Effect Of Organic Material Decomposition On Soil Biochemistry Characteristic And Copper Forms

With the rapid development of modern agriculture and industry, the area of copper polluted soil was broaden gradually, and the soil contamination became more seriously. The copper forms and availability intimately related with organic material decomposition. Study the effect on transformation of copper forms, the plants growth in copper contaminated soil and copper accumulation of organic material decomposition, have important implication on improvement of plant quality and renovation of copper contaminated soil. In this paper, lab simulated conditions and pot experiment are used to systematicly studied the effect on copper form distribution characteristic and biochemistry characteristic of organic material decomposition. Studied the reaction and copper absorbtion accumulation of rape, and the relationship with biological availability. The main results are as follows:1. The effect on copper form and variation trend were significant for the type of organic material. The partition coefficient of Ex-Cu, OM-Cu, Resd-Cu were increased, while the Carb-Cu declined by organic material application. The partition coefficient of FeMn-Cu was increased by spend mushroom compost, chicken manure and maize straw application, while it was declined by cow manure application. The applicaton of organic material declined the partition coefficient of Relax-Cu, and the spend mushroom compost treatments and cow manure treatments declined significant(P<0.01). The partition coefficient of Relax-Cu played a negative correlation with the content of organic material application, and it played the trend of declined first, then increased, finally declined. In rape planting soil, The effect on copper form distribution were significant for the type of organic material. At Cu0(No Cu application) level, the effect on Relax-Cu were not significant by spend mushroom compost or maize straw application, while it was declined significant by chicken manure application(P<0.01). At Cu1(100 mg·kg-1) level, the partition coefficient of Relax-Cu were declined by organic material application. At Cu2(200 mg·kg-1) level, 2%, 4%, 6% spend mushroom compost and 6% chicken manure application treatmemt declined the partition coefficient of Relax-Cu, while 2%, 4% chicken manure and 2%, 4%, 6% maize straw application treatment increased it.2. The effect on pH was remarkale for the type of organic material. The declined efforts on pH were significant by chicken manure and maize straw application(P<0.01), while it was increased significant by spend mushroom compost(P<0.01). Besides that, cow manure has not much effect on pH. During the incubation time, the pH played the trend of declined gradually. The Eh of soil were declined by organic material application. During the incubation, the Eh of organic material application treatments were rising gradually.3. The content of NO3--N was increased significant by cow manure and chicken manure application, while the spend mushroom compost treatment was decreased significant(P<0.01). The content of NH4+-N was increased significant of the three types of organic materials(P<0.01), and performed decreased first, increased second and then decreased trend of every treatment. The net mineralization nitrogen was decreased significant by spend mushroom compost application(P<0.01), while it was increased significant by chicken manure and cow manure application(P<0.01), the every organic material addition treatment performed declined first then increased and finally decreased.4. The improvement of content of SEEC and SMBC were stimulated by organic material application, the improve effect was depended on the contents of organic matter and easy-decomposing organic matter. The declined of SMBC by cooper polluted were relieved by organic material application. The SMQ were improved by chicken manure and maize straw application, while it was declined by spend mushroom compost and cow manure.5. The accumulation of CO2-C and rate of release of soil respiration were improved by organic material, and the improvement by spend mushroom, chicken manure, maize straw were significant(P<0.01). The improvement to the accumulation of CO2-C and rate of release of soil respiration were, maize straw>chicken manure>spend mushroom compost>cow manure.6. In this experiment, the individual plant biomass was increased by copper(100 mg·kg-1, 200 mg·kg-1), and it was declined by organic material. With the increasement of copper content, the content of copper in rape were increased. At Cu0(No Cu application) level, the content of copper in rape were declined by organic material. At Cu1(100 mg·kg-1) level, the effect on copper in rape was not too much by spend mushroom compost and maize straw application, and 2% chicken manure has the seem effort. And 4%, 6% chicken manure increased the copper in rape significant(P<0.01). At Cu2(200 mg·kg-1) level, the content of copper in rape was increased by organic material application.