摘要
在沙地环境中,沙埋是影响植物幼苗存活的一个重要因素。中间锦鸡儿(C arag ana interm ed ia)是浑善达克沙地和毛乌素沙地固定和半固定沙丘上常见的一种沙生灌木。为了研究沙埋对其幼苗存活以及生长的影响,对出土后生长了1个月的中间锦鸡儿实生苗进行沙埋实验,实验处理:TC为对照,T1为沙埋幼苗地上部的1/3,T2为沙埋幼苗地上部的1/2,T3为沙埋到幼苗的近顶端。实验持续4周,每周收获1次。结果表明:TC、T1和T2没有幼苗死亡,T3有20%的幼苗死亡;沙埋对中间锦鸡儿幼苗的生物量、根冠比、根生物量比和茎生物量比有显著影响,叶片生物量比各处理没有显著差异,沙埋对幼苗的叶面积没有显著影响,在第1周T2和T3的小叶片面积显著大于TC,在其余3周,TC与T1、T2的小叶片面积没有显著差异,与全埋则有显著差异;沙埋对幼苗的相对生长速率(RGR)和净同化速率(N AR)产生显著影响,实验结束时,T3处理幼苗的RGR和N AR显著地小于其它3个处理。上述结果表明,部分沙埋(T1、T2)对沙生灌木中间锦鸡儿幼苗的生长发育没有显著的影响,而全部沙埋(T3)对其幼苗的生长发育产生显著的抑制,中间锦鸡儿是一个比较耐沙埋的物种。
Sand burial is one of the main factors that affect psammophilous shrub and one of the commonly occurred species seedling survival in sand land. Caragana intermedia is a in fixed and semi-fixed sand dunes in the Otindag Sand Land and the Mu US Sand Land. In order to investigate the impacts of sand burial on seedling survival and growth of the species, seed-originated seedlings of Caragana intermedia grown in greenhouse for a month were buried by sand with four experimental treatments ： Tc, control ; T1, one third of the above ground section was buried by sand ; T2, half of the above ground sec was buried by sand; and T3, all of the above ground section was buried by sand. The growth of the seedlings in different treatments was examined by harvests performed once a week during a period of four weeks. The results showed that： During the four weeks, there was no seedling decease in Tc, T1 and T2, but 20% seedlings died in T3. Sand burial had significant effects on biomass accumulation, root/shoot （R/S） ratio, root mass ratio and stem mass ratio of seedlings. Root/shoot （R/ S） ratio and root mass ratio decreased with the increasing of depth of burial. There was no significant difference among leaf mass ratios in the four treatments. Sand burial had not significant effect on leaf area of seedlings. Leaflet area of seedlings was significantly larger in T2 and T3 than in Tc at the first harvest. Comparing with control, T1 and T2 treatments did not have significantly effect on leaflet area of seedlings, but T3 treatment did at the trended to decrease with age in all four treatments. Sand burial had significan other three harvests. Leaflet area of seedlings effects on relative assimilation rate （NAR） of seedlings. RGR and NAR of seedlings were significantly lower in growth rate （RGR） and net T3 than in the other three treatments at the end of experiment, but no significant difference existed among Tc, T1 and T2 treatments. These results suggest that partial sand burial of above ground section （T1 and T2） may not affect growth and development of Caragana intermedia seedlings, whereas full sand burial of above ground section may do. Caragana intermedia could be a sand burial tolerant species.
出处
《生态学报》
CAS
CSCD
北大核心
2005年第10期2550-2555,共6页
Acta Ecologica Sinica
基金
中国科学院知识创新工程重大资助项目(KSCX1-08)
国家重点基础研究发展规划资助项目(G1999043507)~~
关键词
沙埋
根冠比
相对生长速率
净同化速率
中间锦鸡儿幼苗
sand burial
root/shoot ratio
relative growth rate
net assimilation rate
Caragana intermedia seedlings
