论文部分内容阅读
实验室萌发法是目前国内外研究土壤种子库时普遍采用的方法,而实验室与野外自然环境在萌发条件上具有很大的差异,在野外进行萌发实验是否对土壤种子库恢复潜力的估计更具有可靠性?鉴于此,我们在塔里木河下游选择了3个典型断面,分别在野外和实验室进行了土壤种子库萌发实验。结果表明:①野外与实验室萌出的物种相同,但幼苗密度在野外(598.8株.m-2)明显高于实验室(530.3株.m-2)。②物种组成中,豆科物种在野外实验幼苗密度明显较高;若以生活型划分,多年生草本和灌木幼苗密度在野外明显高于实验室。③各物种在野外和实验室的萌发特征相似,但在实验室萌发速度较快,萌发高峰期提前了2~3 d。综合来看,对于塔里木河下游土壤种子库的研究,在野外进行萌发实验其结果更具有可靠性。这对今后土壤种子库的研究具有参考意义。
Laboratory germination method is currently widely used in soil seed bank research at home and abroad, and the laboratory and the natural environment in the germination conditions have great differences in the field of germination experiments on soil seed bank recovery potential estimated more In view of this, we selected three typical sections in the lower reaches of the Tarim River, and germinated the soil seed bank in the field and in the laboratory respectively. The results showed that: (1) The species in field and laboratory were the same, but the density of seedling in the field (598.8, m-2) was significantly higher than that in laboratory (530.3, m-2). ②In species composition, the density of legume species in the field was obviously higher; if the life style was divided, the density of perennial herbaceous and shrub seedlings in the field was significantly higher than that in the laboratory. ③ The germination characteristics of each species in the field and in the laboratory were similar, but germination rate was faster in the laboratory and the peak period of germination was 2 ~ 3 days earlier. Taken together, the research on the soil seed bank in the lower reaches of the Tarim River is more reliable in germination experiments in the wild. This study of soil seed bank for future reference.