Effects of intercropping of maize varieties on soil aggregate composition and stability
In order to elucidate the effects of intercropping of maize varieties on soil aggregate composition and stabil-ity,a two-year field experiment was conducted.The root mass density(RMD),root length density(RLD),and soil aggregate indexs[＞0.25 mm aggregates content(R＞0.25),mean weight diameter(MWD),geometric mean diame-ter(GMD)]under different treatments[T1,one cultivar monoculture;T2,two-cultivar intercropping;T3,three-cultivar intercropping;T4,four-cultivar intercropping]were determined.It was shown that compared to monocul-ture,intercropping of maize varieties increased RMD,RLD,MWD,GMD and R＞0.25.Compared with the T1 treat-ment,the RMD under T2,T3,T4 treatments was significantly(P＜0.05)increased by 232％,657％,702％,re-spectively;the RLD was significantly increased by 515％,1 508％,1 531％,respectively;the R＞0.25 determined by dry sieving method was significantly increased by 0.65,0.89,1.02 percentage points;the MWD determined by dry sieving method was significantly increased by 7.2％,10.7％,15.7％,respectively;the GMD determined by dry sieving method was significantly increased by 13.1％,21.1％,31.9％,respectively;the R＞0.25 determined by wet sieving method was significantly increased by 4.34,9.42,11.81 percentage points;the MWD determined by wet sieving method was significantly increased by 19.6％,41.2％,54.9％,respectively;the GMD determined by wet sieving method was significantly increased by 27.0％,64.9％,87.8％,respectively.In conclusion,intercrop-ping of maize varieties could enhance the particle size distribution of soil aggregates and their stability by increasing root characteristics,such as root mass density and root length density.
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