| Forest carbon sink is playing an extremely important part in slowing global warming. Artificial management measures can significantly affect forest carbon sink function. As one of the most important management measures, fertilization is used widely in the forestry production. Fertilization has a close relationship with soil organic carbon content and the changes of enzyme activity. D.farinosus(Keng et Keng f.)Chia et H.L.Fung is an important economic bamboo forest; its planting area increases year by year, and it is the huge potential carbon sink. This thesis studies the effects of fertilization on organic carbon and enzyme activities and the correlation between them of the D.farinosus(Keng et Keng f.)Chia et H.L.Fung Soil. This studies set no fertilization controls. The results of the study shows:(1)The soil organic carbon content under four fertilization treatments can be ranked as:row replacement compound fertilizer> broadcasting organic biobaterial manure> row replacement organic biobaterial manure> broadcasting compound fertilizer, and the content is between5.16±1.45gC·kg-1and7.18±0.98gC·kg-1, which is increased17.4%to39.1%. Fertilization kind has a highly notable of difference with the SOC (p<0.01), F=6.15>F0.05(1.6).Fertilization way has no significant difference with the SOC. F=5.72<F0.05(1.6).The interaction of fertilization kind and way has a notable of difference with the SOC (p<0.05), F interaction>F Fertilization kind Thus, short-term fertilization can advance soil organic carbon content of D.farinosus(Keng et Keng f)Chia et H.L.Fung; appropriate manure matching in a reasonable way can express better forest soil carbon fixation.(2)The soil microbial biomass carbon content under four fertilization treatments can be ranked as:row replacement organic biobaterial manure> broadcasting compound fertilizer> broadcasting organic biobaterial manure> row replacement compound fertilizer, increasing137.1%,119.3%,101.0%and67.9%respectively in compared with the control(p<0.05). There is no significant difference between treatments. Fertilization kind has a significant notable of difference with the S-MBC (p<0.01), Fertilization way has highly notable of difference with the SOC. F=23.62> F0.01(1.6)、F=10.51> F0.05(1.6), The interaction of fertilization kind and way has a significant notable of difference with the S-MBC (p<0.05), F=38.91> F0.0,(1.6), F interaction>F Fertilization kind. The study shows: short-term fertilization can significantly advance soil microbial biomass carbon content of D.farinosus(Keng et Keng f.)Chia et H.L.Fung, but fertilization type and fertilization way have no appreciable impact on it.(3)The soil urease activity under four fertilization treatments can be ranked as: broadcasting organic biobaterial manure> row replacement organic biobaterial manure> broadcasting compound fertilizer> row replacement compound fertilizer, increasing35.1%to62.6%than the control group. The invertase activity can be ranked as: broadcasting compound fertilizer> broadcasting organic biobaterial manure> row replacement organic biobaterial manure> row replacement compound fertilizer, increasing considerably158.0%to343.0%than the control group. The alkaline phosphatase activity under four fertilization treatments can be ranked as:row replacement organic biobaterial manure> row replacement compound fertilizer> broadcasting organic biobaterial manure> broadcasting compound fertilizer, increasing56.1%to131.7%than the control group. The catalase activity under four fertilization treatments can be ranked as:broadcasting compound fertilizer> row replacement compound fertilizer> row replacement organic biobaterial manure> broadcasting organic biobaterial manure; the activities are between0.69±0.06umol·g-1·h-1and0.82±0.08umol·g-1·h-1, they are all higher than that of control. Fertilization kind has a highly notable of difference with soil urease and invertase activities (p<0.01), which has notable of difference with soil alkaline phosphatase activities (p<0.05). Fertilization way has a notable of difference with soil invertase activities (p<0.05), that has no significant difference with soil urease and alkaline phosphatase activities. The interaction of fertilization kind and way has a notable of difference with soil urease and invertase activities (p<0.05), which has no significant difference with soil alkaline phosphatase activities. Fertilization kind and way and the interaction of both has no significant difference with soil catalase activities. The study shows that:fertilization can have positive function to soil enzymatic activity; fertilization kind has significant influences on it; the influences from fertilization way are relatively small, but fertilization kind match up with proper fertilization way can promote the influence level, and then advance soil fertility.(4)The soil organic carbon content has significant correlation with the activities of soil urease, invertase and alkaline phosphatase of the blank control and four fertilization treatments (p<0.05); it has notable correlation with catalase activity of control group, row replacement compound fertilizer and broadcasting organic biobaterial manure treatments (p<0.05); it has no notable correlation with catalase activity under broadcasting compound fertilizer and row replacement organic biobaterial manure treatments. The soil microbial biomass carbon content has significant correlation with the activities of soil urease, invertase and alkaline phosphatase under the blank control and four fertilization treatments (p<0.05); it has no notable correlation with catalase activity under the control group; it has significant correlation with catalase activity under our fertilization treatments (p<0.05). Studies show the correlation between soil organic carbon content and the activities of soil urease, invertase and alkaline phosphatase have not changed through fertilization; the soil microbial biomass carbon content is also the same situation, so they can represent the soil nutrient supply level and fertility changes of the D.farinosus(Keng et Keng f.)Chia et H.L.Fung plantation. |
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