黄土高原南部河谷区大棚周年高效栽培技术          下载免费PDF全文

白灵军  姜小凤 《陕西农业科学》2021,(8):100-102

在大棚蔬菜生产中，普遍存在：茬口安排不合理，生产时间短，市场供应力不足，经济效益不高等问题。采用“春提早茬薄皮甜瓜+越夏茬小青菜+越冬茬蒜苗”高产高效技术栽培模式，使大棚生产实现周年化，增效26.7%～33.1%,经济效益十分显著。  相似文献   

不同施肥处理对谷稗生物量和品质的影响     

王艳  肖洋 《中国农学通报》2022,38(12):20-25

为了研究不同施肥处理对谷稗的生物量及品质的影响,以‘朝牧一号'稗子为试验材料,设置4种施肥方式（A有机肥、B有机肥+无机肥、C无机肥、D不施肥）。收集样品后,用烘干恒重的方法测得谷稗生物量的数据。结果表明,处理C的生物量为871 g/m²,比A、B和D处理分别增加了27.2%、11.9%、56.6%;处理C的粗蛋白含量为10.38%,分别比处理A、B和D增加了19.8%、2.9%、13.2%;B处理的谷稗粗脂肪含量为1.29%,比D处理减少了60.3%;D处理的谷稗酸性洗涤纤维(ADF)和中性洗涤纤维(NDF)最低,分别为35.11%和66.11%。在4种施肥方式中,以有机肥+无机肥处理的综合表现较好。本研究结果为东北黑土区高产优质谷稗栽培技术的制定奠定了理论基础。  相似文献   

Multifunctionality in practice: Measuring differences in urban woodland ecosystem properties via functional traits     

《Urban Forestry & Urban Greening》2022

The ability of urban woodlands to regenerate and provide ecosystem services depends on the maintenance of a range of ecosystem functions and processes (i.e. multifunctionality). Many conservation decisions are made by local land stewards and rely on taxonomic characterization of woodlands to infer ecosystem properties, but there is reason to doubt this approach. Can functional traits provide better information on ecosystem multifunctionality? We compare three methods for capturing differences in urban woodland multifunctionality. We ask whether differences in (1) species composition, (2) traits associated with urbanization (urbanization markers) or (3) traits associated with specific ecosystem properties (functional markers) best capture actual differences in colonisation, water infiltration and decomposition in woodlands across a rural-urban gradient (Montreal, Canada). We use Procrustes superimposition and Mantel tests to compare the fit of each method. We propose the functional Mahalanobis distance to measure the distance of an urban woodland from a reference range of multifunctionality.All three methods were significantly congruent with actual differences in ecosystem multifunctionality, but the strength of the rank-order correlations varied widely. Species composition and urbanization markers had a similar but weak correlation with differences in multifunctionality. Importantly, the mismatch between species composition and multifunctionality increased with urbanization. Functional markers captured ecosystem multifunctionality better than either species composition or urbanization markers.Commonly used species- and general trait-based approaches were poor measures for multifunctionality in our urban woodlands. Functional markers rely on vegetation inventories already routinely collected by land stewards and openly available trait information: they may provide a cost-effective way of capturing multifunctionality in urban systems. More broadly, the functional Mahalanobis distance provides a quantitative measure of site-level multifunctionality that allows land stewards to compare woodlands with a reference range of variability in a format that can directly inform conservation decisions.  相似文献   

高垄覆膜花椰菜、西葫芦、丝瓜 轮套作栽培技术     

贾庆虎 《蔬菜》2023,(2):68-71

摘要：为了解决蔬菜生产夏季伏缺严重及缓解土壤盐渍化问题，利用大拱棚进行越冬松花菜—早 春西葫芦—越夏丝瓜1年3茬免耕栽培技术模式研究，应用轮作、高垄、免耕、一膜多用等多项技 术，不仅提高了土地利用率，缓解了土壤连作障碍，而且实现了蔬菜周年安全生产，每667 m2 总产 值3.1万～3.5万元，相对于传统早春西葫芦、夏季伏休、秋延迟花菜双季栽培模式，每667 m2 可新增经济 效益6 000元以上。  相似文献