Missouri River invasive plant species sample locations and cover values 2002-2012

The Land Capability Potential Index (LCPI) is a hydrogeomorphic model of potential flow-return interval and soil drainage classes developed as a decision support tool for the restoration and management of floodplain habitat on the Lower Missouri River. Because the LCPI captures abiotic variables known to affect the distribution of plant species, it may be useful in predicting where invasive species are likely to occur and become abundant and as a framework for applying management actions to control their spread. The frequencies with which 5 non-native and 1 native invasive species occurred and exceeded 15 percent cover were examined in relation to LCPI classes using existing data collected during multiple studies between 2002 and 2012. Results indicate that the distributions of garlic mustard, Japanese hops, Johnson grass, reed canary grass, sweet clover, and velvetleaf are significantly related to soil drainage, flow-return interval, or both. Although there is no evidence to support a generalized model of susceptibility to invasion, LCPI classes do indicate the relative susceptibility of sites to invasion by individual species. Results suggest that the LCPI model can inform management strategies to control those species and provide a framework for assessing management efficacy.

土地承载力潜力指数（Land Capability Potential Index，LCPI）是一种用于表征潜在径流回归间隔与土壤排水等级的水文地貌模型，其开发目的为密苏里河下游漫滩生境的修复与管理提供决策支持工具。由于LCPI涵盖了已知会影响植物物种分布的非生物变量，该指数或可用于预测外来入侵物种易发生并大量滋生的区域，同时可作为制定管理措施以遏制其扩散的分析框架。本研究基于2002至2012年间多项研究收集的现有数据，针对5种非本土入侵物种与1种本土入侵物种的出现频次及其盖度超过15%的发生情况，结合LCPI等级开展了相关性分析。结果显示，大蒜芥（garlic mustard）、日本葎草（Japanese hops）、约翰逊草（Johnson grass）、虉草（reed canary grass）、草木犀（sweet clover）与苘麻（velvetleaf）的分布与土壤排水等级、径流回归间隔，或二者均存在显著关联。尽管尚无证据支持可建立通用的入侵易感性模型，但LCPI等级确可指示不同站点针对单个入侵物种的相对易感性。研究结果表明，LCPI模型可为上述入侵物种的管控策略制定提供科学依据，并可作为评估管理措施实施成效的分析框架。