Reaches of your Yangtze River are a very crucial ecological barrier in China, but the ecological rewards of large-scale Cupressus funebris Endl.plantations are low. This study investigated 12 plantations of different compositions and densities, including two densities of Cinnamomum septentrionale Hand.-Mazz. (Cs), Alnus cremastogyne Burk. (Ac), and Toona sinensis (A. Juss.) Roem. (Ts), and mixed plantations of Cs Ac (CA), Ts Cs (TC), Ts Ac (TA), and Ac Ts Cs (ATC) along with the cutting-blank (CB), and, at the identical time, the unreconstructed pure C. funebris (Cf) forest was set as the handle. We aimed to discover the influence mechanism of upper tree composition and density on shrub diversity, as well as the connection between shrub diversity and niche. Our investigation results are as follows: (1) Among all of the patterns, the TA, CA, and TC patterns will be the most conducive to improving the diversity of shrubs. The composition and density of various trees have a fantastic influence around the diversity of shrubs. (2) Niche is closely associated for the diversity of shrubs. In the patterns of low niche overlap between dominant shrubs, the diversity of shrubs is higher. These final results contribute to a deeper understanding with the connection amongst the diversity of overstory and shrubs, and reveals the connection among niche and diversity. Key phrases: Cupressus funebris; low-function plantation; mixed forest; plant diversity; niche; reconstructionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.1. Introduction The upkeep of biodiversity is a important problem in present forest management, and may help human societies to assure the long-term persistence of forest LY266097 Neuronal Signaling ecosystems, services, and resources [1,2]. Understory shrubs, as backup plants for the regeneration, development, and succession of forest ecosystems, will be the earliest woody plants within the approach of succession and are able to drive the look and succession on the canopy [1]. The diversity of shrubs is definitely an important element of forest biodiversity, specially in plantations, exactly where is crucial for the development of communities and also the upkeep of diversity [2,3]. Additionally, shrubs keep the soil top quality on the stand, and play an important function in forest improvement, the conversion of cropland to forests, and so on. Having said that, preceding study around the diversity of plants has mostly focused on the diversity of trees, the diversity of grasses, or the trees and shrubs as a whole, not solely focusing on the study on the diversity of shrubs.Copyright: 2021 by the authors. Licensee MDPI, Basel, Switzerland. This short article is an open access article distributed under the terms and situations on the Creative Commons Attribution (CC BY) license (licenses/by/ 4.0/).Forests 2021, 12, 1492. ten.3390/fmdpi/journal/forestsForests 2021, 12,2 ofInvestigation from the diversity differences and also the niche qualities of dominant shrub Ametantrone Cell Cycle/DNA Damage species in different forest stands is of great importance to revealing the position and the function of each and every shrub species and predicting the shrub diversity inside the future community along with the interrelationship amongst species. The diversity of a shrub is closely connected to its niche. Additionally, the niche theory has made an awesome contribution towards the formation and upkeep on the diversity of plants. For instance, the basis of your biodiversityenvironmental heterogeneity theory is the fact that modifications inside the atmosphere w.