伊洛河是黄河中游小浪底水库下最大的支流,是黄河流域重要的水源涵养区之一。研究该流域不同土地利用类型下伊洛河的生态状况,对于黄河流域的生态保护和高质量发展至关重要。本研究调查了土地利用类型对伊洛河流域大型无脊椎动物群落和功能结构的影响,并引入了土地利用健康指数(LUI)的概念。在调查期间,共收集到1894种大型无脊椎动物,并鉴定了143个物种,属于4门,7命令,22个家庭,75个家庭。结果表明,LUI对大型无脊椎动物群落结构的影响最为显著,与基板类型,植物干重,总磷,浊度,和附着的藻类生物量在影响大型无脊椎动物群落中也起着重要作用。物种丰富,Shannon-Wiener指数,Margalef丰富度指数与采样点的LUI呈非线性正相关,随着LUI的增强而增加,并最终达到一个平台。功能丰富度与LUI呈线性正相关,随着它的增强而增加,而功能均匀性和功能发散性与LUI呈非线性相关。随着LUI的增强,功能均匀性最初增加,然后下降,而功能分歧随LUI增强而减小。该研究可为不同土地利用情景下的河流生态管理提供科学参考。
Land use types have a significant impact on river ecosystems. The Yiluo River is the largest tributary below Xiaolangdi Reservoir in the middle reaches of the Yellow River, and is one of the important water conservation areas in the Yellow River Basin. Studying the ecological status of the Yiluo River under varied land use types in this basin is crucial for both ecological protection and the high-quality development of the Yellow River Basin. This study investigated the impacts of land use types on the macroinvertebrate community and functional structure in the Yiluo River Basin and introduced the concept of the land use health index (LUI). During the survey period, a total of 11,894 macroinvertebrates were collected, and 143 species were identified, belonging to 4 phyla, 7 orders, 22 families, and 75 families. The results showed that LUI had the most significant impact on macroinvertebrate community structure, with substrate type, dry plant weight, total phosphorus, turbidity, and attached algae biomass also playing significant roles in affecting macroinvertebrate communities. The species richness, the Shannon-Wiener index, and the Margalef richness index exhibited a nonlinear positive correlation with LUI of the sampling site, increasing as LUI enhancing and eventually reaching a plateau. Functional richness showed a linear and positive correlation with LUI, increasing with its enhancement, while functional evenness and functional divergence exhibited a nonlinear correlation with LUI. Functional evenness initially increased and then decreased with the enhancement of LUI, while functional divergence decreased with LUI enhancement. This study can provide a scientific reference for river ecological management under various land use scenarios.The Yiluo River is the largest tributary below Xiaolangdi Reservoir in the middle reaches of the Yellow River, and is one of the important water conservation areas in the Yellow River Basin. Studying the ecological status of the Yiluo River under varied land use types in this basin is crucial for both ecological protection and the high-quality development of the Yellow River Basin. This study investigated the impacts of land use types on the macroinvertebrate community and functional structure in the Yiluo River Basin and introduced the concept of the land use health index (LUI). During the survey period, a total of 11,894 macroinvertebrates were collected, and 143 species were identified, belonging to 4 phyla, 7 orders, 22 families, and 75 families. The results showed that LUI had the most significant impact on macroinvertebrate community structure, with substrate type, dry plant weight, total phosphorus, turbidity, and attached algae biomass also playing significant roles in affecting macroinvertebrate communities. The species richness, the Shannon-Wiener index, and the Margalef richness index exhibited a nonlinear positive correlation with LUI of the sampling site, increasing as LUI enhancing and eventually reaching a plateau. Functional richness showed a linear and positive correlation with LUI, increasing with its enhancement, while functional evenness and functional divergence exhibited a nonlinear correlation with LUI. Functional evenness initially increased and then decreased with the enhancement of LUI, while functional divergence decreased with LUI enhancement. This study can provide a scientific reference for river ecological management under various land use scenarios.