Soil organic matter changes in intensively cropped dryland systems

被引:130
作者
Bowman, RA [1 ]
Vigil, MF [1 ]
Nielsen, DC [1 ]
Anderson, RL [1 ]
机构
[1] USDA ARS, Akron, CO 80720 USA
关键词
D O I
10.2136/sssaj1999.03615995006300010026x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Continuous cropping or decreasing the frequency of summer fallow (F) in cereal based dryland rotations may have benefits other than greater water utilization and erosion control. We hypothesized that rotations with no fallow or minimum fallow frequency can produce more biomass and cover than the traditional winter wheat (Triticum aestivum L.)-summer fallow systems (W-F), and ultimately, greater amounts of soil organic matter (SOM). To this end, we evaluated changes in various poets of SOM at the 0 to 5- and 0 to 15-cm depths on a Weld loam (ene, smectitic, mesic aridic Paleustolls) that were caused by (i) decreasing fallow or increasing cropping intensities, (ii) specific rotations of the same length but with different crop sequencing, and (iii) accumulated residue and roots from reduced- or no-tillage from 1993 to 1997, Total soil organic carbon (SOC) and N for the 0- to 5-cm depth increased by approximate to 20% with continuous cropping rotations compared with W-F rotations. Particulate organic matter-carbon (POM-C) doubled, while POM-N, and soluble organic C (OC) increased by one third for the same comparison. At the 0- to 15-cm depth, SOC, POM-C, and POM-N did not differ among systems with fallow, nor among systems with cropping intensities greater than W-F. Thus, significant differences always existed between W-F and continuous cropping. Generally, fallow had a negative influence on SOC accumulation, and continuous cropping a positive influence on surface SOM. Changes in SOC did not correlate with yields in the five-year comparison of this ongoing study.
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收藏
页码:186 / 191
页数:6
相关论文
共 33 条
[1]  
ANDERSON RL, 1997, TILLAGE ASS P, V9, P1
[2]   SOIL CARBON, NITROGEN, AND BULK-DENSITY COMPARISONS IN 2 CROPLAND TILLAGE SYSTEMS AFTER 25 YEARS AND IN VIRGIN GRASSLAND [J].
BAUER, A ;
BLACK, AL .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1981, 45 (06) :1166-1170
[3]   AGGREGATE-PROTECTED AND UNPROTECTED ORGANIC-MATTER POOLS IN CONVENTIONAL-TILLAGE AND NO-TILLAGE SOILS [J].
BEARE, MH ;
CABRERA, ML ;
HENDRIX, PF ;
COLEMAN, DC .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1994, 58 (03) :787-795
[4]   CROP-ROTATION EFFICIENCIES AND BIOLOGICAL DIVERSITY IN FARMING SYSTEMS [J].
BEZDICEK, DF ;
GRANATSTEIN, D .
AMERICAN JOURNAL OF ALTERNATIVE AGRICULTURE, 1989, 4 (3-4) :111-118
[5]  
Blake G. R., 1986, Methods of soil analysis. Part 1. Physical and mineralogical methods, P377
[6]   Crop rotation and tillage effects on phosphorus distribution in the central Great Plains [J].
Bowman, RA ;
Halvorson, AD .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1997, 61 (05) :1418-1422
[7]   A reevaluation of the chromic acid colorimetric procedure for soil organic carbon [J].
Bowman, RA .
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, 1998, 29 (3-4) :501-508
[8]   CHANGES IN SOIL PROPERTIES IN A CENTRAL PLAINS RANGELAND SOIL AFTER 3, 20, AND 60 YEARS OF CULTIVATION [J].
BOWMAN, RA ;
REEDER, JD ;
LOBER, RW .
SOIL SCIENCE, 1990, 150 (06) :851-857
[9]   PARTICULATE SOIL ORGANIC-MATTER CHANGES ACROSS A GRASSLAND CULTIVATION SEQUENCE [J].
CAMBARDELLA, CA ;
ELLIOTT, ET .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1992, 56 (03) :777-783
[10]   SOIL ORGANIC-MATTER AS INFLUENCED BY CROP ROTATIONS AND FERTILIZATION [J].
CAMPBELL, CA ;
ZENTNER, RP .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1993, 57 (04) :1034-1040