The Character of Rice Roots in Rice-Duck-Fish Commensalisms Ecosystem and its Economic Benefi

Through farmland trial,the character of paddy roots in rice-duck-fish commensalisms ecosystem and its economic benefit were studied.The results showed that rice-duck-fish commensalisms could improve the activity of paddy roots.At the initial tillering stage,full tillering stage,booting stage,full heading stage and ripening period,the roots α-naphthylamine oxidation capability under rice-duck-fish treatment was respectively higher than those in CK area by 18.6%,18.3%,8.3%,13.7%,34.4%,under rice-fish treatment it was higher than those under CK treatment by 9.9%,8.8%,0.8%,7.0%,14.1% respectively.The total absorbability surface area of root systems increased rapidly after rice seeding throwing plantation,reaching the maximum.Around booting stage,at the booting stage their respective surface area was 2.690 7×106,2.348 5×106 and 2.269 2×106 m2/hm2,respectively at rice-duck-fish area,rice-fish area and CK area,then increased slowly or reduced little.Different with root system total absorbability surface area,root system absorbability activity surface area reached the highest at the full heading stage,which was 1.190 5×106,1.089 5×106,1.030 1×106 m2/hm2respectively at rice-duck-fish,rice-fish and CK.Rice-duck-fish commensalisms have certain result of increasing the yield of rice,increased by 231.9 kg/hm2 than that under rice-duck treatment,increase the rate was 4.16%;increased by 761.5 kg/hm2 than that in CK,increase the rate was 15.11%.Analyzed by square difference,the difference between rice-duck-fish area and CK is extremely obvious,without obvious difference compared with rice-fish area.