物种多样性

The ecologicalcharacteristics of community structure, species diversity, its ecological effects on soil health,and eco-system functions of soil water holding capacities, water and soil conservation effectswere studied symmatically in Nverzhai watershed , which was the key experiment anddemonstration spot of the Yangtze River Proctction Fores.

针对长江中下游低山丘陵区土地退化现状和我国现阶段生态工程建设需求，以湘西北武陵山区女儿寨小流域为研究对象，研究了7种典型植被恢复模式的群落结构、生物量分配格局、物种多样性、土壤健康效应等生态学特征及水土保持、水源涵养等生态系统服务功能，具有重要的理论意义和应用价值。

The soil desiccation as a soil degradation is existed widely in the artificial forest of hot-dry river valley, for instance the simple community structure, the low plant species diversity and a long time - soil desiccation.

干热河谷现有的人工林植被普遍存在土壤干化的土壤退化形式，群落结构简单，植物物种多样性低，土壤水分长时间亏缺。

This suggests that the diversity indices of lianas might be employed to measure forest succession.

在没有人类干扰的条件下，随着群落演替的进行，藤本植物的物种多样性逐渐减少。

The individual number, species number and Shannon-Wiener index of lianas in ravine rain forest and riv...

因此在某些地区，可以将藤本植物物种多样性的高低作为衡量森林演替阶段的一个指标

The results showed that there were three major types of secondary forests, Fungshui wood, ravine wood, and early stage of secondary forest. Fungshui wood and Ravine wood had higher floristic diversity and are the precious forest relicts.

研究结果表明，珠海市山地森林群落类型主要有风水林、沟谷林和早期次生林，以风水林和沟谷林的物种多样性较高，它们是珠海市宝贵的森林遗产。

Quires:(1) the combination of laboratory microcosm study and field mesocosm experiments; and (2 ) the

野外控制实验；(2)结合物种多样性调查和不同功能群的功能分析。

The community structure and biodiversity are analyzed and compared with four main tropical forests in Hainan island basing on 6 quadrats in different altitude on Diaoluo Mountain.

根据吊罗山自然保护区不同海拔6个植物群落的样方资料，分析了吊罗山植物群落结构特征和物种多样性，同时比较了吊罗山植物群落与邻近地区植物群落的组成特征。

The main researching contents included as following:relationships betweenspecies diversity,community richness,vegetation succession,soil volume weight,solu-ble Na+concentration and five soil chemical elements(N、P、K、Ca、Mg)concentrationwith grazing intensities in the grassland.Relationships between concentrations,re-serve pools of plant nutrient materials,including five macroelements(N、P、K、Ca、Mg),crude protein,crude fibre,crude fat and total nonstructural carbohydrate,and their allocations in defferent plant parts with grazing intensities in thegrassland.Effects of grazing on Leymus chinensis population were also examined andthat more attentions were paid on the responses of many biological characteristics ofabove-and below-ground plant modules to different grazing intensities.Furthermore,in the respects of plant production,survival rate,tillering ability,total nonstructuralcarbohydrates content and others,the effects of one years different defoliationpatterns on the vitality of Leymus chinensis population were detected.

主要研究内容有：放牧对羊草草地植被和土壤的影响，致力于物种多样性、群落丰富度、植被演替和植物生产量、以及土壤容重、土壤水溶性Na+含量和五种土壤大量营养元素(N、P、K、Ca、Mg)的含量等土壤理化性状与放牧强度关系的分析，分析了不同放牧强度与羊草草地草群和羊草种群地上和地下各植物部分中多种营养物质的浓度、贮量及其分配的关系；放牧对羊草种群的影响，注重了羊草种群的地上与地下各植物器官对不同放牧强度的反应和适应性变化，最后，从植物生产量、存活率、分蘖能力以及总非结构性碳水化合物含量等方面，探讨了不同人为去叶方式组合对羊草种群当年和次年生活力的效应。

The composition and dynamias of analysis and appraise of maturalized plantation indictedthat PNT has improved the diversity and stability of the plantation,and the plantation has beenchanged into the mixed and uneven-aged naturalized stands.

对定向抚育与一般抚育及开拓林隙与未开拓林隙措施的研究表明：定向抚育提高乔木物种多样性和群落的稳定性，说明这两种措施推动和加速了人工林向混交、异龄、复层、优质天然化林分的转化。

This paper investigates over the change of species diversity of Pinus massoniana secondary plantation caused by its low-intensity surface fire.

采用样地调查法对低强度地表火干扰样地马尾松次生林的物种多样性进行了调查。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。