摘要
以西藏高寒色林错湿地为研究对象,对重度践踏型（ZM）、轻度扰动型（QM）以及长期禁牧（CK）影响下草甸土壤容重、表面紧实度及其碳、氮空间分布进行了研究。结果表明：1土壤容重随土层深度的增加呈增加的趋势。不同放牧对表层（0~20 cm）土壤容重和土壤紧实度的影响均存在显著差异,其中ZM〉CK〉QM。随着土层深度（20~40 cm）的增加,这种影响差异不断减小至无差异。2不同放牧干扰下,土壤总有机碳（SOC）含量和土壤全氮（TN）含量随土层深度的增加呈现逐渐减少的趋势。但不同放牧干扰下,表层（0~20 cm）土壤SOC和TN含量存在显著差异,其中CK〉ZM〉QM。随着土层深度（20~40 cm）的增加,不同放牧干扰对土壤SOC和TN含量的影响不存在显著差异。研究表明,放牧对湿地表层土壤（0~20 cm）物理性状及其碳、氮营养物质积累存在显著影响,不同放牧对其影响存在差异,进而对湿地生态系统＂汇＂功能产生影响。
Selincuo alpine wetland was taken as study site,heavy grazing（ZM）,mild disturbance grazing（QM） and long time grazing prohibition（CK） area were chosen as treatments,soil bulk density,surface soil compaction and spatial distribution of carbon and nitrogen were studied. The results showed that ： 1soil bulk density increased with the soil depth. There were significant differences among different grazing on soil bulk density and surface soil compaction at the layer of 0 ~20 cm in the sequence of ZMCKQM. With the increase of soil depth（20~40 cm）,this difference continuously decreased till to no difference. 2Soil organic carbon and soil total nitrogen decreased with the increase of soil depth in different grazing. There were significant differences among different grazing on soil organic carbon and total nitrogen at the layer of 0 ~20 cm in the sequence of CKZMQM. With the increase of soil depth（20~40 cm）,there were no significant differences. The results indicated that grazing produced obvious impact on soil physical properties and the accumulation of carbon and nitrogen in meadow wetland within soil layer of 0~20 cm. The effects of different grazing treatments varied.
出处
《湖北农业科学》
2016年第18期4660-4663,共4页
Hubei Agricultural Sciences
基金
国家自然科学基金项目(41261073)
西藏大学农牧学院青年骨干教师支持计划项目
关键词
西藏高寒湿地
放牧
土壤容重
土壤碳氮
Tibet alpine wetland
grazing
soil bulk density
carbon and nitrogen in soil
