高寒退化草地狼毒种群株丛间格局控制机理  

Pattern-controlling mechanics of different age classes of Stellera chamaejasme population in degraded alpine grassland

作　　者：高福元[1] 赵成章[1] 

机构地区：[1]西北师范大学地理与环境科学学院,甘肃省湿地资源保护与产业发展工程研究中心,兰州730070

出　　处：《生态学报》2013年第10期3114-3121,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金(40971039,91125014);甘肃省科技支撑计划项目(1011FKCA157);甘肃省生态经济重点学科项目资助

摘　　要：在黑河上游祁连山北坡高寒退化草地,应用Ripley's K函数检测种间格局控制关系的技术方法,按狼毒个体分枝数设置Ⅰ级株丛(1—10枝)、Ⅱ级株丛(11—20枝)、Ⅲ级株丛(21—30枝)、Ⅳ级株丛(31—40枝)、Ⅴ级株丛(40以上)5个株丛,研究了各株丛之间的格局控制关系和空间关联性。结果表明:Ⅲ和Ⅳ级狼毒株丛对其他狼毒株丛有一定的格局控制作用,尤其是Ⅳ级狼毒株丛对其他狼毒株丛格局控制的程度和尺度最大;Ⅳ级狼毒株丛在20cm尺度内和Ⅰ、Ⅱ以及Ⅴ级狼毒株丛表现出正关联,Ⅲ级狼毒株丛在0—10cm尺度上和Ⅰ级狼毒株丛表现为正关联。狼毒种群中两个形体大小越相近的株丛之间存在格局控制关系的可能性相对较小,尤其是在种群内处于劣势地位或受其他株丛格局控制的株丛之间存在格局控制关系的可能性更小,Ⅳ级狼毒株丛表现出较强的格局控制作用,同时对其他狼毒个体有保护作用,在种群内具有重要作用和地位。Different types of pattern can reflect the condition that the population using reveal population biology content and is its external appearance of the status and chamaejasmea is a toxic perennial weed which is widely distributed in the northern the environmental resources and can viability in the community. Stellera grassland of China, showing a large spread of diffusion trend. There are some studies on Stellera chamaejasme pattern and the relationship between Stellera chamaejasmea and Stipa krylovii populations, discussing the diffusion model and laws of SteUera chamaejasmea population. However, these studies can not clearly understand the effect and relationship of the different age class within the Stellera chamaejasmea population, and can not reveal the function and position of the different age class in Stellera chamaejasmea population. Therefore, we use Ripley＇s K function to study the pattern-controlling relationship and spatial association of Stellera chamaejasmea plants. It is critical to revealing the process of the diffusion of cooperation and competition relationships of the Stellera chamaejasmea population in degraded grassland. The experiments were conducted in Auguest, 2009, station a 2 m×2 m plot in Kangle grassland （38°47′15.8″ N,99° 43′ 35.9″ E） Sunan country Gansu province in the upper reaches of Heihe, China. We recorded every one＇s specific location, at last, 151 Stellera chamaejasme plants were counted in the plot. In our experiment, five grades were divided by shoot number of Stellera chamaejasme cluster, cluster grade Ⅰ （1-10）, Ⅱ （11--20）, Ⅲ （21--30）, Ⅳ（31-40） andV （≥40）, among which 126 individual plants were onlevel Ⅰ and accounted for 83.4% of the total ; 15 individual plants were on level Ⅱ and accounted for 9.9% of the total ; 4 individual plants were on both levelⅢ and level Ⅳ and accounted for the same of 2.6% of the total; 2 individual plants were on level Ⅴ and accounted for 1.4% of the total. Calculating the measured valu

关 键 词：狼毒种群 空间分布格局 格局控制关系 空间关联性 黑河上游 

分 类 号：S812[农业科学—草业科学]