不同时期毛苔草对不同水文情势的生长响应研究

Growth responses of Carex lasiocarpa to different water regimes at different growing stages

通过幼苗移植、水位控制试验,研究毛苔草对不同水文情势的生长响应,以及不同水文经历下的响应差别。结果表明,毛苔草对不同水文情势及水文经历存在显著生长响应。毛苔草地上、地下以及根茎生物量均在干湿交替条件下最大;鲜重根/茎随水分的增加而降低,干重根/茎则总体上随水分的增加而升高;根茎生物量比重在干旱处理下最大。不同水文经历的毛苔草,其生物量以有干湿交替经历的较大,根/茎及根茎占总生物量的比重则以经历干旱处理的较大;淹没水文情势下,毛苔草生长缓慢,但淹没抑制消除后,其生长过程可以通过根茎萌发得以延续。各生长指标极值的出现,要求在不同的生长阶段提供其所需的水文条件。在湿地恢复与管理过程中,针对生长季内优势植物水文需求的变化,采取不同的水文措施,有助于达到最佳的恢复及管理目标。

Growth responses of Carex lasiocarpa to different water regimes and hydrologic experience were studied in seedling transplant and water control experiments. C. lasiocarpa had significant responses to different water conditions. Its above-ground.below-ground nate conditions; fresh root/shoot ratio decreased with and rhizome biomass were biggest under dry-wet alterincreasing water and increased with increasing dryness; the rhizome biomass percentage was greatest under --5 cm water level. For C. lasiocarpa with different hydrologic treatments, the biomass was bigger under dry-wet alternate conditions at some times in the season while root/shoot ratio and rhizome biomass percentage were higher if they had undergone the --5 cm water treatment through the growing season. C. lasiocarpa grew slowly when submerged, but continued by rhizome regeneration after submergence finished. To gain the maximal values of growth indicators, water requirements at different stages must be met. To achieve the optimum goals in wetland restoration and management, water regimes should be regulated according to the plants needs .