|
Carbon cycle is one of the focus of attention of environmental scientists before, carbon cycle research is essential to global climate change and the carbon cycle carbon storage and carbon flux in recent years, large-scale carbon balance has been widely used to analyze carbon position of countries and regions, biomes and economic zones, especially in terrestrial ecosystems, forests and soil carbon cycle is the focus of attention of ecologists of the world, but also various regions of agroforestry carbon cycle carbon balance Few reports, agroforestry systems in the Huang-Huai-Hai Plain, will be divided into trees, crops, soil three subsystems, studied forest carbon storage, intercropping crops, carbon sequestration and soil carbon pool size, for the development of Agroforestry effective, sustainable land use patterns to provide support, more regional and global carbon cycle research provide theoretical support with some basic research data. Agricultural areas of the Huang-Huai-Hai Plain poplar-crop intercropping system for the specific object of study, the use of standard regression methods were investigating the Huang-Huai-Hai Plain 3 years, 5 years, 9 years, 11 years, 13 years, 17 years poplar - crop intercropping like to poplar and crop biomass, and take all kinds of soil samples, analysis of the determination of their carbon content to estimate the carbon storage of poplar-crop intercropping system, specific findings are as follows: (1) the Huang-Huai-Hai Plain poplar-crop intercropping system biomass investigate the Huang-Huai-Hai Plain of 3 years, 5 years, 9 years, 11 years, 13 years, with 17 years poplar-crop intercropping system poplar biomass for 12.71,16.35,90.49,92.82,127.82,162 t / ha 2 , each organ biomass allocation both showed: dry gt; sticks GT; root gt; Rule of leaf and stem, branches, leaves and total biomass with stand age reached a significant positive correlation between (P lt; 0.01), root biomass and forest age was a significant positive correlation relationship between P lt; 0.05) The six plots crop (summer and autumn crops) biomass 17.49,15.95,15.36,14.35,13.55,12.77 T / hm 2 , with increasing years of intercropping, crop biomass decreased gradually with stand age, the threat to the obvious effect, the analysis shows, was a significant negative correlation between crop biomass and intercropping life. Six samples of litter biomass for 0.68,0.97,2.14,4.82,6.00,7.06 t / hm 2 · a 11,13,17 intercropping system has a higher litter biological amount. (2) the Huang-Huai-Hai Plain poplar-crop intercropping system poplar organ carbon determination poplar carbon content of dry 0.4527, branches 0.4574, Ye 0.4482, root 0.4587, skin 0.4364, the coefficient of variation of the carbon content between the organs only 2%, the average carbon content was 0.4507, the average carbon content of the litter was 0.4359, the carbon content of the organs of the root, the smallest and the carbon content of the skin. (3) Huang-Huai-Hai Plain poplar-crop intercropping system of soil organic carbon determination of the Huang-Huai-Hai Plain 3 years, 5 years, 9 years, 11 years, 13 years, 17 years poplar-crop intercropping system to 60cm average soil organic carbon content 0.493%, 0.517%, 0.562%, 0.608%, 0.638%, 0.651%, a single irrigation and control carbon content of 0.203% from 2.43 to 3.2 times the vertical distribution showed decreased with increasing soil depth trends in different soil carbon content twenty-two differences were very significant level (P lt; 0.01), and with the increase of soil depth, this difference gradually decreases. (4) the Huang-Huai-Hai Plain poplar-crop intercropping system carbon storage analysis and estimate of the Huang-Huai-Hai Plain 3 years, 5 years, 9 years, 11 years, 13 years, 17 years poplar-crop intercropping system of soil carbon storage were 40.97, 45.55,51.06,55.94,60.49,63.83 t / hm 2 , Soil carbon storage and carbon content the same as the soil depth is reduced, carbon storage is mainly concentrated in the 0 ~ 40cm, accounting for from 77.6% to 83.5% of the same age intercropping storage, soil carbon storage growth with forest age increases, and the two reached a significant level of positive correlation (P lt; 0.01), the same soil layer increased with the years of intercropping, carbon storage is also showing a growing trend, and they reached a very significant positive correlation (P lt; 0.01). Six forest age intercropping Poplar Stands carbon storage for 6.09,7.86,42.07,44.11,60.71,76.69 t / hm 2 , forest age stage, carbon storage trunk, followed by branches, roots, leaves and litter carbon storage is small. Dry skin carbon storage in the proportion of the total stand carbon storage with increasing forest age increased share of the total storage in the proportion of 35% to 57.9%, branches, leaves carbon storage with with stand age and a downward trend. Total carbon storage of various forest belt and intercropping age was a significant positive correlation (P lt; 0.01), in addition to root carbon storage and intercropping years showed a significant positive correlation (P lt; 0.05), the other component of the carbon storage and intercropping life was a significant positive correlation (P lt; 0.01). Annual crop carbon storage, respectively 7.92,7.40,6.96,6.51,6.14,5.79 t / hm 2 , the average annual absorption the CO 2 6.8 t / hm 2 annual carbon storage of wheat from 35.5% to 38.2% of the total carbon storage, peanut annual carbon storage total storage capacity of 61.8% to 64.5%, summer crop wheat in carbon storage is lower than the autumn crop peanut annual carbon storage, below its average of 38.6%, peanuts have a high carbon sequestration capacity. (5) the Huang-Huai-Hai Plain poplar-crop intercropping system Carbon Storage and Distribution of six forest age intercropping system total carbon storage 54.98,60.81,100.09,106.76,127.34,146.31 t / hm 2 , of all ages poplar and soil carbon storage are the largest of its total storage capacity of 85.1% to 93.9%, and poplar, soil, crops, litter four subsystems each intercropping system 33% of the total storage , 57%, 8%, 2%, soil carbon storage accounted for the largest percentage, followed by poplar crops, minimum litter only 2%, the proportion of soil carbon storage is 1.73 times the storage of poplar, vegetation and The soil is the two most important carbon stocks of terrestrial ecosystems. Analysis, the Huang-Huai-Hai Plain carbon storage of poplar-crop intercropping system was significantly higher than the farmland ecosystem carbon storage, compared with the different types of forest ecosystem carbon storage, but also has the advantage of higher poplar-crop intercropping system has high carbon storage potential.
|