Results 71 to 80 of about 464 (142)
Diagnosis and treatment for a case of Legionella longbeachae severe pneumonia and literature review. [PDF]
Zhong Nan Da Xue Xue Bao Yi Xue Ban, 2021 Feng S, Luo P, Huang S, Ou Z.
europepmc +1 more source
采用全国第二次土壤普查数据结合作者的实测数据,利用1∶100万土壤数据库对青藏高原土壤有机质层、土壤矿质层及整个剖面的土壤有机碳密度和土壤有机碳储量分别进行了估算。结果表明:青藏高原的平均土壤有机碳密度约为C7.2kgm-2,较前人的C8.01~19.05kgm-2全国平均土壤有机碳密度偏低。青藏高原总的土壤有机碳储量约为18.37Pg,其中有机质层土壤有机碳储量约占38.14%,矿质层土壤有机碳储量则占61.86%。中国科学院知识创新工程重要方向项目(KZCX3-SW-339-04 ...
周才平 +4 more
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Global Climate Change and Adaptive Management of Forest Ecosystem [PDF]
, 2014 人类活动所引起的温室效应及由此造成的全球气候变化对全球生态环境的影响正越来越引起人们的关注。森林作为全球陆地生态系统的一个重要组分,对全球气候变化的响应较为敏感。文中系统总结了全球气候变化对物种和森林类型分布、森林生态系统结构和物种组成、森林生产力、森林土壤碳氮循环和森林灾害等几个方面的影响,以及森林生态系统管理面临的挑战,在此基础上提出了适应未来气候变化的森林生态系统管理策略。Human-induced greenhouse effects and their impacts on global ...
卢昌义 +5 more
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Effects of Mixing Tree Species on Soil Enzyme Activity and Carbon-Use Efficiency in Eroded Masson Pine Forest [PDF]
[Objective] Soil microbial metabolic efficiency profoundly affects soil nutrient cycling and soil carbon sequestration in the recovery process of eroded and degraded areas. However, it is unclear how tree species mixture affects soil extracellular enzyme
JIANG Yongmeng +7 more
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Method Optimization for the Determination of Soil Organic Carbon and Its Components by Automatic Titrator [PDF]
The rapid and accurate detection of soil organic carbon and its components (such as particulate organic carbon and mineral-associated organic carbon) is of great significance because they are the key indicators reflecting soil quality.
Angang MING +5 more
core +1 more source
Characteristics and Influencing Factors of Soil CH4 and N2O Fluxes in Typical Broad-leaved Forests in the Yangtze River Delta Region, China [PDF]
[Objective] The forest coverage rate in the Yangtze River Delta region reaches 33.4%, and the underlying surface soil may have an important impact on the regional greenhouse gas budget.
CHEN Bingjiang +7 more
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Effects of Trifolium repens invasion on functional traits and turf quality of Poa pratensis [PDF]
[Objective] Invasion of Trifolium repens occupies the living space of turfgrasses and has been seriously threatening the quality and function of turfs. Examining the impact of T .
BAI Xiaoming +5 more
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Shuitu Baochi Xuebao, 1993 在福建省连城县紫色土分布区设立临时标准地，研究了毛竹林，杂木林，马尾松林，黑荆－马尾松林等不同林型紫色土的酶活性和土壤肥力，结果表明：不同林型紫色土的酶活性，土壤呼吸作用强度均比光板地高，土壤养分状况亦比光板地好，尤其是集约经营的毛竹林，土壤肥力较高，结构性和抗蚀性也较好，从而对紫色土壤肥力的保持起到良好作用。Ｑ型群体分析表明，毛竹林土壤肥力较高，马尾松林，杂木林土壤肥力中等，黑荆－马尾松林 ...
杨玉盛 李振问
doaj +2 more sources
Shuitu Baochi Xuebao, 2008 研究了干旱区绿洲种植年限不同的3种苜蓿地0-10 cm,10-20 cm土层土壤微生物量碳、微生物量氮、微生物量商、呼吸强度和代谢商的变化特征。结果表明:在耕层0-20 cm范围内,苜蓿种植年限的长短对土壤微生物量碳、土壤微生物量氮含量有影响,相对来说微生物量碳、氮在四年生苜蓿地的含量最高,其次是一年生苜蓿地的。不同种植年限苜蓿地之间土壤微生物量商(qMB)、呼吸强度、代谢商(qCO2)差异显著,相对来说种植年限相差越大,差异越大。相关分析结果表明,土壤理化特性对土壤微生物活性有影响,其中土壤微生物量碳、
YANG, JIANG, ZHAI, YANG, JIANG
doaj
Shuitu Baochi Xuebao, 2008 采用野外观测与室内模拟试验相结合的方法,研究了湿地土壤和垦殖10年的农田耕作后土壤呼吸通量、微生物量碳、土壤基础呼吸、土壤qCO2值、水溶性有机碳的动态特征。研究结果表明:小叶章湿地耕作后,土壤含水量明显下降 ...
张磊
doaj