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土壤种子库是植被更新和恢复的物质基础,对地面植被恢复有着重要意义。以江西省兴国县飞播马尾松林为研究对象,通过标准地调查、土壤理化性状测定及土壤种子库萌发试验,分析土壤种子库的萌发特征及其与土壤因子的关系。结果表明:土壤种子库有23种植物,隶属于17个科,0~10 cm土层种子密度为9.8×102粒m~(-2)。不同坡位土壤种子达到萌发最高峰的时间、萌发平缓期持续的时间相差不大,但单子叶植物与双子叶植物间达到萌发峰值点的时间有所差异;萌发种子数与时间关系呈双“S”型曲线,表现出“平缓-上升-平缓-上升-平缓”的变化过程。采用主成分分析提取非毛管孔隙、土壤含水量、全N、全P、有机质5个变量进行冗余分析,得出对土壤种子库影响较大的是非毛管孔隙度与土壤含水量。
Soil seed bank is the material basis for vegetation regeneration and restoration, which is of great significance to the restoration of ground vegetation. Taking Pinus massoniana forest in Xing Guo County, Jiangxi Province as the research object, the germination characteristics of soil seed bank and its relationship with soil factors were analyzed through standard survey, soil physical and chemical properties determination and soil seed bank germination test. The results showed that there were 23 kinds of plants in soil seed bank, belonging to 17 families. The seed density in 0 ~ 10 cm soil layer was 9.8 × 102 grains m -2. The time for germination peak to peak in different slope positions was similar to that in the period of germination and flattening, but the time to reach the peak of germination was different between monocotyledon and dicotyledon. The relationship between germination number and time was double “S” curve, showing “gentle - rising - gentle - rising - gentle ” change process. Principal component analysis was used to extract the non-capillary porosity, soil water content, total N, total P and organic matter for redundancy analysis. The results showed that non-capillary porosity and soil water content were the most important factors affecting the soil seed bank.