草本层

群落的结构层次可分为乔木（I、II）层、灌木层和草本层；

The structure of communities is complex which can be divided into tree layer ( I , II ), shrub layer and herb layer .

但在H′、D、PIE、J（sw）和J（si）方面，表现为：草本层＞乔木层＞灌木层。

Whereas , for H ' , D , PIE and Jsw , it is herb layer > tree layer > shrub layer .

对防护林草本层物种多样性指数与土壤肥力因子的关系研究表明：影响草本层物种多样性的主要因子是土壤PH值，其次是土壤全磷含量。

Study on the relationship between soil fertility properties and species diversity in grass layer showed that the main factor affecting species diversity was soil PH , then was the soil total phosphorus .

对祁连山不同类型条件下的祁连圆柏群落生物量和营养元素积累量的测定结果表明：祁连圆柏群落生物量为231.20t／hm2，其中乔木层占98.34%，灌木层占1.60%，草本层占0.06%；

Biomass and nutrient element accumulation of Sabina przewalskii forest community of different types were measured in the Qilian Mountains .

草本层最小取样面积动态主要受S的影响，而乔、灌木层的最小取样面积变化则与J紧密相关。

The minimum sample area of the herb stratum is mainly affected by S but those of the tree and shrub stratum are mainly affected by J.

草本层丰富度、Shannon-Wiener指数和Simpson指数都大于灌木层。

The Richness of herb layer , Shannon-Wiener index and Simpson index were higher than shrub layer . 6 .

2）处于亚顶极阶段的森林群落各层次多样性指数（D和H′）特征是乔木层<草本层<灌木层；

2 ) communities at the sub climax stage also showed different trends in diversity among layers & diversity indices ( D and H ′) were lowest in the tree layers followed the herb and shrub layers sequentially ;

乔木层、灌木层和草本层植物的β多样性（Cody指数）均随着海拔的升高而下降。

β diversity , indicated by the Cody index , declined with increasing altitude for all three layers .

草本层密度较大，以堇菜科Violaceae，蔷薇科Rosaceae和菊科Compositae种类为主；

Main species of herb included Violaceae , Rosaceae and Compositae with higher density .

在上述3项中，除NO3-N、Fe、Zn外，草本层滴透水中其它养分元素的富集作用都强于其它2项。

Element enrichment except that of NO_3-N , Fe and Zn was stronger in the dripping of herb layer than in the through-fall of canopy and shrub layer .

群落结构较为简单；物种多样性指数（Shannon-Wiener指数）以草本层最高，为36673。

Vertical structure of community was simple , The Shannon-Wiener diversity index of herbage layer was 3.6673 in the community .

乔木层和灌木层的α多样性（ShannonWiener指数）呈下降趋势，草本层则变化不明显；

With increasing altitude , α diversity , represented by the Shannon-Wiener index , decreased for both tree and shrub layers , with no clear trend for herb layer .

利用双向指示种分析法（TWINSPAN）和除趋势对应分析（DCA）对昆嵛山不同林分类型下的灌木层和草本层进行了数量生态学分析。

The TWINSPAN classification and DCA ordination were employed for the quantitative analysis of the shrub layer and herbage layer under different stands .

林冠层穿透水和灌木层穿透水中Fe，草本层滴透水中Fe、Zn为负淋溶，其余各元素浓度有所增加。

The Fe concentration in the through-fall of canopy and shrub layer as well as the Fe and Zn concentrations in the dripping of herb layer were lower , while the concentrations of other elements were higher than those in the rainfall .

草本层中，发育3a的群落，总体联结性表现出极显著正相关，但种间关系不够稳定；

In the herbaceous layer of 3 a communities , the overall connectivity appeared to be a significant positive correlation but the interspecific relations were not stable enough ;

通过广义线性模型（generalizedlinearmodels，GLM）拟合了草本层物种丰富度与地形因子、土壤因子以及地形相对湿度指数（TRMI）之间的关系。

The species richness of herb layer was fitted in the topographic and soil feature factors , as well as the topographic relative moisture index ( TRMI ) by the generalized linear models ( GLM ) .

演替期间，各层S稳定增加灌木层和草本层建立初期J较高，H与S呈正相关，以后J下降，H却与J呈负相关，乔木层H始终与J呈正相关。

J is higher and H is associated positively with S at the initial phase of the shrub and herb strata , and later J decreases and H relates to J positively . However , H of tree stratum is always not negatively correlated to J.

平均不含灰分热值（AFCV）从低到高依次是草本层（18.55KJ／g）、灌木层（19.72KJ／g）、乔木层（21.19KJ／g）。

The ash free calorific value ( AFCV ) was the highest in the tree layer , the second highest in the shrub layer and the lowest in herbaceous layer . They were 21.19, 19.72 and 18.55 KJ / g , respectively .

乔木层和灌木层的Shannon-Wiener指数和Pielou指数均是随海拔的上升而下降，且草本层的变化趋势不明显。

Both Shannon-Wiener index and Pielou evenness index in the tree and shrub layers showed downward change with increasing altitude , with no clear trend for herb layer .

从乔木层、灌木层到草本层，灰分含量依次增加，GCV和AFCV则依次降低。

The mean ash content increased in an order from tree layer , shrub layer to herb layer , while those of GCV and AFCV decreased .

随着森林的发育，灌木和草本层动态是现复杂的变化。

The modeled dynamics of shrubs and herbs were more complex .

随着植被演替的进行，林下草本层地上生物量总体降低。

The herb layer biomass is overall reduction through the succession .

灌木层一乔木层一草本层物种多样性依次递减。

The species diversity decreases from shrub , tree to herb layer .

林内草本层植物种类和数量增加。

Species and quantity of herbaceous plants in the forest are increased .

草本层1.305t/ha。

And herb layer 1 . 305t / ha .

草本层的养分含量高于乔木层的养分含量。

Nutrient content of grass layers is higher than that of tree layers .

乔木层、灌木层和草本层的物种多样性较低。

All the three layers had low species diversity .

而草本层物种多样性主要受生境条件影响，林隙使群落草本层均匀度下降。

But the field layer species diversity was mainly influenced by the habitat .

群落垂直结构简单，分层不明显，只分为灌木层和草本层，并有少量的层间植物。

The community structure is simple , having only shrub and herb layers .

群落垂直结构复杂，草本层发育；

The vertical structure of the community is complex ;