施用秸秆对土壤有机质分解转化及碳库组成和活度的-中国生态农业学报.docVIP

秸秆有机物在土壤中的分解转化及其对土壤碳库组成的影响* 夏海勇1, 2 王凯荣2** 赵庆雷2, 3 张正1 （1. 山东省农业科学院作物研究所 济南 250100; 2. 青岛农业大学 农业生态与环境健康研究所 青岛 266109; 3. 山东省水稻研究所 济南 250100） 研究秸秆添加量对黄潮土和砂姜黑土有机物料分解转化及碳库组成和活度的影响规律，为调节土壤碳循环、培肥地力提供科学依据。通过1年的室内培养试验，研究了添加0~400 g·kg–1秸秆，两种土壤的有机物料分解率、腐殖化系数、C/N、土壤活性有机碳、非活性有机碳、总有机碳和碳库活度（活性有机碳与非活性有机碳的比值）的变化。结果表明：随秸秆用量的增加，有机物料在土壤中分解率增加，腐殖化系数降低；土壤活性有机碳、非活性有机碳、总有机碳和碳库活度均增加，与秸秆添加量呈极显著线性正相关关系；活性有机碳和总有机碳含量间具有极显著的线性正相关性，腐殖化系数同碳库活度间呈极显著线性负相关。秸秆在黄潮土中比砂姜黑土有更易分解的趋势，粘粒含量较高的砂姜黑土更有利于土壤碳库的储存；1年后，黄潮土活性有机碳占总有机碳的比例和碳库活度分别比砂姜黑土平均高7.6个百分点和12.3个百分点，砂姜黑土的腐殖化系数和C/N分别比黄潮土平均高3.2个百分点和2.3。综上，秸秆添加越多，碳库活度便越高，越有利于有机物料的分解，降低腐殖化系数；粘粒含量越高，有机物料的分解受阻，腐殖化系数便越高。 S158.5 文献标示码: 文章编号: Effects of straw addition on decomposition, composition and lability of soil organic carbon pool XIA Hai-Yong1, 2, WANG Kai-Rong2, ZHAO Qing-Lei2, 3, ZHANG Zheng1 (1. Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China; 2. Institute of Agriculture Ecological and Environmental Health, Qingdao Agricultural University, Qingdao 266109, China; 3. Shandong Rice Research Institute, Jinan 250100, China) Abstract Most researches on straw decomposition in soil were conducted with straw addition amounts of 0~100 g per kilogram of soil. Actually, straw may be unevenly incorporated into soil leading to very high local straw addition amount higher than 100 g per kilogram of soil under field conditions and there were contradictory reports on straw decomposition in soil with straw addition amount 100 g per kilogram of soil. In the present study, effects of the amounts of straw addition on organic carbon decomposition, composition and lability of yellow fluvo-aquic soil and lime concretion black soil were studied to provide the theoretical basis for straw decomposition in soil, improvement of soil carbon cycle and the soil fertility cultivation. After one whole year’s soil indoor incubation with straw addition amounts of 0–400 g per kilogram of soil at 35±1℃ with 80%–95% of the field water capacity in the inc