期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Impact of Simulated Drought Stress on Soil Microbiology, and Nematofauna in a Native Shrub + Millet Intercropping System in Senegal
1
作者 Sidy Diakhaté Ndeye-Yacine Badiane-Ndour +6 位作者 Hassna Founoune-Mboup Sally Diatta Abdoulaye Fofana Fall Rebecca R. Hernandez Laurent Cournac richard dick Lydie Chapuis-Lardy 《Open Journal of Soil Science》 2016年第12期189-203,共15页
Drought stress strongly affects soil biota and impairs crop production, which under climate change will be exacerbated in semi-arid cropping regions such as the Sahel. Hence soil management systems are needed that can... Drought stress strongly affects soil biota and impairs crop production, which under climate change will be exacerbated in semi-arid cropping regions such as the Sahel. Hence soil management systems are needed that can buffer against drought. In West Africa, field studies have found intercropping of millet with the native shrub Piliostigma reticulatum improves soil-plant-water relations, microbial activity and diversity, and suppress parasitic nematodes, which can significantly increase crop yield. However, little information is available on its beneficial or negative effects on soils or crops during water stress. Therefore, the objective was to investigate the impact of P. reticulatum in moderating water stress effects on soil properties and pearl millet (Pennisetum glaucum [L.] R. Br.) productivity. In the greenhouse, soil chemical and microbial properties and millet growth were investigated with a factorial experiment of varying levels of soil moisture (favorable, moderately stressed, or severely stressed water conditions) that was imposed for 55 days on soils containing sole P. reticulatum or millet, or millet + P. reticulatum. The results showed that the presence of P. reticulatum did not buffer soils against water stress in relation to soil chemical and microbial properties measured at the end of the experiment. Severe water stress did significantly decrease the height, number of leaves, and aboveground biomass of millet plants. Additionally, respiration, nematofauna trophic structure and abundance decreased as water stress increased. Lastly, bacterial feeders and plant parasitic nematodes were the most sensitive to severe water stress while fungal feeding nematodes remained unaffected. The results suggested that the intensity of water stress had more negative effects on soil basal respiration rather than soil microbial biomass. 展开更多
关键词 Sub-Saharan Africa Shrub-Based Cropping System Pennisetum glaucum (L.) R. Br. Water Stress Climate Change NEMATODE Basal Respiration Greenhouse Experiment
下载PDF
土壤化学特性、酶活性和产量对农业措施的敏感性研究
2
作者 邵兴华 richard dick 《植物营养与肥料学报》 CAS CSCD 北大核心 2021年第12期2105-2113,共9页
【目的】研究不同农业管理措施(耕作强度、施肥、轮作)对土壤化学特性、酶活性及产量的影响,为选择适合的、对农业管理措施敏感的土壤质量评价指标提供依据。【方法】2019年5月在霍伊特维尔(OHHO,始于1963年),伍斯特(OHWO,始于1962年),... 【目的】研究不同农业管理措施(耕作强度、施肥、轮作)对土壤化学特性、酶活性及产量的影响,为选择适合的、对农业管理措施敏感的土壤质量评价指标提供依据。【方法】2019年5月在霍伊特维尔(OHHO,始于1963年),伍斯特(OHWO,始于1962年),亚当斯(ORAD,始于1992年)3个农业长期试验站分别采集了0—15 cm耕层土壤。在OHHO和OHWO试验站,分别在免耕(NT)、深耕(CT)、浅耕(MT)条件下设轮作(玉米–燕麦–苜蓿)、单作(玉米)处理;在ORAD试验站,分别在为NT、CT条件下,设不施肥、施肥(有、无覆盖物)处理。同年测定了土壤的pH、全氮、全碳、粘粒、砂粒、粉粒含量和β-葡萄糖苷酶、芳基硫酸酯酶、荧光素二乙酸酯活性。【结果】OHWO试验点不同处理间pH无显著差异。OHHO试验点玉米–燕麦–苜蓿轮作处理(COH)或玉米单作处理(CCC)与MT配合pH显著高于其他处理;ORAD试验点豆麦轮作、有覆盖物、施肥(PWY2),豆麦轮作、有覆盖物、不施肥(PWY)与NT配合(PWY2-NT、PWY-NT),及小麦–休闲的WFaNT与WFa-CT处理pH显著高于其他处理。耕作强度、作物轮作影响土壤pH,但pH没有一致的变化趋势,除PWY2-NT处理外施氮肥降低土壤pH。COH-NT、PWY2-NT、WFa2-NT处理全氮、全碳含量显著高于其他处理,说明轮作、免耕配合施肥显著提高土壤全氮、全碳含量;OHHO、OHWO试验点各处理间产量差异不显著,ORAD试验点产量的变化表明除了农业管理措施,产量还受病虫害或当季突发自然灾害的影响。3个试验点轮作配合免耕β-葡萄糖苷酶、芳基硫酸酯酶、荧光素二乙酸酯活性最高。在OHHO试验点β-葡萄糖苷酶可以区分轮作配合浅耕或深耕(COH-MT、COH-CT),单作配合免耕、浅耕、深耕(CCC-NT、CCC-MT、CCCCT)处理间的差异;在ORAD试验点可以区分豆麦轮作+覆盖物+施肥或不施肥分别配合免耕2个处理;区分麦–休闲+施肥或不施肥分别配合深耕2个处理间的差异,而全碳不能区分这些处理间的差异。β-葡萄糖苷酶与全氮、全碳、芳基硫酸酯酶相关性达5%或1%水平。【结论】对外来扰动的敏感性表现为β-葡萄糖苷酶活性>全碳>产量,以β-葡萄糖苷酶活性判断,免耕配合轮作是较为理想的提高土壤质量的农业管理措施。 展开更多
关键词 土壤 化学特性 酶活性 产量 敏感性
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部