%0 Journal Article
%T Growth dynamics,biomass allocation and ecological adaptation in Ceratocarpus arenarius L.<br>角果藜的生长动态及其生殖配置
%A QUAN Dujuan
%A WEI Yan
%A ZHOU Xiaoqing
%A YAN Cheng
%A <br>全杜娟
%A 魏岩
%A 周晓青
%A 严成
%J 生态学报
%D 2012
%I 
%X 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 October, the increase is < 10%. The above ground biomass has two similar peaks, first in May during the initial fruiting stage and later in August to September as the fruit ripens a second time. The below ground biomass increases slowly between March and May and then rapidly peaks during the period of maximum growth. The cumulative dynamics of C. arenarius' amphicarpic biomass reflects its growth characteristics which coincide with its annual life cycle. Reproductive allocation balances the plant's needs to both reproduce and survive. During its entire life cycle, C. arenarius continuously adjust the biomass distribution ratio between its vegetative and reproductive organs, and ultimately reaches a point of high reproductive allocation. C. arenarius begins to flower and fruit about 30 days after germination, at which point it begins its reproductive investment. Later, the reproductive investment increases rapidly, reaching a peak when the fruit ripens. Re
%K growth dynamics
%K reproductive allocation
%K ecological adaptation<br>生长动态
%K 生殖配置
%K 生态适应
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=B33C07A68148C948415A173DBBF93CFA&yid=99E9153A83D4CB11&vid=9971A5E270697F23&iid=708DD6B15D2464E8&sid=ECEBE7D6D77ABD05&eid=51C1C06ED4147660&journal_id=1000-0933&journal_name=生态学报&referenced_num=0&reference_num=36