Abstract
In recent decades, there are lots of the changes of land use in the Liusha River basin in Xishuangbanna, Yunnan Province. The large-scale replacement of natural forests by rubber plantation have had a certain impact on the ecological environment and water resources in the Liusha River basin. Based on the data of runoff, rainfall and evaporation from 1963 to 2015 measured by Menghai Hydrological Station of Liusha River, the effects of climate change and human activities on the ecological environment of Liusha River runoff and the degree of change were analyzed by using the comparison method of slope change rate of runoff accumulation. The research results show that the cumulative amount of runoff flow after mutation presents significant decrease trend from 1963 to 2015. Because of the Liusha river runoff change decision which residents downstream watershed water security, the runoff of the ecological environment situation and analysis, the protection of natural resources such as forests and the effective protection of regional water resources sustainable development has important guiding significance.
Highlights
Liusha River is an important tributary of the lower reaches of Lancang River in Yunnan Province, and the nearest river to the center of Jinghong City in Xishuangbanna
Since the mid-1990s, the population boom and the huge demand for rubber in the global market have led to the deforestation of a large number of primary forests due to the massive planting and cutting of rubber and tea trees in the upstream basin of the Liusha River[1].Ecological environment, biological diversity and regional water security caused a certain influence by large, single economic forest plantations on the whole river basin.[2,3]
It can be seen from figure 2 that the annual runoff shows a slow rise and decline trend of change after tested menghai station Kendall rank correlation test statistics |U|=2.78>1.96, indicating that the runoff of Liusha river had a significant variation trend and a significant reduction trend between 1963 and 2015
Summary
Liusha River is an important tributary of the lower reaches of Lancang River in Yunnan Province, and the nearest river to the center of Jinghong City in Xishuangbanna. Since the mid-1990s, the population boom and the huge demand for rubber in the global market have led to the deforestation of a large number of primary forests due to the massive planting and cutting of rubber and tea trees in the upstream basin of the Liusha River[1].Ecological environment, biological diversity and regional water security caused a certain influence by large, single economic forest plantations on the whole river basin.[2,3] The new trend of runoff change shows regularity. The periodic change and development situation of Liusha river runoff and quantitative calculation had been analyzed. It is important to contribute effective management and reasonable development of the basin water resources to figure out the impact of climate change and human activities on the runoff trend.
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