围封年限对荒漠草原土壤有机碳、全氮、全磷与微生物量碳、氮等的影响

发布时间：2018-06-19 08:15

本文选题：土壤 + 微生物　；参考：《江苏农业科学》2017年16期

【摘要】：以宁夏境内荒漠草原为研究对象,通过对比分析未围封与围封5、8、12、15年样地土壤有机碳、全氮、全磷含量以及土壤微生物量碳、氮含量与土壤酶活性的变化过程与规律,分析荒漠草原不同围封年限对土壤与土壤微生物的影响。结果表明,荒漠草原采取围封措施以后,土壤的有机碳含量、全氮含量和全磷含量均高于未围封样地,且随着围封时间的变化表现出相似的变化规律,即围封12年时含量最高,之后含量出现降低的趋势。0~10 cm和10~20 cm土层中,土壤碳氮比(C/N)与碳磷比(C/P)规律相同,均表现为先减小后增大。土壤氮磷比(N/P)则在各层土壤中表现出与土壤C/N值、C/P值相似的变化趋势。土壤微生物量碳和微生物量氮含量均高于未围封样地。由结果可知,在荒漠草原采取围封措施可以促进土壤微生物的活动,从而提高微生物量。同时,土壤微生物量C/N值随围封时间的延长先增大后减小。
[Abstract]:Taking the desert steppe in Ningxia as the research object, the change process and regularity of soil organic carbon, total nitrogen, total phosphorus, microbial biomass carbon, nitrogen content and soil enzyme activity in the unenclosed and enclosed desert steppe for 15 years were analyzed by comparing the changes of soil organic carbon, total nitrogen, total phosphorus, soil microbial biomass carbon, nitrogen content and soil enzyme activity. The effects of different enclosing years on soil and soil microorganisms in desert steppe were analyzed. The results showed that the contents of organic carbon, total nitrogen and total phosphorus in desert steppe were higher than those in unenclosed sample plots after enclosure measures were adopted, and the contents of soil organic carbon, total nitrogen and total phosphorus were the highest in 12 years of enclosure with the change of encapsulation time, and the contents of organic carbon, total nitrogen and total phosphorus in desert steppe were higher than those in unenclosed sample plots. In the soil layer of 10 cm and 10 ~ 20 cm, the C / N ratio (C / N) and C / P ratio (C / N) were the same as those in C / P ratio, and the C / N ratio decreased first and then increased. The ratio of N / P to N / P was similar to that of C / N and C / P in each layer of soil. Soil microbial biomass carbon and microbial biomass nitrogen content were higher than that of unenclosed plots. According to the results, the enclosed measures in desert steppe can promote the activity of soil microorganism and improve microbial biomass. At the same time, the C / N value of soil microbial biomass increased firstly and then decreased with the increase of encapsulation time.
【作者单位】：宁夏大学西北退化生态系统恢复与重建教育部重点实验室;宁夏大学农学院;
【基金】：国家自然科学基金(编号:31660168)
【分类号】：S812.2

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