尼龙网袋捞蚴法检测水体血吸虫尾蚴的研究

目的探索高效、快速检测血吸虫易感地带(点)水体尾蚴,为及时预防人畜感染血吸虫和杀灭尾蚴提供科学依据。方法2008年6～7月份,在岳阳市东洞庭湖垸外易感地带用尼龙网袋捞蚴法和C-6膜粘蚴法检测水体中的血吸虫尾蚴。结果2次试验在同一水体中,尼龙网袋捞蚴法的尾蚴阳性率分别为16.0%和30.0%,尾蚴密度分别为0.2条/0.1m2、和1.7条/0.1m2。C-6膜粘蚴法2次试验的尾蚴阳性率均为3.33%,尾蚴密度分别为0.03条/0.1m2和0.07条/0.1m2。结论尼龙网袋捞蚴法确能高效、快速检测出水体血吸虫尾蚴。

两种还田模式下玉米秸秆分解速率的比较

Tests of the whole maize straw incorporation and the smashed ones were conducted on tideland of semi-arid area of Quzhou, Hebei Province.The tests are composed of seven different treatments.By one year’s period of test, it indicates that the process of decomposition of straw in the field is divided into three stages.In the early stage,the decomposition rate of the smashed straw is faster than that of the whole in the field.But the gap between the two rates is diminished after wheat turns green.The coefficient of huminification is not affected by the measures of adding use of nitrogenous fertilizer,spraying EM and so on.

冀西北栗钙土有机质分解及土壤速效养分变化的研究

采用尼龙网袋法研究栗钙土有机质分解及土壤速效养分的变化结果表明,不同有机物(肥)料在前3个月分解较快,最初30d坡梁栗钙土和旱滩草甸栗钙土分解率分别为32.68％和30.32％。新施入有机物(肥)料可明显提高土壤有机质活性系数,平均提高16％左右,腐殖质活性顺序依次为牛粪>莜麦秸>豌豆秸。有机物(肥)料腐解周年后土壤有机碳及速效氮、速效磷、速效钾明显增加。2类土壤有机碳分别为106.67％～135.00％和53.33％～58.18％,速效氮、速效磷、速效钾分别提高34.62％～52.31％和21.10％～50.37％、18.20％～207.60％和34.20％～210.05％、64.92％～143.12％和28.75％～102.49％。