| This paper studies the Jingpohu Jiangshan hybrid larch forest Jiao Lin four operating mode and the density of the two types of forest litter and soil physical and chemical properties of seasonal variations,and to explore the area litter the return of soil physical and chemical properties and changes in the law Soil Microbial changes.Main findings include:(1) The density of hybrid larch forest litter of the forest for the hybrid larch 4400 tree·hm-2＞hybrid larch forest 3300 tree·hm-2＞hybrid larch forest 2500 tree·hm-2＞hybrid larch forest 6600 tree·hm-2.Hybrid larch forest litter of total reserves,no reserves of litter decomposition and litter decomposition of hybrid larch forest reserves are 3300 tree·hm-2＞hybrid larch forest 4400 tree·hm-2＞hybrid larch forest 2500 tree·hm-2＞hybrid larch forest 6600 tree·hm-2,not decomposition Most of the layers of.Between the various forest types of hybrid larch forest litter largest larch forest Changbai followed by Mongolia oak forest at least,and total reserves of litter,no reserves of litter decomposition and decomposition of litter reserves are Quercus mongolica Lin＞hybrid larch forest＞Changbai larch forest.(2) hybrid larch forest density and Mongolia four oak forest,deciduous forest Changbai deeper than shallow soil bulk density,soil bulk density from the average,the hybrid larch forest 3300 tree·hm-2＞hybrid larch forest 6600 tree·hm-2＞deciduous hybrid Pine 4400 tree·hm-2＞hybrid larch forest 2500 tree·hm-2,three forest types between Mongolia oak forest＞hybrid larch forest＞Changbai larch forest,were significantly different(P＜0.05).Porosity is basically shallow than deep,soil porosity and total noncapillary porosity average order of hybrid larch forest 2500 tree·hm-2＞hybrid larch forest 3300 tree·hm-2＞hybrid larch forest 4400 tree·hm-2＞hybrid larch forest 6600 tree·hm-2＞,were significantly different(P＜0.05).Hybrid larch forest between the different densities of soil saturated with water,capillary water retention rate and the average rate of field waterholding order hybrid larch forest 2500 tree·hm-2＞hybrid larch forest 4400 tree·hm-2＞hybrid larch forest 6600 tree·hm-2＞hybdd larch forest 3300 tree·hm-2,and saturated soil layers of different density of water-holding rate,capillary water retention rate and the rate of field water-holding difference was significant(P＜0.05).(3) In the same area,the same soil type,the hybrid larch forest of different density and different forest types between organic matter,nitrogen,hydrolysis nitrogen,total phosphorus,total available phosphorus and microorganisms in the soil have shown decreased gradually deepen and trends,and the difference was significant(P＜0.05).(4) 0～10cm soil organic matter,nitrogen,nitrogen content in the basic hydrolysis of 6,8,high performance,5,7,relatively low in September basically the same or increased slightly the roles of hybrid larch forest 3300 tree·hm-2 organic matter,nitrogen and organic matter 4400 tree·hm-2 hybrid larch forest in a declining trend,10～20cm and 20～40cm layer change,fiat with the changes of the upper basically the same.Total phosphorus content in addition to a hybrid larch forest 2500 tree·hm-2 fluctuations upward trend,the other hybrid larch forest density model with a basic diurnal decline in September recovery trend. Available phosphorus content of the hybrid larch forest density change basically the same, both in the diurnal fluctuations in the upward trend.Different forest types and density on the same soil layer between adjacent organic matter,nitrogen,hydrolysis nitrogen,total phosphorus,available phosphorus content were significantly different(P＜0.05).(5) hybrid larch forest management density between the organic matter,nitrogen, hydrolysis average nitrogen content are hybrid larch forest 4400 tree·hm-2＞hybrid larch forest 3300 tree·hm-2＞hybrid larch forest 6600 tree·hm-2＞hybrid larch forest 2500 tree·hm-2, total phosphorus Content average hybrid larch forest 3300 tree·hm-2＞hybrid larch forest 4400 tree·hm-2＞hybrid larch forest 6600 tree·hm-2＞hybrid larch forest 2500 tree·hm-2, available phosphorus content of the averagehybrid larch forest 6600 tree·hm-2＞hybrid larch forest 4400 tree·hm-2＞hybrid larch forest 3300 tree·hm-2＞hybrid larch forest2500 tree·hm-2,the same layers of different density difference was significant(P＜0.05).Three forest types of organic matter,available phosphorus content Mongolia Oak Forest highest, followed by hybrid larch forest,the forest of the Changbai larch;nitrogen,nitrogen content hydrolysis hybrid larch forest highest,followed by Mongolia oak forest,Landrace charged Xiesonglin most times total phosphorus content of the highest hybrid larch forest,followed Changbai larch forest,the oak forest,Mongolia,the same soil layer between different forest types difference was significant(P＜0.05).(6) the number of bacteria from the surface to the deep gradually reduced the number of micro-organisms and bacteria in total in a different dynamic change in the basic May to June was slow rise June to July greatly increased,from July to August basically the same, from August to September big drop in the laws of different hybrid larch forest management density difference between the number of micro-organisms,bacteria,the number of hybrid larch forest 3300 tree·hm-2＞hybrid larch forest 2500 tree·hm-2＞hybrid larch forest 4400 tree·hm-2＞hybrid larch forest 6600 tree·hm-2;fungi the number of hybrid larch forest 2500 tree·hm-2＞hybrid larch forest 4400 tree·hm-2＞hybrid larch forest 6600 tree·hm-2＞hybrid larch forest 3300 tree·hm-2;actinomycosis number of hybrid larch forest 4400 tree·hm-2＞hybrid larch forest 3300 tree·hm-2＞hybrid larch forest 2500 tree·hm-2＞deciduous hybrid 6600 tree·hm-2 pine trees. (7) hybrid larch forest 2500 tree·hm-2bacteria,fungi,actinomycetes and organic matter, nitrogen,hydrolysis nitrogen,total phosphorus,available phosphorus and have shown very significant positive correlation.hybrid larch forest 3300 tree·hm-2bacteria,actinomycetes and organic matter,nitrogen,hydrolysis nitrogen,total phosphorus,available phosphorus between a significantly positive correlation,but with the exception of available phosphorus fungi were significantly positively correlated,and other fertility factor correlation between not significant,hybrid larch forest 4400 tree·hm-2 fungi and actinomycetes,available phosphorus,total phosphorus were significantly positive correlation between the other factors of soil fertility showed a significant positive correlation.Hybrid larch forest 6600 tree·hm-2 actinomycetes and other correlation between fertility factor is not significant,the other showed a significant positive correlation.(8) The results of this study,density in the four kinds of business models,hybrid larch forest 6600 tree·hm-2 worst,the density of other models in average physical performance, chemical hybrid larch forest 3300 tree·hm-2,hybrid larch forest 4400 tree·hm-2 better performance,Micro-organisms in hybrid larch forest 2500 tree·hm-2,hybrid larch forest 3300 tree·hm-2 better performance.As can continue to follow-up study,the more the master of different density hybrid larch plantation for the impact of soil fertility,to obtain relatively good Larch configuration.
|
PDF Full Text Request