摘要
针对准噶尔盆地荒漠绿洲过渡带3个不同地下水埋深(GW1=4.78 m,GW2=9.39 m,GW3=11.76 m)条件下的人工梭梭(Haloxylon ammodendron)种群进行了深入的年龄结构特征分析,旨在揭示种群的生存状况,并预测种群未来的发展趋势,为荒漠绿洲过渡带梭梭种群的经营与恢复提供理论依据。研究基于静态生命表、存活曲线对种群结构进行分析,结合时间序列模型预测了未来2、4、6个龄级后种群的变化趋势。研究结果表明:(1)3个梭梭种群年龄结构呈金字塔型,均为增长型种群,其中GW1种群生长潜力最大,幼龄林比例达73%。(2)3个种群的存活曲线均趋近于Deevey-Ⅱ型,种群在各年龄段死亡率相对稳定,地下水位的降低限制了幼苗的生长,导致种群自疏现象提前出现。(3)3个种群均为易受干扰的增长型种群,幼林数量基本可以补充由于中、老龄级个体死亡造成的缺失。对于水分补给有限的种群出现树龄大、树高小的小老树,幼苗稀少,种群提前进入衰退期的现象应该予以关注,需加强对衰老龄级个体的精准抚育管理。
This study conducted an in-depth analysis of the age structure characteristics of artificial Haloxylon ammodendron(hereafter H.ammodendron)populations with different groundwater depths(GW1=4.78 m,GW2=9.39 m,and GW3=11.76 m)in the desert-oasis transition zone of the Junggar Basin.The objective is to reveal the current survival status of the populations,predict their development trends,and provide theoretical support for the management and restoration of Haloxylon ammodendron populations in the desert-oasis transition zone.Based on static life tables and survival curves,the population structure was analyzed,and the future trends of the population after 2,4,and 6 age classes were predicted using time series models.The results showed that:(1)The age structure of the three H.ammodendron populations exhibited a pyramidal shape,indicating growth-type populations.Among them,the GW1 population had the greatest growth potential with a juvenile forest proportion of 73%.(2)The survival curves of the three populations converged to Deevey-II type,indicating relatively stable morality rates across different age groups.The decrease in groundwater level limited the growth of seedlings,leading to the premature occurrence of self-thinning in the population.(3)All three populations were growth-type populations susceptible to disturbance,and the number of young forests could basically replenish the deficit caused by the death of middle-aged and old-aged individuals.Attention should be paid to the phenomenon of small and senescent trees with old age and small height,sparse seedlings,and premature entry into the decline phase in populations with limited water replenishment.It is necessary to strengthen precise care and management of aging individuals.
作者
朱美菲
韩政伟
雷春英
王湘莲
程金花
张友焱
ZHU Meifei;HAN Zhengwei;LEI Chunying;WANG Xianglian;CHENG Jinhua;ZHANG Youyan(College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Institute of Afforestation and Sand Control,Xinjiang Academy of Forestry Sciences,Xinjiang Jinghe Desert Ecosystem Research Station,Urumqi 830063,China;Institute of Ecological Protection and Restoration,Chinese Academy of Forestry Sciences,Beijing 100091,China)
出处
《生态学报》
CAS
CSCD
北大核心
2024年第19期8688-8698,共11页
Acta Ecologica Sinica
基金
“十四五”国家重点研发计划项目(2022YFF1302504)。
关键词
人工梭梭林
种群结构
静态生命表
时间序列分析
artificial H.ammodendron
population structure
static life table
time series analysis
