摘要
通过对蓟运河故道消落带的土壤种子进行萌发实验,确定了土壤种子库的物种组成、物种多样性指数和相似性指数,并对土壤种子库的物种特征进行了空间层次分析。结果表明:(1)蓟运河故道消落带土壤种子库共有16种植物,隶属于8科15属,其中藜科4种,菊科5种。3个区域土壤种子库物种相对多度和密度大小分布顺序为:洪淹区>偶淹区>常淹区。(2)不同区域种子库的Shannon—Wiener指数和Margalef丰富度指数随着水位的降低呈下降趋势,而生态优势度和Pielou均匀度指数有增大趋势。(3)种子库的空间分布特征明显,其中0—5cm层种子数量最多,为623粒/m2;同时3个区域种子数量差异显著,洪淹区土壤种子库物种数量比偶淹区和常淹区分别多出253和353粒/m2,而偶淹区土壤种子库物种数量与常淹区仅相差100粒/m2。
Seed germination experiments were conducted on the soils collected in the hydro-fluctuation belt along the old channel of Jiyun River. The soil seed bank composition, species diversity, and their similarity and spatial distribution were discussed. Overall, 16 species including 4 species of chenopodiaceae and 5 species of asteraceae, belonging to 8 families and 15 genera, were identified in the soils. Species relative abun- dance and density distribution of the soil seed bank differed in topographic positions, in a descending order as heavily flooded area〉incidentally flooded area〉frequently flooded area. The Shannon-Wiener index and the Margalef Richness Index decreased with water levels, while ecological dominance and Pielou evenness index showed an opposite trend. The seed bank also varied spatially. The 0-5 cm layer was the richest in all three areas in terms of seed number, with a quantity of 623 per m^2. Meanwhile, the seed numbers differed significantly in the three areas; the seed number of heavily flooded area was 253 and 353 per m^2 more than that of the incidentally flooded area and frequently flooded area.
出处
《水土保持通报》
CSCD
北大核心
2013年第2期193-197,202,共6页
Bulletin of Soil and Water Conservation
基金
国土资源部公益性行业科研专项"土壤有机碳项目"(201111015)
天津市科技兴海科研项目(KJXH2011-10)
天津市自然科学基金重点项目(11JCZDJC24500)
关键词
消落带
土壤种子库
蓟运河
hydro-fluctuation belt
soil seed bank
Jiyun River
