Effects Of Formation Carbon Sequestration Under Vegetable Fields On Agricultural Measures

Agriculture is an important source of greenhouse gas, China's agricultural cropland area is large, small change of carbon sequestration in farmland ecosystem would impact CO₂ concentration in atmospheric. At present, question of carbon balance in agricultural system increasing proves to be a hot and frontier topic in ecological science, what's more, agricultural managements determined whether carbon function of current agricultural ecosystems were sink or resource. Most of the studies suggested that organic carbon losses is due to inefficient agricultural production, frequent tillage, unreasonable fertilization, and burning of crop residues. Therefore, improving agricultural measures can reduce the decomposition of soil organic carbon, which is also effective measures to reduce the emissions of CO₂ in plough layer. The main results were indicated as follows:â‘ Effects on soil physical and chemical propertiesThe treatment of intercropping increased the content of soil organic matter, available N, and available K. Tillage treatment reduced the content of soil bulk density, increased porosity of soil, but also resulted in the loss of Soil available nutrient; Fallow treatment enhanced the content of soil organic matter and soil available nutrient. Content of soil available nutrient after application of organic fertilizer decomposed by selective microbial flora(H) was higher than application of composted pig manures (M) and dry pig dung (L).â‘¡Effects on soil organic carbon Compared to maize sole cropping(V-CK), plant biomass on intercropping sequences of maize and Phaseolus vulgaris var. humilis Alef. (V-T1) and intercropping patterns of maize and Phaseolus vulgaris Linn (V-T2) was increased, content of soil organic carbon increased by 20.38%,27.74%, respectively. The growth rate of soil organic C under cropping intercropping pattern of Brassica Oleracea with Cherry Radish(L-T1,L-T2) increased by 24%,9%, respectively, compared to those in Brassica Oleracea sole cropping. Content on SOC in cropping pattern of Phaseolus vulgaris Linn- fallow-Chinese cabbage(TR1) was significantly increased by 25.43% than that in cropping pattern of Phaseolus vulgaris Linn-fallow(CK). Content of SOC in H and M were significantly advanced by 14.06%,5.28%, respectively.â‘¢Effects on soil enzymatic activityIntercropping patterns and fallow treatments enhanced the activity of catalase enzymes , urease enzymes, phosphatase enzymes, invertase enzymes. Soil enzymatic activity of H was lower than L, activity of catalase enzymes in M was higher than L, activity of phosphatase enzymes and urease enzymes was lower.â‘£Effects on contents of carbon fixed by plant and accumulation of soil organic carbonEffects on contents of carbon fixed by plant. In a word, intercropping, fallowing and application organic fertilizers could promote plant growth, improve biomass, so content of carbon fixed by plant was enhanced. Carbon sequestration in V-T1 and V-T2 was significantly increased by 26.19%,29.56%, compared to V-CK. Total carbon fixed by plant of H was 3166.92g, which was significantly higher than L and M.Effects on soil organic carbon storage and accumulation of soil organic C. storage and accumulation of soil organic carbon in V-T1 was significantly increased by 12.14%, compared to V-CK, while there was on significant difference between V-T2 and V-CK. Storage of soil organic C of L-T1,L-T2 was increased by 29.19%,14.69%, while accumulation was enhanced by 62.10%,30.84%, respectively. Compared with pre-test, content of soil organic C in CK,TR1,TR2 was increased by 23.22%,72.85%,-4.44%, respectively. Increasing rate in H and M was 18.01%,20.23%...