The influence of Acacia tortilis (Forssk.) Subsp raddiana (Savi) and livestock grazing on grass species composition, yield and soil nutrients in and environments of South Tunisia

被引:52
作者
Abdallah, Fathia [1 ]
Noumi, Zouhaier [1 ]
Touzard, Blaise [2 ]
Belgacem, Azaiez Ouled [3 ]
Neffati, Mohamed [3 ]
Chaieb, Mohamed [1 ]
机构
[1] Univ Sfax, Fac Sci, Lab Biol & Ecophysiol, Sfax, Tunisia
[2] Univ Bordeaux 1, BioGeCo, Lab Ecol Commun, CNRS,UMR 1202, F-33405 Talence, France
[3] Inst Reg Arides Medenine, Tunis, Tunisia
关键词
tree canopies; open areas; grass composition; yield; soil enrichment; facilitation;
D O I
10.1016/j.flora.2007.02.002
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The objectives of the study, conducted during the 2003/2004 growing season in the National Park of Bou Hedma (South Tunisia), were to quantify the effects of the single-woody species Acacia tortilis subsp. raddiana on grass species composition, on total plant cover, on density of perennial species, on dry matter (DM) yield and on soil nutrients at lightly and heavily grazed sites. In each study site, two subhabitats were distinguished, i.e. under tree canopies and open grasslands. In the lightly grazed site, the nutrient status of soil (organic matter, total N, extractable P, K+, Ca2+, Na+, Mg2+) under Acacia raddiana canopy, was found to be significantly higher (p < 0.05) than under the open grassland. In the same way, total plant cover (p < 0.05), density of perennial species (p < 0.01) and DM yield (p < 0.01) were significantly higher under tree canopies in the lightly grazed site. Heavy grazing proved to exert a strong overriding effect over the positive influences of the woody plants. For most studied parameters, a non-significant difference was recorded between canopied and uncanopied subhabitats. Some palatable species were frequently found under trees. In the heavily grazed site, these species are being replaced by less desirable species. This emphasizes the importance of conservation stocking rates and proper pasture management. (C) 2007 Elsevier GmbH. All rights reserved.
引用
收藏
页码:116 / 125
页数:10
相关论文
共 41 条
[11]   Savanna trees in Namibia - Factors controlling their distribution at the arid end of the spectrum [J].
Burke, Antje .
FLORA, 2006, 201 (03) :189-201
[12]   FACILITATION AND INTERFERENCE OF QUERCUS-DOUGLASII ON UNDERSTORY PRODUCTIVITY IN CENTRAL CALIFORNIA [J].
CALLAWAY, RM ;
NADKARNI, NM ;
MAHALL, BE .
ECOLOGY, 1991, 72 (04) :1484-1499
[13]  
Callaway RM, 1999, PEOPLE AND RANGELANDS BUILDING THE FUTURE, VOLS 1 AND 2, P197
[14]  
CHRISTIE EK, 1975, TROP GRASSLANDS, V19, P243
[15]  
DAGET P, 1971, ANN AGRON, V22, P5
[16]  
DAVID JE, 2005, PLANT SOIL, V270, P331
[17]   Comparative growth, biomass production, nutrient use and soil amelioration by nitrogen-fixing tree species in semi-arid Senegal [J].
Deans, JD ;
Diagne, O ;
Nizinski, J ;
Lindley, DK ;
Seck, M ;
Ingleby, K ;
Munro, RC .
FOREST ECOLOGY AND MANAGEMENT, 2003, 176 (1-3) :253-264
[18]  
Diouf M., 2003, ARBRE DESERT ACACIA, P103
[19]   POSITION OF MESQUITE (PROSOPIS SPP) NODULATION AND NITROGEN-FIXATION (ACETYLENE-REDUCTION) IN 3-M LONG PHRAETOPHYTICALLY SIMULATED SOIL COLUMNS [J].
FELKER, P ;
CLARK, PR .
PLANT AND SOIL, 1982, 64 (03) :297-305
[20]   CLIMATIC ARIDITY, EDAPHIC ARIDITY [J].
FLORET, C ;
PONTANIER, R .
BULLETIN DE LA SOCIETE BOTANIQUE DE FRANCE-ACTUALITES BOTANIQUES, 1984, 131 (2-4) :265-275