中国沙棘克隆生长对不同光照强度的响应

利用遮阳网产生的不同光照强度（100％、70％、50％和20％的自然光照），研究了中国沙棘克隆生长对不同光照强度的响应规律。结果表明，（1）当光照强度从20％逐渐增加到100％时，种群生长量、生物量积累与分配、地下克隆器官参数等增幅均呈二次抛物线变化，相对光照强度为50％～70％是其克隆生长的最佳光照强度。（2）种群生长量、种群及各器官生物量、子株数量及萌蘖根生长量增幅最大时的光强分别为48.0％～61.7％、52.8％～53.6％、55.6％～57.6％，且分株生长量和种群生物量、萌蘖根生长量和子株数量之间具有协同作用，而营养生长和克隆繁殖之间存在权衡关系。（3）在适宜的光照强度下，种群以分株比较高大且分布相对密集为特征，生长格局倾向于集团型；在光照强度过大或过小的情况下，种群以分株比较矮小且分布相对稀疏为特征，生长格局倾向于游击型。当光照强度由低到高变化时，生长格局将由游击型到集团型再到游击型，形成一个觅养对策连续体。

The Clonal Growth of Hippophae rhamniodes L.subsp.sinensis in Response to Different Light Intensity

The clonal growth of Hippophae rhamniodes L.subsp.sinensis in response to different light intensity （100%, 70 %, 50%and 20%of nature light ） by using shading net was studied , and the results showed： 1 ） The population growth, the biomass accumulation and its distribution , underground clonal growth parameters , and ect. were all showed a change of quadratic parabolic curve with the light intenstity increasing from 20%to 100%, and the best light intenstity for clonal growth was 50%-70%.2 ） The optimum light intensity for population growth , biomass of community and different organs , daughter ramet number and spacer growth were 48.0 %-61.7 %, 52.8 %-53.6 %, and 55.6%-57.6% respectively , and there was a cooperative function and a trade-off relation among them .3 ） At the optimum light intenstity , the population was characterised by individual tall and concentrated distribution , and it growth partern tended to a phalanx type .For too much or too small light intensity, the population was characterized by individual low and dispersed distribution , and its growth pattern tended to a guerrilla type .The population growth patterns would change from guerrilla type to phalanx type , and then to guerrilla type , and formed a foraging strategies continuum with the increasing of light intensity .