不同切根方式和不同梯度氮素添加对内蒙古退化羊草草地的影响

发布时间：2018-05-13 08:30

本文选题：退化羊草草地 + 改良　；参考：《内蒙古大学》2015年硕士论文

【摘要】：为了研究不同切根方式和不同梯度氮素添加组合处理对内蒙古天然中度退化羊草草地的综合改良效果,在内蒙古大学草地生态学研究基地采用二裂式裂区试验设计实施了切根和氮素添加试验,主区处理为两种不同切根方式,裂区处理为不同梯度氮素添加,就不同组合处理对羊草草地的影响作为研究对象进行分析,期望通过本研究拓展和深入探讨切根+施氮肥对退化羊草草原改良的综合效果,以及探求切根和施氮肥对退化羊草草原改良效果的主次关系,寻求退化羊草草地恢复的最佳途径。主要结论如下：1.锡林郭勒典型草原天然中度退化羊草草地经切根和氮素添加组合处理后,条形切根方式和60kg·ha-1氮素添加水平是最佳组合处理,此组合处理使群落地上生物量增加66.49%,羊草种群地上生物量增加99.09%,羊草种群密度增加41.56%,羊草种群高度平均增加19.41%。2.切根和施氮肥组合处理对群落地下生物量产生了影响,除条形切根方式和未添加氮素组合处理外,其他各组合处理均使地下生物量降低,但是随着改良时间的延长,群落地下生物量增加,促进了群落地下生物量的积累。3.不同切根方式和不同梯度氮素添加产生的改良效果的主次关系是不同梯度氮素添加对退化羊草草地的改良效果明显。不同切根方式对退化羊草草地的恢复也起到了调节作用,但是两种切根方式处理的效果差异不明显。不同切根方式和不同梯度氮素添加的交互作用未达到显著水平,即只进行切根处理,30kg·ha-1以上氮素添加水平显著提高群落地上生物量,羊草种群地上生物量,羊草种群密度和羊草种群高度。4、最佳组合处理Q20N4,获得的产量为1544.87kg·ha-1,比对照增加857.39kg·ha-1,按羊草市价每吨600-650元计算,此组合处理增加效益514-577元·ha-1,净收益为244-307元·ha-1。
[Abstract]:In order to study the comprehensive improvement effect of different root cutting methods and different gradient nitrogen addition combinations on natural and moderately degraded sheep grass land in Inner Mongolia. In the grassland ecology research base of Inner Mongolia University, the experiment of cutting root and adding nitrogen was carried out in the two-split zone. The main area was treated with two different ways of root cutting, and the split area was treated with different gradient nitrogen addition. The effects of different combinations on the grassland of Leymus chinensis were analyzed. It was expected that the comprehensive effect of cutting root and applying nitrogen fertilizer on the improvement of degraded Leymus chinensis grassland could be further explored through this study. The primary and secondary relationship between cutting roots and applying nitrogen fertilizer on the improvement of degraded Leymus chinensis grassland was explored, and the best way to restore degraded Leymus chinensis grassland was found. The main conclusions are as follows: 1. After root cutting and nitrogen addition treatment, strip root cutting and 60kg ha-1 nitrogen addition level were the best combinations of natural and moderately degraded sheep grass land in Xilinguole steppe. The aboveground biomass of Leymus chinensis population was increased by 66.49%, the aboveground biomass of Leymus chinensis population increased 99.09%, the population density of Leymus chinensis increased 41.56, and the average height of Leymus chinensis population increased 19.41% .2. The root cutting and nitrogen fertilizer combination treatments had an effect on the underground biomass of the community. Except for the strip cutting and no nitrogen combination treatments, all other combinations reduced the underground biomass, but with the extension of the improvement time, The increase of community underground biomass promoted the accumulation of community underground biomass. The main and secondary relationship between different root cutting methods and different gradient nitrogen addition was that the effect of different gradient nitrogen addition on the improvement of degraded pasture land was obvious. Different root cutting methods also played a regulatory role in the restoration of degraded pasture land, but there was no significant difference between the two methods. The interaction between different root cutting methods and different gradient nitrogen supplementation was not significant, that is, the nitrogen addition level above 30kg ha-1 only increased the aboveground biomass of the community and the aboveground biomass of Leymus chinensis population. The population density of Leymus chinensis and the height of Leymus chinensis population were .4, and the yield of the best combination was 1544.87kg ha-1, which was increased by 857.39kg ha-1 compared with the control. According to the market price of Leymus chinensis, the benefit of this combination was 514-577 yuan, and the net income was 244-307 yuan ha-1.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S812.8

【参考文献】