沙棘人工林早衰及其更新复壮  

Premature Senescence and Rejuvenation of Hippophaessp.Plantation

作　　者：唐翠平[1] 乌拉[2] 袁思安[1] 郭峰[1] 李根前[1] 尤燕 

机构地区：[1]西南林业大学,云南昆明650224 [2]中国林业科学研究院沙漠林业实验中心,内蒙古磴口015200 [3]陕西省定边县乱井子机械林场,陕西定边718699

出　　处：《西北林学院学报》2014年第5期47-52,共6页Journal of Northwest Forestry University

基　　金：国家自然科学基金(31070551)

摘　　要：针对沙棘人工林大面积早衰问题,在分析其特征、成因的基础上提出更新复壮途径。结果表明:沙棘人工林早衰表现为寿命缩短、生长和繁殖能力下降,形成原因主要包括干旱胁迫、造林密度大、不合理的造林设计等。考虑沙棘克隆习性与生境异质性的耦合作用,可通过及时平茬、配方施肥(激素)、异质性造林设计、径流林业技术促进营养生长和克隆繁殖,从而达到更新复壮或长期维持种群稳定性和克隆持久性之目的。今后应加强沙棘人工林早衰及平茬更新机制研究,为种群持久性维持及早衰种群的复壮提供依据。Aiming to solve the problem of premature senescence occurring in a large area of Hippophae ssp.plantation,based on the analysis of the cause of its characteristics,rejuvenation ways for the plantations were discussed.The main features of premature senescence were shortened life expectancy,reduced abilities of growth and reproduction.These were resulted from drought stress,high planting density,and unreasonable afforestation design.Owing to Hippophae ssp.＇s cloning habits and coupling effects of habitat heterogeneity,effective rejuvenation approaches were proposed,such as timely stumping,formula fertilization（hormones）,heterogeneity afforestation design and runoff forestry technology to promote vegetative growth and clonal propagation,to maintain long-term population stability and cloning persistencey.It was suggested in the future to strengthen the researches in mechanism of premature senescence and rejuvenation,in order to provide evidence for it＇s population persistency and rejuvenation.

关 键 词：沙棘人工林 早衰特征 早衰成因 更新复壮 

分 类 号：S725.7[农业科学—林木遗传育种]