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19 results on '"Lv, Xianguo"'

3. Ecosystem Management

Author

Dai, Limin, Shao, Guofan, Ren, Jizhou, Wang, Tao, Chen, Guangting, Lv, Xianguo, Xu, Qinzeng, Yang, Hongsheng, Xu, Qiang, Luo, Shiming, Ma, Lin, Qian, Liu, Ma, Wenqi, Zhang, Fusuo, Huang, Jikun, Jia, Xiangping, Xiang, Cheng, and Li, Wenhua, editor

Published
2015
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8. Sources of monsoon precipitation and dew assessed in a semiarid area via stable isotopes

Author

Lv Xianguo, Jiang Ming, Zhang Shichun, Liu Bo, Zhang Wenguang, Zhang Jing, and Meng Jingyi

Subjects
Hydrology, 010504 meteorology & atmospheric sciences, Moisture, 0208 environmental biotechnology, Lowest temperature recorded on Earth, 02 engineering and technology, 01 natural sciences, 020801 environmental engineering, Evapotranspiration, Environmental science, East Asian Monsoon, Relative humidity, Dew, Precipitation, Water cycle, 0105 earth and related environmental sciences, Water Science and Technology
Abstract

Precipitation is usually the primary source of water for the hydrological cycle in a semi-arid area. However, dew occurs frequently and affects water circulation dramatically in the west of Jilin Province in China. Measurements of the amount of dew formed and precipitation were carried out from July 2012 to October 2013 in the Momoge Natural Reserve. The results indicated that moisture from primary precipitation in the summer originated from the East Asian Monsoon and was affected by the atmospheric circulation in the middle and high latitudes of Eurasia in the winter. The dew amount was approximately 19.44 mm (approximately 5% of the total rainfall amount), consisting of the evapotranspiration in the local area and atmospheric moisture. Dew also supplies nutrients to the local vegetation. The maximum contribution of total nitrogen (TN), total phosphorus (TP) and potassium (K) in unit corn area could reach 288.60 mg/m2, 27.46 mg/m2 and 291.63 mg/m2 in half a month, respectively. The wind speed, relative humidity and lowest temperature were the primary factors that dramatically affected dew formation and amount. As an additional source of fresh water, dew not only had a positive impact on the ecosystem in arid and semi-arid zones but also played an important role in the local water cycle and other ecological processes. This research has important implications for water circulation and land use management.

Published
2017

9. 美国湿地保护制度变迁研究

Author

CHEN Xi, null 陈溪, Magdeline LABA, Robertson MORGAN, Barbara COSENS, null 王子彦, null 陈雪, James ANDERSON, Marinus OTTE, Christopher CRAFT, David FELDMAN, null 李杨帆, null 刘晶岚, Patrick SULLIVAN, null 吕宪国, WANG Ziyan, CHEN Xue, LI Yangfan, LIU Jinglan, and LV Xianguo

Published
2016

19. Changes in stream peak flow and regulation in Naoli River watershed as a result of wetland loss.

Author

Yao Y, Wang L, Lv X, Yu H, and Li G

Subjects
Geography, Models, Theoretical, Hydrology, Rivers, Wetlands
Abstract

Hydrology helps determine the character of wetlands; wetlands, in turn, regulate water flow, which influences regional hydrology. To understand these dynamics, we studied the Naoli basin where, from 1954 to 2005, intensive marshland cultivation took place, and the watershed's wetland area declined from 94.4 × 10(4)ha to 17.8 × 10(4)ha. More than 80% of the wetland area loss was due to conversion to farmland, especially from 1976 to 1986. The processes of transforming wetlands to cultivated land in the whole Naoli basin and subbasins can be described using a first order exponential decay model. To quantify the effects of wetlands cultivation, we analyzed daily rainfall and streamflow data measured from 1955 to 2005 at two stations (Baoqing Station and Caizuizi Station). We defined a streamflow regulation index (SRI) and applied a Mann-Kendall-Sneyers test to further analyze the data. As the wetland area decreased, the peak streamflow at the Caizuizi station increased, and less precipitation generated heavier peak flows, as the runoff was faster than before. The SRI from 1959 to 2005 showed an increasing trend; the SRI rate of increase was 0.05/10a, demonstrating that the watershed's regulation of streamflow regulation was declined as the wetlands disappeared.

Published
2014
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