角果藜的生长动态及其生殖配置  

Growth dynamics,biomass allocation and ecological adaptation in Ceratocarpus arenarius L.

作　　者：全杜娟[1] 魏岩[1] 周晓青 严成[3] 

机构地区：[1]新疆农业大学草业与环境科学学院,新疆草地资源与生态重点实验室,乌鲁木齐830052 [2]宝鸡石油中学生物组,宝鸡721001 [3]中国科学院新疆生态与地理研究所,乌鲁木齐830011

出　　处：《生态学报》2012年第11期3352-3358,共7页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30770374,30660033)

摘　　要：通过对角果藜(Ceratocarpus arenarius L.)的地上与地下部分生长动态以及生物量配置进行研究,结合其生活周期内土壤含水量变化规律,分析了角果藜的生态适应对策。结果表明:①角果藜植株高度生长速率随时间变化呈"增加—减缓—增加"的模式,而根的生长速率呈"逐渐减缓"的模式。角果藜株高、垂直根的生长速率变化同土壤水分的变化密切相关。②地上部分生物量在5月果实初形成时期和8月至9月的果实成熟期形成两个高峰值。地下部分生物量在3月至5月增长缓慢,随后以最大增长速率迅速达到地下生物量的最大值。角果藜地上、地下生物量的积累动态体现了其与季节变化相吻合的生长发育特点。③具有地上地下结果性的角果藜的生殖配置高达40%以上,高于一次结实的草本植物的生殖投入。这些特性是角果藜适应荒漠生境生长策略选择的综合表现。Plant biomass results from a combination of plant and environmental factors. It not only reflects the plant＇s ability to adapt to the environment and grow, it also reflects the effect of environmental conditions on the plant. The study of a plant＇s dynamic life processes is important, such as studying its relationships to and the influence of environmental conditions. This information can then be used in analyzing the ecological aspects of a plant＇s ability to adapt to the environment and in understanding the tactics a plant uses to survive. Ceratocarpus arenarius L. （Chenopodiaceae） is an endemic annual species of central Asia and is widespread in the central Asiatic desert. In China, it grows only in the Junggar Basin, is able to form synusia in parts of Junggar Basin, and is very ecologically important. This amphicarpic species produces both aerial and subterranean fruits. We investigated above and below ground biomass growth dynamics, plant height and root depth of C. arenarius, and analyzed the plant＇s strategies for ecological adaptation including a study of the soil water content at different stages of its life cycle to better understand how the plants adapt to their desert habitat. During its life, the plant＇s growth rate in height had an annual pattern of increasing-decreasing-increasing. In April it grows slowly at first and then increases its rate of growth reaching a maximum plant height in May. The growth rate decreases in summer until it quickly increases again in August reaching a second peak in plant height during September. During its entire life cycle, the root length increases most rapidly between April and June, peaking in April, and then decreases. Maximum root depth is achieved in August and then decreases gradually. The root depth is closely correlated to soil water content in different stages of the plant＇s life history. Soil water content peaks in April, and then decreases rapidly, reaching a minimum in July. Although soil water content rises gradually between August and O

关 键 词：生长动态 生殖配置 生态适应 

分 类 号：Q948[生物学—植物学]