Sun Li-Fang, Sun Yi-Xiang, Zhou Chang-Fang, An Shu-Qing
Institute of Wetland Ecology, Nanjing University, Nanjing 210093, China.
Ying Yong Sheng Tai Xue Bao. 2009 Oct;20(10):2370-6.
Four nutrient levels, i.e., 0.5 mg N x L(-1) and 0.1 mg P x L(-1) (I), 1.5 mg N x L(-1) and 0.3 mg P x L(-1) (II), 4.5 mg N x L(-1) and 0.9 mg P x L(-1) (III), and 13.5 mg N x L(-1) and 2.7 mg P x L(-1) (IV), were installed to study the effects of water body's nutrient level, plant species combination, and their interactions on the biomass accumulation and allocation of invasive floating species Eichhornia crassipes, native rooted leaf-floating species Jussiaea stipulacea, and submerged plant Vallisneria spiralis. The total, root, stem, and leaf biomass of E. crassipes and J. stipulacea, either in monoculture or in mixed-culture, increased with increasing water body's nutrient level, their total biomass in treatments III and IV being averagely 54.47% and 102.63% higher than that in treatments I and II, respectively. Under different plant species combination, the total, root, stem, and leaf biomass of V. spiralis showed a declining trend with the increase of nutrient level, and the total biomass of V. spiralis in treatments III and IV was averagely 45.88% lower than that in treatments I and II. The results of two-way ANOVA showed that water body's nutrient level had significant positive effects on the biomass of E. crassipes and J. stipulacea but negative effects on that of V. spiralis, and the effects of plant species combination varied with target plant species.
设置了四个营养水平，即0.5毫克氮/升和0.1毫克磷/升（I）、1.5毫克氮/升和0.3毫克磷/升（II）、4.5毫克氮/升和0.9毫克磷/升（III）以及13.5毫克氮/升和2.7毫克磷/升（IV），以研究水体营养水平、植物物种组合及其相互作用对入侵漂浮物种凤眼莲、本地生根叶漂浮物种黄花水龙和沉水植物苦草生物量积累与分配的影响。凤眼莲和黄花水龙在单种栽培或混种栽培时，其总生物量、根生物量、茎生物量和叶生物量均随着水体营养水平升高而增加，处理III和IV中的总生物量分别比处理I和II中的平均高出54.47%和102.63%。在不同植物物种组合下，苦草的总生物量、根生物量、茎生物量和叶生物量随营养水平升高呈下降趋势，处理III和IV中苦草的总生物量比处理I和II中的平均低45.88%。双向方差分析结果表明，水体营养水平对凤眼莲和黄花水龙的生物量有显著正向影响，但对苦草的生物量有负向影响，且植物物种组合的影响因目标植物物种而异。
