红壤旱地和稻田土壤中有机底物的分解与转化研究
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*中国科学院知识创新工程项目(KZCX2-YW-408,KZCX2-WY-423);国家自然科学基金项目(402350574、0571086);国家重点基础研究发展规划项目(2002CB412503)资助


DECOMPOSITION AND TRANSFORMATIONS OF ORGANIC SUBSTRATES IN UPLAND AND PADDY SOILS IN RED EARTH REGION
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    摘要:

    14C标记葡萄糖和稻草为底物,室内培养法研究在相同水分条件下,红壤旱地和稻田土壤中新鲜有机物的分解与转化的差异,以及对土壤原有有机碳矿化的影响.在100d内葡萄糖14C在旱地和稻田土壤中的累积矿化率分别为49.6%和46.7%,稻草14C为25.2%和21.8%;两种底物对土壤原有有机碳分解产生的"激发效应"和对土壤微生物生物量碳(BC)的影响均以旱地土壤大于稻田土壤.在旱地和稻田土壤中葡萄糖14C转化为土壤BC的最大比率分别为23.5%和21.6%,稻草14C分别为10.4%和11.3%.根据添加14C标记葡萄糖处理中14C标记微生物生物量碳(14C-BC)的变化,得到旱地和稻田土壤BC的周转时间分别为329d和127d.这些结果表明在含水量为45%饱和持水量(WHC)条件下,有机底物在旱地土壤中的分解快于稻田土壤,但稻田土壤BC的周转速率快于旱地土壤.

    Abstract:

    Decomposition and transformations of added organic substrates (14C labeled glucose and rice straw) in upland soil and paddy soil and their influences on mineralization of native soil organic C with soil samples collected from the red earth region of China were investigated under incubation at 25℃ and 45% water holding capacity (WHC) for 100 days.During this period,49.6% and 46.7% of glucose-C were mineralized in the upland soil and in the paddy soil,respectively,and the correspon sive values for straw-C were 25.2% and 21.8%.The influences of these amendments on soil microbial biomass C (BC) and on the mineralization of soil native organic C were larger in the upland soil than in the paddy soil.The maximum percentages of glu cose-C assimilated by the microbial biomass were 23.5% and 21.6% for the upland soil and the paddy soil,respectively,and the corresponsive values for straw-C were 10.4%and 11.3%.Under the conditions,the turnover time of BC,calculated from the gross turnover rate of 14C BC in the treatment with glucose,was 329 days and 127 days for the upland soil and the paddy soil,re spectively.These results demonstrated that under soil moisture of 45% WHC,the decomposition rate of glucose and rice straw was faster in the upland soil than in the paddy soil,but the turnover rate of BC was in reverse.

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李玲,肖和艾,吴金水.红壤旱地和稻田土壤中有机底物的分解与转化研究[J].土壤学报,2007,44(4):669-674. DOI:10.11766/trxb200604290413 Li Ling, Xiao Heai, Wu Jinshui. DECOMPOSITION AND TRANSFORMATIONS OF ORGANIC SUBSTRATES IN UPLAND AND PADDY SOILS IN RED EARTH REGION[J]. Acta Pedologica Sinica,2007,44(4):669-674.

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  • 收稿日期:2006-04-29
  • 最后修改日期:2006-08-20
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  • 在线发布日期: 2013-02-25
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