[Determination of polychlorinated naphthalenes in soil using accelerated solvent extraction-molecular sieves solid-phase extraction coupled with gas chromatography-tandem mass spectrometry]. [PDF]
Se Pu, 2022 新污染物引发的环境和健康风险正逐步受到社会各界的广泛关注,我国第十四个五年规划和2035年远景目标纲要明确“重视新污染物治理”。作为新型的持久性有机污染物,多氯萘(PCNs)在土壤中通常处于痕量水平,一般需要经过多层硅胶柱/氧化铝柱等复杂的净化方法,再结合有效的分析手段才能实现准确测定。关注土壤中多氯萘分离分析方法可以为掌握和监管其在土壤中的污染状况提供技术和方法支持。研究以13X分子筛作为固相萃取吸附剂,评价了其对多氯萘的净化效果。研究发现:使用正己烷作为上样溶剂和淋洗剂,10 mL二氯甲烷/正己烷 ...
Jin J +6 more
europepmc +2 more sources
An in-situ method for assessing soil aggregate stability in burned landscapes [PDF]
, 2023 Due to soil repellency in burned areas, slope runoff and soil erodibility escalates following forest fires, increasing the vulnerability to post-fire debris flows.
Chuanjie XI +6 more
core +1 more source
Water Conservation Function of Artificial Forests in Kubuqi Desert [PDF]
, 2023 [Objective] Research was conducted on understory litter and soil hydrological function for artificial forests in the forest protection station in the eastern section of the Kubuqi Desert.
Chen Hongwei +7 more
core +1 more source
Water-holding Capacity of Reclaimed Grassland with Different Ages in Karst Regions [PDF]
, 2023 [Objective] The water-holding capacity of reclaimed grassland of different ages was studied in order to provide a scientific basis for water retention and soil and water conservation of reclaimed grassland in karst regions.
Li Xuemei +3 more
core +1 more source
Geochemical Characteristics and Environmental Risk Assessment of Heavy Metals in Weathering Profiles of Alkali-enriched Porphyry in Central Yunnan [PDF]
, 2023 BACKGROUNDThe contents of many heavy metals in soil in many areas of southwest China are much higher than the national soil background value, and related studies show that most heavy metals in soil are in a state of “high background and low activity ...
Fangping WEN +10 more
core +1 more source
Shuitu Baochi Xuebao, 2021 为研究崩岗不同土层土壤水力学特性的差异性，采用离心法测定不同土层土壤水分特征曲线，筛选出适合的土壤水分特征曲线拟合模型，结合统计模型，推求土壤的当量孔径分布、比水容量、非饱和导水率和扩散率，分析崩岗不同土层土壤水力学参数的变化规律。结果表明，崩岗土层从红土层到砂土层的变化过程中，土壤质地由黏土向砂土变化；Fredlund & Xing模型对崩岗土壤土水特征曲线拟合效果最好；参数θs、α、n随着质地变黏重逐渐减小；随着土层深度的增加，土壤的持水性能降低；土壤比水容量 ...
辜婧瑶 +3 more
doaj
Shuitu Baochi Xuebao, 2023 以明确自然界中广泛存在的层状结构土壤孔隙分布特征为目的。选黄土高原典型坝地土壤剖面为研究对象,利用CT扫描技术分析耕作层、犁底层、心土层土壤三维结构,探讨层状土孔隙参数随土层结构变化及界面层孔隙特征。结果表明:(1)瘦长型孔隙(孔隙形状系数≤0.2)是各土层土壤孔隙的主要形态。各土层的孔隙参数具有明显差异。耕作层的总孔隙度最高,大孔隙(≥1 mm)分布较多;犁底层孔隙总数量最高,含有较多孤立的小孔隙(≥0.1~0.5 mm)和微小孔隙(≥0.06~0.1 mm),但连通性最差 ...
张佐源 +5 more
doaj
农业科学, 2019 由于近些年,春播时期土壤湿度对农业生产有很大影响,本研究利用人工观测土壤湿度、土壤湿度自动观测仪和无人站观测资料,通过相关分析,建立土壤湿度预测模型,通过模型修正,推算无土壤湿度监测乡镇土壤湿度情况,降水对深层土壤湿度影响较大,气温对浅层土壤湿度影响较大。运用此模型增加气象为农服务的科学性和实用性,拓展气象为农服务。
秀恒 孙 +4 more
semanticscholar +1 more source
Shuitu Baochi Xuebao, 2020 以金沙江下游季节性干旱区紫色土坡耕地为研究对象，使用PR2/6土壤剖面水分测定仪和翻斗式雨量计对雨季0—100 cm土层的土壤含水量和降雨量进行连续观测，分析雨季紫色土土壤水分对降雨的响应。结果表明：每月平均土壤含水量之间存在显著差异，0—20 cm土壤含水率表现为9月 > 8月≈7月 > 6月，在整个雨季呈累加上升趋势。降雨量大小是影响土壤水分补给深度的决定因素。小雨（6.4 mm）只对10 cm土层土壤水分产生影响，平均提高12.35%；中雨（23 mm）对30 cm以上土层土壤水分产生影响，10 ...
徐露 +5 more
doaj
Marine flavobacterium Gramella flava JLT2011 utilization polysaccharide of phytoplankton and characterization of new species of Pelagibaca bacterium [PDF]
, 2015 海洋浮游植物是海洋食物网的初级生产者，是海洋有机质重要分泌者。海洋浮游植物光合作用产生的有机质,通过海洋细菌分泌的一系列胞外酶等将颗粒有机质POM（ParticleOrganicMatter,POM）进一步代谢为生物可利用的溶解有机质（BioavailableDissolvedOrganicMatter,BDOM）。在这一个过程中噬纤维菌-黄杆菌-拟杆菌(Cytophaga-Flavobacterium-Bacteroides,CFB)菌群起着重大的作用。这类细菌形态多样，一般具有较强的运动性和粘附性 ...
林颖芳
core