Seasonal dynamics of nitrogen and phosphorus concentrations,and nutrient resorption efficiencies of Casuarina equisetifolia branchlets in Dongshan County,Fujian [PDF]
, 2009 对福建东山赤山林场短枝木麻黄纯林小枝中的n和P含量、n∶P比、养分再吸收率的季节动态进行研究。结果表明,随着小枝的成熟和衰老,各季节n和P的含量依次降低,其中衰老小枝中n和P含量分别为(3.97±0.21)~(8.64±0.58)Mg·g-1和(0.04±0.03)~(0.10±0.03)Mg·g-1,基本上表现为n和P的完全再吸收。成熟小枝n∶P比的季节动态介于(18.67±3.24)~(37.98±1.32)之间,均高于16,表明木麻黄的生长受到不同程度的P限制。n、P再吸收率的季节变化分别为(51.
叶功富 +5 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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不同沙土配比对盆栽平邑甜茶的生长及~(15)N吸收、利用和损失的影响
Shuitu Baochi Xuebao, 2011 以当年生盆栽平邑甜茶为试材,应用15N同位素示踪技术研究不同沙土配比(不加沙、沙/(沙+土)=20%、40%、60%、80%、纯沙)对植株的生长及15N吸收、利用和损失的影响。结果表明:不同的沙土配比处理,平邑甜茶植株具有不同的生长状况及氮素吸收、利用和损失。沙土配比20%处理的植株生长量(株高、茎粗和总干重)最大(37.54 cm,3.457 mm和16.20 g),60%处理的全氮和15N吸收量最大,分别为189.31,32.39 mg,20%～60%处理下的生长量与氮素吸收 ...
房祥吉 +6 more
doaj
Effects of different types of organic fertilizers on soil, growth and fruiting characteristics, and nut quality in walnut orchards [PDF]
[Objective] The study aimed to explore the effects of different organic fertilizers on the physical and chemical properties of the soil, tree growth, fruiting characteristics, and nut quality in a walnut orchard. [Methods] A randomized block experimental
JIANG Dezhi +6 more
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Shuitu Baochi Xuebao, 2006 在大田条件下,研究了花后灌水对高油玉米碳氮积累和运转的影响。结果表明，花后灌水降低了高油玉米叶、茎、鞘等营养器官贮藏物质、氮紊的再运转量和再运转率以及贮藏物质、氮素的总运转量和总运转率，花后籽粒吸收氮素量和光合同化物输入籽粒量表现为不灌水〉灌一水〉灌三水。花后籽粒吸收氮素量对籽粒氨素的贡献率则与营养器官贮藏氮素转移的贡献率相反，即灌三水处理值表现最高，花后籽粒吸收氮素量和光合同化物对籽粒的贡献率远大于营养器官贮藏氮素和同化物转移的贡献率。高油玉米籽粒、蛋白质、淀粉和油产量以花后灌一水最高，灌三水时降低 ...
黄勇 +4 more
doaj +2 more sources
西宁地区ICU老年慢性阻塞性肺疾病伴严重呼吸衰竭的危险因素分析
Zhongguo shiyan zhenduanxue, 2020 目的分析重症监护室(ICU)老年慢性阻塞性肺疾病伴严重呼吸衰竭的危险因素,为防范ICU老年慢阻肺患者发生严重呼衰措施制定提供参考。方法本院ICU 2017年1月-2018年10月收治的老年慢性阻塞性肺疾病(COPD)伴严重呼吸衰竭患者82例为研究对象设为观察组,选择同期入住ICU的102例老年慢性阻塞性肺疾病未伴严重呼吸衰竭患者设为对照组。收集整理两组患者临床资料及预后资料。采用单因素分析法对两组患者的临床资料进行分析,对于差异有统计学意义的指标纳入多因素Logistic系统行高危因素分析 ...
崔婷 +4 more
doaj
Sensory Evaluation and Metabolomic Analysis of Lycium Leave Tea [PDF]
The sensory quality and metabolite profiles of the fresh and dried buds and leaves of Lycium from 26 cultivars (lines) were analyzed by sensory evaluation and metabolomics combined with multivariate statistical analysis. The results of sensory evaluation
LU Li, ZHOU Chengzhe, XU Kai, ZHANG Mengcong, WEN Shengjing, DUAN Linyuan, TIAN Caiyun, SHI Biying, ZHANG Bo, GUO Yuqiong
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Regulatory mechanism of exogenous myo-inositol improving high temperature stress tolerance of tomato seedlings [PDF]
[Objective] Studing the effect of exogenous myo-inositol on the physiological and biochemical indexes of tomato seedlings and the molecular mechanism of tolerance to high temperature stress will provide a theoretical basis for the improvement of heat ...
CHEN Yan +5 more
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交联聚丙烯酰胺和AM真菌对玉米苗生长、养分吸收和生理指标的影响
Shuitu Baochi Xuebao, 2011 在玉米育苗基质中加入交联聚丙烯酰胺(crosslinked polyacrylate amine,CPA)和接种AM真菌,研究它们对玉米苗生长、养分吸收及有关生理指标的影响。结果表明,在-CPA的基质中,接种AM真菌的玉米苗生物量高于不接种,并且增加磷含量与吸收量,提高硝酸还原酶活性;在+CPA的基质中,CPA提高了玉米苗P含量以及吸收量,适量的CPA浓度还能够提高玉米苗的生物量,CPA显著降低AM真菌的感染率,接种AM真菌后的玉米苗生物量与不接种的相似甚至更低,玉米苗养分吸收、硝酸还原酶 ...
邢睿 +4 more
doaj
Conception and practice of resource utilization, energization and functionalization of coal mining subsidence areas with high groundwater level [PDF]
Underground coal mining often leads to surface subsidence and water accumulation, changes in the ecological environment, as well as in the spatial pattern of land and water resources, in high groundwater level mining areas.
Liang YUAN, Liangji XU
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