石羊河下游不同立地类型黑果枸杞种群结构及数量动态研究  

Population Structure and Quantitative Dynamics of Lycium barbarum in Different Site Types in the Lower Reaches of Shiyang River

作　　者：赵艳丽[1,2,3] 郭春秀 安富博[1] 赵鹏 赵赫然[1,4] 王飞[1,2] ZHAO Yanli;GUO Chunxiu;AN Fubo;ZHAO Peng;ZHAO Heran;Wang Fei(Gansu Desert Control Research Institute,Lanzhou Gansu 730070,China;State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating,Wuwei Gansu 733000,China;Gansu Minqin Desert Grassland Ecosystem National Field Scientific Observatory and Research Station,Minqin Gansu 733300,China;Gansu Hexi Corridor Forest Ecosystem National Positioning Observatory and Research Station,Wuwei Gansu 733000,China)

机构地区：[1]甘肃省治沙研究所,甘肃兰州730070 [2]甘肃省荒漠化与风沙灾害防治国家重点实验室培育基地,甘肃武威733000 [3]甘肃民勤荒漠草地生态系统国家野外科学观测研究站,甘肃民勤733300 [4]甘肃河西走廊森林生态系统国家定位观测研究站,甘肃武威733000

出　　处：《甘肃农业科技》2022年第7期35-43,共9页Gansu Agricultural Science and Technology

基　　金：国家自然科学基金“石羊河下游非地带性土壤对黑果枸杞种群空间分布格局的影响机制”(31560128);国家自然科学基金“干旱区地带性植物对土壤环境沼泽化的应急响应机制”(32060371);甘肃省自然科学基金“石羊河下游青土湖典型植被固沙机制及其对风沙活动的响应”(20JR5RA095)。

摘　　要：以黑果枸杞为优势种的天然灌木群落是石羊河下游的重要植被建群种之一,为揭示该地区黑果枸杞种群动态变化特征,探索其生态价值,基于对石羊河下游不同生境黑果枸杞天然种群的样地调查,对其年龄结构、静态生命表、动态指数、存活曲线进行了分析研究。结果表明,不同立地类型黑果枸杞种群均表现为新苗和幼龄个体丰富,中老龄个体少;种群在Ⅲ龄级时死亡率最高,种群亏损率与死亡率保持一致。各样地种群动态指数基本为正值,说明黑果枸杞种群整体处于稳定增长的发育状态。盐碱地、覆沙地和砾石地黑果枸杞的存活曲线均接近于Deevey-Ⅲ型,固定/半固定沙地的存活曲线为Deevey-Ⅱ型。不同立地类型黑果枸杞种群的4个生存函数变化除局部有差异外整体趋势较为一致,各样地中黑果枸杞种群累积死亡率F(t)和危险系数λ(t)在Ⅰ龄级向Ⅲ龄级过渡时呈现逐渐增大的趋势,生存率S(t)和死亡密度函数f(t)随龄级呈单调递减的趋势。总体上黑果枸杞种群呈现出前期增长、中期稳定、后期衰退的特征。Lycium barbarum is the dominant species in the natural shrub community in the lower reaches of Shiyang River and is considered as one of the constructive species as well.To reveal the population dynamic variation and to explore the ecological value of Lycium barbarum,the age structures,static life tables,dynamic indexes and survival functions of Lycium ruthenicum were analyzed.Results indicated that the population of different site types of Lycium ruthenicum showed abundance in both new seedlings and young individuals and less numbers for middle-aged and old individuals.The death rate of Lycium ruthenicum population was the highest at ageⅢ,the loss rate was consistent with the death rate.The population dynamic indexes of various plots were basically positive values,which indicated that the population of Lycium ruthenicum was in a stable growth status.Survival curves of Lycium ruthenicum on the saline-alkali land,sandy land and gravel land were close to Deevey-Ⅲtype,the survival curves of Lycium ruthenicum on the fixed and semi-fixed sandy land were Deevey-II type.The changes of four survival functions of Lycium ruthenicum populationin different site types showed the same overall trend except for local differences.The death rate F(t)and danger coefficientλ(t)showed a trend of gradual increase and the survival rate S(t)and death density function f(t)of Lycium barbarum population showed a monotonous decreasing trend during the transition fromⅠtoⅢage class.Overall,the population of Lycium ruthenicum was increased in the early period,stable in the middle period and declining in the late period.

关 键 词：石羊河下游 立地类型 黑果枸杞 种群结构 数量动态 

分 类 号：S567.19[农业科学—中草药栽培] S718.5[农业科学—作物学]