Stemflow contribution to the ‘fertile island’ effect in creosotebush,Larrea tridentata☆

Abstract Stemflow, throughfall and bulk precipitation were collected on six creosotebushes ( Larrea tridentata ) during 18 events in the summer rainy season in the northern Chihuahuan Desert. The average stemflow was 16·8 ± 1·9%; throughfall averaged 64·7 ±3·2%. The concentration of all ions measured were significantly higher in stemflow than in the bulk precipitation. Total nitrogen, sulfate, and calcium concentrations were more than an order of magnitude higher in the stemflow than in the bulk precipitation. Concentration of ions in the upper 10 cm of soil were generally higher in soils under shrubs than in soils between shrubs. Measured quantities of ions in dry-fall were of sufficient magnitude to account for the increased concentration in stemflow water of most ions. Increases in nitrogen in stemflow water may be due to biological activity of stem crust micro-organisms in addition to dry-fall. Dry-fall that collects on the leaves and stems of this desert shrub may contribute to the ‘fertile island’ effect on the soils under the canopies of creosotebushes.

[1]  N. West,et al.  Plant-Induced Soil Chemical Patterns in Some Shrub-Dominated Semi-Desert Ecosystems of Utah , 1975 .

[2]  R. C. Barth,et al.  Amount and Distribution of Dry Matter, Nit- rogen, and Organic Carbon in Soil-Plant Systems of Mesquite and Palo Verde , 1982 .

[3]  L. A. Richards.  Diagnosis and Improvement of Saline and Alkali Soils , 1954 .

[4]  C. Mckell,et al.  Contribution of Shrubs to the Nitrogen Economy of a Desert‐Wash Plant Community , 1970 .

[5]  R. Bryan,et al.  Interception loss and rainfall redistribution by three semi-arid growing shrubs in northeastern Mexico , 1990 .

[6]  W. Whitford,et al.  Stemflow, throughfall and channelization of stemflow by roots in three Chihuahuan desert shrubs , 1996 .

[7]  N. West,et al.  Micro-patterns of nitrogen mineralization activity in soils of some shrub-dominated semi-desert ecosystems of Utah , 1977 .

[8]  G. Parker.  Throughfall and Stemflow in the Forest Nutrient Cycle , 1983 .

[9]  A. Page.  Methods of soil analysis. Part 2. Chemical and microbiological properties. , 1982 .

[10]  W. Jarrell,et al.  Soil Properties in a Mesquite‐Dominated Sonoran Desert Ecosystem , 1983 .

[11]  N. West,et al.  Nitrogen in Desert Ecosystems , 1978 .

[12]  W. Schlesinger.  Community Structure, Dynamics and Nutrient Cycling in the Okefenokee Cypress Swamp-Forest , 1978 .

[13]  Gene E. Likens,et al.  Throughfall and Stemflow Chemistry in a Northern Hardwood Forest , 1973 .

[14]  P. Steudler,et al.  Determination of total nitrogen in aqueous samples using persulfate digestion1 , 1977 .

[15]  H. Fowler,et al.  The effects of subterranean termite removal on desert soil nitrogen and ephemeral flora , 1982 .

[16]  A. Pressland.  Rainfall Partitioning by an Arid Woodland (Acacia aneura F. Muell.) In South-Western Queensland , 1973 .

[17]  R. Nulsen,et al.  The fate of rainfall in a mallee and heath vegetated catchment in southern Western Australia , 1986 .