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1.
The characteristics of water balance in arid regions is that the streams are formed in mountain area and continuously evaporates
and infiltrates in the process of flowing to plain area, streams finally disappear in the desert or flow into the lakes, which
are the low reaches of the rivers. But the distribution and transformation of water in Xinjiang, China have changed under
the influences of human activities. The influences of human activities take place in a short time and regionally, especially
in arid land where water is the key factor of environment. Water inside of oasis has increased, and water out of oasis or
at the lower reaches of the river has decreased. Human activities have caused the environment changes in both positive and
negative aspects by changing the circulation and distribution of water. Under the influence of human activities, oases in
Xinjiang have expanded, meanwhile some lakes have contracted desertification is serious, natural vegetation has declined and
natural environment out of oasis has degenrated.
Foundation item: Under the auspices of the National Natural Science Foundation of China(49771009).
Biography: LI Xin(1940 -), male, a native of Anhui Province, professor. His research interest includes water resources. 相似文献
2.
LUO Zhi LIU Yongjian MAI Kangsen and TIAN Lixia Institute of Aquatic Economic Animals School of Life Sciences Sun Yat-sen University Guangzhou P.R.China Fisheries College Ocean University of China Qingdao P.R.China 《中国海洋大学学报(英文版)》2005,4(2)
The paper reviews the recent advances in studying grouper nutrition requirement for the development of cost-effective and environmentally friendly artificial diets. It consists of seven parts: protein and amino acid, lipid and essential fatty acid, carbohydrate, vitamin, mineral, alternative protein source, broodstock and larval nutrition. The review provides some basic information for further investigation of nutrient requirements of groupers. 相似文献