草业学报2026，Vol.35Issue(4)：42-53,12.DOI:10.11686/cyxb2025269
环青海湖地区牦牛和藏羊粪便夏季分解对土壤养分的影响
Effects of summer decomposition of yak and Xizang sheep dung on soil nutrients in the Peri-Qinghai Lake Region
摘要
Abstract
Yaks and Xizang sheep are the primary grazing livestock on the Qinghai-Tibet Plateau.The decomposition of their dung exerts a direct effect on alpine grassland ecosystems,yet the mechanisms and differences in how these two types of dung affect soil nutrients remain poorly understood.In this study,the nylon mesh bag method was used to monitor nutrient release dynamics from fresh yak and Xizang sheep dung of equal dry weight.A concentric-circle stratified sampling approach was employed to investigate the migration and enrichment patterns of nutrients released from dung decomposition along the vertical(below-dung)and horizontal(around-dung)directions in the soil.The results indicated that:1)The total carbon(TC),total nitrogen(TN),and total phosphorus(TP)contents in fresh yak and Xizang sheep dung were 333.39 and 311.41 g·kg-1,22.25 and 15.51 g·kg-1,and 6.95 and 7.47 g·kg-1,respectively;2)After 45 days of natural decomposition,the losses in dry matter,TC,TN,and TP were 28.58％and 12.82％,23.68％and 17.85％,9.35％and 15.54％,and 22.45％and 30.21％for yak and Xizang sheep dung,respectively;3)On the 45th day of decomposition,the soil TC content reached its peak under both dung treatments.The TP content in the soil around Xizang sheep dung was slightly higher than that around yak dung,while the TN content beneath and around yak dung was higher than that in the Xizang sheep dung treatment;4)The enrichment rate for TC beneath Xizang sheep dung was significantly higher than that beneath yak dung after 45 days of decomposition,but no significant differences were detected in the TN enrichment rates between the two types of dung in either the below-dung or around-dung soil sampling.In summary,fresh yak dung contained higher TC and TN than Xizang sheep dung,decomposed more rapidly,and released nitrogen more strongly.In contrast,Xizang sheep dung facilitated more sustained soil carbon enrichment.Both types of dung promoted phosphorus accumulation,and nutrient migration was more pronounced in the vertical direction than in the horizontal direction.关键词
高寒草地/牦牛/藏羊/粪便分解/土壤养分/养分富集Key words
alpine grassland/yak/Xizang sheep/dung decomposition/soil nutrients/nutrient enrichment引用本文复制引用
李梦棋,董全民,孙彩彩,吕卫东,许蔚,刘玉祯,刘文亭,杨晓霞..环青海湖地区牦牛和藏羊粪便夏季分解对土壤养分的影响[J].草业学报,2026,35(4):42-53,12.基金项目
环青海湖高寒草地土壤线虫和节肢动物群落多样性和土壤功能对放牧强度的响应机制(2025-ZJ-942M)资助. （2025-ZJ-942M）
