| Negative air ions concentration(NAIC)is a important and new tourism resources.Clarifying the distribution of NAIC in Taihangan Mountain has greast academic signality to rational exploitation of the resources of NAIC in the areas.The distribution of negative air ions concentration and the relation of it and forested plant,altitude,water and air temperature,relative humidity in three typical tourism areas Bailixia National Forest Park in Laishui,Tianshengqiao National Forest Park in Fuping and tourism area of Qingxiling were measured by using ITC-201A air ion monitor and were analyzed in the mainly season of plant growth(4～10 month)in Taihang Mountains.1 The results on the monthly change of NAIC in tourism area of Qingxiling were showed as follows.The monthly change of NAIC in different ecological zones were nearly consistent and presented bimodal curve,but the month that arrived climax of concentration of air negative ions in different ecological zones was inconsistent;The monthly change of air ion polarity ration(AIPR)and air ion assessment index(AIAI)in different ecological zones were different;In tourism zone,coniferous and broad-leaved mixed stand in plane zone＞plantation in hilly mountain＞shrub and grass stand in hilly zone＞riparian wetland;Average human comfort degree and air quality from finer to poorer in areas was coniferous and broad-leaved mixed stand in plane zone＞plantation in hilly mountain＞shrub and grass stand in hilly zone＞riparian wetland.2 The results on the daily change of NAIC in tourism area of Qingxiling were showed as follows. In spring and autumn,NAIC in the early morning(8:00)and late afternoon(18:00)was higher with lowest in the afternoon(14:00)during a day;in summer,NAIC in the morning(10:00)and afternoon (16:00)was higher with lower with early morning(8:00),mid-day(14:00)and afternoon(18:00).The diurnal coefficient of variation of NAIC in the entire season of plant growth were in the order of spring (0.478)＞summer(0.181)＞autumn(0.150);The diurnal fluctuation of NAIC in different season in same ecological zone was different;The daily change of AIAI and AIPR in different ecological zone in same season was different.3 The results on Spatio-temporal changes of NAIC of Bailixia National Forest Park were showed as follow.The seasonal change of NAIC in every ecological zones were both summer＞autumn＞spring; The NAIC of ecological areas in tourism in spring,summer and autumn were all small waterfall zone＞secondary forest in hilly mountain of water zone＞secondary forest in hilly mountain of Without water zone＞valley ecological zones＞shrub and grass stand in hilly zone;The sequence of AIPR and AIAI in ecological zones of tourism in different season from high to low were all different;In spring,summer and autumn,the quantity of ecological zones that the value of AIPR was lower than 1.0 have 0,1 and 3, respectively;,The quantity of ecological zones that the value of AIAI was higher than 0.7 accounting for 20%,80%and 60%of the total,respectively.4 The results on Spatio-temporal changes of NAIC of Tianshengqiao National Forest Park in Fuping were showed as follows.The sequence of NAIC,AIAI and AIPR in ecological zones of tourism in different season from high to low were all consistent.The NAIC of every ecological zones in different season was different;The average value of NAIC in tourism was near-water zone in valley＞warm temperate broadleaf mixed forest in water zone＞secondary shrub and grass stand in hilly zone in water zone＞cool temperate coniferous and broad-leaved forest in without water zone＞alpine meadow zone.The seasonal change of the value of AIAI and AIPR in every ecological zones was different;In spring,summer and autumn,the quantity of ecological zones that the value of AIPR was lower than 1.0 accounting for 40%,60%and 60%of the total,respectively;the quantity of ecological zones that air quality arrive the A grade(1.0)accounting for 60%,80%and 60%of the total, respectively.5 The comparatively analyzed result on Spatio-temporal change of NAIC of there tourism areas were showed as follows.In spring,summer and autumn,the value of NAIC was all Tianshengqiao National Forest Park＞Bailixia National Forest Park＞tourism area of Qingxiling;The average of NAIC in Tianshengqiao National Forest Park were 2.2 times and 4.0 times,respectively,to the average of NAIC in Bailixia National Forest Park and tourism area of Qingxiling;The time that the value of AIPR was lower than 1.0 and the air quality arrived A grade(1.0)in different tourism zones was different; The seasonal change of NAIC,AIAI and AIPR in different tourism zones was different;The seasonal fluctuation of NAIC,AIAI and AIPR in different tourism in spring,summer and autumn were all different.6 The results in the relation of NAIC with plant in forest were showed as follows.The daily fluctuation in forested areas was higher than non-forested areas;The NAIC in forested areas were obviously(P＜0.01)higher than those in non-forested areas in 1 d;In most time,the value of AIPR in forested areas was higher than non-forested areas,and,in every time the value of AIAI in forested areas was higher than non-forested areas respectively.The average air quality in forested areas was B grade (0.88)while the average air quality in non-forested areas was only E grade(0.19).The tendency of daily change ofNAIC,AIAI and AIPR in different forest type were all inconsistent;In three forest type,the NAIC of multiple layers forest that comprises arbor,brush and herb was the highest,at the same time,its Average human comfort degree and air quality were also the best,bush and herb double-layer structure forest was worse,and the grass was worst.The pattern of variation of the NAIC could be expressed as a one-humped curve with the altitude higher from 785 m to 2100 m,and the NAIC of mountain reaches the peak value at the altitude of 1500 m;The pattern of variation in value of AIAI with the altitude higher was similar to the NAIC,however, altitude of reaching peak value between 8 month and 10 month was inconsistent. With increased of distance to the water,the NAIC decreased in near-water ecological zone;the average value of NAIC in waterfall areas was 5.4 times and 21.4 times,respectively,to the average value of NAIC in stream water areas and static water areas;The tendency of variation of air quality and average human comfort degree in near-water zone from finer to poorer was similar to the tendency of variation of the NAIC.In dry seasons,NAIC increased as air temperature(6～29℃)decreased and air relative humidity (46～70%)increased;NAIC in rainy season showed trends of raising and then declining as air temperature(27～33℃)and relativehumidity(46～70%)increased.7 In addition,the average value of NAIC was 659 ions/cm~3,the average value of AIPR was 1.79 and the air quality was C grade(0.49)in Baoding city including tourism zones;The value of NAIC, AIAI and AIPR in tourism areas were 3.2 times,0.53 times and 5.8 times,respectively,to the value of Baoding center;The value of NAIC,AIAI and AIPR in different ecological zones of Baoding center were different.
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