摘要
研究了结缕草放牧草地根系层土壤氮素的季节性变化特征.结果表明:结缕草放牧草地根系层土壤的全氮量和C/N比值的变化与草地土壤总的肥力水平有关,同时也受到草地放牧的强度和历史的影响;但无机态氮(硝态氮和铵态氮)却较少受到这些因素的影响;铵态氮在根系层土壤的无机态氮总量中占优势.在所研究的放牧草地上,放牧牛在前一年排泄的粪斑对下一个生长季根系层土壤氮素水平的影响很小,因此,由粪斑引起的结缕草放牧草地根系层土壤氮素的空间异质性持续时间一般可能不会超过两个生长季.
Nitrogen variations in root-layer soils of Zoysia japonica pasture were studied. The results showed that the variations of soil total N and C/N ratio were related to the general fertility levels in the pasture soils, and were also affected by the intensity and history of grazing on the pastures. However, inorganic N, including nitrate N and ammonium N, was affected a little by these factors. The form of ammonium N dominated over the inorganic N in the root-layer soils. In the pasture soils, the dung pats defecated in the previous year weakly influenced the soil nitrogen levels in the root-layers of the next growing season. Therefore, the duration of the spatial heterogeneity of soil nitrogen in root-layers induced by cattle dung usually might not exceed two growing seasons. Tab 1, Ref 10
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2005年第3期312-314,共3页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金资助项目(No.30370245
No.30470288)
上海市生态学重点学科项目
华东师范大学211工程项目资助~~
关键词
氮素
放牧
结缕草
土壤
异质性
粪斑
nitrogen
grazing
Zoysia japonica Steud.
soil
heterogeneity
dung pat
