黄土高原

This paper systematically summarized and analyzed general development characteristics of soil profile CaCO3 in Loess hill gully area including source, content, forming-condition, distribution and illuviation- depth of CaCO3, which will have the most important significance for the further studies on global soil and climate change.Soil CaCO3 eluviation-illuviation is a relatively complicate process, soil CO2 is one of the important effect factors, which influences soil CaCO3 through controlling soil pH value and CaCO3 solution capability.

碳酸钙在土壤剖面中淀积的深度和类型是黄土高原土壤发育的重要标志，钙积层是黄土高原土壤发育环境的历史信息库，同时土壤碳酸钙作为土壤无机碳库重要组成，它通过溶蚀后再结晶与大气CO_2之间进行物质交流来影响全球气候变化。

It not only arains natural resources day by day and decreases the biological diversity,but also seriously prevents the Loess platean's area econnomy from developing continuingly,then threatens the local people's living and development,thus,the study and governing of biological degeneration should be regarded seriously.

中文摘要：摘要：生态退化是目前黄土高原所面临的主要环境问题，它不仅使自然资源日益枯竭、生物多样性不断减少，而且还严重阻碍黄土高原地区经济的持续发展，进而威胁当地人民的生存和发展，因此，对生态退化的研究和治理应给予万分的重视。

The lithologic characters changed from fluviolacustrine sandstone to aeolian Red Clay with thin interval of greyish-white sand layers at the depth of 602 m. It can be inferred from the rock strata and age that the development age of aeolian sequence in Lanzhou area was 7 Ma at least, which is in accordance with the bottom age (7~8 Ma) of the aeolian sequence of the eastern and central Loess Plateau, suggesting that their accumulation processes are unitary.

皋兰山剖面深度602 m处出现由河湖相砂岩向以风成红粘土为主常夹有薄层砂岩的地层转变，通过岩性地层及年代的推断，兰州地区的风尘序列堆积发育的年代至少为7 Ma，与黄土高原风尘序列堆积底界8～7 Ma基本一致，说明了兰州地区与黄土高原在风尘序列堆积过程中具有统一性。

Twelve soil samp les fr om 0～20 cm soil layerwere collected from north to south in the Loess Plateau calcareous soil and analyzed for fracti onation of organic and inorganic soil phos phorus by Hedleymethod, amended by Tiessen andMoir.

：以黄土高原自北向南采集的12个0～20cm耕层土壤为供试土样，采用 Tiessen和Moir修正的Hedley土壤有机无机磷分级方法研究了黄土高原石灰性土壤中不同形态磷组分的分布特征。

According to the "Waterbirds Species List" published by the State Forestry Bureau in 2003,the waterbirds in 8 zoogeographical prefectures and 4 zoogeographical provinces in Shaanxi Province were counted,and the community similarity indices between each zoogeographical prefecture and zoogeographical province were figured out.

河流众多的关中平原省的渭河谷地平原州的水鸟种类最多，有85种，水鸟最少的是干旱的黄土高原省的南部黄土塬土石山地梢林州，仅有23种；群落相似性指数最高的是相邻的黄土塬土石山地梢林州和渭北台塬州。

Therefore, doing research of the nutrient balance in the loessplateau has its practical signification. Using the long-term rotation and fertilization experiment that disposed in dry land on theloess plateau, the paper has studied nutrients in rainfall import to farmland ecosystem andAmmonia volatilization losses and nutrients disbursal of crop, also estimated the balance ofnutrients in farmland soil.

本文利用设在黄土高原旱地上的长期轮作与施肥试验，主要研究了黄土高原农田生态系统养分的降水带入、作物地上部分的氨挥发损失和作物的养分支出，并进行了 N、P、K 养分平衡评价。

The ecological environment of the Loess Plateau was warmer and moister than it is today, there was more luxuriant vegetation, and the forest land occupied about 25 % of the entire Loess Plateau.

黄土高原的生态环境较当今温暖湿润，植被更为繁茂，林地约占整个黄土高原面积的25%。

Taking Minhe area, especially the Heifang platform for example, the effect causes by irrigation in are analyzed. And for the sustainable development of agriculture in loess plateau, some agricultural measurers are put forward, such as advanced water saving irrigation techniques, optimizing the agricultural configuration, combining with project to improve the geological environment.

以民和地区，尤其是区内生态地质问题严重的黑方台为例，论述了黄土高原农业灌溉对生态地质环境的影响，提出从治水入手，改进灌溉方式，优化产业结构，并配合工程措施、生物措施以改善农业地质环境，促进黄土高原农业可持续发展。

Charcoal content in the eastern and western Loess Plateau was different on the different period of Holocene because of different environment conditions.

在全新世不同时期，黄土高原东、西部的炭屑含量存在一定差异，黄土高原东部火活动较为微弱，而西部火活动相对频繁，这是火环境条件区域差异性的表现。

Geography: Gansu lies at the juncture of three highlands: Qinghai-Xizang Plateau, Inner-Mongolia Plateau and Huangtu Plateau, and is bounded on the east by Shanxi, on the west by Xinjiang, on the south by Sichuan, on the north by Inner-Mongolia, Ningxia and Mongolia.

地理：甘肃熟记于此时三名高原：青藏高原，内蒙古高原，黄土高原，而东面界限，由山西，西连新疆，对黎巴嫩南部的四川，北至内蒙古-蒙古，宁夏和蒙古。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。