclimbed cliffs. Climbing appeared to skew the population structure, favoring survival of large flowering genets and inhibiting survival of smaller nonflowering genets. This difference largely disappeared on cliffs unclimbed for 2 yr. To protect Solidago sciaphila, it is necessary to protect the entire cliff face, with highest priority given to the upper 3 m.