水土

From my two field surveys to the hinterlands in 1987 and 1995, respectively, I was shocked by the facts that swidden agriculture still prevailed widely, and some of the villages faced serious soil erosion and water shortages arising from traditional practices.

乡村景观的实地考察说明：这些地区刀耕火种、轮歇耕作仍然盛行，不少居民已经面对着农牧业用地向林区过度扩张所致的水土流失、水源枯竭等严重环境问题。

This paper has made systematic research about characteristics of soil water dynamic changes, water deficit of the root-zone of pear-jujube tree with regulated deficit irrigation, physiological control in the process of the water use and the stomal response mechanism of pear-jujube tree under the water deficit environment, and the effects of different deficit irrigation levels at different growth stages vegetative growth and repproductive growth of pear-jujube trees, and also its regulation mechanism.

针对西北半干旱区果业生产面临水资源紧缺的现实，论文以该区特色经济果树梨枣树为研究对象，在西北农林科技大学旱区农业水土工程教育部重点实验室、陕西省大荔县城关镇梨枣园分别开展了温室与大田试验，对调亏灌溉的梨枣树根区土壤水分动态变化特征、水分亏缺与复水环境下梨枣树用水过程、生理调控与气孔响应机理、不同生育期不同水平亏水处理对营养生长与生殖生长的影响及其调控机制等进行了较系统的研究，分析了各生育期不同亏水处理对梨枣耗水规律、产量、品质、作物系数、水分利用效率及经济效益的影响，取得了以下成果：⑴通过亏水处理与复。。。

Farther away the yellow, scarlet, orange, and wine of the forest top blend into tawny flame that is textured, not by tree form or leaf shape, but by the sweeping away of the land itself.

远处，森林顶部的黄色、猩红色、橙色和紫红色融合在黄褐色的光焰中。这些色彩显得很有质感，不是因为树木或者叶子的形状，而是因为土地自身的水土流失。

The real-time, fast, and accurate measurements of sediment and flow rate can help to understand the dynamic soil erosion processes and to automate the monitoring practice of water loss and soil erosion.Volumetric or oven-dry method has long been the standard method for determining sediment concentration.

坡地径流全过程含沙量和径流量的连续、快速、准确和动态监测，为研究土壤侵蚀动态力学过程提供重要的参数，同时使水土流失动态监测网络向自动化和智能化过渡。

Northwest China is one of the areas with the severest soil erosion and poverty in China.

西北地区是我国水土流失最严重的一个地区，也是我国贫困人口的集中分布区。

This is an area with severest soil erosion.

这个地区水土流失最严重。

In the right hand picture, the people have returned carrying tools, water and samplings for the reforestation of the land.

我认为，漫画家要告诉我们的是：树木对水土保持的重要性，以及每个人参与抵制沙化威胁的必要性。

In the right hand picture, the people have returned carrying tools, water and samplings for the reforestation of the l and.

我认为，漫画家要告诉我们的是：树木对水土保持的重要性，以及每个人参与抵制沙化威胁的必要性。

The reduction of sediment transported down the Mississippi River was the result of engineering modification of the Mississippi, Missouri, and Ohio rivers and their tributaries by dams, meander cutoffs, river-training structures, and bank revetments and soil erosion control programs in the areas drained by them.

夹带砂石量的减少是由于沿河地区建起了不少水利改造工程，例如密西西比河、密苏里河及俄亥俄河及其支流上的大坝修建、截弯取直工程、河道重塑、河岸护堤工程和水土流失防控工程。

Where land reclamation has already caused aridity or serious soil erosion, the local people's governments at the county level or above shall close the area for a limited time and order the reclaimers to restore the vegetation and defer farming for a return to animal husbandry.

已经开垦并造成草原沙化或者严重水土流失的，县级以上地方人民政府应当限期封闭，责令恢复植被，退耕还牧。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。