草地

There are various reasons for grassland degradation, among which overgrazing is the main reason based on many researches both inland and abroad.

造成草地退化的原因是多方面的，国内外研究表明过度放牧是草地退化的主要原因。

In fact, current condition is mainly caused by artificial factors. Among the artificial factors, overgrazing is considered to be the foremost one.

在导致草地退化的诸多人为因素中，过度放牧被认为是造成草地退化的主要因素。

Research results indicated that the underground biomass changes of three species differed obviously under different traffic treatment. Poa pratensis and Zoysia japonica underground biomass increased at the light traffic then declined. 'Barlexas' Tall fescue decreased with increasing traffic stress. Obvious root shallowing phenomenon is displayed through the increase of roots percent in surface layer and decline in deep layer. Moreover, traffic made the soil density and hardness increase.

结果表明：践踏胁迫下，3种草坪草地下生物量变化表现出较大差异，草地早熟禾和日本结缕草先增加后下降，高羊茅一直呈下降趋势；3种草坪草表层根系（0~5cm）所占比重明显增加，深层根系所占比重减小，根系的表层化现象明显；研究还表明，践踏使表层土壤容重和硬度增加，物理性质恶化。

The results showed that soil copper contamination did not significantly affect the leaf growth of Bermuda grass and its influence on root biomass and leaf chlorophyll content in Bermuda grass were also less than that in zoysiagrass.

结果表明：铜污染处理对狗牙根草坪的地上部分叶片生长量的影响不显著，对根系生长量和叶绿素含量的影响也明显小于结缕草；铜污染处理未引起冷季型草坪的叶绿素含量的下降，对高羊茅草坪的密度影响不显著，对叶片生长量的影响也明显小于草地早熟禾和多年生黑麦草，而草地早熟禾虽然叶片生长受到了严重的抑制，但根系生长未受到显著影响，也表现出了对土壤铜污染的一定的耐性。

Grasslands need time to rest when cattle and other animals feed on them.

如果用草地来喂养牛羊和其他动物，草地需要时间来休息。

Through comparing effects between grazing systems and a feedlot system on the degenerated vegetation, the roles of rotational grazing system playing in vegetation recovery were investigated.

通过对比研究放牧制度及围栏封育对退化草地植被的影响，来探讨划区轮牧在退化草地植被恢复中的作用以及最优的放牧方式。

He could take a community and run it over and over again in different combinations, making ponds without algae, woods without termites, grasslands without gophers, or just to cover the bases, jungles with gophers and grasslands with algae.

他可以选择一个群落，以不同的组合一遍又一遍地进行试验，比如说生成没有水藻的池塘，没有白蚁的森林，没有黄鼠的草地，或仅仅是出于全面涵盖的需要，生成有黄鼠的丛林和有水藻的草地。

He could take a community and run it over and over again in different combinations, making ponds without algae, woods without termites, grasslands without gophers, or just to cover the bases, jungles with gophers and grasslands with algae.

他可能选择一个群落，一遍一遍地以不同的组合来操纵它，制作没有水藻的池塘，没有白蚁的森林，没有囊地鼠的草地，或只是控制这块基地，制作有囊地鼠的丛林，有水藻的草地。

Within a few years, there was not enough grass for all the cattle, especially along the trails.

在短短几年内，已经没有足够多的草地来养这些牛了，特别是前往火车站沿路的草地就更少了。

I would have sat on the lawn with my grass stains.

我会选择坐在草地上看风景，即使被草地弄脏我的衣服也毫无关系。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。