Shuitu Baochi Xuebao[目的] 重庆市作为我国长江上游地区经济中心及保障长江中下游生态安全的屏障,是我国典型的生态功能区和生态脆弱区,研究其土地利用的变化特征及生态敏感性对研究区土地利用重构及生态环境保护具有重要意义。[方法] 利用2000年、2010年、2020年3期遥感数据,基于ArcGIS、Fragstats等软件,应用耦合空间距离指数模型、空间自相关分析、地理探测器模型、格网编码等方法综合评价重庆市生态敏感性。[结果] (1)研究区景观基质主要以耕地为主,占全区面积45%以上,2000—2020年,耕地 ...
谢贤健, 苟千陶, 吴汉
doaj
[Determination of perfluorinated compounds in environmental water samples by magnetic solid-phase extraction-liquid chromatography-mass spectrometry and associated risk assessment]. [PDF]
Se PuGu CS +7 more
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, 2012 保护性耕作能够有效减少农田土壤风蚀。通过室内风洞实验,定量分析不同作物留茬、不同秸秆覆盖量对安塞黄绵土风蚀作用的影响。结果表明:(1)小麦留茬、玉米留茬以及秸秆覆盖都可以有效的减少风蚀。小麦秸秆覆盖量为4 210kg/hm2时土壤抗风蚀效率最高,达到95.9%;(2)风蚀量与风速成正相关关系,风蚀量随风速的变化均存在突然增大的转折点且30cm小麦留茬的转折点会明显滞后于30cm玉米留茬和裸土,30cm小麦留茬的抗风蚀效率要好于30cm玉米留茬;小麦秸秆覆盖量越大,抗风蚀效率越好;(3 ...
刘振东 +5 more
core
Shuitu Baochi Xuebao目的为研究不同耕作措施对吉林省中部湿润区坡耕地玉米田土壤团聚体各粒级腐殖质分布与品质的影响，为优化区域耕作制度、土壤肥力提升提供理论支撑。方法以舒兰市典型坡耕地玉米田土壤为研究对象，以常规耕作（CT）为对照，设置秸秆全量覆盖还田免耕（NT）与秸秆全量还田条带旋耕（ST）2种保护性耕作模式，每种模式配套5个子处理（NT1/ST1，传统免耕/条耕；NT2/ST2：NT1/ST1+减肥+微生物制剂Ⅰ；NT3/ST3：NT2/ST2+秸秆促腐（微生物制剂Ⅱ）；NT4/ST4：NT3/ST3+增密5%；NT5 ...
杨淼多 +6 more
doaj
An analysis of errors in Chinese-Spanish sight translation by Chinese university students-a corpus study. [PDF]
Front PsycholLiu S.
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[Mechanism relevant to hepatocellular carcinoma occurrence after negative conversion of viral DNA in treatment of chronic hepatitis B patients with nucleos(t)ide drugs]. [PDF]
Zhonghua Gan Zang Bing Za Zhi, 2019 Gao TJ, Han GY, Lu FM.
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[Development of an ideological and political education design based on course characteristics: taking high performance liquid chromatography as an example]. [PDF]
Se PuYang HL, Tang GF, Lei J.
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[A Study on the hearing level of high-risk children of diabetic mothers]. [PDF]
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za ZhiZhang J +5 more
europepmc +1 more source
[Analysis of the Occurrence and Influencing Factors of Oral Frailty in Elderly Residents of Elderly Care Facilities]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanWei J, Zhao Q, Huang W, Liu X, Zhang X.
europepmc +1 more source