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- Title
An evaluation of net carbon sink effect and cost/benefits of a rice-rape rotation ecosystem under long-term fertilization from Tai Lake region of China.
- Authors
Li Jie-Jing; Pan Gen-Xing; Zhang Xu-Hui; Fei Qing-Hua; Li Zhi-Peng; Zhou Ping; Zheng Ju-Feng; Qiu Duo-Sheng
- Abstract
Taking a long-term fertilized rice-rape rotation system in Taihu Lake as test objective, its annual C balance and economic benefit were estimated, based on the measurement of past years grain yield, litter C content, and field CO2 emission as well as the investigation of material and management inputs. The calculated annual C sink under different fertilizations ranged from 0.9 t C · hm-2 · a-1 to 7.5 t C · hm-2 · a-1, and the net C sink effect under combined inorganic/organic fertilization was three folds as that under chemical fertilization. The C cost of material input ranged from 0.37 t C · hm-2 · a-1 to 1.13 t C · hm-2 · a-1, and that of management input ranged from 1.69 t C · hm-2 · a-1 to 1.83 t C · hm-2 · a-1. The annual economic benefit ranged from 5.8 · 10(3) CNY · hm-2 · a-1 to 16.5 · 103 CNY · hm-2 · a-1, and was 2.1 times higher under combined fertilization than under chemical fertilization. Comparing with that under chemical fertilization, the marginal cost for per ton C sink under combined inorganic/organic fertilization was estimated as 217.1 CNY · t-1 C, very close to the C price of 20 Euro · t-1 C in the EU. In sum, under combined inorganic/organic fertilization, this rice paddy ecosystem could not only have higher productivity, but also present greater net C sink effect and higher economic benefit, compared with under chemical fertilizer fertilization.
- Subjects
PLANT fertilization; RICE processing; CROP rotation; GRAIN; CROP yields; ORGANIC compounds &; the environment; INORGANIC compounds -- Environmental aspects; FERTILIZER application; DIRECT costing
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2009, Vol 20, Issue 7, p1664
- ISSN
1001-9332
- Publication type
Article