中国沙棘克隆生长对土壤含水率的需求动态  

Dynamic Demand of the Clonal Growth of Hippophae rhamnoides ssp. sinensis to Soil Moisture

作　　者：邹旭[1] 郭峰 唐翠平 高海银 刘春红 李根前[1] ZOU Xu;GUO Feng;TANG Cui-ping;GAO Hai-yin;LIU Chun-hong;LI Gen-qian(Southwest Forestry University ,Kunrning ,Yunnan G50224 ,China;Qianxinan Bouyei and Miao Nationality Autonomous Prefectures Bureau of Forestry, Xingyi, Guizhou 5 G2400, China;Wanyuan Forestry Science and Technology Extension Center Dazhou, Sichuan 635000, China;Dingbian Country Forestry Station, Dingbian, Shaanxi 718600, China)

机构地区：[1]西南林业大学,云南昆明650224 [2]黔西南布依族苗族自治州林业局,贵州兴义562400 [3]万源林业科技推广中心,四川达州635000 [4]定边县林业工作站,陕西定边718600

出　　处：《西北林学院学报》2018年第3期21-26,共6页Journal of Northwest Forestry University

基　　金：国家自然科学基金(31570609;31070551;30371193);云南省林学一流学科建设项目(51600625)

摘　　要：中国沙棘定居后依靠克隆生长维持种群稳定性,而水分状况是决定克隆生长能力的主导因素,但两者关系的研究目前均以特定年龄种群为对象。本研究基于连续4a的观测结果,探讨中国沙棘克隆生长对土壤含水率需求随种群年龄增长的动态过程。结果表明:1)特定种群年龄下,分株生长、克隆繁殖(子株数量)、生物量积累能力随土壤含水率的增大呈下开口抛物线变化,方程拐点(顶点)即为利于克隆生长的最佳土壤含水率。2)随着种群年龄的增大,分株个体越来越大、克隆子株数量越来越多、生物量越来越高,利于分株树高生长、克隆繁殖、生物量积累的最佳土壤含水率分别从15.67%、15.80%、15.77%升至16.80%、16.32%、16.37%。3)分株生长、克隆繁殖(子株数量)、生物量积累能力之间呈极显著或显著正相关,即具有协同作用。由此可见,特定种群年龄下,克隆生长能力随土壤含水率的增大先升后降;随着种群年龄的增大,利于克隆生长的最佳土壤含水率不断提高。但在不同土壤含水率下,中国沙棘均可通过分株生长、克隆繁殖(子株数量)、生物量积累能力的协同调节,形成与土壤含水率相适应的克隆生长格局,从而以更高的概率维持克隆持久性。Hippophae rhamnoides ssp.sinensis relys on clonal growth to maintain population stability.Water status is the dominant factor in determining its clonal growth capacity.At present,researches on the relationship between the colonal growth and water status are mainly focused on the specific age populations.Based on the observed results for four consecutive years,this paper discussed the dynamic process of the clonal growth of H.rhamnoides ssp.sinensis on soil moisture with the increase of population age.It showed that 1）under the specific population age,ramet growth,clonal propagation（number of filial ramet）and biomass accumulation capacity showed downward opening parabola changes with the increase of soil moisture,and the inflection point（vertex）of the equation was the optimum soil moisture.2）With the increase of population age,ramet individuals,number of filial ramet,and biomass increased.The favorable moisture contents which was beneficial to the ramet height growth,clonal propagation,and biomass accumulation imcreased from 15.67%,15.8%,15.77%to 16.8%,16.32%,16.37%,respectively.3）There were signifi-cant or highly significant positive correlations among the heath growth,clonal propagation,and biomass accumulation,indicating the existence of synergistic effect.It could be seen that the growth capacity of clonal growth increased first and then decreased with the increase of soil moisture at specific population age.With the increase of population age,the optimum soil moisture for clonal growth increased.However,under different soil moistures,H.rhamnoides ssp.sinensis could form a clonal growth pattern corresponding to soil moisture by the synergistic regulation of ramet growth,clonal propagation（number of filial ramet）and biomass accumulation ability,so as to maintain clone persistence with higher probability.

关 键 词：克隆生长 土壤含水率 中国沙棘 毛乌素沙地 

分 类 号：S793.6[农业科学—林木遗传育种]