Straw management effects on organic matter mineralization and salinity in semiarid agricultural soils

被引:24
作者
Badía, D [1 ]
机构
[1] Escuela Univ Politecnia, Area Prod Vegetal, Huesca 22071, Spain
来源
ARID SOIL RESEARCH AND REHABILITATION | 2000年 / 14卷 / 02期
关键词
straw amendment; soil respiration; salt-affected soils; seasonal dynamics; Ebro Valley;
D O I
10.1080/089030600263111
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The impact of straw incorporation (6 Mg ha(-1) year(-1)) into agricultural soils compared with straw removal on organic matter mineralization and salinity was studied. The mineralization coefficient (CO2-C evolved/organic C ratio) was obtained to evaluate organic matter mineralization. Soil salinity was measured as means of electrolytic conductivity of saturation paste extract. Both parameters were measured seasonally during two years in two salt-affected soils of the semiarid Central Ebro Valley (northeast Spain), a saline soil and a saline-sodic soil. The electrolytic conductivity (ranging from 2.5 dS m(-1) to 24.3 dS m(-1)) and the mineralization coefficient (ranging from 5.9 10(-4) day(-1) to 37.9 10(-4) day(-1)) varied widely during seasonal samplings of both soils. The lowest electrolytic conductivity values, coincided with the highest mineralization coefficient values. Straw mulching and burying decreased significantly the average seasonal electrolytic conductivity of both soils: 2.5 times in the saline soil and 1.9 times in the saline-sodic soil. The EC reduction only increased significantly (P < 0.05) the mineralization coefficient on saline soil (1.6 times). Straw amendment, followed by rainy periods, allowed the soluble salts leaching but did not modify significantly sodium content. A logarithmic regression fit was found between mineralization coefficient and electrolytic conductivity (r(2) = 0.41), considering both soils. Infiltration, water aggregate stability, and qCO(2) were improved with the straw amendment, but only in saline soil. Soil differences showed the existence of a double effect: an osmotic and a specific ion effect.
引用
收藏
页码:193 / 203
页数:11
相关论文
共 46 条
[1]  
AMBROGIONI L, 1987, Redia, V70, P21
[2]  
AMEZQUETA E, 1990, ANAL EDAFOLOGIA AGRO, V49, P765
[3]  
ANDERSON TH, 1991, ADVANCES IN SOIL ORGANIC MATTER RESEARCH : THE IMPACT ON AGRICULTURE AND THE ENVIRONMENT, V90, P253
[4]   APPLICATION OF ECOPHYSIOLOGICAL QUOTIENTS (QCO2 AND QD) ON MICROBIAL BIOMASSES FROM SOILS OF DIFFERENT CROPPING HISTORIES [J].
ANDERSON, TH ;
DOMSCH, KH .
SOIL BIOLOGY & BIOCHEMISTRY, 1990, 22 (02) :251-255
[5]  
Arcara P. G., 1982, Annali dell' Istituto Sperimentale per lo Studio e la Difesa del Suolo, Firenze, V13, P137
[6]  
Badia D., 1997, Agricoltura Mediterranea, V127, P352
[7]  
BADIA D, 1994, GEOMICROBIOL J, V11, P261
[8]   EXCHANGEABLE CATION ANALYSIS OF SALINE AND ALKALI SOILS [J].
BOWER, CA ;
REITEMEIER, RF ;
FIREMAN, M .
SOIL SCIENCE, 1952, 73 (04) :251-261
[9]  
Cadish G., 1997, DRIVEN NATURE PLANT
[10]  
DOMMERGUES Y., 1960, Agron. trop., V15, P54