| 吴旭东,蒋齐,俞鸿千,王占军,何建龙.沙质草地植物群落及土壤质地对补播和翻耕措施的响应[J].干旱地区农业研究,2018,36(4):246~251 |
| 沙质草地植物群落及土壤质地对补播和翻耕措施的响应 |
| Response of plant community and soil texture of sandy grassland to the reseeding and plowing |
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| DOI：10.7606/j.issn.1000-7601.2018.04.35 |
| 中文关键词: 植物群落 土壤质地 补播 翻耕 沙质草地 |
| 英文关键词:plant communities soil texture reseeding tillage sandy grassland |
| 基金项目:宁夏科技支撑计划项目( 2015BY11104);宁夏科技支撑计划项目(科技惠民) (2015KJHM23)；宁夏农林科学院科技创新先导资金项目（NKYG-14-10） |
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| 中文摘要: |
| 选取3个翻耕模式（深翻、浅翻及免耕），以未补播的原生沙质草地为对照（CK）,分析不同模式下禾-豆混播草地土壤颗粒组成、植物群落结构特征及数量特征，研究退化沙质草地土壤质地及植物群落对翻耕和补播措施的响应。结果表明：深翻、浅翻、免耕及CK对应的草地群落物种丰富度分别为9、9、5种和8种，机械扰动和补播牧草降低了游击型克隆植物的繁殖与扩展能力，提高了补播牧草在群落中的优势度，深翻处理下多年生禾本科及豆科牧草优势度最为明显，翻耕及补播后草地植物群落物种多样性和均匀度明显增大，生态优势度与物种多样性变化趋势正好相反，其中浅翻处理下补播草地群落物种多样性和均匀度最高，游击型克隆植物提高了原生草地生态优势度；补播草地群落地上生物量大小表现为：深翻(348.39 g·m-2)＞浅翻(285.77 g·m-2)＞免耕(242.08 g·m-2)＞CK(141.83 g·m-2)，且与原生草地存在极显著性差异（P＜0.01）；补播草地土壤颗粒组成主要以50~250 μm的细沙粒为主，深翻、浅翻及补播牧草显著提高了0~20 cm土层土壤黏粉粒含量和土壤颗粒体积分形维数（P＜0.01），土壤质地改善效果明显，土壤整体稳定性明显提高。 |
| 英文摘要: |
| In order to study the responses of plant community and soil texture to tillage and reseeding measures in degraded sandy grassland, the soil particle composition, plant community structure and quantity characteristics of different Gramineae-Leguminous modes were analyzed by selecting three plowing modes (deep plowing, shallow plowing, and no-tillage) and using non-reseeding primary sandy grassland as a control (CK), the results showed that the species richness of deep plowing, shallow plowing, no tillage and CK were 9， 9，5 and 8 respectively in the grassland communities,Mechanical disturbance and reseeding measure reduced the breeding and expanding ability of the guerrilla-type clonal plants,and improved the dominance of the supplementary grass in the community, the dominance of perennial Gramineous and Leguminous plants under deep plowing was the most obvious. The species diversity and evenness of grassland plant communities increased significantly after the deep plowing and shallow plowing, in contrast, the ecological dominance were opposite. among them, the species diversity and evenness of the grassland communities under shallow plowing were the highest.and the guerrilla-type clonal plants increase the ecological dominance of primary grassland. The aboveground biomass of the reseeding grassland community ranged from deep plowing (348.39 g·m-2) > shallow plowing(285.77 g·m-2) > no tillage(242.08 g·m-2)> CK(141.83 g·m-2) to the primary grassland. There was significant difference in biomass compared with primary grasslands. The soil particle composition of the reseeding grassland was mainly dominated by fine sand of 50~250 μm, and the soil clay content and soil particle volume fractal dimension (P<0.01) in 0~20 cm soil layer was improved significantly by deep plowing, shallow plowing and sowing grass, as well as the soil texture and stability was improved significantly. |
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