Results 111 to 120 of about 4,611 (154)

Benefit and Characteristics of Grass-Shrub Vegetation for Reducing Soil Erosion in Loess Hilly Region

open access: yes, 2003
利用人工模拟降雨 ,对白羊草和铁杆蒿草地 ,柠条和沙棘灌木林地以及对照区 (油松林地、裸地和农地 )的产沙及其特征进行试验研究。结果表明 ,影响侵蚀产沙的主要因子有下垫面、坡度、雨强和植被盖度等。草灌植被具有良好的保持土壤功能。不同地类产沙量大小依次为乔木林地 <灌木林地 <草地 <裸地 <农地 ,其宏观产沙比为 1∶2∶ 3∶ 5 0∶ 15 0 ,其产沙比视雨强和坡度而有变化。陡坡农地是侵蚀产沙的主要来源 ,退耕还林还草是保持水土和减少泥沙的有效措施 ...
吴钦孝, 赵鸿雁, 韩冰
core  

[Development of dynamic multi-time-point clinical prediction models for bronchopulmonary dysplasia in preterm infants with gestational age < 32 weeks]. [PDF]

open access: yesZhongguo Dang Dai Er Ke Za Zhi
Li W   +9 more
europepmc   +1 more source

[Guideline for the diagnosis and treatment of chronic myeloid leukemia in China (2025)]. [PDF]

open access: yesZhonghua Xue Ye Xue Za Zhi
Chinese Society of Hematology   +1 more
europepmc   +1 more source

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