共 20 条
[11]
土壤理化分析[M]. 上海科学技术出版社 , 中国科学院南京土壤研究所 编, 1978
[15]
Carbon dioxide fluxes over a northern, semiarid, mixed-grass prairie[J] . A.B Frank,W.A Dugas.Agricultural and Forest Meteorology . 2001 (4)
[16]
BIOGEOCHEMISTRY IN A SHORTGRASS LANDSCAPE: CONTROL BY TOPOGRAPHY, SOIL TEXTURE, AND MICROCLIMATE[J] . Paul B. Hook,Ingrid C. Burke.Ecology . 2000 (10)
[17]
An investigation of the influence of human disturbance on selected soil nutrients in Narok District, Kenya[J] . Z. A. Ogutu.Environmental Monitoring and Assessment . 1999 (1)