祁连山高寒草原醉马草防除后优良牧草补播的土草效应
发布时间：2019-02-22 09:23
【摘要】：本研究以我国北方天然草地毒草醉马草(Achnatherum inebrians)为研究对象,在甘肃省肃南县大河乡公路两侧对其种群数量较大的区域开展了草甘磷和重耙对比灭杀试验;在此基础上,采用随机区组试验设计,选择补播的优良牧草种类,总结了草地补播改良效果以及技术。结果表明,10%草甘磷防除效果超过98%,推荐使用剂量150~190g·667m~(-2)为宜;重耙灭杀醉马草防除效果超过90%,推荐重耙措施为30cm深度为宜。退化草地补播改良结果表明,浅翻耕条播、浅翻耕撒播、行内松土补播牧草的组合Ⅴ[垂穗披碱草(Elymus nutans)1kg·667m~(-2)+紫羊茅(Festuca rubra)0.5kg·667 m~(-2)+草地早熟禾(Poa pratensis)0.3kg·667 m~(-2)+小冠花(Coronilla varia)0.2kg·667m~(-2)]和组合Ⅵ[垂穗披碱草1kg·667m~(-2)+紫羊茅0.5kg·667m~(-2)+草地早熟禾0.2kg·667m~(-2)+小冠花0.3kg·667m~(-2)]的成活率分别为85%和73%,91%和87%,87%和75%,表现出较强的适应性。退化草地牧草补播的最适宜播种深度为1~4cm,当播种深度为0和4~8cm时,出苗率和成活率均较低。与不动土撒播相比,浅翻耕条播、行内松土补播牧草的组合Ⅴ和Ⅵ可有效改善土壤养分状况,使补播牧草高度、密度及生物量显著增加,可以在天然退化草地的生态恢复中推广应用。
[Abstract]:In this study, (Achnatherum inebrians), a natural grass in natural grassland of North China, was used as the research object, and a comparative killing experiment was carried out on the two sides of Dahe Township Highway in Sunan County, Gansu Province, in which the population quantity was relatively large. On the basis of this, a random block experiment design was used to select the fine forage species for supplementary sowing, and the improvement effect and technique of supplementary sowing on grassland were summarized. The results showed that the control effect of 10% triglyceride was more than 98%, the recommended dosage was 150g 190g 667m-2, the control effect of heavy rake was more than 90%, and the 30cm depth was recommended. The results of supplementary sowing improvement of degraded grassland show that the cultivation of sowls is shallow, and the sowing of sowls with shallow tillage is better than that of sowls. Studies on the combination of forage sown with loose soil in the row 鈪，
本文编号：2428075
[Abstract]:In this study, (Achnatherum inebrians), a natural grass in natural grassland of North China, was used as the research object, and a comparative killing experiment was carried out on the two sides of Dahe Township Highway in Sunan County, Gansu Province, in which the population quantity was relatively large. On the basis of this, a random block experiment design was used to select the fine forage species for supplementary sowing, and the improvement effect and technique of supplementary sowing on grassland were summarized. The results showed that the control effect of 10% triglyceride was more than 98%, the recommended dosage was 150g 190g 667m-2, the control effect of heavy rake was more than 90%, and the 30cm depth was recommended. The results of supplementary sowing improvement of degraded grassland show that the cultivation of sowls is shallow, and the sowing of sowls with shallow tillage is better than that of sowls. Studies on the combination of forage sown with loose soil in the row 鈪，
本文编号：2428075
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