查询词典 ecosystem

Agricultural ecosystem services play a key role in the sustainable development of mankind.

农业生态系统提供的服务对人类的可持续发展至关重要。

Once environmental damage is done,it takes many years for the ecosystem to recover.

对环境的破坏一旦造成，就需要很多年时间来恢复生态系统。

The processes included the establishment of databases and knowledge bases for forestland suitability analysis, the establishment of a decision support system of forestland classification by referring to the framework of ecosystem decision support system developed by the US Forest Service, and comparisons of forestland classifications between traditional binary and fuzzy logic approaches.

同时，为探讨林地分级决策支援系统所使用的模糊逻辑法和传统二分法对林地分级之影响，亦分别依据研拟的准则予以分析和比较。

Second, wetland landscape pattern dynamic change of Kenli County Take TM as the information source, according to studies the region wetland ecosystem present situation characteristic, wetland is divided into 10 kinds: irrigation paddy field, pit pond water surface, cultivation water surface, artificial ditch, reservoir water surface, salt field, rivers water surface, reed, shallow seas and tidelands, beach. The wetland landscape area is remarkable dropt from 1987 to 2004.In 1987 the wetland area occupied 14.10% of Kenli county, but only was 12.33% in 2004, it reduced 6155.12 hm2 in 17 years and average reduced 362.07 hm2 every year, the reduction scope of shallow seas and tidelands wetland is biggest 3894.78 hm2. The shallow seas and tidelands and reed are frequent transformation with other type.

2查清了研究区湿地景观格局动态变化规律以TM影像为信息源，根据研究区域湿地生态系统现状特征，把垦利县湿地分为10类；湿地景观面积在研究时段内呈显著下降趋势，1987年湿地面积占整个研究区总面积的14.10%，但到2004年只占12.33%，17年共减少6155.12 hm2，平均每年减少362.07 hm2，其中滩涂湿地面积减少幅度最大3894.78 hm2；从各湿地类型之间的转换来看，各种湿地景观之间、湿地和非湿地之间相互转化和逆转并存，滩涂和苇地与其他地类转换频繁；研究区湿地景观斑块数量增多，景观多样性指数1987年为1.7643，2004年下降到1.7105，均匀度指数由1987年的0.6873上升到2004年的0.6923。

Selecting in different ecosystem environment and long-term natures to mulberry tree with the artificial, it becomes many kind of varieties, mutations and species.

但是长期以来，在桑树植物的分类中由于对种和变种的概念具有不同的理解，以及原始材料的差异，传统的分类学提不出一个大家都接受的体系，因而划分的物种在某种程度上还有一定的人为性。

At the same time, they could upset the natural ecosystem if they escaped into the wild.

与此同时，如果它们逃到野外，也可能会干扰自然生态系统。

EVERY ecosystem has a cast of characters playing similar roles.

每个生态系统中都有一些类似的角色。

The native plants are crucial to the forest ecosystem, Rogers says, because they provide food for a host of other species, from wild turkeys to insects.

罗杰斯说，因为本土植物为从野火鸡到昆虫等等许多其他物种提供了食物，所以它们对森林的生态系统起着至关重要的作用。

Wetland is a unique ecosystem that has multi-function in the world, and is one of the most important living environments for human beings.

湿地是地球上具有多功能的、独特的生态系统，是人类最重要的生存环境之一。

Review the biotic and abiotic factors, lead to the definition of ecosystem.

复习上节课的生物与非生物因素，并引出生态系统。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。