Results 21 to 30 of about 4,056 (198)
Shuitu Baochi Xuebao, 2011 以山东寿光连作2,5,8,10年的大棚土壤为材料,临近露天麦地土壤为对照,研究土壤团聚体中交换性盐基离子组成变化与土壤团聚性关系。结果表明:交换性K+、Na+、Ca2+和Mg2+的平均含量在>0.25mm大团聚体中分布比较均匀,均高于在Mg2+>K+>Na+。同时表明,(K++Na+)/(Ca2++Mg2+)的比值随土壤团聚体粒径的减小而增大。土壤中盐基离子储量和贡献率主要由团聚体的质量含量所决定,>0.25mm的大团聚体贡献率可占88%～90%,其中以2～5mm团聚体储量最大。因此 ...
曾路生 +5 more
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Shuitu Baochi Xuebao, 2017 采用野外调查与室内分析相结合的方法，研究名山地区稻田植茶后土壤团聚体水稳性变化特征及其影响因素。结果表明：稻田及植茶后的土壤水稳性团聚体含量在各粒径及土层间表现不同，稻田、茶园5年和10年土壤水稳性团聚体含量总体上随着粒径的减小呈先降低后上升的趋势，茶园15年水稳性团聚体含量则随着粒径的减小逐渐增加。从不同土层来看，在0—20，20—40 cm土层中，随着稻田植茶年限的增加，土壤团聚体含量以＞2 mm粒径团聚体为主转变为以＜0.25 mm粒径团聚体为主，而在40—60 cm土层中，总体上＜0.25 ...
李欣雨, 夏建国, 田汶艳
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Shuitu Baochi Xuebao, 2021 为探究甘肃小陇山不同林分对土壤团聚体稳定性的影响，选取小陇山林区3种典型林分（油松林、日本落叶松林、锐齿栎林）为研究对象，用Le Bissonnais中的快速湿润（FW）处理方法测定其不同土层深度（0—10，10—20，20—40 cm）土壤团聚体平均质量直径（MWD），并进一步研究土壤基本理化性质（土壤机械组成、SOC、CEC、pH）和根系特征（细根与极细根比例、RLD、RMD、SRL）对土壤团聚体稳定性的影响。结果表明：不同林分下土壤团聚体稳定性表现为锐齿栎林>油松林>日本落叶松林 ...
崔芯蕊 +4 more
doaj +1 more source
Shuitu Baochi Xuebao, 2011 土壤团聚体是土壤结构的基本单元,对土壤物理化学性质及生物化学性质具有重要影响。通过湿筛法对新疆水稻土团聚体及其有机碳的变化进行研究。结果表明:稻田土壤总有机碳随着种植水稻时间的延长而增加,种植水稻100a土壤总有机碳比荒地的增加了28.35g/kg;荒地开垦种植水稻后,随着种稻时间的延长,土壤水稳性团聚体(>250μm)和微团聚体(53～250μm)显著增加,
唐光木 +6 more
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Journal of Ecology, Volume 111, Issue 12, Page 2733-2749, December 2023., 2023 Our results indicate that defoliation and fertilisation, two common grassland perturbations, have contrasting impacts on root traits of grassland plant species, with direct and indirect short‐term consequences for a wide range of soil abiotic and biotic properties that underpin ecosystem functioning.
Yan Liu +2 more
wiley +1 more source
Disasters, Volume 47, Issue 2, Page 437-463, April 2023., 2023 Efforts to reduce the gap between the research evidence base and humanitarian responses have focused on producing quality evidence and ensuring its use in decision‐making. Yet, how evidence translates into field‐level implementation is not well understood in humanitarian contexts.
Enrica Leresche +7 more
wiley +1 more source
Risk, Hazards &Crisis in Public Policy, Volume 13, Issue 4, Page 356-378, December 2022., 2022 Abstract Stakeholder consultation and participation are often viewed as an essential component of hazards governance and disaster risk reduction. However, an extensive literature in the fields of hazards management, disaster risk reduction, planning, and environmental governance has highlighted numerous challenges that have constrained attempts to ...
James M. Jeffers
wiley +1 more source
Influence Mechanism of Ionic Interface Reaction on Soil Porosity [PDF]
, 2023 [Objective] The changes in surface charge properties of soil particles and the net force between particles were analyzed, in order to elucidate the influence mechanism of particle interaction on pore conditions.
Ding Wuquan +3 more
core +1 more source
Erosive Rainfall Thresholds for Five Typical Soils in Water Erosion Region of China [PDF]
, 2022 [Objective] The practical thresholds separating erosive from non-erosive rainfall events were determined to effectively reduce the workload of soil erosion prediction, and to provide references for regional soil erosion prevention.
Liu Baoyuan +3 more
core +1 more source
Comparasion study on the effects of mangrove wetland sediments on the sequestration of typical sulfonamides from the estuarine water [PDF]
, 2015 作为陆地污染物进入海洋的屏障，红树林已然成为众多典型污染物汇聚的场所之一。近年来，海产养殖业的大肆兴起更是加重了抗生素在红树林区的直接污染。锁定态是控制土壤抗生素归宿的主要因素，具有环境存在时间长，危害大等特点，可通过再释放重回到环境中，对环境造成长期危害。对典型磺胺类在红树林群落沉积物中锁定能力的研究对于探索抗生素在红树林区的环境行为和红树林湿地抗生素污染控制及修复功能评估具有现实意义。本文选取了12种水产、禽畜及人用较为频繁的典型磺胺类药物，分别为磺胺甲噻二唑(sulfamethizole,SMT)、
张宇
core