| The special nature of the agricultural and pastoral ecotone in Inner Mongolia makes its ecological function relatively fragile.Artificial caragana forest can not play a role in water and soil conservation,but will lead to the deterioration of the ecological environment.Based on Inner Mongolia patterns in huanghua Watershed stone basin is a typical Caragana korshinskii plantation as the research object,in the comprehensive investigation and study of Caragana korshinskii,planting density,site conditions,plantation age,such as premise,Caragana korshinskii are 0 cm,10 cm,20 cm flat crop processing,and with outstanding crop processing for comparison,Caragana korshinskii are analyzed for four consecutive years different flat crop pattern of Caragana korshinskii physiological and ecological characteristics and characteristics of the dynamic change of soil moisture content,In this paper,the soil moisture content of Caragana korshinskii with different years of flat stubble was comprehensively evaluated.The results of this study have important theoretical significance to reveal the regeneration and rejuvenation of Caragana korshinskii in the agricultural and pastoral interlacing zone of Inner Mongolia.The main conclusions are as follows:(1)There was no significant difference in the physiological and ecological characteristics of the above and underground parts of Caragana korshinskii in the non-flat stubble model among different ages.(2)Different flat crop mode of Caragana korshinskii,plant height and crown growth,when the branch length(except 4 years),the branch base diameter,the shoot biomass,net photosynthetic rate,transpiration rate,stomatal conductance,water use efficiency,sapwood than conductivity,leaf conductivity,fine root quality,fine root total root length,root vigor,soluble protein content(except 1 years)were higher than open crop pattern;Stomatal limit value,embolism degree,wood density,proline content(except 1 years)and cell membrane permeability(except 1 years)were all lower than that of non-stubble model.(3)Different crop pattern of Caragana korshinskii,plant height and crown growth,when the branch length,the branches base diameter,the shoot biomass,net photosynthetic rate,transpiration rate,stomatal conductance,sapwood permeability(except 1 years),leaf than conductivity(except 1 years),fine quality,fine root root total root length,root vigor,soluble protein content were as follows:10cm flat pattern>20cm flat pattern>0 cm flat pattern>Non-flat stubble mode;The stomatal limit value,embolism degree(except 1 years),wood density(except 1 years),proline content,and cell membrane permeability were all shown as the 0 cm flat pattern>20cm flat pattern>10cm flat pattern>Non-flat stubble mode.(4)With the increase of soil layer,the soil moisture in the flat stubble patterns from may to November of each year fluctuated and tended to be stable.Except that the surface soil moisture content of Caragana korshinskii was higher in the first year,there was no difference between the surface soil moisture content of Caragana korshinskii in the first year.With the increase of the number of years of flat stubble,the soil moisture content of Caragana korshinskii of three flat stubble modes gradually increased,and the results showed that the soil moisture content in the middle layer recovered earlier,the deep layer recovered later,and the recovery rate of soil moisture content in the fourth year of flat stubble gradually decreased.In addition to the first year of flat stubble,the soil moisture content of three flat stubble models of Caragana korshinskii was as follows:Non-flat stubble mode>10cm flat pattern>20cm flat pattern>0 cm flat pattern.(5)The flat stubble measures had a significant effect on the water evolution cycle of Caragana korshinskii.The flat stubble of Caragana korshinskii in the non-flat stubble mode for 1-4 years had four periodic variation rules in the 0-60cm soil layer.At 60-140cm,there are three periodic variation rules.There are two periodic variation rules at 140-200cm.The flat stubble pattern of Caragana korshinskii has four periodic variation patterns at 0-140cm for 1-4 years.There are three periodic variation rules at the position of 140-160cm.There are two periodic variation rules at 160-200cm.The results showed that the flat stubble pattern had a significant effect on the soil moisture content of Caragana korshinskii.(6)A comprehensive evaluation was carried out on three flat stubble modes and non-flat stubble modes for Caragana korshinskii in each year.The results were as follows:10cm flat pattern>20cm flat pattern>0 cm flat pattern>Non-flat stubble mode.(7)The different flat fixed number of year of the crop of Caragana korshinskii correlation study on each index and soil moisture content,flat crop measures has influence on the index correlation Caragana korshinskii,different level of crop model and Caragana korshinskii,the correlation features:Non-flat stubble mode>Flat stubble 4 years>Flat stubble 3 years>Flat stubble 2 years>Flat stubble 1 years;The correlation between the above physiological characteristics of Caragana korshinskii in different flat stubble patterns was as follows:Flat stubble 3 years>Flat stubble 2 years>Flat stubble 1 years>Flat stubble 4 years>Non-flat stubble mode.The correlation between fine root growth characteristics of Caragana korshinskii in different flat stubble patterns was as follows:Flat stubble 3 years>Flat stubble 2 years>Flat stubble 1 years>Flat stubble 4 years>Non-flat stubble mode.(8)different flat crop model earth growth characteristics,physiological characteristics,fine root growth characteristics and the differences of absolute value of correlation of fine root physiological characteristics,outstanding crop model relatively flat crop of Caragana korshinskii,Caragana korshinskii the earth growth index and physiological index,fine root physiological indexes and the correlation of absolute value between the moisture content is larger,the ground of fine root growth index and physiological index and the correlation between fine root physiological indexes,the absolute value is larger,fine root growth index and fine root physiological indexes and the correlation between soil moisture content of the absolute value is larger,fine root physiological indexes of the correlation between soil moisture content and the absolute value is larger,The results showed that flat stubble changed the correlation between the original indexes of Caragana korshinskii,especially the correlation between soil moisture content and other indexes.(9)on different crop pattern Caragana korshinskii each indicator principal component analysis,to select the characteristic value of the principal component and factor are studied,compared with the open of crop pattern,flat crop changed the overall index of Caragana korshinskii on characteristic value of principal component analysis and the principal component contribution rate,reduced the Caragana korshinskii growth indicators for general expression of Caragana korshinskii,enhances the ground,fine fine root growth and root physiological characteristics for the overall index of explanatory,explained from the perspective of the overall index flat crop of Caragana korshinskii,the effects of every index.Along with the increasing length of flat stubble,characteristic value of the principal component analysis and the principal components also have this change,the above-ground growth characteristics of Caragana korshinskii integral explanatory enhanced gradually,with the increase of flat fixed number of year of the crop,this enhancement effect,explained from the perspective of the overall index flat fixed number of year of the crop of Caragana korshinskii,the effects of every index. |
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