常綠闊葉林改造為毛竹林對土壤呼吸組分與活性碳庫的影響
[Abstract]:The change of land use change significantly affects soil carbon storage and soil respiration. The transformation of natural forest to artificial forest has brought about higher economic benefits. As a result of the change of the nature of vegetation and management mode, the species composition, litter characteristics, soil physicochemical and biological properties of the community also changed radically, which significantly affected the soil. The dynamic characteristics of carbon storage, bamboo is an important artificial forest resource in the south of China, accounting for about 70% of the area of bamboo forest in the country, and plays an important role in the carbon balance in the subtropical region. In recent years, in order to improve the economic benefits, many forest reforers have transformed the natural evergreen broad-leaved forest into Mao Zhulin, and used chemical fertilizer to increase the number of ploughing and to increase the number of ploughing and to increase the number of ploughing and to increase the number of ploughing. In addition to the intensive management measures such as weeds under forest, the change of land use and the implementation of related management measures will significantly affect the soil carbon process. However, the mechanism of its influence is still lacking in deep systematic study. The project is based on the natural evergreen broad-leaved forest and the reconstructed bamboo man Industrial forest, through a 1 year positioning test. The dynamic changes of the two kinds of forest soil respiration components (including soil total respiration, autotrophic respiration and heterotrophic respiration) and environmental factors (including soil temperature, soil water content, water soluble organic carbon content and microbial biomass content) were studied, and the transformation of evergreen broad-leaved forest to Mao Zhulin's soil respiration component and active carbon pool was explored. The relationship between soil respiration components and environmental impact factors was analyzed. The main results were as follows: (1) the soil respiration of evergreen broad-leaved forest and Phyllostachys pubescens plantation, autotrophic respiration and heterotrophic respiration showed significant seasonal variation. The maximum value of total soil respiration rate of two woodlands appeared in summer, The minimum value occurred in winter. The respiration rate of two woodland soils was the highest in summer and lowest in winter, while heterotrophic respiration was the highest in autumn and lowest in winter. (2) the annual cumulative CO2 emission of soil respiration in evergreen broad-leaved forest and bamboo forest was 31.60 and 37.25 t CO2hm-2 yr-1. evergreen broad-leaved forest soil total respiration rate, heterotrophic respiration rate, autotrophic respiration The annual mean absorption rate is 2.48,1.57 and 0.91 mol CO2 m-2 s-1, and the annual average soil respiration rate, heterotrophic respiration rate and autotrophic respiration rate of the bamboo forest are 2.93,1.92 and 1.01 Mu mol CO2 m-2 s-1. two, respectively, which show the proportion of heterotrophic respiration in soil respiration. The soil heterotrophic respiration accounted for 63.57% and 66.07% of the total soil respiration, and the proportion of the autotrophic respiration was 36.43% and the 33.93%. evergreen broad-leaved forest was transformed into the bamboo forest. The total soil respiration, heterotrophic respiration and autotrophic respiration increased by 17.87%, 22.51% and 9.78%. (3) evergreen broad-leaved forest and the water soluble organic carbon in the soil of 9.78%. (3). The content of (WSOC) and microbial biomass carbon (MBC) had obvious seasonal variation. The minimum value of WSOC content in evergreen broad-leaved forest and Mao Zhulin soil appeared in February, the highest value appeared in June. The soil MBC content of evergreen broad-leaved forest was higher in summer and autumn and lower in winter; the MBC content in soil of bamboo forest was higher in 10-12 month, lower in 7-8 months, the lowest value was out. In February, after the transformation of evergreen broad-leaved forest into bamboo forest, soil WSOC content increased by 10.26%, while soil MBC content decreased by 6.23%. (4) evergreen broad-leaved forest and Phyllostachys pubescens soil respiration each component was significantly correlated with soil temperature (5 cm) (P0.01). Evergreen broad-leaved forest and bamboo forest soil total respiration, heterotrophic respiration, autotrophic respiration The temperature sensitivity coefficient (Q10) of absorption rate was higher in 1.80,1.92,1.70 and 2.05,1.95,2.34. evergreen broad-leaved forests, while the sensitivity of autotrophic respiration to temperature was the highest. (5) the total respiration of soil in evergreen broad-leaved forest, heterotrophic respiration and soil WSOC content were significantly correlated (P0.01), and the bamboo forest soil was very significant (P0.01). There was significant correlation between soil total respiration, heterotrophic respiration and soil WSOC content (P0.05). There was no significant correlation between the autotrophic respiration of two woodland soils and the content of soil WSOC. There was no significant correlation between the two soil respiration components and the soil water content and the soil MBC content.
【學(xué)位授予單位】:浙江農(nóng)林大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:S714
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