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Nutritional Cycling and Transformation Processes of Carbon and Nitrogen in Rice Cropping System of Red Soil Region of China

Author: ZhouWeiJun
Tutor: ZhangGuangYuanï¼›WangKaiRong
School: Huazhong Agricultural University
Course: Soil
Keywords: Rice system in red Organic materials cycling C, N cycling and transformation
CLC: S158
Type: PhD thesis
Year: 2003
Downloads: 561
Quote: 2
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Abstract


The Nutrient Cycling is the most basic functions of the ecosystem. The amount of farmland ecosystem nutrient cycling are the main features of the metabolic function of the signage system. Soil organic matter is the most important factor affecting the productivity of land. The Soil Nitrogen is the most important nutrient supply for crop growth. Rice is the main cultivated crops of red soil hilly region of southern China, red paddy soil nutrient cycle characteristics and nutrient cycling increase the role and contribution in China's grain production, and nutrient cycling within the system management measures on soil C, N cycle and the transformation process is to establish the virtuous circle of red paddy system nutrients, reasonably effective use of resources, regulation of soil C and N balance basis. Agro-ecological experiment station in Taoyuan, Chinese Academy of Sciences and long-term positioning test - the impact of different fertilization system on red paddy system productivity and Soil Environmental rely on, through 12 years of different fertilization system, soil nutrients, crop yields, and C, N cycle and systematic analysis of the transformation process, revealing red paddy soil nutrient cycling characteristics; clarify the the fertilization system changes its increasing effect on nutrient cycling and contribution to China's grain production; proven red paddy system soil C and N cycle and transformation process. On the basis of the above test data, a simulation model of the rice system in red soil organic C cycle and transformation. The results show that: red paddy systems rely on a system of organic materials recycling Promotion System C, N cycle, improve soil organic matter content and improve the quality of soil organic matter, enhance soil C and N library activity accelerated nutrient cycle turnover, improve system productivity. The specific results are as follows: 1. Rice system in red due to harvesting rice with NPK nutrients very N between 88.2 ~ 231.0kg/hm ~ 2, the average changes in the P 21.5 ~ 55.7kg/hm ~ 2 for 172.6kg/hm to 2; between the average for 38.3kg/hm to 2; K between 105.6 ~ 282.2kg/hm ~ 2 change average for 184.6kg/hm. By rice straw output of NPK nutrients were 61.9kg/hm ~ 2,11.8 kg / hm ~ 2,162.0 kg / hm ~ 2, accounted for 35.9% of the amount of nutrients rice harvest output, 30.8% and 87.8%, respectively. 2. Red paddy soil organic materials recycling can be the return of most of the soil nutrients NPK restitution, respectively 127.6kg/hm ~ 2,40.4 kg / hm ~ 2 and 262.6kg/hm ~ 2, respectively, of the system due to the rice harvest with the N, P, K 55.2%, 72.5% and 93.0%. Single chemical fertilizer (N 230kg/hm ~ 2, the P 40kg/hm ~ K162kg/hm to 2) red soil paddy fields Nutrient showed deficit state recycling of organic materials is conducive to promoting the nutrient balance of the system, only in NPK take organic materials recycling based on fertilizer, NPK nutrients showed a surplus before. 3. The fertilization regime change, making the level of productivity of the rice system in red occur three times a big leap, each leap about to improve the productivity of more than 15% of. Recycling of organic materials within the system (C) than long-term productivity of fertilizer (CK) levels increased by 56.8%, is the reform in the history of mankind the fertilizing system (or agriculture management system) stage of development of the productivity of the first leap. Agricultural system of production level than the long-term fertilization NPK combined fertilizer system increased by 62.5%, the second leap in the level of productivity achieved with the raising the level of agricultural chemical. NPK C Huazhong Agricultural University, 2002 Zhou Weijun the Doctoral Dissertation organic inorganic fertilizer and system increased by 80.1% than the long-term fertilization level of productivity, is maintaining organic materials recycling within the agricultural system based on the chemical NPK turn into the agricultural system, level of productivity achieved third leap. Fertilizer application, the red soil paddy rice production increased by 62.5% or rice yield through fertilization fertilizer application's share of contributions to a share of 38.4%. Organic inorganic complexes rice production increased by 80.1%, or yield reached through fertilization, organic inorganic complexes share of contribution to a share of 44.4%. 4. The red paddy organic materials natural return of the amount of up to 6162 kg claw m \increase between 0 3.05 A pair of g red paddy systems can be artificially restitution organics Feeds up up to 13480 kg/hn12, the average 10761k young unZ, organic materials recycling help to promote a balance of organic carbon and soil organic matter the accumulation of soil organic matter increase between 6.30 7.58 pair g, the growth rate of 26.7 to 32.1%. 5 red paddy soil organic materials recycled easily oxidized soil organic matter increase between 4.41 to 6.60 kg creator, growth rate reached 54.53% 36.47; oxidation stability reduces soil organic matter, oxidation stability factor (Kos) reduce the rate of 14.57 to 30.87%; increase between 3.86 to 4.68 A pair of g of soil humus, the growth rate reached 38.04% 31.34 single application of fertilizer rice system in red soil humic acid increase in 2.43 ~ 3.06g/kg, fulvic acids increase between 1.43 an 1.63 g / kg the Hu / rich ratio increased by 12.75 to 18.14 percent. 6. The net increase in the total nitrogen from 0.05 to 0.41 A pair of g, the net increase in the amount of hydrolysis of nitrogen in a 11.2m n.3 Vision g; organic materials recycling the amount of the net increase in total soil nitrogen 0.44 0.87 pair g, the growth rate reached 62.61% 61.50 net increase in the amount of hydrolysis nitrogen in the between 22.3 a the 29.3mg melon g, the growth rate of 13,6 17.8%. 7. organic materials recycling can increase the accumulation of different rice growth stages of soil available nitrogen content and rice to absorb nitrogen; can improve soil nitrogen mineralization potential difficulties 0), its growth rate from 44.13 to 89.85%, and has obvious seasonal differences to rice The results showed that of the post-harvest (November 5), the highest, the early rice maturity lowest (July 5) 8.SCNC soil organic matter model suitable for modeling and prediction of red paddy soil organic matter. predicted 50 years of soil organic matter cycle and transformation recycling of organic materials increase soil organic carbon between 13.8 a 46.7 t / lllnZ, the growth rate of 41.5 to 140.7%, while applying chemical fertilizers rely solely on the return of natural organic materials, soil organic carbon show a downward trend or basic maintenance Balancing rocks

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