摘要
对稻鸭萍共作体系的主要生态效应研究结果表明,稻鸭萍共作有利于提高土壤肥力,水稻收获后的土壤有机质、碱解氮、速效磷、速效钾分别比对照增加7.95%、7.05%、6.47%和4.46%;稻鸭萍共作对杂草的控制效果达到98.94%,明显削弱了稻田优势杂草的发生与危害,稻田残存杂草为数甚少,P ielou均匀度指数显著提高;稻鸭萍共作对稻田飞虱有显著的控制效应,从而明显抑制主要由灰飞虱传毒危害的水稻条纹叶枯病的发病率;稻鸭萍共作虽然对水稻纹枯病也有明显防治效果,但不能阻止纹枯病的发生;由于绿萍吸附了稻田水体中部分有机物、腐殖质等,稻鸭萍共作区水体的化学需氧量比稻鸭共作区降低8.70%。
Main eco-effects of the rice-duck-azolla compound system were studied. Results show that the system improved soil fertility by increasing organic matter, available N, P and K by 7.95 %, 7.05 %, 6.47% and 4.46%, respectively, over CK. Besides, it controlled weeds by 98.94%, and reduced significantly infestation of former dominant species of weeds in the paddy fields. As a result, fewer weeds survived and Pielou evenness index rose sharply. It was also quite effective in controlling planthoppers,thus obviously suppressing incidence of rice stripe disease that is spread through planthoppers. Though the system also showed significant effect on controlling of rice sheath blight,it couldn＇t put an end to incidence of the disease. As azolla absorbed some organic substances and humus from the water, the rice-duck-azolla system was 8.70% lower than the rice-duck system in COD of the submerging water. Thus the water in the former was more transparent.
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2006年第3期11-14,共4页
Journal of Ecology and Rural Environment
基金
江苏省农业科技项目(BC2005312)
江苏省环保科技项目(2004019)
国家科技攻关重大项目(2002BA516A14
2001BA508B)
国家高技术研究发展计划项目(2001AA245041)
关键词
稻鸭萍共作
复合系统
生态效应
土壤肥力
杂草
病虫害
稻田水质
rice-duck-azolla system
compound system
ecological effect
soil fertility
weed
disease and insect pest
water quality of rice field
