Floristic quality indices for biotic assessment of depressional marsh condition in Florida
Floristic quality indices for biotic assessment of depressional marsh condition in Florida
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DOI：
10.1890/02-5378
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发表时间：
2004-06-01
影响因子：
5
通讯作者：
Lane, CR
中科院分区：
文献类型：
--
作者：
Cohen, MJ;Carstenn, S;Lane, CR
湿地生态状况评价需要定量的生物指标来衡量人为损害。我们对 75 个孤立的、洼地草本湿地系统实施了修改后的植物区系质量评估指数 (FQAI) 协议，探索 FQAI 标准方法的改进。采样过程中遇到的物种 (n = 397) 由 10 名独立工作的植物专家分配了保守系数 (CC)。为每个湿地系统计算了邻近场地缓冲区（最多 100 m）土地利用强度的定量汇总指标，称为景观开发强度 (LDI) 指数，以量化预期的人为损害。 LDI 和湿地群落平均 CC 分数之间的关联很强，并且有条件地独立于生态区。其他社区摘要指标（包括丰富度加权的 FQAI）与 LDI 的关联性较弱。我们倒置 LDI 来计算强度系数 (IC)，该系数量化了每个物种耐受的观察到的缓冲液发育强度。 IC 分数与 CC 分数在物种基础上显着相关，并且在位点平均值基础上密切相关。人们对出于监管目的进行植物区系质量评估的兴趣日益浓厚，这为将专家意见和物种特定干扰耐受性的地面观察正式联系起来提供了机会。
Evaluation of wetland ecological condition requires quantitative biological indices for measuring anthropogenic impairment. We implemented a modified floristic quality assessment index (FQAI) protocol for 75 isolated, depressional herbaceous wetland systems, exploring refinements of FQAI standard methods. Species encountered during sampling (n = 397) were assigned coefficients of conservatism (CC) by ten expert botanists working independently. A quantitative summary metric of adjacent site buffer (up to 100 m) land use intensity, called the landscape development intensity (LDI) index, was calculated for each wetland system to quantify expected anthropogenic impairment. The association between LDI and wetland community mean CC scores was strong and conditionally independent of ecoregion. Weaker associations with LDI were observed for other community summary metrics, including richness-weighted FQAI. We inverted LDI to compute an intensity coefficient (IC), which quantifies observed buffer development intensity tolerated by each species. IC scores were significantly associated with CC scores on a species basis and strongly associated on a site mean basis. Growing interest in floristic quality assessment for regulatory purposes provides opportunities for formally linking expert opinion and ground observations of species-specific disturbance tolerance.