The natural logarithm of zinc-α2-glycoprotein/HOMA-IR is a better predictor of insulin sensitivity than the product of triglycerides and glucose and the other lipid ratios

AimThe euglycemic-hyperinsulinemic clamp (EHC) is not available in most clinical settings and is costly, time consuming and invasive, and requires trained staff. Therefore, an accessible and inexpensive test to identify insulin resistance (IR) is needed. The aim of this study is to assess whether zinc-α2-glycoprotein (ZAG) index [Ln ZAG/homeostasis model assessment of IR (HOMA-IR)] is a better surrogate index for estimating IR or metabolic syndrome (MetS) compared with other surrogate indices.MethodsWe performed a population-based cross-sectional study. Two hundred healthy subjects, 102 polycystic ovary syndrome (PCOS) patients, 97 newly diagnosed type 2 diabetes mellitus (nT2DM) and 84 impaired glucose tolerance (IGT) subjects were enrolled. The EHC was performed to identify IR. Circulating ZAG and adiponectin levels were determined by ELISA.ResultsThe ZAG index was significantly lower in participants with IR including IGT, nT2DM and PCOS than in those without IR. In addition, subjects with MetS had lower ZAG indices and higher the product of fasting triglycerides and glucose (TyG) indices than those without MetS. The ZAG index showed a significantly stronger association with M values than the other surrogate indices, whereas the TyG index showed a stronger association with MetS. The optimal cutoff value of the ZAG index for detection of IR was 2.97 with a sensitivity of 88% and a specificity of 91%, whereas the optimal cutoff value of TyG index for detection of MetS was 4.90 with a sensitivity of 82% and a specificity of 86%.ConclusionThe ZAG index is a better marker than the other surrogate indices for identifying IR, whereas the TyG index has high sensitivity and specificity for identifying MetS.     

Índice triglicéridos y glucosa: un indicador útil de insulinorresistencia

IntroductionInsulin resistance assessment requires sophisticated methodology of difficult application. Therefore, different estimators for this condition have been suggested. The aim of this study was to evaluate the triglycerides and glucose (TyG) index as a marker of insulin resistance and to compare it to the triglycerides/HDL cholesterol ratio (TG/HDL-C), in subjects with and without metabolic syndrome (MS).Material and methodsAn observational, cross-sectional study was conducted on 525 adults of a population from Bahia Blanca, Argentina, who were divided into two groups: with MS (n = 89) and without MS (n = 436). The discriminating capacities for MS of the TyG index, calculated as Ln (TG [mg/dL] x glucose [mg/dL]/2), and the TG/HDL-C ratio were evaluated. Pre-test probability for MS was 30%.ResultsThe mean value of the TyG index was higher in the group with MS as compared to the group without MS and its correlation with the TG/HDL-C ratio was good. The cut-off values for MS in the overall population were 8.8 for the TyG index (sensitivity = 79%, specificity = 86%), and 2.4 for the TG/HDL-C ratio (sensitivity = 88%, specificity = 72%). The positive likelihood ratios and post-test probabilities for these parameters were 5.8 vs 3.1 and 72% vs 58% respectively. The cut-off point for the TyG index was 8.8 in men and 8.7 in women; the respective values for TG/C-HDL were 3.1 in men and 2.2 in women.ConclusionsThe TyG index was a good discriminant of MS. Its simple calculation warrants its further study as an alternative marker of insulin resistance.     

COVID-19 May Increase the Risk of Insulin Resistance in Adult Patients Without Diabetes: A 6-Month Prospective Study

ObjectiveDuring the coronavirus disease 2019 (COVID-19) pandemic, exploring insulin resistance and beta-cell activity is important for understanding COVID-19‒associated new-onset diabetes. We assessed insulin sensitivity and fasting insulin secretion in patients with COVID-19 without diabetes on admission and at 3 and 6 months after discharge.MethodsThis 6-month prospective study assessed data from the records of 64 patients without diabetes diagnosed with COVID-19 at Wenzhou Central Hospital, China. Each patient was followed up at 3 and 6 months after discharge. Repeated measures analysis of variance was used to investigate differences in multiple measurements of the same variable at different times. Linear regression analysis was performed to analyze the contributor for changes in the triglyceride-glucose (TyG) index.ResultsFasting C-peptide levels in patients at baseline were lower than the normal range. Compared with the baseline results, patients had significantly elevated fasting C-peptide levels (0.35 ± 0.24 vs 2.36 ± 0.98 vs 2.52 ± 1.11 μg/L; P < .001), homeostasis model assessment for beta-cell function (0.42, interquartile range [IQR] 0.36-0.62 vs 2.54, IQR 1.95-3.42 vs 2.90, IQR 2.02-4.23; P < .001), and TyG indices (8.57 ± 0.47 vs 8.73 ± 0.60 vs 8.82 ± 0.62; P = .006) and decreased fasting glucose levels (5.84 ± 1.21 vs 4.95 ± 0.76 vs 5.40 ± 0.68 mmol/L; P = .003) at the 3- and 6-month follow-up. Male gender, age, interferon-alfa treatment during hospitalization, and changes in total cholesterol and high-density lipoprotein levels were significantly associated with changes in the TyG index.ConclusionOur study provided the first evidence that COVID-19 may increase the risk of insulin resistance in patients without diabetes.     

四川盆周低山暴雨区不同配置模式水土保持林生物多样性分析

用物种多样性指数(Shannon-Wienner指数、Simpson指数)、均匀度指数(Pielou)和物种丰富度指数(Margalef指数和Menhinick指数)对广元市7种人工森林群落进行多样性分析。结果表明,植被恢复与重建使生物多样性提高的同时,土壤侵蚀模数比治理前下降了45%;乔、灌、草复层经营对生物多样性与水土保持效益具有同样的贡献;水土保持效益因不同森林群落的生物多样性而异。     

松突圆蚧虫口数量与危害程度的关系

通过大面积的野外调查研究。结果表明：松突圆蚧每针束平均虫口数量（a）、针束最高虫口数量（b）、有虫针束率（c）和危害程度（d）4个指标之间均呈显著或极显著正相关。在野外虫口数量调查中可用针束最高虫口数量替代每针束平均虫口数量指标,以有虫针束率指标作为每针束平均虫口数量和针束最高虫口数量的有效参考指标。在危害程度的调查中,可用有虫针束率作为替代指标,以针束最高虫口数量和每针束平均虫口数量分别作为第1和第2参考指标。3个虫口数量指标中以有虫针束率对危害程度的直接作用最大,其次是针束最高虫口数量,每针束平均虫口数量最低。在间接作用中,针束最高虫口数量通过有虫针束率对危害程度的影响最大,每针束平均虫口数量通过有虫针束率的间接影响较大。     

中国人的头面部形态特征

目前,中国人群头型、面型、鼻型、唇型、耳型尚未见大样本的资料报道。我们测量了中国115个族群的63449例头面部指标值,计算了头长宽指数等7项指数值,进行了指数与年龄的相关分析、年龄组间的方差分析,以及指数与纬度、年平均温度的相关分析。采用主成分分析方法研究了7个年龄组指数值。相关分析显示,随着年龄增长,中国人头型变得更长一些,更低一些;面变得更窄一些,鼻翼更宽一些,唇更薄些,耳变得更细长些。主成分分析结果也证实了这种规律。相关分析结果表明,随纬度的增大,中国人男性、女性头长宽指数、形态面指数值增大,鼻指数、容貌耳指数值减小。随年平均温度的升高,中国人男性、女性头面部头长宽指数、头长高指数、形态面指数值减小,鼻指数、容貌耳指数值增大。中国人头长宽指数的圆头型率、中头型率较高。男性、女性头长高指数均以高头型为主,头宽高指数均以狭头型率最高,形态面指数以超狭面型率最高。超过一半的人鼻指数为中鼻型,其次为狭鼻型。     

Evaluation of groundwater quality using water quality index and its suitability for assessing water for drinking and irrigation purposes: Case study of Sistan and Baluchistan province (Iran)

The present study evaluates the groundwater quality for drinking and agricultural purposes and determines physicochemical characteristics of groundwater in the Sistan and Baluchistan province in Iran. In order to investigate the water quality, sampling was done in 654 open dug wells, the chemical parameters were analyzed, and water quality index was determined. In this regard, Langelier saturation index (LSI), Ryznar Stability index (RSI), Puckorius scaling index (PSI), Larson–Skold index (LS), and Aggressiveness index (AI) were considered to determine water suitability for industrial purposes. Finally, the analytical results were taken to generate the numerical spatial distribution of the parameters using the geographic information system (GIS) environment. According to the results, water sources were less corrosive based on AI and PSI, low and light corrosion according to RSI, and corrosion according to the Larsson–Sckold index. The results of the drinking water quality index showed that 1.2% shared extraction wells were classified as excellent, 52.1% as good, 39% as poor, 6% as very poor, and 1.7% as unsuitable for drinking purpose classes. In addition, irrigating water quality index illustrated that 19.9% and 80.1% wells were placed in the “excellent” and “Good” classes, respectively. Also, the quality of water in this study was categorized as brackish.     

QSAR study on solubility of alkanes in water and their partition coefficients in different solvent systems using PI index

The aqueous solubility (S(w)) of liquids and solids, expressed as log S(w) as well as their partition coefficients in different solvent systems viz. P(oct) (partition coefficient in octanol-water), P(16) (partition coefficient in water-hexadecane), P(alk) (partition coefficient in water-alkane), and P(cyc) (partition coefficient in water-cyclohexane), and aqueous solubility (S(w)) have been estimated using the PI (Padmakar-Ivan) index and the results compared with those obtained using the widely used Wiener index (W). Regression analysis of the data using n-alkanes show that the PI index gives better results than the W index.     

鄂尔多斯沙地不同退牧年限植物群落多样性及变异性研究

根据内蒙古鄂尔多斯退牧还草工程近30年的12个样地植被数据,将其按植被盖度分为半流动沙地(退牧5～10年)、半固定沙地(退牧15～20年)和固定沙地(退牧25～30年),以空间代替时间顺序采用α多样性指数(Simpson指数、Shannon-Wiener指数和Pielou指数)以及β变异性Sorenson指数的方法,分析了退牧年限与沙地植被群落多样性和变异性的关系.结果表明:(1)退牧20年为群落敏感期,Simpson指数和Shannon-Wiener指数在退牧30年间变化趋势相近,均匀度Pielou指数变化幅度较大,退牧15年物种分布最均匀,退牧20年时均匀度最小且随退牧年限先上升后下降;(2)草本层在退牧5～10年中Shannon-Wiener指数(0.99)和Pielou均匀度指数(1.25)较高,退牧15～20年后草本层逐渐被灌木半灌木层替代;(3)退牧5～20年的半流动与半固定沙地群落变异性大,退牧20～30年群落变异性相对较小;退牧5～20年,当地优势种油蒿(Artemisia ordosica)种群和羊柴(Hedysarum laeve)种群变异系数相近约为1.2,退牧30年左右油蒿变异系数是羊柴2倍多且油蒿种群发展较快.研究表明,退牧5～10年敏感期需禁牧管理,退牧15年灌木丛多样性和优势性较稳定宜采取轻度放牧管理,退牧30年左右,油蒿种群与羊柴种群种间竞争加剧,且前者有替代后者的趋势,管理时应注意防止群落组成结构单一化.     

土壤微生物群落对麻栎-刺槐混交林凋落物分解的影响

以麻栎-刺槐混交林和麻栎纯林为研究对象,采用野外定点采样、室内分析与高通量测序的方法,对凋落物分解过程中土壤微生物菌群多样性特征及其对凋落物分解速率的影响进行了研究。结果表明:(1)麻栎-刺槐混交林凋落物的分解速率高于麻栎纯林。两种林分凋落物有机碳(TOC)、全氮(TN)发生释放,全磷(TP)发生积累-释放的过程。(2)两种林分土壤细菌优势类群为放线菌门(Acidobacteria)、变形菌门(Proteobacteria)、酸杆菌门(Actinobacteria)和疣微菌门(Verrucomicrobia),土壤真菌优势类群为担子菌门(Basidiomycota)、子囊菌门(Ascomycota)和被孢霉门(Moritierellomycota)。(3)凋落物分解过程中,麻栎-刺槐混交林土壤微生物菌群丰富度指数和菌群多样性指数变化范围小于麻栎纯林。(4)凋落物分解速率与土壤细菌菌群丰富度指数和菌群多样性指数呈显著正相关,与土壤真菌菌群丰富度指数呈显著正相关。土壤微生物群落对麻栎-刺槐混交林和麻栎纯林凋落物分解速率具有重要影响,研究结果为深入开展混交林土壤微生物多样性对凋落物分解的影响研究提供理论依据。     

秦岭火地塘林区华山松人工林与天然次生林群落特征比较

采用样地调查法对秦岭火地塘林区处于中龄阶段的华山松人工林与天然次生林群落特征进行比较研究.结果表明:(1)华山松天然次生林群落有维管束植物38科64属82种,人工林群落有维管束植物30科55属71种,两个群落共有种为53种,相似系数为0.55.(2) 华山松人工林群落灌木层和草本层的Maglef指数、Simpson指数、Shanon-Wiener指数和Pielou均匀度指数与天然次生林群落无显著差异,但人工林乔木层的4个多样性指数显著低于次生林.人工林的4个多样性指数表现为灌木层＞草本层＞乔木层的规律,天然次生林表现出灌木层＞乔木层＞草本层的规律.(3)在生活型谱上,人工林与次生林的高位芽、地上芽、地面芽、地下芽和一年生草本的差异均不显著,但是天然次生林的中小高位芽植物比例显著高于人工林,矮高位芽植物相反.(4)在垂直结构上,天然次生林乔木层的树种组成和灌木层的天然更新幼苗量较人工林丰富,两个群落乔木层华山松种群的平均高度以及乔灌草三层的盖度无显著差异.(5)在水平结构上,人工林华山松种群的空间分布格局为均匀分布,胸径一致,为纯林;天然次生林华山松种群空间分布格局为聚集分布,与华椴和锐齿栎等树种水平镶嵌,形成异龄混交林.(6)天然次生林群落的自然构成系数为3.20,顶极树种比例为34.7%,人工林群落的自然构成系数为1.49,顶极树种比例为22.7%,两个群落差异极显著,且天然次生林群落处于先锋群落的中后期阶段,人工林群落尚处于先锋群落的初期阶段.研究表明,经过40年的恢复,两个群落整体上已具有一定程度的相似性,物种组成已比较接近,灌木层和草本层已无显著差异,两者主要差异在乔木层和演替状态上,天然次生林乔木层树种丰富,群落演替速度较人工林快.     

Morphological and Stress Vulnerability Indices for Human Coronary Plaques and Their Correlations with Cap Thickness and Lipid Percent: An IVUS-Based Fluid-Structure Interaction Multi-patient Study

Plaque vulnerability, defined as the likelihood that a plaque would rupture, is difficult to quantify due to lack of in vivo plaque rupture data. Morphological and stress-based plaque vulnerability indices were introduced as alternatives to obtain quantitative vulnerability assessment. Correlations between these indices and key plaque features were investigated. In vivo intravascular ultrasound (IVUS) data were acquired from 14 patients and IVUS-based 3D fluid-structure interaction (FSI) coronary plaque models with cyclic bending were constructed to obtain plaque wall stress/strain and flow shear stress for analysis. For the 617 slices from the 14 patients, lipid percentage, min cap thickness, critical plaque wall stress (CPWS), strain (CPWSn) and flow shear stress (CFSS) were recorded, and cap index, lipid index and morphological index were assigned to each slice using methods consistent with American Heart Association (AHA) plaque classification schemes. A stress index was introduced based on CPWS. Linear Mixed-Effects (LME) models were used to analyze the correlations between the mechanical and morphological indices and key morphological factors associated with plaque rupture. Our results indicated that for all 617 slices, CPWS correlated with min cap thickness, cap index, morphological index with r = -0.6414, 0.7852, and 0.7411 respectively (p<0.0001). The correlation between CPWS and lipid percentage, lipid index were weaker (r = 0.2445, r = 0.2338, p<0.0001). Stress index correlated with cap index, lipid index, morphological index positively with r = 0.8185, 0.3067, and 0.7715, respectively, all with p<0.0001. For all 617 slices, the stress index has 66.77% agreement with morphological index. Morphological and stress indices may serve as quantitative plaque vulnerability assessment supported by their strong correlations with morphological features associated with plaque rupture. Differences between the two indices may lead to better plaque assessment schemes when both indices were jointly used with further validations from clinical studies.     

北京市森林生态安全预警时空差异及其驱动机制

主要探讨森林生态安全预警指数演化的时空格局变化及其驱动力机制,以期为推进北京市森林生态安全决策提供理论参考。基于森林生态安全预警指标体系,运用SD模型从区县尺度对北京市2009—2015年森林生态安全预警的时空差异进行分析,并对2015—2030年森林生态安全演变趋势进行预测。结果表明:(1) 2009—2030年,北京市森林生态安全整体呈改善态势。其中,2009—2015年,北京市森林生态安全预警指数呈略有下降态势,但下降速度有限; 2016—2030年,预警指数呈上升趋势。(2)各区县内部差异显著,5个区县的森林生态安全预警指数有所下降,其中海淀区下降幅度最大。2016—2030年,各区县中除海淀区外,预警指数均小幅上升,森林生态安全状况有所改善;但石景山区仍为巨警,海淀和朝阳区为重警。(3)空间上,森林生态安全预警指数从功能拓展区到城市发展新区及生态涵养区,呈现出由低到高的变化趋势,其低值区随着城市化进程的加快而逐渐扩大。生态涵养区的森林生态安全状况明显优于其他地区,发展新区的森林生态安全改善显著,功能区个别地区则有退化迹象。(4)北京市森林生态安全预警指数时空演变特征主要受森林资源、社会经济、自然环境和林业政策等多种因素的综合影响,因而出现森林生态安全演进的阶段性及其区域性差异。     

戴云山物种多样性与系统发育多样性海拔梯度分布格局及驱动因子

生物多样性的海拔分布格局是生态学研究的热点。海拔作为综合性因子驱动着植物群落的物种、系统发育与功能多样性的空间分布。以戴云山南坡900-1600 m森林植物群落为研究对象,探讨物种多样性、系统发育指数与环境驱动因子的相互关系以及环境因子在群落构建与多样性维持中的重要意义。结果表明：（1）森林植物群落的系统发育多样性与物种多样性沿海拔均呈现中间高度膨胀格局。（2）物种多样性Margalef指数、Shannon-Wiener指数与系统发育多样性指数呈显著正相关,表明物种多样性越高,系统发育多样性也越高。Shannon-Wiener指数与物种多样性指数（Margalef、Pielou、Simpson指数）、系统发育多样性及系统发育结构都存在显著相关性,一定程度上Shannon-Wiener指数可以代替其他指数。Pielou指数、Simpson指数、Shannon-Wiener指数与系统发育结构NRI （Net relatedness index）指数、NTI （Net nearest taxa index）指数存在显著正相关,表明群落优势度、均匀度与系统发育结构相关性较强。（3）土壤全磷含量是影响系统发育多样性和物种多样性的主要驱动因子,土壤含水量是影响Shannon-Wiener、Pielou、Simpson指数的最显著因子,海拔是影响群落系统发育结构的主要因素。海拔是影响系统发育结构变化的主要环境因子,而土壤因子是影响物种多样性与系统发育多样性的主要因素,进一步验证了物种多样性与系统发育多样性的高度相关,结果旨在揭示物种群落空间分布规律。     

Protein creatinine index and Albustix in assessment of proteinuria.

The protein creatinine index in early morning and random urine specimens was compared with the 24 hour urinary excretion of protein in normal subjects and outpatients with abnormal proteinuria. A protein creatinine index (defined as (mg protein/1 divided by creatinine mmol/1) times 10) below 125 in a random specimen excluded abnormal proteinuria, whereas an index of more than 136 indicated the presence of pathological proteinuria. The index for random specimens provided a useful semiquantitative assessment of the 24 hour excretion of protein (mg protein/24 hours), but the index for early morning specimens was less reliable. Errors with Albustix were partly due to intra and inter observer variations in the interpretation of the colour formed when compared with the chart provided. It is proposed that the protein creatinine index on random urine samples should be used to supplement dipsticks in screening for proteinuria in cases where misclassification would be serious.     

草莓种苗壮苗指数模型的构建与质量评价

随着我国草莓栽培面积逐年增加,草莓种苗需求量越来越大,为了确保种苗育苗质量,亟需开展壮苗评价的研究。本研究以生长40 d的‘红颜’穴盘苗为对象,在测定地上部和地下部生长、鲜重、干重等16项指标的基础上,分别构建单项指标隶属函数,使用加权模糊评判法计算种苗综合评价指数;利用主成分分析筛选的关键指标组成多个壮苗指数模型,与种苗综合评价指数进行相关性分析后,确定最佳草莓壮苗指数模型并进行验证。结果表明: 随机选取的320株草莓种苗16项指标存在显著差异,综合评价指数为0.165～0.817,可作为壮苗指数模型构建和种苗质量评价的依据。主成分分析将16项指标划分为地上部相关指标、地下部相关指标和色素指标3个主成分,累计贡献率达到79.7%;从每个主成分中选择贡献值最大的3个指标随机组成27种壮苗指数模型,通过相关性分析筛选出与综合评价指数相关性最大的5个壮苗指数模型,其中“地上干重×根系表面积×叶绿素a”的相关性最高,用‘红颜’、‘香野’和‘甜查理’种苗验证相关系数均最大,分别为0.879、0.924和0.975,确定可作为草莓壮苗指数计算模型。以综合评价指数为种苗质量分级依据,可将种苗健壮程度分为3个等级:等级Ⅰ(综合评价指数≥0.5,壮苗指数≥4.0)为优质苗,等级Ⅱ(综合评价指数0.3～0.5,壮苗指数0.5～4.0)为合格苗,等级Ⅲ(综合评价指数≤0.3,壮苗指数≤0.5)为弱苗。研究结果可为草莓或其他种苗壮苗指数计算和种苗健壮程度评价提供理论依据与科学方法。     

高光谱植被指数与水稻叶面积指数的定量关系

基于不同水稻品种、施氮水平和不同生育期下的大田试验,确立了水稻叶面积指数（LAI）与冠层光谱特征参数的定量关系.结果表明：水稻叶面积指数与部分高光谱植被指数存在良好的相关性,其中原始光谱组成的2波段差值指数（DI）形式相关性最好,其次为比值（RI）和归一化（NI）植被指数.相关最好的原始光谱植被指数是由近红外波段组成的差值指数DI(854,760),相关最好的一阶导数光谱植被指数是红光和近红外光组成的导数差值指数DI(D₆₇₆, D₇₇₈),但总体上导数光谱指数不如原始光谱指数与LAI关系密切.独立试验数据检验结果表明,以差值指数DI(854,760)为变量建立的水稻LAI监测模型具有较好的表现,可用于水稻LAI的估测.     

不同海拔高度对健康成年男性心脏血流动力学和心电图的影响

目的:监测中国南极冰盖考察预选队员心血管系统随海拔增高的变化,探讨筛查低氧易感队员和急性高原病的防治。方法:用无创血流动力学监护仪和十二导联心电图机,在北京(40 m)、拉萨(3 650 m)、羊八井(4 300 m)对第25次和26次南极冰盖考察预选队员心血管功能进行连续动态性监测。结果:随着海拔的增高,心率、收缩压、舒张压、平均动脉压、外周血管阻力、外周血管阻力指数显著升高(P0.05),心输出量、心指数、搏出量、搏出指数、加速度指数、速度指数、左心射血时间显著降低(P0.05),预射血期呈降低趋势(P0.05)。结论:随着海拔的增高,预选队员的外周血管阻力显著升高,左心泵血和收缩功能减弱且与Q-TC间期呈负相关。     

福建漳州市香蕉园土壤重金属污染调查分析

调查福建省漳州市香蕉园土壤重金属Cd、Pb、Hg、Cr、Cu及非重金属有害元素As含量,并采用单项污染指数法和综合污染指数法进行评价。结果表明,以福建土壤背景值为评价标准,漳州市部分香蕉园土壤受到重金属污染,单项污染指数的顺序为Hg(1.60)> Pb(1.26)> Cd(1.07)> Cu(0.76)> As(0.50)> Cr(0.38),污染元素主要为Cd、Pb、Hg,其中Cd、Hg为中度污染;综合污染指数为1.16,属轻度污染。而以土壤环境质量二级标准为评价标准,其综合污染指数为0.34,表明未受污染。对不同取样点土壤重金属污染情况比较分析,说明道路交通、生活垃圾及生活污水均会造成香蕉园土壤不同程度的重金属污染,主要表现为Cd、Pb、Hg的污染。     

芦芽山荷叶坪亚高山草甸生物多样性

以芦芽山荷叶坪亚高山草甸为研究对象,共设置150个5 m×5 m草本样方,进行群落生物学调查,对研究区36种草本植物重要值、α多样性指数、谱系多样性指数及其相关性进行研究.结果表明: 荷叶坪亚高山草甸物种多样性总体分布较均匀,边缘地区物种更丰富,呈现“边缘效应”;4个样地的群落谱系结构呈聚集模式,12个样地的群落谱系结构呈分散模式;谱系多样性指数(PD)与Petrick指数、Simpson指数和Shannon指数呈正相关,净亲缘关系指数(NRI)和最近种间亲缘关系指数(NTI)与α物种多样性指数无明显相关性.