摘要
本研究旨在探讨平茬措施对天山北坡浅山带灌木群落生长及碳收支能力的影响。在黑果小檗(Berberis atrocarpa)、宽刺蔷薇(Rosa platyacantha)和金丝桃叶绣线菊(Spiraea hypericifolia)灌木群落内,分别设置4种不同平茬高度处理:全部平茬(QP)、留茬高度为株体原高度的1/2(LG_(1/2))、留茬高度为株体原高度1/4(LG_(1/4))、未平茬对照(CK),监测灌木群落生长指标(地径、冠幅、枯枝比、新枝长)、碳收支及土壤微生物和酶活性变化。研究结果表明:(1)灌木群落的生长指标对QP处理响应最为明显,新枝高度增加109.2%并且枯枝比降幅达到88.1%,QP处理的差异性显著增加。(2)QP、LG_(1/2)、LG_(1/4)平茬处理分别提高了灌木群落的净生态系统CO_(2)交换(NEE)195.3%、157.6%、177.4%,分别降低生态系统呼吸(ER)51.2%、51.7%、66.5%,降低了土壤呼吸(RS)67.4%、49.6%、12.2%,3种平茬处理的灌木群落碳交换均与对照呈现出显著性差异。(3)平茬处理明显提高灌木群落土壤碳含量和酶活性,土壤碳交换与土壤生物因子(微生物量碳、土壤有机碳、土壤酶活性)显著正相关。综上所述,合理的平茬措施能有效提升天山北坡浅山带灌木群落的生长及固碳能力,全部平茬在该区域内对促进灌木群落生长和提高碳汇功能最为有效,对减缓区域大气中CO_(2)的增长具有积极作用。
This study aims to investigate the effects of stumping on the growth and carbon sequestration capacity of shrub communities in the low mountain belt on the northern slope of the Tianshan Mountains.Within the shrub communities of Berberis atrocarpa,Rosa platyacantha and Spiraea hypericifolia,four different stumping height treatments were set up:complete stumping(QP),leaving 1/2 of the original plant height(LG_(1/2)),leaving 1/4 of the original plant height(LG_(1/4)),and an un-coppiced control(CK).The growth indices of the shrub communities(ground diameter,crown width,dead branch ratio,and new branch length),carbon sequestration,and changes in soil microbial and enzyme activities were monitored.The results showed that:(1)The growth indices of the shrub communities were most responsive to the QP treatment,with new branch height increasing by 109.2%and the dead branch ratio decreasing by 88.1%,resulting in significant differences in the QP treatment.(2)The QP,LG_(1/2),and LG_(1/4)treatments increased the net ecosystem CO_(2)exchange(NEE)of the shrub communities by 195.3%,157.6%,and 177.4%,respectively,and decreased ecosystem respiration(ER)by 51.2%,51.7%,and 66.5%,respectively,and soil respiration(RS)by 67.4%,49.6%,and 12.2%,respectively.The carbon exchange of the shrub communities under the three stumping treatments showed significant differences compared with the control.(3)stumping significantly increased soil carbon content and enzyme activity in the shrub communities,and soil carbon exchange was significantly positively correlated with soil biotic factors(microbial biomass carbon,soil organic carbon,and soil enzyme activity).In conclusion,rational stumping measures can effectively enhance the growth and carbon sequestration capacity of shrub communities in the low mountain belt on the northern slope of the Tianshan Mountains.Complete stumping(QP)is the most effective in promoting shrub community growth and enhancing carbon sink function in this area,and it has a positive effect on mitigating the increase of CO_(2)in the regional atmosphere.
作者
刘鑫
张毓涛
师庆东
李吉玫
孙雪娇
LIU Xin;ZHANG Yutao;SHI Qingdong;LI Jimei;SUN Xuejiao(College of Ecology and Environment,Xinjiang University,Urumqi 830017,Xinjiang,China;Xinjiang Academy of Forestry,Urumqi 830063,Xinjiang,China;Xinjiang Tianshan Forest Ecosystem National Observation and Research Station,Urumqi 830063,Xinjiang,China)
出处
《干旱区研究》
北大核心
2025年第5期895-906,共12页
Arid Zone Research
基金
新疆维吾尔自治区自然科学基金项目(2023D01A90,2022D01B174)。
