| 引用本文： |
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徐文修，罗 明，李大平，赵双印.不同连作年限棉田土壤理化性质及微生物区系变化规律研究[J].大英文模板1,2014,(3):134-138. [点击复制]
- XU Wen-xiu, LUO Ming, LI Da-ping, ZHAO Shuang-yin.Changes in soil physicochemical properties and microflorae under long-term cotton continuous cropping[J].大英文模板1,2014,(3):134-138. [点击复制]
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| 摘要: |
| 于2007年以不同连作年限棉田为研究对象，研究分析连作5 a、8 a、12 a年和15 a棉田土壤容重、土壤氮、磷、钾养分及微生物区系的变化规律，以揭示长期连作造成棉田减产的主要因素。研究结果表明：在棉农自主经营管理条件下，棉田土壤容重并未随着连作年限的增加呈现有规律的变化。随着连作年限的增加土壤速效磷、全氮、全钾含量均呈下降趋势，土壤有机质以及土壤速效钾含量则是连作8 a之后随着连作年限的增加呈下降趋势。随着连作年限的增加，棉田土壤微生物总量呈明显的下降趋势，连作8 a、12 a、15 a棉田的土壤微生物总数平均值分别比连作5 a的下降了40.1%、46.7%、52.4%，而且微生物菌群结构也发生了变化，总体表现为细菌和放线菌数量减少，真菌数量增加的发展态势。 |
| 关键词: 棉田 连作 土壤养分 土壤微生物区系 土壤容重 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（31260312）；新疆干旱区水循环与水利用实验室开放题（XJYS0907-2012-04)；农业部公益性行业专项（201103001） |
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| Changes in soil physicochemical properties and microflorae under long-term cotton continuous cropping |
| XU Wen-xiu1, LUO Ming1, LI Da-ping1, ZHAO Shuang-yin2 |
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| Abstract: |
| Continuous cropping practice (CCP) affects soil physical and chemical properties, vegetation growth and yield. However, few study were conducted on cotton. Elucidation of CCP effects is of importance for the sustainable cotton production in North Xinjiang. Field experiments were conducted on cotton fields with 5 a, 8 a, 12 a, and 15a cropping durations. Soil samples were collected at depths of 0～30 cm. Soil properties such as soil bulk density (BD), organic matter (OM), available nitrogen (AN), available phosphorous (AP),available potassium (AK), total nitrogen (TN), total phosphorous (TP), and total potassium (TK) were measured, and microflora were investigated. The results showed that BD had no consistent temporal patterns of variation across all treatments. AP, TK, and TN progressively decreased with growth stage, while OM and AK did not show the same trends until after 8a CCP. CCP had negative effects on soil microflora. The number of microflora decreased by 40.1%, 46.7%, and 52.4% after 8 a, 12 a and 15 a CCP, respectively. Furthermore, the number of bacteria and actinomycetes decreased whereas the fungi increased as growth stage progressed. The ratios of bacteria to fungi (B/F) and actinomycetes to fungi (A/F) showed a diminishing trend, indicating the degradation in soil fertility by continuous cropping. |
| Key words: cotton field continuous cropping soil nutrient soil microflora soil bulk density |
