Results 31 to 40 of about 23,362 (181)
有机肥的施用是改善茶叶品质、提高茶叶产量的重要措施之一,牛粪资源化利用有助于降低对农业生态环境的污染,为探讨牛粪有机肥对茶叶产量和品质的影响,通过连续2年(2019—2020年)的田间定位试验,研究了不同比例牛粪有机肥替代化肥对六安瓜片乌牛早茶叶内外品质、产量及茶园土壤肥力的影响,筛选了适宜茶园的牛粪有机肥替代化肥比例。结果表明:全部化肥处理乌牛早茶叶产量最高,为821.87 kg/hm2,其次是牛粪有机肥完全替代化肥处理,为817.13 kg/hm2,随着牛粪有机肥替代比例增加 ...
郭龙 +8 more
doaj
Study on sedimentary characteristics and its effects on the formation and decomposition of gas hydrate on continental slope of the northern South China Sea [PDF]
南海是中国最大的边缘海,覆盖着巨厚的富含有机质的沉积地层,沉积速率高,具备良好的生油生烃能力,具有巨大的资源潜力,是我国的海洋油气资源宝库。天然气水合物作为分布广储量大且对环境友好的资源,具有极高的科学意义和社会意义,南海北部陆坡是我国天然气水合物赋存的最有利海域。近年来南海北部多处天然气水合物钻探采样为我国天然气水合物资源的研究提供了强有力的支撑。本文通过对南海北部陆坡台西南盆地邻近海域地质调查所获沉积物柱状样进行粒度、有机碳、孔隙水、元素矿物等地球化学分析 ...
龚楚君
core
ABSTRACT Proton exchange membrane fuel cells (PEMFCs) require advanced bipolar plate coatings to enhance efficiency, durability, and commercialization potential. This review presents a systematic framework for evaluating and designing bipolar plate coatings, integrating material selection, performance metrics, deposition techniques, and future ...
Shijie Li +12 more
wiley +1 more source
根据西藏16个土类168个土壤剖面的分析资料,探讨土壤有机质和氮素状况及其影响因素。西藏土壤有机质>30g/kg和20~30g/kg的面积分别占39%和46%;其地理分布既有广阔高原面上的水平地带性变化,也有山地和深切河谷的垂直地带性变化。土壤有机质中活性腐殖质一般占30%~45%,以酸性土中的比例较大。土壤全氮>1 5g/kg,1 0~1 5g/kg和150mg ...
刘世全 高丽丽 蒲玉琳 邓良基 张世熔
doaj
The existing states and evolution of P and Fe in shallow sediments from the continental slope of northern South China Sea and their indication for the decomposition of gas hydrate [PDF]
天然气水合物作为当前极具开发潜力的新型清洁能源,受到科学界的广泛关注。海平面下降、洋壳的构造运动、海底沉积物滑塌及洋底水温变化等都可能造成天然气水合物的失稳分解,分解释放的CH4在垂向运移过程中与上层电子受体发生AOM,使SMTZ等作用带磷铁的赋存形态发生变化。磷作为海洋生物的重要营养元素,在海洋生物地球化学循环中有着重要意义,与铁、硫元素及沉积有机质关系紧密,在早期成岩过程中扮演了重要角色;而铁作为地壳中丰度最高的氧化还原敏感性金属元素,在海洋沉积物中的氧化还原过程对磷、硫 ...
杨鸣
core
ABSTRACT The development of sodium‐ion batteries (SIBs) is limited by slow charge transfer kinetics and large material volume changes caused by the large radius of Na+. Leveraging the excellent physicochemical properties and unique heterostructures of metal selenides, ultrafine hetero‐CuFeSe2‐CoSe2 nanoparticles are in situ wrapped by ...
Ying Zhu +5 more
wiley +1 more source
ABSTRACT The development of highly efficient and stable nonprecious metal electrocatalysts for the acidic oxygen evolution reaction (OER) is crucial to advance proton exchange membrane (PEM) water electrolysis. In this work, a dual synergistic strategy was proposed by constructing a Ce‐modified MnO2/MnO heterostructure.
Chuanbin Li +7 more
wiley +1 more source
人工降雨条件下植被覆盖对黄土坡面养分随径流泥沙迁移影响的试验研究
植被覆盖可有效保护地表,抑制产流产沙过程,进而影响坡面养分迁移过程。选取黄土高原典型白羊草和铁杆蒿草地,通过人工模拟降雨试验(雨强60 mm/h,历时60 min,坡度15°),研究植被不同盖度下(10%,20%,30%,45%,60%,80%)坡面径流、泥沙养分特征。结果表明:(1)土壤有机质、全氮和全磷含量均随植被盖度增加呈线性增加(R2≥0.63),相对于铁杆蒿样地,白羊草样地土壤有机质和全磷含量分别增加28.8%~107.1%和10.6%~25.0%,全氮含量减少2.6%~42.5%。(2 ...
李家明, 汪建芳, 杨艳芬, 王兵
doaj
Gradient distributions of nitrogen and organic carbon in the soils from inland to tidal flat in the Yellow River Delta [PDF]
黄河三角洲是我国典型的通过黄河冲积泥沙填海造陆形成的近代沉积区。区域受到黄河冲积、沉积等自然过程和农业耕种熟化等人类活动的双重影响。本研究通过在黄河三角洲地区内陆到河口海湾不同距离采集典型土壤类型剖面发生层样品,探讨土壤有机碳、总氮等生源要素的空间分布规律,为阐明我国典型海岸带地区陆源碳、氮的输送及循环特征提供基础依据。研究结果表明,黄河三角洲内陆与河口地区呈现出完全不同的土壤碳、氮分布规律。表层土壤碳、氮含量在黄河沿岸及三角洲南部均表现出由陆向海逐级递减的空间分布特征 ...
李远 +4 more
core +1 more source
Interface Issues of Inorganic Solid‐State Electrolytes in Secondary Magnesium Batteries
ABSTRACT Solid‐state magnesium batteries (SSMBs) have gained significant attention as promising candidates for next‐generation safe energy storage systems because of the abundance of magnesium (Mg) in the earth's crust, superior energy density, and inherent nonflammability.
Jiren Wang +9 more
wiley +1 more source

