Results 11 to 20 of about 1,813 (181)
Shuitu Baochi Xuebao, 2022 研究晋西黄土区不同密度油松林保育土壤功能变化规律及差异性,评价其保育土壤功能,以加强林分管理和生态恢复建设。以山西吉县蔡家川流域4种不同密度(925,1 325,1 750,2 250株/hm2)油松人工林为研究对象,对其土壤容重、孔隙度等物理性质、有机质等化学性质以及坡面径流泥沙量进行测定和分析,确定了12项评价指标,采用熵权法(EWM)对各密度油松林地的保育土壤功能进行综合评价。结果表明:(1)4种林分密度的油松人工林,土壤容重、总孔隙度、非毛管孔隙度、毛管孔隙度、全氮、全磷、氨氮、硝氮和 ...
兰道云 +6 more
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Root Tensile Characteristics of Herbaceous Plants from Source Areas of Lanniqing Landslide in Zhaotong City, Yunnan Province [PDF]
, 2023 [Objective] The tensile strength characteristics of plant roots were studied to understand the performance of roots in complexes, in order to provide a basis for the selection of plants to be used in ecological slope protection.
Chen Yunying +4 more
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Shuitu Baochi Xuebao, 2000 根据我国北方地区历年油松飞播调查资料和对典型播区的调查，阐明了油松飞播的地理分布和效果；同时运用统计分析和模糊数学分析等方法，对影响油松飞播成效的主要因子作了系统的宏观分析，得出年均降水量和年均气温是影响飞播效果的主要因子。在此基础上，对北方地区油松飞播造林进行了适宜性分区，分区结果将油松飞播划分为３个区，即造林适宜区，造林次适宜区和造在适宜区，对指导今后油松飞播生产具有重要意义。
吴钦孝 韩洛川
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Study on reductive amination of biobased levulinic acid [PDF]
, 2016 乙酰丙酸是重要的生物基平台化合物，其转化利用受到科研工作者的广泛关注。乙酰丙酸的还原胺化是制备高附加值乙酰丙酸胺化衍生产品的重要途径，近年来成为研究的热点。本论文建立了无催化剂乙酰丙酸还原胺化的反应体系，探讨了乙酰丙酸还原胺化合成直链氨基酸4-二甲氨基戊酸（4-DAPA）和环状化合物5-甲基-2-吡咯烷酮（5-MeP）的反应途径。 首先，研究了以N，N-二甲基甲酰胺为胺源，在无催化剂条件下直接还原胺化乙酰丙酸合成新型化合物4-二甲氨基戊酸（4-DAPA）的反应途径。在200℃条件下反应4h，4 ...
王彦钧
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Veterinary Dermatology, Volume 36, Issue 6, Page 862-869, December 2025.ABSTRACT Background Chronic cases of canine otitis externa (OE) often develop infections with Pseudomonas aeruginosa (PA). Given the organism's high level of resistance, veterinary surgeons often turn to compounded solutions. Limited data describing the stability and potency of compounded ceftazidime (CAZ) solutions are available, which may affect ...
McKenna Snidow +6 more
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Accumulation Characteristics and Hydrological Effects of Litter in Mixed Robinia pseudoacacia Plantations [PDF]
[Objective] Studying the accumulation characteristics and hydrological effects of typical mixed Robinia pseudoacacia plantations is crucial for deeply investigating the water conservation capacity of artificial forests on the Loess Plateau.
CAO Zetao +5 more
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IET Collaborative Intelligent Manufacturing, Volume 6, Issue 4, December 2024.Domain‐adaptation‐based named entity recognition with information enrichment is proposed for developing an equipment fault knowledge graph. A question answering application of the equipment fault knowledge graph is proposed. Abstract Numerous files, such as records and logs, are generated in the process of equipment diagnosis and maintenance (D&M ...
Dengrui Xiong +3 more
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Characteristics of Root Systems of the Main Tree Species in The Semiarid Area of Western Liaoning Province, China [PDF]
, 2002 中国遼寧省阜新県における木本植物15種を対象にして,掘り取り調査により根系の分布特徴および現存量を調査した。その結果,乾燥環境において耐乾性がある樹木の根系はさまざまな形で発達していることが分かった。樟子松,油松,赤松,モンゴリナラ,チョウセントネリコおよびコツギグリアは主根が深く伸長し,側板も発達し,細根が多いことから,深根型耐乾樹種といえる。コノテガシワ,オオミノニレおよびマンシュウイタヤは主根が浅いが,側根が広範に発達し,細根の量が多いから,浅根型耐乾樹種といえる ...
劉, 琪璟 +4 more
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Topical and transdermal botanical formulations of the Chinese pharmacopoeia—A review
Phytotherapy Research, Volume 38, Issue 9, Page 4716-4735, September 2024.Abstract In pharmaceutics, ingredients are classified as active ingredients and excipients. In topical/transdermal phytomedicines, an ingredient may serve both functions. Published information on these dual‐purpose ingredients and their pharmacological relevance is limited.
Jingyi Gu +3 more
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Shuitu Baochi Xuebao, 2022 为了探讨混交林与纯林养分状况和固碳能力的差异,以黄土丘陵沟壑区刺槐(Robinia pseudoacacia)纯林、油松(Pinus tabuliformis)纯林以及刺槐+油松(Robinia pseudoacacia+Pinus tabuliformis)混交林、刺槐+山杨(Robinia pseudoacacia+Populus davidiana)混交林为对象,通过野外调查和室内分析相结合的方式,研究混交林与纯林生态系统的生态化学计量特征与碳储量。结果表明:(1)刺槐 ...
焦秋燕 +6 more
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