Soil Water Conservation Function Of Typical Stands In Wuqiao River Basin

With the continuous increasing of the population of the world,the pressure of human activities to the resources and the environment is increasing.The shortage and pollution of water resources,the deterioration of the ecological environment,the deterioration of the function of the ecosystem and so on,which seriously affect the global water circulation,cause serious drought and flood disasters,threaten the living environment and people of human beings.Class well-being.Water conservation function is one of the important service functions of the ecosystem.It has always been a hot topic in ecology and hydrology research.Especially,as the most important terrestrial ecosystem,water conservation function plays an important role in ecosystem health.Forest soil water conservation function is affected by forest vegetation,soil environment,topography and other factors.There are significant differences in water conservation function of different regions,scales and types of forest ecosystems.As the main ecological function area in China,the water conservation function of the Three Gorges Reservoir area is related to the sustainable development of the reservoir area.In order to understand the relationship between forest and water conservation,recognize the effects of forest vegetation and forest soil on water conservation function,evaluate the function and formation mechanism of different forest conservation water sources,this paper chooses the typical forest types of the five Bridge River Basin in the middle of the Three Gorges reservoir,the Pinus massoniana forest,cypress forest,green green forest,Robinia pseudoacacia forest,poplar forest and other hard Broadleaf forest,other soft broad-leaved forest and citrus forest,through field observation,the soil hydrological parameters of different forest types were obtained.The water conservation function of different forest types was simulated by InVEST model,and the relationship between water conservation function of different forest ecosystems and soil hydrological properties was evaluated quantitatively.The results show that:?1?The soil natural water content of Robinia pseudoacacia forest land is the largest,the natural moisture content of soil in the pine forest land is the smallest,the natural water content of soil is in turn,the Robinia pseudoacacia forest?15.6%?>other hard broad leaf forest?14.8%?>poplar forest?14.7%?>cypress forest?14.5%?>Qinggang forest?13.8%?>citrus forest?13.7%?>other soft broad-leaved forest?12.8%?.)>Pinus massoniana?12.5%?.The mean value of soil bulk density in the forest land of Pinus massoniana was the smallest,and the soil bulk density in other forestland was the largest,and the soil bulk density was in turn,the other soft broad leaf forest(1.45 g.cm^-3)>citrus forest(1.44 g.cm^-3)>Qinggang forest(1.42 g.cm^-3)>other soft broad-leaved forest(1.40g.cm^-3)>cypress forest(1.38 g.cm^-3)>poplar(1.35 g.cm^-3)>Robinia pseudoacacia forest(1.34g.cm^-3)>Pinus massoniana forest(1.25 g.cm^-3).The soil total porosity of Pinus massoniana forest is the largest and the soil total porosity of Citrus forest is the smallest.Among them,the average total porosity of soil is:maudy pine forest?42%?>Robinia pseudoacacia forest?39.6%?>poplar forest?36.8%?>cypress forest?35.1%?>green ridge?34.9%?>other hard broad leaf forest?34.5%?>other soft broad leaf forest?33.6%?>Orange forest?31.5%?.?2?The amount of water storage in the woodland from large to small is:Poplar?1339.24 t/hm²?>Orange forest?1111.43 t/hm²?>Robinia pseudoacacia forest?1108.68 t/hm²?>other soft broad-leaved forest?1040.12 t/hm²?>green ridge?983.42t/hm²?>other hard broad leaf forest?910.91 t/hm²?>cypress forest?905.11t/hm²?>pine forest?563.68 t/hm²?.?3?The water conservation of Pinus massoniana forest and other hard broad-leaved forest in the five Bridge River Basin is the highest.The region is dominated by mixed forest,Pinus massoniana forest and cypress forest,the soil type is purple soil,the soil layer is thicker,it is favorable to the soil porosity development,and has good soil structure and aeration condition,the litter is more,most of the slope is more than 15 degrees C Affected by human disturbance,the average vegetation coverage is above 85%,which is favorable for tree growth and water conservation.