Effects of rotational tillage practices on soil structure, organic carbon concentration and crop yields in semi-arid areas of northwest China

被引:27
作者
Hou, X. Q. [1 ,2 ]
Li, R. [1 ,2 ]
Jia, Z. K. [1 ,2 ]
Han, Q. F. [1 ,2 ]
Yang, B. P. [1 ,2 ]
Nie, J. F. [1 ,2 ]
机构
[1] NW A&F Univ, Chinese Inst Water Saving Agr, Yangling 712100, Peoples R China
[2] NW A&F Univ, Minist Agr, Key Lab Crop Physi Ecol & Tillage Sci NW Loess Pl, Yangling 712100, Peoples R China
关键词
Rotational tillage; bulk density; soil organic carbon; aggregate; crop yield; semi-arid areas; WATER-USE EFFICIENCY; CONSERVATION TILLAGE; WHEAT CULTIVATION; NO-TILLAGE; MATTER; NITROGEN; PRODUCTIVITY; MANAGEMENT; RESIDUE; STORAGE;
D O I
10.1111/j.1475-2743.2012.00429.x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Continuous conventional tillage can cause serious soil degradation in rain-fed agriculture, which reduces crop productivity. Adopting suitable tillage practices is very important for improving the soil and increasing crop productivity. Between 2007 and 2010, a 3-year field study was conducted in semi-arid areas of southern Ningxia, China, to determine the effects of rotational tillage practices on bulk density, soil aggregate, organic carbon concentration and crop yields. Three tillage treatments were tested: no-tillage the first and third year and subsoiling the second year (NT/ST/NT); subsoiling the first and third year and no-tillage the second year (ST/NT/ST); and conventional tillage each year (CT). A conventional tillage treatment was used as the control. Under the rotational tillage treatments, the mean soil bulk density at a depth of 060 cm was significantly (P < 0.05) decreased by 4.9% compared with CT, and with the best effect under ST/NT/ST. The soil organic carbon (SOC) concentration and aggregate size fractions and stability at 040 cm depth were significantly (P < 0.05) increased in rotational tillage treatments when compared with the conventional tillage, and the ST/NT/ST treatment produced the highest increases. Significant differences were detected in the SOC concentration in 2 to 0.25mm size fractions at 030 cm depth between rotational tillage treatments and conventional tillage. Biomass and grain yield with the rotational tillage practices were significantly positively influenced over 3 years, and ST/NT/ST produced the highest average crop yields among the three treatments. Therefore, it was concluded that the application of rotational tillage with subsoiling every 2 years and no-tillage every other year (ST/NT/ST) should be of benefit in promoting the development of dryland farming in semi-arid areas of northwest China.
引用
收藏
页码:551 / 558
页数:8
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