河岸带中荆三棱的生长特性及其腐烂规律研究

为了了解在河岸带生态恢复中植物的生长及其作用,在中试规模上对河岸带中的荆三棱进行了1 a研究.荆三棱在不同水深区域的生长高度与密度表明荆三棱对水深的耐受性不强,更适合于在浅水域生长.秋季收割与不收割的对比表明秋季收割有利于荆三棱第2年的生长与发芽.荆三棱生物量及其中的N、P在地上、地下的分布表明地下荆三棱的生物量比地上多大约55％,地下荆三棱生物固定的N、P总量分别大约比地上荆三棱生物固定的N、P总量多50％和126％.在河岸带通过收割荆三棱可以分别带走荆三棱所固定的全部N、P的40.5％和30.6％.地上荆三棱经过130 d的浸泡,其重量损失率有27.10%, TN、TP的损失分别为40.80%和76.80%.浸泡植物释放出的污染物基本没有积累现象.

Research on Growth Characteristic of Scirpus yagara Ohw and Its Decomposition on the Riparian Zone

In order to understand growth of plant and its effect on ecological restoration of riparian zone, pilot-scale Scirpus yagara ohw. riparian zone had been studied for one year. Height and density of Scirpus yagara ohw in different water depth showed that the water depth endurance of Scirpus yagara ohw is not strong, and it grows and germinates better in shallow water. Contrast between harvest area and without harvest area showed that harvest is good for germination and growth of Scirpus yagara ohw in next year. Distribution of biomass and N and P fixation between the underground and overground Scirpus yagara ohw showed that N and P fixation of the underground is 50% and 126% more than that of the overground, respectively. Harvest of the overground Scirpus yagara ohw can remove 40.5% of the total N and 30.6% of the total P. Dunked in water for 130 days, the overground Scirpus yagara ohw lose 27.10% of its dry weight, 40.80% of the total N and 76.80% of tha total P. And the released pollutants have no serious cumulation in water.