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Dynamic Effects of Varying Amount of Rice Straw on Different Aluminum Form

Lü Huan-zhe~(1,2),WANG Kai-rong~1,XIE Xiao-li~1,WANG Kai-feng(1.Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125;2.Graduate School of CAS,Beijing 100039)  
Aluminum is the most abundant metal that makes up 7% of the earth's crust and occurs in a number of different forms in the soil.It is harmless as oxides and aluminosilicates.Nevertheless,if the soil pH 5 or even 5.5,as is now the case on 40% of the arable lands in the world,Al will be solubilised into toxic forms,generally referred to Al~(3+),which is a primary factor limiting plant growth have been attributed to several physiological pathways.A possible alternative to ameliorate Al toxicity is the application of such organic manure as rice straw.Laboratory incubation studies were conducted to determine the dynamics effects of rice straw on different Al forms,the results strongly revealed that Al forms and soil pH changed rapidly in 30 days.Soil pH increased rapidly in the first 10 days,and then decreased to the 30th days and tends to the balance.As we all know exchangeable Al are negatively correlates with pH,so exchangeable Al decreased in the first 10 days with the pH increasing,and then increased to the balance.Adsorbent hydroxyl Al had complex hydrolisis and the polyreaction after straw application and changed a little.Exchangeable Al and adsorbent hydroxyl Al transform to organically complexed Al after straw application,so the curve of organically complexed Al increased to the peak on the 10th day,and then decreased to the balance.Because the time of incubation study is short,soil organic matter will not aggregate,so organically complexed Al is instable,which will be change with the environment changes,so the capacity of alleviating Al toxicity is weak.
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