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| Influence of Low Molecular Weight Polyethylene on Nitrogen Contents and Related Enzyme Activities in Potted Wheat Soil |
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| KeyWord:environmental degradable mulch film; low molecular weight polyethylene（LMWPE）; soil nitrogen content; soil enzymes activities |
| Author Name | Affiliation | | WU Guo | Life Science College, Sichuan Normal University | | TAO Zong-ya | Life Science College, Sichuan Normal University | | LI Wei | Life Science College, Sichuan Normal University | | LUO Xue-gang | Engineering Research Center of Biomass Materials（ＳＷＵＳＴ）, Ｍｉｎｉｓｔｒｙ ｏｆ Ｅｄｕｃａｔｉｏｎ | | WANG Qing-lei | Life Science College, Sichuan Normal University | | WANG Ling-qiong | Life Science College, Sichuan Normal University |
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| Abstract: |
| The environmental degradable mulch film（EDMF） can be broken down into smaller bits or powdered residues with decreased molecular weight in a short period，which have provided an available way for solving the white pollution in field ecosystem. The powdered residues in soil have strong hydrophobicity and maybe very slow to be degraded completely. There were much more argument about the environmental biology effects of the mulch film residues on soil microenvironments and crop growth. In the study, it was imitated that the EDMF were broken down into the powdered polyethylene components under natural conditions by adding three kinds of low molecular weight polyethylene（LMWPE） which had different molecular weight（M1=2000, M2=5000, M3=100 000） into the pot-soil and seeded wheat under natural conditions, and nitrogen contents and related enzymes activities in the soil were analysed during the period of wheat growth for providing the evidences of evaluating the environmental safety of degraded residues of EDMF in soil. The results showed that total nitrogen contents and effective nitrogen contents in the pot-soil were lower significantly compared with CK（The group without LMWPE added） during tillering stage, booting stage and florescence, the activities of soil urease were inhibited markedly through jointing stage to filling stage, but activities of soil protease were hardly influenced during whole growth period. It is suggests that deliverability of soil nitrogen contents has been decreased by treatments of powdered LMWPE added into the pot-soil and the environmental security of EDMF needs to be further investigated. |
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