生态学报2024，Vol.44Issue(22)：10189-10199,11.DOI:10.20103/j.stxb.202310272335
高原鼠兔和刈割扰动对高寒草甸植物群落和土壤特征的影响
Effects of plateau pika and mowing disturbances on plant community and soil physical and chemical properties in alpine meadow
摘要
Abstract
Plant community and soil characteristics of alpine meadow could be obviously changed by both overgrazing and plateau pika outbreaks.This paper takes alpine meadow in Keqihetan,Henan Mongolian Autonomous County,Qinghai province as an example to study pika disturbance and mowing effects on plant community and soil physical and chemical properties in alpine meadow through a five-year controlled experiment.Mowing intensity and pika density are taken as two disturbance factors on vegetation community and soil in alpine meadow.The study results show that:(1)Mowing intensity,pika density and their interaction obviously interfere with vegetation height and coverage(P＜0.05).During the 5-year experimental period,the coverage of vegetation community decreased significantly.There are significant differences in vegetation coverage,aboveground biomass,importance values of the functional groups of Gramineae,Cyperaceae,Leguminosae and Forbs,Simpson index,Shannon-Wiener index,species evenness index and species richness index of vegetation communities among different years(P＜0.05).(2)Total nitrogen and phosphorus raise as time and mowing density increase,then they both decline.Duration,mowing intensity,and their interaction has significant effects on soil temperature(P＜0.05),and heavy mowing treatment increase soil temperature(P＜0.05)significantly.Pika density,duration,mowing intensity,and their interaction has significant effects on total nitrogen and phosphorus(P＜0.01).Plateau pika density increase brings a significant decrease in soil pH,and the pH decreases by 0.23 under high density treatment compared with no pika treatment.Meanwhile pika density has no significant effects on soil total nitrogen and phosphorus content.Therefore,moderate mowing is conducive to the restoration of the degraded alpine meadow vegetation and soil.In addition,identifying and setting the ecological thresholds of grazing intensity and plateau pika density in the degraded alpine meadow are critical to achieve sustainable and high-quality development of grassland animal husbandry.关键词
高寒草甸/刈割/高原鼠兔/干扰/植物群落/土壤特征Key words
alpine meadow/mowing/plateau pika/disturbance/plant community/soil properties引用本文复制引用
苏晓雪,李希来,孙华方,宋梓涵,李杰霞,张静..高原鼠兔和刈割扰动对高寒草甸植物群落和土壤特征的影响[J].生态学报,2024,44(22):10189-10199,11.基金项目
青海省科学技术厅科技援青合作专项项目(2023-QY-210) （2023-QY-210）
国家自然科学联合基金项目(U21A20191) （U21A20191）
青海大学青年教师科研基金项目(2021-QNY-12) （2021-QNY-12）
高等学校学科创新引智计划项目(D18013) （D18013）
