沙漠公路防护林乔木状沙拐枣的平茬效益分析  

Analysis on the Cutting Benefit of Calligonum arborescens in Shelterbelt Along the Tarim Desert Highway

作　　者：李应罡[1] 徐新文[1] 李生宇[1] 张建国[1] 孙树国[1] 

机构地区：[1]中国科学院新疆生态与地理研究所

出　　处：《干旱区资源与环境》2008年第8期196-200,共5页Journal of Arid Land Resources and Environment

基　　金：中国科学院重要方向项目(KZCX3-SW-342);中国科学院"西部之光"人才培养计划项目(20052118);塔里木沙漠公路防护林体系可持续技术研究(2005BA901A21)资助

摘　　要：在极端生境胁迫下,乔木状沙拐枣种植7-8年后即出现长势减弱,自然枯死等现象,本文对7a生乔木状沙拐枣植株进行了人工平茬试验,并对其平茬效益做了分析,得出以下结论:(1)乔木状沙拐枣的再生能力较强,第一次平茬后新生枝株高,冠幅,地径等迅速增长,且经过第二次平茬后仍能保持良好的生长状态,生物效益显著。(2)平茬后乔木状沙拐枣生长旺盛,特别是同化枝表面积增长最快,第一次平茬植株生长2年后其同化枝面积大小已接近未平茬植株。(3)在沙漠公路防护林现有的管理模式和灌溉制度下,对老化衰退的乔木状沙拐枣植株进行平茬后,取得了良好的效果。平茬促进了乔木状沙拐枣的生长发育,从复壮更新的角度来看,有利于乔木状沙拐枣的再生和防护林生态利用率的提高。Under the stress of extreme habitat, weakened growth vigor and natural wilt were found in 7 - 8 years old Calligonum arborescens. Thus, the experiment of cutting was carried out for CaUigonum arborescens （7a）, and then its benefit was analyzed based on the monitoring data in middle part of shelterbelt along the Tarim Desert for long time. The results showed that ： （ 1 ） After cutting for the first time, the growth of CaUigonum arborescens increased obviously such as in height, crown extent, root diameter. Therefore the ability of regeneration was strong. After twice cutting, the growth state was still good; the biological benefit was notable. （2）The growth of Calligohum arborescens was in bloom, especially for assimilation branch after cutting. The area of assimilation branch after cutting two years was close to the comparison. （3） On the condition of existing management pattern and irrigation rule of shelterbelt along the Tarim Desert highway aged Calligonum arborescens were to rejuvenate and grew well. Cutting accelerated the growth and development of Calligonum arborescens, from the point of rejuvenation and renovation, this measurement is good for regeneration.

关 键 词：沙漠公路 乔木状沙拐枣 平茬 复壮 效益分析 

分 类 号：S793.1[农业科学—林木遗传育种]