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蒙古栎次生林的生长更新与林下植被多样性对林分密度的响应 被引量:30
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作者 胡延辰 张晓林 +3 位作者 韩晓义 万小亮 梁泰铭 陆秀君 《应用生态学报》 CAS CSCD 北大核心 2022年第3期727-732,共6页
以辽宁省抚顺市清源县蒙古栎天然次生林为对象,在2018年对6块面积为0.1 hm^(2)的蒙古栎样地进行疏伐,并于2020年调查样地内植被的生长情况,研究疏伐后形成的600(低密度)、720(中密度)、900株·hm^(2)(高密度)3种密度对林木生长、林... 以辽宁省抚顺市清源县蒙古栎天然次生林为对象,在2018年对6块面积为0.1 hm^(2)的蒙古栎样地进行疏伐,并于2020年调查样地内植被的生长情况,研究疏伐后形成的600(低密度)、720(中密度)、900株·hm^(2)(高密度)3种密度对林木生长、林下实生苗更新与林下植被多样性的影响。结果表明:由于疏伐后间隔年份较短,不同密度下树高、胸径无显著差异。但低密度下林冠对称指数显著高于高密度,表明树冠生长对于林分密度的响应比树干生长更迅速。中密度下实生更新苗数量最多,且相同苗高的实生苗地径显著高于其他两个密度,中密度下实生苗更新与幼苗生长都好于高、低密度。林中共有植物70种,隶属于41科67属,其中木本植物蒙古栎、胡枝子与草本植物山罗花、三叶委陵菜占优势地位。灌木层与草本层的优势度指数、均匀度指数和多样性指数在中密度下表现最佳,表明该立地条件下林分密度保持在720株·hm^(2)时更有助于辽东山区蒙古栎次生林的可持续发展。 展开更多
关键词 林分密度 蒙古栎 天然更新 物种多样性
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Change of Hs-CRP level and its clinical features in elderly patients with metabolic syndrome 被引量:3
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作者 WU Qing-qing LI Chen +5 位作者 ZHENG Yun-yi BAI Shu-chang XIA Zhang-qing wan xiao-liang MA Guan-hai LIANG Jian-qiu 《South China Journal of Cardiology》 CAS 2019年第3期156-162,共7页
Background Elevated serum Hs-CRP level may be an independent predictor of metabolic syndrome(MS)in healthy individuals. Many elderly patients have metabolic syndrome. Therefore,we observed the clinical features of ser... Background Elevated serum Hs-CRP level may be an independent predictor of metabolic syndrome(MS)in healthy individuals. Many elderly patients have metabolic syndrome. Therefore,we observed the clinical features of serum Hs-CRP level in elderly patients with metabolic syndrome to further understand the relationship between the two. Methods A total of 210 patients were divided into two groups:metabolic syndrome(MS,n=1112)group and non-metabolic syndrome(Non-MS,n=98)group. The serum Hs-CRP level was tested by immunoturbidimetry and the clinical features of Hs-CRP were analyzed. The associations of Hs-CRP with BMI,WHR,FBG,TG,TC,LDL-C,HDL-C,SBP,DBP and Homa-IR were determined. Results Serum HsCRP level was significantly higher in the MS group than in the non-MS group(P<0.05). Besides,with the increase in the number of included factors,the level of Hs-CRP gradually increased significantly(P<0.05).Moreover,serum Hs-CRP was positively correlated with age,BMI,WHR,SBP,DBP,FPG,FIN,TG,TC,Homa-IR(r=0.38,0.49,0.33,0.36,0.31,0.34,0.43,0.37,0.18,0.34,respectively,P<0.05)and negatively correlated with HDL-C(r=-0.37,P<0.001). Conclusion Serum Hs-CRP level is associated with many factors. It is a proactively marker for cardiovascular disease risk assessment of elderly MS patients.[S Chin J Cardiol 2019;20(3):156-162] 展开更多
关键词 METABOLIC SYNDROME high sensitive C-reactive protein CARDIOVASCULAR disease INFLAMMATION
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