Results 81 to 90 of about 1,245 (105)
Progress Analysis and Development Prospects of Soil Ecological and Environmental Effects of Interlayer Construction [PDF]
[Objective] This study systematically summarized and analyzed the current application status, technical characteristics, and environmental benefits of interlayer construction in soil improvement, nutrient cycling, ecological restoration, and crop ...
CHEN Jihong +7 more
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[Research on coronavirus disease 2019 (COVID-19) detection method based on depthwise separable DenseNet in chest X-ray images]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2020 Feng Y +5 more
europepmc +1 more source
秸秆碳和硫酸铝对富营养化水体中氮磷的吸收去除效应及其影响因素
Shuitu Baochi Xuebao, 2011 为解决中国水体富营养化问题,将秸秆碳与硫酸铝作为一种有效吸附水体中总氮、总磷的吸附剂,通过室内模拟试验,采用平衡吸附法,考察了秸秆碳和硫酸铝投加量、pH值、振荡时间、温度、扰动、秸秆碳粒径等不同环境因素条件下对吸附效果的影响。结果表明:在秸秆碳和硫酸铝投加量为0.2 mg/L、振荡时间为120 min的条件下,吸附效果最好,去除率可达80%以上。通过对各因素与秸秆碳、硫酸铝对总氮和总磷的吸附效果分析得知,加入适量的秸秆碳和硫酸铝,可以降低水体中总氮、总磷的含量,吸附效果对温度、振荡时间、pH值变化敏感 ...
王爽, 赵兰坡
doaj
The Impact of Mixed Application of Modified Straw Biochar and Organic Fertilizer on Soil Water Retention and Fertility Maintenance in the Loess Hilly Dry Area [PDF]
[Objective] This study aimed to investigate the effects of different modified corn straw biochars on the water retention and fertilizer conservation capacity of arid loess soil and their effects on crop growth.
CHANG Fangling +5 more
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Shuitu Baochi Xuebao, 2020 为探究作物秸秆还田对土壤结构的改良效果，采用二因素裂区设计，主因素施肥（F）：F1（施NPK复合肥）和F0（不施肥）；副因素作物种类（B）：B1（油菜）、B2（玉米）、B3（马铃薯）、B4（燕麦）和B5（荞麦），以不施肥不种作物的空白处理为对照CK。采集样品后测定土壤容重、孔隙度、毛管孔隙度和田间持水量，以及团聚体粒径和土壤MWD、GMD和D值。结果表明：5种作物秸秆还田降低了土壤0—60 cm土层的土壤容重，增加了毛管孔隙度和田间持水量，20—60 cm土层为主要改善土层；同时，增加了土壤>0.25 ...
范倩玉 +6 more
doaj
Effects of Organic Fertilizer Substitution and Aggregation on Microfauna Communities in a Red Soil [PDF]
[Objective] Red soil is a typical soil in Southern China, and organic substitution is an important way to improve the physicochemical properties of red soil.
DING Weixin +6 more
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Shuitu Baochi Xuebao, 2004 利用室内模拟降雨试验，研究了秸秆覆盖对坡面土壤矿质氮素径流流失和入渗的影响。结果表明：秸秆覆盖可使侵蚀量显著减少，减沙效应十分明显。由于秸秆覆盖使坡面径流流速减弱，增加了表层土壤与地表径流的作用强度，使溶解和解吸于径流中的矿质氮素含量增加，但由径流显著减少，矿质氮流失总量仍减少。与裸地相比，秸秆覆盖可显著地增加土壤水分和硝态氮的入渗深度和入渗量。
张亚丽 张兴昌 邵明安 李世清
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Shuitu Baochi Xuebao, 2008 采用静态箱—气相色谱法对保护性耕作和常规耕作小麦田的N_2O排放进行了原位测量,测量了土壤温度、水分、无机氮等相关影响因子。结果表明:(1)保护性耕作及常规耕作麦田N_2O的排放具有明显的季节性变化规律,各处理变化趋势较为一致。(2)N_2O的平均排放通量和季节排放量,除免耕秸秆还田外,保护性耕作与常规耕作差异显著。(3)在小麦生长季内,保护性耕作农田均表现为N_2O的排放源。(4)各处理N_2O季节排放量大小顺序为:耙耕秸秆还田(1.64 kg/hm~2)>旋耕秸秆还田(1.59 kg/hm~2 ...
赵建波 +7 more
doaj
Enzymatic Characterization of Lytic Polysaccharide Monooxygenase TtLPMO9Y and Its Role in Juice Clarification and Cellulose Degradation [PDF]
A novel lytic polysaccharide monooxygenase, TtLPMO9Y, was cloned and expressed from Thermothelomyces thermophilus. Its enzymatic properties were characterized, and its role in the degradation process of cellulose and pectin in plant cell walls was ...
LI Cong, NIU Yufeng, ZHAO Guozhu, ZHENG Fei
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