短花针茅草原主要植物种群与土壤养分对季节调控放牧的响应

试验以短花针茅荒漠草原为研究对象,共设4个试验处理区,进行植物养分与不同土壤土层养分含量变化的研究。结果显示:短花针茅的高度在轻度放牧SA1区、适度放牧SA5区、零放牧CK区显著高于重度放牧SA3区(P<0.05),植物种群的高度SA1区短花针茅最高,植物种群盖度影响最大的植物是碱韭,放牧区与对照组对比差异显著(P<0.05);植物群落的全氮含量在SA1区内最低,植物群落的碳含量在SA1区内最小,CK区次之;N/P数值大小依次为SA5>SA3>CK>SA1;放牧减少了土壤速磷含量,增加了土壤表层土的有机碳。

Responses of Main Plant Populations and Soil Nutrients in Stipa breviflora Steppe to Seasonally Regulated Grazing

In this study,four experimental treatment areas were set up to assess the changing characteristics in plant nutrients and soil nutrients of different layers using Stipa breviflora desert steppe as the research object.The results showed that the height of Stipa breviflora in light-grazing area SA1,moderate-grazing area SA5 and zero-grazing area CK was significantly(P<0.05)higher than that in over-grazing area SA3.The height of plant population in SA1 area was the highest.The plant with the greatest influence on coverage of plant population was Allium polyrhizum,and significant(P<0.05)difference between the grazing areas and CK was observed.SA1 area had the lowest total nitrogen content of plant community,and the lowest carbon content of plant community was also observed in SA1 area followed by CK.The order of N/P value was SA5>SA3>CK>SA1.Grazing reduced the content of fast phosphorus in the soil and increased the organic carbon in the surface soil.