| 冬种黑麦草对6种稻田土壤微生物量碳、氮的影响 |
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| 引用本文： | 朱波,胡跃高,肖小平,杨光立,张帆,曾昭海.冬种黑麦草对6种稻田土壤微生物量碳、氮的影响[J].中国农学通报,2009,25(3):225-229. |
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| 作者姓名： | 朱波 胡跃高 肖小平 杨光立 张帆 曾昭海 |
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| 作者单位： | 1. 中国农业大学农学与生物技术学院,北京,100193
2. 湖南农业科学院土壤肥料研究所,长沙,410125 |
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| 基金项目： | 国家自然科学基金，国家科技支撑计划 |
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| 摘 要： | 利用氯仿熏蒸浸提法研究了南方双季稻区6种母质发育的土壤种植黑麦草(Lolium multiflroum Lam.)作为冬季覆盖作物对土壤微生物量碳、氮周年动态的影响。结果表明：土壤类型对微生物量碳、氮影响显著（P＜0.05)。其中板页岩土壤微生物量碳含量最高，为450.8mg kg-1；河沙泥微生物量最低，为60.8 mg kg-1，由大到小排列为：板页岩＞紫土＞花岗岩＞红壤＞石灰岩＞河沙泥。不同取样时期内土壤微生物性状有显著差异（P＜0.05)，种植黑麦草各处理比对照（冬闲）显著提高了土壤有机质含量和微生物量碳、氮。所有处理表现出相似的微生物量周年变化趋势：水稻成熟期高于分蘖期（P＜0.05)，晚稻生长季节大于早稻季节。土壤微生物量受土壤类型、土壤营养元素含量和种植制度的综合影响，微生物活动与作物生长有关。冬季种植黑麦草可显著提高土壤有机质含量和微生物量（P＜0.05)，在有机质分解快、有效养分含量低的土壤中效果更显著。
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| 关 键 词： | 紫花苜蓿 紫花苜蓿 微肥 产量 品质 |
| 收稿时间： | 2008-11-20 |
| 修稿时间： | 2008-12-13 |
Effects of Ryegrass on Soil Microbial Biomass C, N in Six Different Paddy Soils |
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| Zhu Bo,Hu Yuegao,Xiao Xiaopin,Yang Guangli,Zhang Fan,Zeng Zhaohai.Effects of Ryegrass on Soil Microbial Biomass C, N in Six Different Paddy Soils[J].Chinese Agricultural Science Bulletin,2009,25(3):225-229. |
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| Authors: | Zhu Bo Hu Yuegao Xiao Xiaopin Yang Guangli Zhang Fan Zeng Zhaohai |
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| Institution: | Zhu Bo, Hu Yuegao, Xiao Xiaoping, Yang Guangli, Zhang Fan, ZengZhaohai (1. College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193; 2. Soil and Fertilizer Institute, Changsha 410125) |
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| Abstract: | In the current study, the effects of ryegrass (Lolium multiflroum Lam.) planted as a winter cover crop on soil microbial biomass C and N in six soil types were evaluated by a chloroform-fumigation-extraction method in southern China’s double-rice region. According to the results, soil type and sampling date have significant effects (P＜0.05) both on soil microbial biomass C and N. In the six different soil types the highest soil microbial biomass C was found in Yellow clayey soil (YCS) and the lowest value in Alluvial sandy soil (ASS), values averaged across the year were 450.8 and 60.8 mg kg-1, respectively. When arranged in a decreasing order, it was Yellow clayey soil (YCS) ＞Purple clayey soil (PCS)＞Granitic sandy soil (GSS)＞Red clayey soil (RCS)＞Grey clayey soil (GCS)＞Alluvial sandy soil (ASS). Ryegrass increased soil organic matter and microbial biomass C and N significantly (P＜0.05) compared with CK(fallow). All the treatments followed a similar seasonal trend in soil microbial biomass: greater values were found at maturity stage and at middle-rice season while the lower values were found at tilling stage and at early-rice season. We thus concluded that soil microbial activities were related to crop stages and the microbial biomass was affected by a complicity of factors including soil type, nutrient availability and crop management. Ryegrass could increase soil organic matter and microbial biomass significantly, especially in soils with a high organic degradation rate and low available nutrient contents. |
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| Keywords: | double-rice system soil type ryegrass soil microbial biomass cover crop |
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