Plant-soil feedback of the invasive Sorghum halepense on Hainan island, China

Sorghum halepense is a perennial invasive weed causing great harm worldwide, including various regions on Hainan island. In this study, using two approaches, we examined plant-soil feedback of different S. halepense populations. In the first, rhizosphere soil of S. halepense from the field was either sterilized or not to study the role of soil biota on S. halepense growth. In the second, we first let S. halepense plants condition the soil, and then regrow plants on these conditioned soil to study the role of overall changes in soil properties in plant-soil feedback. Sterilization increased the growth of S. halepense, indicating that soil biota inhibited the growth of S. halepense. Soil biota from some populations inhibited the growth of S. halepense more than that from others. In most cases, the relative response of a S. halepense population when associated with its own soil vs. when associated with other soils was similar to the relative response of other populations across the same s...

假高粱（Sorghum halepense）是一种多年生入侵杂草，在全球范围内造成严重危害，包括海南岛的多个区域。本研究采用两种方法，探究不同假高粱种群的植物-土壤反馈（plant-soil feedback）效应。第一种方法中，将田间采集的假高粱根际土壤进行灭菌处理或不处理，以研究土壤生物群（soil biota）对假高粱生长的作用。第二种方法中，先让假高粱植株对土壤进行驯化，随后在这些驯化后的土壤上重新种植植株，以研究土壤性质整体变化在植物-土壤反馈中的作用。灭菌处理促进了假高粱的生长，表明土壤生物群抑制假高粱生长。部分种群来源的土壤生物群对假高粱生长的抑制作用强于其他种群来源的土壤生物群。在大多数情况下，假高粱种群在其自身土壤中与在其他土壤中生长时的相对响应，与其他种群在相同的s...中的相对响应相似。