不同时期放牧对典型草原群落生产力的影响

发布时间：2018-05-21 05:40

本文选题：典型草原 + 群落生产力　；参考：《内蒙古大学》2015年硕士论文

【摘要】：2013-2014年,基于草地适应性利用理念,于内蒙古锡林郭勒盟西乌珠穆沁旗,在牧户尺度下,以生长季,不同起始放牧时间牧后牧草留茬高度为9±1 cm为终牧时间节点的轮牧利用中,研究了季节尺度不同放牧时期对内蒙古典型草原区群落生产力及土壤有机质含量的影响。得出以下结论：1.以群落净初级生产力及羊群采食量为指标,则2区(6月、8月放牧)群落地上净生产力与采食量显著高于其它小区,说明这种轮牧时间的搭配为较好的牧草资源利用方式。2.就草地利用率而言,2013、2014两年草地利用率为都以4区最高、其次为2区,均在55%以上。3.不同再生长期内群落增长速率以2区(放牧间期主要为7月)最高。此外,4个小区再生长期群落增长速率均为正值,能够补偿第一次轮牧中羊群对牧草的啃食量。就2014年研究而言,整个放牧季不同时期的轮牧利用对典型草原植物群落表现为等补偿生长。4.各个小区根系生物量均随着土层的加深逐渐减少,且地下根系主要集中在0-20cm土层,表现出表层化的趋势。1区地下根系生物量显著低于其他小区,而其他不同处理间没有显著差异。5.各处理地下生物量垂直变化各异,可大致分为两类：浅层增加深层减少型(1、3小区)及浅层减少深层增加型(2、4小区)。6.土壤有机质含量以4区最多,其含量显著高于其他三个小区,尤其在0-5 cm土层中较明显；在不同小区,土壤有机质都随着土层的加深逐渐减少,主要集中在土壤表层。
[Abstract]:In the 2013-2014 year, based on the concept of grassland adaptation utilization, in Inner Mongolia Xilinguole Meng Xi Wu Zhu Mu Qin flag, in the herdsman scale, in the growing season, the height of the stubble stubble of pasture was 9 + 1 cm as the final grazing time in the growing season. The following conclusions are drawn as follows: 1. the net primary productivity and the herd feed intake of the community are the indexes, and the net productivity and feed intake of the 2 area (June, August grazing) group are significantly higher than those of the other communities. It is suggested that the matching of the rotation time of this kind of grazing is the better use of pasture resources.2. for the utilization of grassland. In 20132014 years, the utilization rate of grassland was the highest in 4 areas, followed by the 2 region, and the growth rate of the community in a long period of 2 (mainly in July) was the highest in the different regeneration period of more than 55%.3.. In addition, the growth rate of the regenerated long-term community of the 4 plots was positive, which could compensate for the grazing of the herd in the first round of grazing. For the whole grazing season, the rotation of the pasture in different periods showed the same compensatory growth for the typical steppe plant community. The root biomass of each cell in the.4. area decreased gradually with the soil layer deepened, and the underground root system mainly concentrated in the 0-20cm soil layer, showing the trend of the surface layer in the.1 area, the underground root biomass was significantly lower than that of the other communities. There was no significant difference between different treatments in different treatments of.5., which could be divided into two types, which were roughly divided into two types: the increase of the shallow layer and the deep decrease in the shallow layer (1,3 area) and the deep layer of the shallow layer (2,4 District), the content of organic matter in the.6. soil was the most, and the content was significantly higher than that of the other three plots, especially in the 0-5 cm soil layer. In different plots, soil organic matter gradually decreased with the deepening of soil layer, mainly concentrated on the surface of the soil.
【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

【参考文献】