河北坝上农牧交错带草地不同方式持续利用对土壤颗粒空间分布的影响

发布时间：2018-06-24 02:16

本文选题：放牧草地 + 放牧强度　；参考：《草地学报》2016年03期

【摘要】：为探究河北坝上农牧交错带典型草原不同方式持续利用对土壤颗粒空间分布状况的影响,本研究通过对河北坝上封育10年,中度放牧,重度放牧草地以及不同开垦年限的垦殖草地(持续利用5年,10年,15年)土壤进行分层(0~10cm,10~20cm,20~40cm,40~60cm)研究其土壤颗粒分布及变化。结果表明:随放牧强度的增加,土壤中2000~250μm,250~150μm,150~53μm颗粒含量均显著减少,而53~20μm,20~2μm,2μm颗粒含量均显著增加,即增加了重度放牧草地土壤风蚀退化的潜在危险性;对于垦殖草地,随着持续利用年限的增加,土壤中2000~250μm,250~150μm,150~53μm颗粒含量均显著增加,而53~20μm,20~2μm,2μm颗粒含量均显著减少,这表明随着垦殖年限的增加,土壤逐渐趋向沙化。因此,为保证草地的可持续性,放牧草地需要避免重度放牧而垦殖草地需要改变现有的耕作方式。
[Abstract]:In order to investigate the effects of different ways of sustainable utilization on the spatial distribution of soil particles in typical grasslands in the ecotone of agriculture and animal husbandry in Bashang, Hebei Province, this study was carried out through 10 years of fencing and moderate grazing in Bashang, Hebei Province. Heavy grazing grassland and cultivated grassland with different reclamation years (5 years, 10 years and 15 years) were used to study the distribution and change of soil particles in different layers (0 ~ 10 cm ~ (10) ~ (10) ~ (20) cm ~ (20) ~ (20) cm ~ (-1) ~ (20) ~ (20) ~ (40) cm ~ (-1) ~ 4060 cm). The results showed that with the increase of grazing intensity, the particle contents of the soil (2000 ~ 250 渭 m, 250 渭 m, 150 渭 m, 53 渭 m) decreased significantly, while the 53 ~ 20 渭 m, 20 渭 m, 2 渭 m, which increased the potential risk of soil wind erosion degradation, With the increase of the duration of sustainable utilization, the particle contents of the soil (2000 ~ 250 渭 m, 150 渭 m, 53 渭 m) were significantly increased, while the content of 5320 渭 m, 20 渭 m, 2 渭 m, decreased significantly, which indicated that with the increase of the reclamation years, the soil gradually tended to be desertified. Therefore, in order to ensure the sustainability of grassland, grazing grassland needs to avoid heavy grazing, and reclamation grassland needs to change the existing farming methods.
【作者单位】：中国农业大学动物科技学院草业科学系;中国农业大学资源与环境学院;河北沽源草地生态系统国家野外科学观测研究站;
【基金】：中央高校基本科研业务费专项资金(2012RC025;2014JD024) 国家科技支撑计划(2012BAD45B03;2012BAD13B07)资助
【分类号】：S812

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