The Research On Monitoring Of Ecological Service Function And Assessment On The Ecological Value Of Soil And Water Conservation Forest In Hunan Province

In Hunan province under the background of the rapid development of forest ecosystem service functions,to Hunan province to study the various ecological service function of soil and water conservation forest,this article through to Xiangtan,in conjunction with the,Changsha,venture period Sangzhi five regional 15 pieces of sample of soil and water conservation forest of continuous investigation,ecology,forestry,soil science,ecological economics and other multi-disciplinary theory as a guide,use of forest ecological field observation and test analysis,mathematical statistics analysis method,the water conservation,soil main ecological service functions such as protecting fertilizer for continuous positioning monitoring and analysis,and using the measured data to estimate of its value,get the following conclusion:(1)From the point of function of water conservation,Chinese fir and broad-leaved mixed forest canopy water and litter reserves characterized by significant differences(P<0.05),the decomposition level reserves difference was not significant(P>0.05).Maximum capacity is higher than the national average broadleaf mixed litter layer,and the maximum capacity of fir was slightly lower than the national average.Compare three tree species of maximum water holding capacity,broad-leaved mixed is better,it also reflects the region’s soil and water conservation forests litter has better ability of holding water.Broadleaf mixed litter held most effectively,although Chinese fir litter maximum total reserves,but its effective held less than broadleaf mixed.(2)From the point of protecting fertilizer solid soil,in different parts of the soil water characteristics have great differences.Xiangtan area of soil and water conservation forest soil water-holding capacity in the capillary is strongest,and weak capillary moisture,show that the soil large pore is more,but the quality of a partial sand retention of fat ability is poor;Province soil layer thicker,have certain of capillary and the capillary moisture capacity;Changsha soil water-holding capacity is located in the medium,but its soil layer is thin,easy to infiltration.Analysis of soil nutrient elements in different soil depth,found that soil and water conservation forest nutrient element content in equilibrium,the difference was not significant between different regions,trace elements to the monitor area element Fe content is higher,uniform other trace elements,the difference was not significant between different regions.(3)The analysis of different ecological function value size comparison shows that the value of soil and water conservation forests soil water interception by canopy and estimated amount is much higher litter holding the value of water.The litter water is higher than that of canopy intercept value.For function of water conservation,the contribution of soil is above 95%.The overall size of the function of water conservation value depends on the value of soil water,in order to improve the function of water conservation,the size of the main is to increase the size of the soil water-holding capacity,that is from the structure of the soil and conduct the thorough research to the particle size.At the same time,comparing the nutrient value size,found that the value of the organic matter is much higher than that of several other elements of value,accounting for the total value of 72%right to see,the lowest value of P element,account for the total value of 1%the right.Overall function of the solid earth protecting fertilizer value depends on the value of the organic matter,in order to increase the size of the solid earth protecting fertilizer function value,mainly is to improve the content of soil organic matter,which have to be in-depth study from the aspects of soil microbes,but for other nutrients to the appropriate conditions the proportion of its content,to ensure that the balance of soil nutrients.(4)Fhe soil and water conservation forest ecological function mainly reflects in the water conservation function and solid earth protecting fertilizer function two aspects.Through 15 pieces of sample,according to the survey of the five regional soil and water conservation and soil protecting fertilizer value is much higher than the value of water conservation,accounted for the total value of 93%the right,but the value of water conservation and soil fixation between regions between protecting fertilizer value difference is not large,the overall size of the soil and water conservation function value depends on the solid earth protecting fertilizer quantity.Therefore,improve the soil water storage ability of protecting fertilizer,improve soil results and nutrient ratio is to improve the soil and water conservation forest ecological function of the core research point.