| Changting is one of the most serious soil erosion area in the red soil region of southern China.It has become a preliminary treatment area of pinus massoniana forest in the process of soil and water loss management.Although soil and water loss degree,there are still have many ecological problems,such as single stand structure,low species diversity,soil nutrient depletion,bad stand stress tolerance,very prone to fire,serious impact on the early results of governance.Therefore,how to improve ecological function of Pinus forest in Changting preliminary treatment soil erosion area has become an urgent project in the task of a new soil and water loss control round.The transformation of coniferous forest interplanting broad-leaved tree species is a stand transformation methods in subtropical areas.But there are poor research on the transformation of pinus massoniana forest on the preliminary treatment area in red soil erosion of southern China.It greatly restricted the improvement of pinus massoniana forest ecological function in the preliminary treatment area of red soil erosion.Therefore,based on suitable broadleaf species screening,Elaeocarpus sylvestris,Michelia chapensis,Michelia maudiae Dunn and Liriodendron chinense(Hemsl.)Sarg had been interplanted in the pure pinus massoniana forest at Hetian,Changting preliminary treatment area.They has been interplanted in the dirrefent densities and thinning intensities of pure pinus massoniana forest.It had establish the standard runoff plot with different tests.This research is choose the best broad-leaved tree species interplanting models that not only can control soil erosion,but also can improve ecological function of pinus massoniana forest,to application in real production.On the basis of the previous research of tutor group,it used standard runoff plot observation method to research the interplantting effect of pinus massoniana growth,soil and water loss,soil fertility,undergrowth vegetation in three years.And it compare the effect of pinus massoniana forest ecosystem with interplanting different broad-leaved tree,and analysis it's relationship between soil erosion and rainfall.And it used principal component analysis to comprehensively evaluate the ecological improvement effect of different interplanting model,and then choose the best interplanting model in pinus massoniana forest of Changting preliminary treatment area.The research results can provide scientific gist for transformation and ecological function improvement of pinus massoniana forest in the red soil region,Changting,Fujian.Main research results show that:(1)Different density of Pinus massoniana with interplanting broad-leaved tree species have difference on soil erosion,Michelia chapensis and Elaeocarpus sylvestris had an obvious effect on soil erosion control.The canopy of 0.2 and 0.4 Pinus massoniana with interplanting Michelia chapensis had the best effect on soil erosion control.The runoff,soil erosion and nutrient loss from lowest to highest were interplanting Michelia chapensis,Elaeocarpus sylvestris and pure woodland.The canopy of 0.6 and 0.8 Pinus massoniana with interplanting Elaeocarpus sylvestris had the best effect on soil erosion control,and the runoff,soil erosion and nutrient loss of it was lower than that of interplanting Michelia chapensis woodland.With the increasing degree of canopy,the runoff,soil erosion and nutrient loss of Pinus massoniana pure woodland and with interplanting Michelia chapensis woodland and Elaeocarpus sylvestris woodland were decreased gradually.(2)Different thinning intensity Pinus massoniana with interplanting broad-leaved tree species have difference on soil erosion,Michelia maudiae and Liriodendron chinensis had an obvious effect on soil erosion control.No thinning and thinning 20%Pinus massoniana with interplanting Michelia maudiae had the best effect on soil erosion control.The runoff,soil erosion and nutrient loss from lowest to highest were interplanting michelia maudiae,Liriodendron chinensis and pure woodland.Thinning 40%and 60%Pinus massoniana with interplanting Liriodendron chinensis had the best effect on soil erosion control.The runoff,soil erosion and nutrient loss of it is lower than that of interplanting michelia maudiae woodland.With the increasing of thinning intensity,the runoff,soil erosion and nutrient loss of Pinus massoniana pure woodland and with interplanting Michelia maudiae and Liriodendron chinensis woodland were increased gradually.(3)Under different density interplanting models,the plot runoff was significantly correlated with P,T,E,PT,soil erosion was significantly correlated with I30,PI30,EI30,and nutrient loss was significantly correlated with I30,E,PI30,EI30.Under different thinning intensity interplanting models,the plot runoff was significantly correlated with P,T,E,PT,soil erosion was significantly correlated with I30,E,PI30,EI30,and nutrient loss was significantly correlated with I30,E,PI30,EI30.(4)The interplanting,including different density and different thinning intensity,can improve soil fertility,such as soil bulk density,moisture content,non capillary porosity,capillary porosity,soil pH,organic matter,total nitrogen,hydrolytic nitrogen,total phosphorus,available phosphorus,total potassium,available potassium.(5)The interplanting,including different density and different thinning intensity,can promote pinus massoniana growth.The species richness and species diversity of different canopy and thinning intensities treatments woodland had no significant difference compared with corresponding control.(6)Under different canopy density interplanting models,the principal component analysis comprehensive evaluation results showed that canopy density of 0.2 and 0.4 with interplanting Michelia chapensis were better for enhancing forest ecosystem,and canopy of 0.6 and 0.8 with interplanting Elaeocarpus sylvestris were better for enhancing forest ecosystem.(7)Under different thinning intensity interplanting models,the principal component analysis comprehensive evaluation results showed that no thinning,thinning 20%and thinning 60%with interplanting Michelia maudiae were better for enhancing forest ecosystem,and thining 40%with interplanting Liriodendron chinensis was better for enhancing forest ecosystem. |
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