| Soil and water loss caused by slope erosion mainly includes the deterioration of soil quality and soil fertility,which has become a prominent environmental problem in China.This research area is located in the and Technology Demonstration Park Shibi Town,Ninghua County.The research object is Dicranopteris dichotoma under different control measures and its soil.The biodiversity,soil properties,eco-chemical characteristics of Dicranopteris dichotoma under different control measures,eco-chemical characteristics of Soil and the effect of Dicranopteris dichotoma on reducing runoff and sediment are mainly analyzed,ecological effect analyzed.The main achievements are as follows:(1)According to the investigation results of plant diversity of various treatment measures,the recovery effect of “arbor + shrub + herbaceous + bamboo trench” is better than that of tableland treatment area,and the measures of terrace treatment are also ideal.Cherry blossom and separated terrace has the best effect,but requires a long period.At different stages of ecological restoration,the management measures adopted are also different.The coordination between the total number of species and the number of species should be paid attention to.In the early stage,herb and shrub restoration is the main method,while in the later stage,broad-leaved tree restoration is the main method.(2)Different treatment measures will play a certain role in improving soil physical and chemical properties,but there are differences in the recovery effect between different treatment measures.The K value of CK sample soil erodibility >0.35 is highly erodible soil,and after treatment,the K value of soil erodibility is <0.35,which is reduced to medium-high erodible soil.There are significant differences in stoichiometric characteristics between different control measures and different parts.The stoichiometric characteristics of soils under different control measures are only related to individual factors of soil physical,indicating that the stoichiometric characteristics of soils are influenced by multiple factors,not by a single factor.(3)Total carbon of Dicranopteris dichotoma is different between each organ in aerial part and underground part difference(P<0.05),and no obvious regularity under different control measures,total nitrogen content of Dicranopteris dichotoma part are mainlyconcentrated in the ground,nitrogen is higher than the underground parts of the earth,The phosphorus of Dicranopteris dichotoma is mainly concentrated on the blade,especially between leaf and other organs.The N/P of the organs of Dicranopteris dichotoma is mainly concentrated in the overground and dead leaves,while the petiole and underground stem roots are relatively few.There was no significant correlation between C,N,P and purple soil under different control measures,but the correlation degree of phosphorus was higher,which indicated that the restriction of organic growth and development of Dicranopteris dichotoma under different control measures was mainly due to the role of soil phosphorus.(4)The flow-generation time increased with the the coverage of Dicranopteris dichotoma.When the coverage was more than 60%,the slope of the initial flow-generation time curve slowed down.When the coverage was 10~50%,the flow generation time had a small change range.The flow rate of purple soil slope decreases with the increase of the cover of Dicranopteris dichotoma,and there is a significant negative correlation between them.However,if the coverage of Dicranopteris dichotoma is less than 50%,it has no significant effect on runoff reduction.If the coverage of Dicranopteris dichotoma is greater than 50%,the runoff decreases significantly and in a stable state.When the cover degree of Dicranopteris dichotoma is greater than 50%,the sediment yield of the slope will reach a stable value,and the change range is small,indicating that when the cover degree of Dicranopteris dichotoma reaches 50% on the purple soil slope,it will have a good effect on soil and water conservation.With regard to the slope infiltration rate,the penetration intensity curve of the cover of the Dicranopteris dichotoma is close to that of the slope between 50% to 60%,which may be due to the critical value of the cover between 50% to 60%. |
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