| The frequent occurrence of extreme climatic events caused by global climate change increases the instability of forest ecological environment.To clarify the spatiotemporal evolution characteristics of the hydrological resources of Jiulianshan national nature reserve in the context of climate change,This paper analyzed and sorted out the meteorological data from 1982 to 2013 years of Jiulianshan Xiagongtang and the runoff data of no.2 weir from 2000 to 2013 years.Using the climate trend rate,mann-kendall mutation analysis,difference product curve,correlation coefficient and water balance equation,It analyze that the effect of Climate change characteristics and climate change to national nature reserve of Jiulianshan,s Surface runoff and water conservation capacity.It studies the spatial distribution of water conservation in the reserve using ArcGIS spatial analysis tool.The main conclusions are as follows:(1)The evolution characteristics of climate resources in Jiulianshan national nature reserve from 1982 to 2013 years:(1)The average annual temperature,the annual maximum average temperature and the annual minimum mean temperature were all rising in different degrees.All the three were the most significant in winter,and the fluctuation was more obvious.(2)Annual precipitation showed a downward trend at the rate of-38.74mm/10 a,and the annual precipitation showed a single peak type.The precipitation in the four seasons has a certain fluctuation.The coincidence degree between precipitation and annual precipitation is high,while the non flood season has a significant downward trend at the rate of-64.99mm/10 a.(3)The annual mean evapotranspiration is decreasing at the rate of-12.33mm/10 a,and may continue to decline in the future.The annual mean evapotranspiration trend is obvious in spring,and the trend is general in other seasons.(2)The climate response to runoff change in Jiulianshan national nature reserve from 2000 to 2013 years:(1)There is a certain correlation between the change of runoff and temperature,precipitation and evapotranspiration,and the adjustment ability of the three to the runoff size : precipitation> air temperature > evapotranspiration.(2)Annual runoff is negatively correlated with annual mean temperature and maximum temperature,but positively correlated with minimum temperature.(3)The annual runoff has a very significant positive correlation with precipitation,and the relationship between precipitation and runoff in summer is the most significant,and the trend of runoff change in flood season is in good agreement with the trend of annual runoff.(4)Annual runoff and evapotranspiration are negatively correlated.(3)The ability of water conservation in Jiulianshan national nature reserve:(1)The average interception capacity of the forest ecosystem is 25.34% in reserve from 2000 to 2013 years,the interception of the year in the flood season is 66.1% of the total interception,the average storage capacity is 22.76%.While the interception of the year in the flood season is 33.9% of the total interception,the average storage capacity is 34.76%.(2)In the six species of forest,there was a small difference in the ability of blocking ability,and the most important one was broad-leaved forest,followed by coniferous forest and bamboo forest.(3)Comprehensive interception ability of canopy layer,litter layer,soil layer,The total water conservation ability of the 6 types of forest classification in Jiulianshan natural reserve is that: Broad-leaved forest > coniferous forest > bamboo forest > shrubbery > coniferous broad-leaved mixed forest > economic forest.The broad-leaved forest is located in the central region of the central region,in other words,Water conservation capacity is the strongest in central reserve. |
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