锡林郭勒羊草草原和针茅草原在不同利用方式下生物量及土壤碳氮特征

发布时间：2018-02-09 00:21

本文关键词： 羊草草原针茅草原打草放牧生物量土壤有机碳土壤全氮　出处：《内蒙古大学》2017年硕士论文　论文类型：学位论文

【摘要】：以锡林郭勒典型草原(羊草草原和大针茅草原)为对象,对其在不同利用方式下(打草利用和放牧利用)地上生物量、地下生物量、土壤有机碳和全氮特征及其相互关系进行了研究。主要结果如下:1.羊草草原,在打草利用方式下,地上生物量的范围在100.37-381.94 g/m2,地下生物量的范围在 1052.24-2907.61 g/m2,地下生物量与地上生物量、土壤有机碳密度、全氮密度和群落盖度存在极显著相关关系;在放牧利用方式下,地上生物量的范围在42.87-108.74 g/m2,地下生物量的范围在801.11-1942.26 g/m2,地下生物量与其他相关因素没有显著相关性。2.针茅草原,打草利用方式下地上生物量的范围在144.35-224.86g/m2,地下生物量的范围在 966.89-1724.27 g/m2,放牧利用方式下地上生物量的范围是85.8-367.34 g/m2。在打草和放牧利用方式下,地下生物量与地上生物量、土壤有机碳密度、全氮密度均无显著相关性。在以打草为主要利用方式下,地下生物量与土壤容重存在显著负相关关系。3.对于2种草原类型,在打草和放牧利用方式下,土壤有机碳密度、全氮密度、碳氮比均呈现垂直分布规律。4.对同一草原类型在不同利用方式下,以及在同一利用方式下不同草原类型,土壤有机碳密度、全氮密度和碳氮比在同一土壤层均具有显著差异性。
[Abstract]:The aboveground biomass and underground biomass of Xilingole typical steppe (Leymus chinensis steppe and Leymus macrophylla L.) were studied under different utilization modes (weeding and grazing). The characteristics of soil organic carbon and total nitrogen and their relationship were studied. The main results are as follows: 1. Leymus chinensis grassland, in the way of weeding, The range of aboveground biomass was 100.37-381.94 g / m ~ (2), and the range of underground biomass was 1052.24-2907.61 g / m ~ (2). There was a significant correlation between underground biomass and aboveground biomass, soil organic carbon density, total nitrogen density and community coverage. The range of aboveground biomass is 42.87-108.74 g / m ~ (2), and the range of underground biomass is 801.11-1942.26 g / m ~ (2). There is no significant correlation between underground biomass and other related factors. The range of aboveground biomass is 144.35-224.86g / m2, the range of underground biomass is 966.89-1724.27 g / m2, and the range of aboveground biomass under grazing is 85.8-367.34 g / m2. There was no significant correlation between soil organic carbon density and total nitrogen density. There was a significant negative correlation between underground biomass and soil bulk density. Soil organic carbon density, total nitrogen density and ratio of carbon to nitrogen all showed vertical distribution. 4. The soil organic carbon density of the same grassland type was different under different utilization patterns and different grassland types under the same utilization mode. Total nitrogen density and C / N ratio were significantly different in the same soil layer.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S812

【参考文献】