羊草草地4种群落活根生物量与土壤理化性质的关系

摘要

Leymus chinensis grassland in Western Jilin Province as the study of natural samples,the choice often grazing in restoration succession process of the four kinds of plant communities as the research object,underground biomass,soil properties and their mutual relations between the two,the results show that 4 communities underground biomass of live roots with depth and the decreasing trend,and the total living root biomnss of L chinensis community ( shorthand com. ) ＞ L -Inula com. ＞ L -Puccinellia com. ＞ degraded com.; soil basicity, pH, soluble salts, electrical conductivity and water content in the four communities have shown with basic with the increase of soil depth trend, with the live root biomass mostly negative; and soil organic matter,hydrolysable N, available K,available P showed more soil depth with the downward trend,with the underground bio-consistent with the trend of volume,and with the live root biomass mostly positive.%以吉林省西部天然羊草草地作为研究样地,选择放牧恢复演替过程中常见的4种植物群落为研究对象,对其地下生物量、土壤理化性质及其二者间相互关系进行研究,结果表明:4个群落地下活根生物量均有随着土层加深而逐渐减少的趋势,且总活根生物量为羊草群落>羊草-旋复花群落>羊草-星星草群落>过度放牧退化群落;土壤的碱化度、pH、可溶盐、电导率和含水量在4个群落中基本都表现出随着土层深度的增加而增加的趋势,与活根生物量多呈负相关;而土壤有机质、水解氮、速效钾及速效磷含量多表现出随着土层加深而下降的趋势,与地下生物量的变化趋势相一致,与活根生物量多呈正相关.