| In this paper,typical forest types such as poplar,elm,Pinus sylvestris,Prunus armeniaca and Willow were selected in the forest of Duolun County,and the ecological benefits of forest land were studied.The soil biomass,soil physical and chemical properties and soil water holding capacity were studied by field investigation and sampling,laboratory experiment and data processing,statistical analysis and other methods,and the ecological benefits of the local forest land were quantified by using the measured data The differences between different stands and understory vegetation and soil characteristics and the differences between natural and artificial forests were analyzed and analyzed.The results could provide data for the sustainable management of stand in this area.The main results are as follows:1.In the community structure,the number of trees in the DBH of the six tree trees was the largest in the DBH of 7-10 cm,and in addition to the sample D9,the other average 2-6m and 8-1 lm trees,which indicates that the growth condition of sample D9 is the best.The species diversity of different stands is monitored.Because the forest structure and tree species of each forestland are too simple,the species diversity of this forest land is very low,and the richness index is very obvious,the highest is the sample D1-natural Mountain apricot forest,which shows that the species is so diverse,the stability is higher than other woodland.The results of the biomass analysis of the herbaceous layer of the forest were the highest as the sample D6-Huangliu natural forest,and the smallest was the D9-natural mountain forest;the artificial forest D5-Blue leaves minimum.It is known that D9 has a very large number of trees at DBH and tree height,and D3 is the smallest,which leads to DBH,tree height and density.The growth environment of undergrowth vegetation is more intense,and too much can not cover the sun Directly,the forest under the environment and thus drought,so the above forest growth of the vegetation close to the original form of grass,woodland on the impact of vegetation is not significant.All the different litter litter is larger than the original grass,in the natural forest is the largest sample D9,plantation in the sample D10.From the foregoing,we can see that the DBH and tree height of the sample D9 are many,so the more the accumulation of underground litter,and then the plot D10 is coniferous forest,falling needle and fruit will accumulate More of the more.2.The results of soil physical and chemical properties of different forest types in Duolun County were as follows:the soil bulk density increased slowly with the increase of soil depth,the change of water content was the same,and the same forest land changed uniformly law.In the chemical properties,soil organic matter,total N,total P,available N,available phosphorus and available potassium all decreased with the soil layer.The highest content of soil organic matter is D1-apricot natural forest;the highest P content is also D1-natural mountain apricot forest,available phosphorus is the highest D10-artificial Pinus sylvestris forest;the whole K content in the forest and between the forest and the original grass The average is within the range of 0.009g · kg-1;the content of available potassium is high,the highest is D1-natural mountain apricot forest.Compared with the control area?grassland?,it was found that the soil bulk density was lower than that of the original grassland,and the benefit of forest land was much higher than that of natural grassland.The content of nutrient content was natural forest>plantation>natural grassland,There are forest land to improve the effect of soil nutrients and grassland.3.The water holding capacity,infiltration status and soil water holding capacity of litter of natural forest and plantation were measured.? The litter volume of natural forest plots was larger than that-of artificial forest.? Both from the littervolume or holding an effective amount of water storage point of view,are D9-mountain forest for the highest.? There are two different relational relations in the relationship between litter water holding capacity and soaking time of different forest types.?The infiltration conditions of different forest types were as follows:In four natural forest plots,the infiltration rate of D9-Shanyang forest was the highest,while the highest plot was D5-sand Yulin,the lowest for the sample D10-Pinus sylvestris forest.?The order of porosity,water holding capacity and water storage capacity in different forest types were D10>D9>D2>D8>D4,and the maximum water storage capacity and water conservation capacity were shown.? From the analysis of the correlation between soil physical properties and soil water holding capacity,it can be seen that the maximum water storage capacity and the amount of water conservation in the soil are mainly determined by the soil pore condition,and at the same time,from the soil physical properties and soil infiltration In the correlation analysis,the initial infiltration rate and the steady infiltration rate were negatively correlated with organic matter content,water content and total porosity,and were positively correlated with soil density and non-capillary porosity.Compared with the control area,we can see that the influence of forest land on soil moisture is larger than that of the original grassland,and the porosity,water holding capacity and water storage capacity of each plot are different from that of the control area D10>D9>D2>D8>D4>control area,whether it is the maximum storage capacity or water conservation,are showing trees>shrubs>grassland. |
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