典型草原区不同年限弃耕地植物群落生物量权衡及其影响因素  

Plant Community Biomass Trade-off and Its Influencing Factors for Different Years of Abandoned Cropland in a Typical Steppe

作　　者：杨立山 李邵宇 郑佳华 何江峰 王文琼 乌云嘎 邢佳庆 赵萌莉 YANG Lishan;LI Shaoyu;ZHENG Jiahua;HE Jiangfeng;WANG Wenqiong;Wuyunga;XING Jiaqing;ZHAO Mengli(College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Hohhot 010011,China;Research Institute of Biotechnology,Inner Mongolia Academy of Agricultural&Animal Husbandry Sciences,Hohhot 010031,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特010011 [2]内蒙古自治区农牧业科学院生物技术研究所,内蒙古呼和浩特010031

出　　处：《中国草地学报》2024年第4期33-42,共10页Chinese Journal of Grassland

基　　金：内蒙古自治区科技重大专项(2021ZD0044);内蒙古自治区重点项目(2019ZD008);内蒙古自治区自然科学基金项目(2020ZD03)。

摘　　要：通过对植被地上、地下生物量的分析比较,可以反映出植物应对环境胁迫的不同适应策略。由于不合理利用和开垦天然草原导致大面积草地退化,因此我国启动了退耕还林还草生态修复工程,旨在恢复退化的草地生态系统。本研究以内蒙古典型草原区自然恢复的不同年限弃耕地为研究对象,通过对不同年限(5年、15年、20年)弃耕地及天然草地(对照)群落地上与地下生物量、物种组成及其相对生物量、植物丰富度指数和多样性指数以及土壤理化性质进行分析,探究典型草原区不同年限弃耕地群落生物量权衡(Trade-off)及其影响因素。结果表明:随着弃耕年限的增加,群落结构由一二年生植物占主导逐渐转化为多年生植物占主导,且植物物种多样性逐渐增加;不同年限弃耕地生物量均向地上权衡,随弃耕年限增加,向地上权衡幅度越来越小,天然草地则向地下权衡;土壤水分和一二年生植物的地上生物量是驱动生物量权衡的关键因素。Analysis of above-and belowground vegetation biomass can reveal plant adaptation strategies under environmental stress.Uncontrolled human activities have degraded vast area of grassland in China.The Grain to Green Program was implemented to restore these ecosystems.This study investigated above-and belowground biomass,community species composition and the relative biomass,plant richness and diversity indexes,and soil physical and chemical properties across three abandoned croplands with different recovery times(5,15 and 20 years)and a reference natural grassland site.The aim was to explore plant community tradeoff and its influencing factors during the restoration of abandoned cropland.The results showed that abandoned croplands exhibited a shift in community structure from annuals-and biennials-dominated to perennial-dominated assemblages over time,with increasing plant species diversity.Interestingly,aboveground biomass dominated total biomass across all abandoned cropland ages,though it increased first and decreased with increasing recovery time.In contrast,the natural grassland displayed a belowground allocation pattern.Soil moisture and biomass of annual-and biennial plants emerged as the key drivers of biomass trade-off.

关 键 词：典型草原 生物量权衡 群落结构 土壤理化性质 

分 类 号：S812[农业科学—草业科学]