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Dołączył: 29 Paź 2010
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 Wysłany: Nie 7:15, 13 Lut 2011 Temat postu: uggs outlet rotterdam Sanjiangyuan different commu |
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Grassland degradation Sanjiangyuan different changes in community structure
In addition to plots 2, outside the heavily degraded grassland. Same as in the same degradation as the soil moisture content in the depth of the soil. Soil moisture content decreased. This is because the soil texture and structure with the depth of the soil water retention getting worse 2.5 grassland degradation in different parts of changes in soil nutrients in different parts of Table 5, degraded soil moisture distribution at different depths of soil moisture,% degradation plots: -== can be seen from Table 6. Degraded grassland with different soil organic matter, total nitrogen, nitrogen content decreased from the surface down, between different degradation increased with the degree of degradation. Organic matter, total nitrogen content decreased with soil total nitrogen content is closely related with soil organic matter content. The higher organic matter content. Total nitrogen content is higher. The same degree of grassland degradation, soil depth, with the plot than 2 severe, extreme external total phosphorus in degraded grassland have decreased in the same area of grassland degradation in different total phosphorus content did not change. Note the different degradation of vegetation on soil total P was relatively small. Soil total potassium,[link widoczny dla zalogowanych], available phosphorus, potassium, total salt, calcium carbonate content and pH value of the distribution in the soil and the different levels showed no significant change in degradation, suggesting that the different degradation of vegetation on soil total potassium, available phosphorus, available potassium,[link widoczny dla zalogowanych], total salt,[link widoczny dla zalogowanych], calcium carbonate content and pH value had little effect. Different degraded grassland surface soil available phosphorus content than 1 plot outside the heavily degraded grassland are higher. This contaminated soil by livestock manure on soil pH, generally performed slightly alkaline. 3 discuss the original vegetation of degraded grassland restoration succession,[link widoczny dla zalogowanych], dealing with different first nine Jing et al: Three Rivers regions of different structural characteristics of grassland degradation changes in 2129 Grassland degradation control measures can be taken to different grazing prohibition, retired grazing grass, poisonous weeds Control in miscellaneous, rodent control and the establishment of natural protected areas ��8 '] measures the relative light weight and extremely degraded degraded grassland restoration and improvement of the speed of the type, time and financial resources must be less [10. Il; Also, determine a reasonable carrying capacity, control of grazing intensity. The implementation of rotational grazing and other measures to protect the non-degraded grassland is an effective measure relative alpine meadow alpine steppe vegetation composition, community structure and ecological conditions such as soil conditions even worse, it more difficult to control the degree of grassland degradation, soil organic matter, greater impact on total nitrogen. For the serious degradation, poor soil fertility should be fertilizing the grass. And artificial seeding. Through the comprehensive management of different degraded grassland. In a longer period of time gradually increase the vegetation coverage. To water conservation, stormwater interception, reducing soil erosion; reduce surface wind speed, reduce soil erosion; reduce evaporation of soil moisture,[link widoczny dla zalogowanych], inhibit the invasion of rodents, is conducive to the recovery of native vegetation. In short, the rational use of grassland resources in order to promote the sustainable development of grassland. Improve the grassland ecosystem function of internal self-regulation to ensure the sustainable development of livestock production.
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