施肥时间对退化草甸草原地下芽库及其与地上植被关系的影响  

Effects of fertilization timing on belowground bud bank and its relationship with vegetation of degraded meadow steppe

作　　者：陶金 田家泰 李冬梅 马群[2] 张志铭[1] 刘伟[3] 潘庆民[3] 钱建强 TAO Jin;TIAN Jiatai;LI Dongmei;MA Qun;ZHANG Zhiming;LIU Wei;PAN Qingmin;QIAN Jianqiang(College of Forestry,Henan Agricultural University,Zhengzhou 450002,China;Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China)

机构地区：[1]河南农业大学林学院,郑州450002 [2]中国科学院沈阳应用生态研究所,沈阳110016 [3]中国科学院植物研究所,北京100093

出　　处：《生态学杂志》2025年第3期755-762,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41877542)资助。

摘　　要：气候变化与人为干扰导致我国退化草地面积持续增加,养分添加是恢复退化草地的有效措施之一。本研究以内蒙古半干旱草甸草原退化草地为对象,通过早春融雪期和夏季生长期的氮(N)磷(P)养分共同添加实验,探究地下芽库及其与地上植被关系对不同时期养分添加的响应。结果表明:夏季养分添加显著增加群落整体地下芽库与地上分株密度,而早春养分添加无显著影响,不同时期养分添加显著降低分生组织制约系数。不同植物功能群对养分添加具有差异化响应,具体表现为养分添加显著降低杂类草地上分株密度;夏季养分添加显著增加丛生禾草地下芽和地上分株密度,其分生组织制约系数在不同时期养分添加下均显著降低;不同时期养分添加显著增加根茎型禾草地下芽和地上分株密度。因此,夏季养分添加将极大增加退化草甸草原植被更新潜力,不同植物功能群对养分添加的响应差异将决定草甸草原植被恢复与演替动态。Climate change and human disturbance have resulted in the continuous increase of degraded grassland area in China.Nutrient addition is considered as one of the effective measures for grassland restoration.We conducted a nitrogen(N)and phosphorus(P)addition experiment in a degraded grassland in the semi-arid meadow steppe of Inner Mongolia.We investigated the responses of belowground bud banks and their relationships with vegetation to nutrient additions at different times(early-spring or middle-summer).Results showed that summer nutrient addition significantly increased bud density and aboveground shoot density,while early-spring nutrient addition had no significant influences.Nutrient additions at different times significantly decreased meristem limitation index.Plant functional groups showed specific responses to nutrient addition.Nutrient addition significantly reduced shoot density of forbs.Summer nutrient addition significantly increased bud density and shoot density of bunchgrasses,meristem limitation index,of which was significantly decreased under nutrient addition at different times.Nutrient addition significantly increased both bud density and shoot density of rhizomatous grasses.Our results indicate that summer nutrient addition greatly increases vegetation regeneration potential,and different responses of plant functional groups to nutrient addition determine vegetation restoration and succession dynamics in degraded meadow steppe.

关 键 词：芽库 退化草地 养分添加 植物功能群 植被恢复 

分 类 号：S812.2[农业科学—草业科学] S812[农业科学—畜牧学]