期刊
JOURNAL OF ARID ENVIRONMENTS
卷 54, 期 2, 页码 327-343出版社
ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
DOI: 10.1006/jare.2002.1091
关键词
soil organic carbon; soil organic nitrogen; rainfall gradient; land-use gradient; Kalahari; savanna; Botswana
We examined relationships between vegetation and soil nutrients along rainfall and land use gradients in the Kalahari. Soil organic carbon (SOC) was significantly lower where reduced rainfall and grazing lowered litter inputs to, the soil. Soil organic nitrogen (SON) was significantly lower at the driest site and was higher than expected at two grazed sites. Ammonium levels at Mongu (wettest) were significantly higher, while nitrate was lower than expected everywhere. Site-averaged concentrations showed no significant differences in SOC and SON beneath plant canopies, but woody plant canopies alone showed elevated SOC at three sites and SON at one site. (C) 2003 Elsevier Science Ltd.
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