By using the simulated ditch experiment,the differences of nitrogen and phosphorus absorption capacities of 9 aquatic plants were studied,and the better varieties of nitrogen and phosphorus absorption capacity were se...By using the simulated ditch experiment,the differences of nitrogen and phosphorus absorption capacities of 9 aquatic plants were studied,and the better varieties of nitrogen and phosphorus absorption capacity were selected to construct the ecological ditch and oxidation pond to study the nitrogen and phosphorus absorption effect.The results showed that the nitrogen and phosphorus residues in the simulated ditch water were signi ficantly reduced after planting aquatic plants.The biomass of Canna glauca,Myriophyllum elatinoides,Sorbaria sorbifolia,Pontederia cordata and Zizania was high,and the uptakes of nitrogen and phosphorus were high.Among them,the effect of planting Canna glauca and Myriophyllum elatinoides was the best.The concentration of nitrogen and phosphorus in farmland drainage decreased signi ficantly after being absorbed by aquatic plants in ecological ditches;the concentration of total nitrogen,soluble nitrogen and total phosphorus in main ditches decreased by 39.6%,40.1% and 36.9% respectively on average;the concentration of total nitrogen,soluble nitrogen and total phosphorus in branch ditches decreased by 6.6%,10.3% and 13.6% on average.The concentration of total nitrogen and total phosphorus in the oxidation pond could be further reduced by 17.7%and 13.3%.Ecological ditches can effectively intercept nitrogen and phosphorus in water,and have good ecological benefits of purifying water to obtain improved water quality.展开更多
为摸清中巴喀喇昆仑公路（简称中巴公路）30年运营对两侧植被的影响范围与程度、公路干扰区域（取弃土场、施工便道等）处植被自然恢复能力，采用样线法和样方法于2009年9月20日～28日、2010年9月8日～15日和2011年9月22日～27日对中巴...为摸清中巴喀喇昆仑公路（简称中巴公路）30年运营对两侧植被的影响范围与程度、公路干扰区域（取弃土场、施工便道等）处植被自然恢复能力，采用样线法和样方法于2009年9月20日～28日、2010年9月8日～15日和2011年9月22日～27日对中巴公路雷克特桥至红其拉甫段（即 K470＋500～K811＋343段）两侧200 m 范围内的各种植被类型及工程占地干扰区域进行了调查和实测。结果显示：公路两侧0～1 m 范围内（即土质边沟处）的物种丰富度、盖度均显著高于99～100 m（自然背景）处，且生物量、多样性指数、优势度指数和均匀度指数均有高于其他距离的趋势；公路路侧干扰样方在外貌、结构组成上已与天然背景样方的植物群落无明显的不同，但植物群落盖度、种类组成、植株高度，随着植被类型的不同与天然群落稍有差别。本研究为正在建设中的中巴公路改扩建工程的生态排水沟建设、植被恢复技术策略（以自然恢复为主、人工恢复为辅）的制定提供了理论依据。展开更多
文摘By using the simulated ditch experiment,the differences of nitrogen and phosphorus absorption capacities of 9 aquatic plants were studied,and the better varieties of nitrogen and phosphorus absorption capacity were selected to construct the ecological ditch and oxidation pond to study the nitrogen and phosphorus absorption effect.The results showed that the nitrogen and phosphorus residues in the simulated ditch water were signi ficantly reduced after planting aquatic plants.The biomass of Canna glauca,Myriophyllum elatinoides,Sorbaria sorbifolia,Pontederia cordata and Zizania was high,and the uptakes of nitrogen and phosphorus were high.Among them,the effect of planting Canna glauca and Myriophyllum elatinoides was the best.The concentration of nitrogen and phosphorus in farmland drainage decreased signi ficantly after being absorbed by aquatic plants in ecological ditches;the concentration of total nitrogen,soluble nitrogen and total phosphorus in main ditches decreased by 39.6%,40.1% and 36.9% respectively on average;the concentration of total nitrogen,soluble nitrogen and total phosphorus in branch ditches decreased by 6.6%,10.3% and 13.6% on average.The concentration of total nitrogen and total phosphorus in the oxidation pond could be further reduced by 17.7%and 13.3%.Ecological ditches can effectively intercept nitrogen and phosphorus in water,and have good ecological benefits of purifying water to obtain improved water quality.
文摘为摸清中巴喀喇昆仑公路（简称中巴公路）30年运营对两侧植被的影响范围与程度、公路干扰区域（取弃土场、施工便道等）处植被自然恢复能力，采用样线法和样方法于2009年9月20日～28日、2010年9月8日～15日和2011年9月22日～27日对中巴公路雷克特桥至红其拉甫段（即 K470＋500～K811＋343段）两侧200 m 范围内的各种植被类型及工程占地干扰区域进行了调查和实测。结果显示：公路两侧0～1 m 范围内（即土质边沟处）的物种丰富度、盖度均显著高于99～100 m（自然背景）处，且生物量、多样性指数、优势度指数和均匀度指数均有高于其他距离的趋势；公路路侧干扰样方在外貌、结构组成上已与天然背景样方的植物群落无明显的不同，但植物群落盖度、种类组成、植株高度，随着植被类型的不同与天然群落稍有差别。本研究为正在建设中的中巴公路改扩建工程的生态排水沟建设、植被恢复技术策略（以自然恢复为主、人工恢复为辅）的制定提供了理论依据。
