Results 61 to 70 of about 14,547 (112)

气候条件对黄土高原水土保持植被结构的影响及其在植被建设中的意义

Shuitu Baochi Xuebao, 2004
以黄河流域的资料为基础,运用数理统计的方法将描述水土保持植被结构的指标与气候指标相联系,揭示了气候条件对黄土高原水土保持植被结构的影响,在此基础上提出对乔木面积与乔灌草总面积的比率是否合理进行评价的方法。研究表明,年降水量是影响水土保持植被结构的最重要气候因素,乔木、灌木和草地与乔灌草总面积的比率与年降水量的相关系数的显著性水平均大大优于0.01。乔木、灌木和草地与乔灌草总面积的比率与年降水量的相关系数分别为0.72,-0.48,-0.47,逐渐减小,说明乔木、灌木和草类对降水的依赖程度逐渐减小 ...
许炯心
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砒砂岩区主要造林树种枯落物及林下土壤持水特性

Shuitu Baochi Xuebao, 2017
为了探究砒砂岩区不同造林树种水文特征，以该地区油松、侧柏、青杨、山杏、沙棘、柠条为研究对象，通过浸泡法和环刀法，对比分析了不同树种枯落物层和土壤层的持水特性。结果表明：砒砂岩区主要造林树种枯落物蓄积量变动范围为1.55~7.89 t/hm2，青杨林下枯落物最大持水率最高为281.26%，其他树种枯落物最大持水率依次为油松（217.14%）、侧柏（201.05%）、山杏（202.79%）、沙棘（170.96%）、柠条（158.08%）撂荒地（143.88%）。油松林下土壤层容重最小为1.46 g/cm3 ...
杨振奇, 秦富仓, 李晓琴, 刘力川, 牛晓乐   +4 more
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[Effect of rituximab combined with short-course glucocorticoid therapy on cellular immunity and cytokines in children with new-onset nephrotic syndrome]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Yuan TT, Zhu BB, Li Y, Zhang RF, Qiu S, Lyu J, Zhou SQ.   +6 more
europepmc   +1 more source

[A high temporal resolution dynamic T₂*W imaging study based on step oxygen stimulation of rat kidneys]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Sun S, Tao Q, Zhao K, Hu Q, Feng Y.
europepmc   +1 more source

[Application and advances of exosome-hydrogel system in wound healing]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Qiu Y, Tan Q.
europepmc   +1 more source

[Research progress on biologics and therapeutic drug monitoring in pediatric inflammatory bowel disease]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Pan TT, Yang HL, Zhou SH, Sun H.
europepmc   +1 more source

[Influence of porosity and Young's modulus of gelatin methacrylate anhydride hydrogels on the biological behavior of mouse bone marrow mesenchymal stem cells]. [PDF]

Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Kong Y, Tian F, Liu QH, Zhang C, Song W, Kong Y, Li Z, Jirigala E, Huang S.   +8 more
europepmc   +1 more source

[Research progress on toxic shock syndrome due to group A <i>Streptococcus</i> infection in children]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Wang HY, Zhou W, Huang LS.
europepmc   +1 more source

[How I treat vasovagal syncope in children]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Zou RM, Wang C.
europepmc   +1 more source

[Chain mediating role of family care and emotional management between social support and anxiety in primary school students]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Li ZW, Wei JH, Chen KB, Ruan XR, Wen YT, Zhou CL, Tang JP, Wang TT, Tan YQ, Qin JB.   +9 more
europepmc   +1 more source